Re: Parsing problem
Ely == Ely Eshel [EMAIL PROTECTED] writes: Ely Hi! Ely I've just started using JSTL, and encountered a problem with the c.tld. I Ely get the following error: Ely org.apache.jasper.JasperException: XML parsing error on file Ely /WEB-INF/tlds/c.tld: (line 3, col 8): Document is invalid: no grammar Ely found. Ely I use the c.tld from the standard 1.1 distribution on Tomcat 4.1.27 and JDK Ely 1.4.2_01 on Windows XP. Ely The opening lines of the c.tld are as follows: Ely ?xml version=1.0 encoding=UTF-8 ? Ely taglib xmlns=http://java.sun.com/xml/ns/j2ee; Ely xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance; The 1.1 version of the JSTL doesn't work with Tomcat 4.x. use the 1.x version of the JSTL. -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] ; SCJP; SCWCD; SCBCD - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: can't reference a class file (field) with el?
Solomon == Solomon Gorlick [EMAIL PROTECTED] writes: Solomon Hi, Solomon I was trying to use the value of a Java-class' static final field as part of Solomon an EL-based value, but it didn't work. Is this a wierd thing to want (I was Solomon trying to standardize a certain fmt:formatNumber pattern for multiple uses)? Solomon Is it supported and I just have the syntax wrong? (I traced part of the Solomon code into JSTLVariableResolver.resolveVariable() which appears not to handle Solomon this case.) It works fine if I hard code the format, or if I reference the Solomon static field using the RT version of the tag. Here is some sample code: Solomon Any thoughts? Yes. You should read the JSTL specification. It is not a dry unreadable document. It says exactly what you can do with it. It makes it clear you can't do this. Search the archives of this list for numerous discussions about this very point. -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] ; SCJP; SCWCD - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Going nuts with JSTL tag lib installation
Karsten == Karsten Wutzke [EMAIL PROTECTED] writes: Karsten I get the following exception: Karsten HTTP Status 500 - Karsten type Exception report Karsten message Karsten description The server encountered an internal error () that prevented it from Karsten fulfilling this request. Karsten exception Karsten org.apache.jasper.JasperException: This absolute uri Karsten (http://java.sun.com/jstl/core) cannot be resolved in either web.xml or the jar Karsten files deployed with this application I would search in the archives for this, but it appears to be down right now. Try opening up the jstl.jar file and inspecting the TLD file in the META-INF directory. That should specify the URI it expects. -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] ; SCJP; SCWCD - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Any logic:notPresent equivalent tag(s) in JSTL
Vernon == Vernon [EMAIL PROTECTED] writes:
Vernon I am forced to use the Struts Tiles without Struts due to a tag pooling
problem of template tag set ( from a JSP book). To
Vernon avoid the definition objects are recreated each time the definition file
is included, and drain performance. It is better to
Vernon have something like the Struts logic:notPresent tag. Is something
equivalent in JSTL?
The following has close to the same semantics:
c:if test=${empty expr}
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Re: JSTL okay with get method, but no set method?
Wendy == Wendy Smoak [EMAIL PROTECTED] writes:
Wendy I have a DTO that contains a List of objects. Since you can add any Object
Wendy to a List, I would rather not have a
Wendy setAssistants( List asst );
Wendy method that would allow someone to add a list of inappropriate object types.
Wendy Instead, I want to only have:
Wendy public List getAssistants();
Wendy public void addAssistant( PersonView p);
Wendy I know that having two 'set' methods with the same name but different
Wendy parameters *really* confuses the introspection/reflection/whatever magic
Wendy happens with JavaBeans. Learned that one the hard way. :(
Wendy But what about a 'missing' set method? It _seems_ to be working:
Wendy c:forEach items=${trackDto.assistants} var=asst
Wendy c:out value=${asst.assistant.preferredName}/ c:out
Wendy value=${asst.assistedDate}/
Wendy /c:forEach
Wendy I gather that JSTL uses the 'get' method to determine the type of the
Wendy object, because I'm not specifying that here and it's having no problems.
Wendy Please stop me now if I'm doing something that's going to cause problems
Wendy later!
From a non-authoritative point of view, I can't see how that could be a
problem. You could sort of verify this yourself, by writing some code using
Introspector and BeanInfo. If you get the PropertyDescriptors for the class
and you find that the assistants property has a read method but a null write
method, and it did all this without bombing, then the EL will probably be fine
with it.
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Tag libraries that use ExpressionEvaluator depend on Jakarta implementation
This is probably obvious, but it is the case that any tag libraries that use the ExpressionEvaluator class in the Jakarta JSTL implementation are actually dependent on the Jakarta implementation, as opposed to the specification, correct? Since only the JSP api is described in the specification, and not the Java api, then another JSTL implementation could use a completely different class. I'm not complaining, I just want to make sure I'm clear on that point. -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] ; SCJP; SCWCD - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: c:out
Sloan == Sloan Seaman [EMAIL PROTECTED] writes:
Sloan I have a variable in the session named:
Sloan com.symbol.mobilecommerce.analysis.SESSION_USER
Sloan I want to get the object via c:out and use it in a JSP page.
Sloan When I have the variable just named SESSION_USER it works fine.
Sloan Example (note core:out = c:out)
Sloan Greetings
Sloan core:out value=${sessionScope.SESSION_USER.firstName}/
Sloan core:out value=${sessionScope.SESSION_USER.lastName}/.
Sloan But if I try:
Sloan Greetings
Sloan core:out
Sloan value=${sessionScope.com.symbol.mobilecommerce.analysis.SESSION_USER.firstN
Sloan ame}/
Sloan core:out
Sloan value=${sessionScope.com.symbol.mobilecommerce.analysis.SESSION_USER.lastNa
Sloan me}/.
Sloan It doesn't work.
Sloan I know this is because c:out is trying to call the object com and then the
Sloan getter symbol and so on.
Sloan How do I get around this so that it works?
Try:
value='${sessionScope[com.symbol.mobilecommerce.analysis.SESSION_USER].firstName}'
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Re: EL case sensitivity
John == John Thorhauer [EMAIL PROTECTED] writes:
John When using JSTL and the Expression Language with a bean, how does the
John api handle upper/lower case. For example, I have an class with a
John getPONumber() method. Now if i want call that in the Expression
John Language how is it properly done:
John ${myobj.ponumber}
John ${myobj.pONumber}
John ${myobj.PONumber}
John I am trying to figure out how this works so I can standardize my calls.
I always avoid having the second letter capitalized. It just gets confusing
otherwise.
I think the correct property name would be poNumber, but you could either
examine the JavaBeans specification, or perhaps write some testing code using
the Introspector class, to get the answer from the horse's mouth.
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Re: forEach Problem
Alejandra == Alejandra De Leon [EMAIL PROTECTED] writes:
Alejandra I'm having a problem with foreach tag using begin and end attributes.
Alejandra The code I have is:
Alejandra c:forEach begin=${erliestYear} end=${latestYear}
varStatus=status
Alejandra option value=c:out value='${status.index}'/c:if
Alejandra test=${status.index == statisticsForm.toYear}c:out value=
Alejandra selected//c:ifc:out value='${status.index}'//option
Alejandra /c:forEach
Alejandra and when earliestYear it's equals to lastYear It doesn't display the
option
Alejandra tag.
Alejandra I suppose that it should be like in Java that runs the loop once.
Alejandra This is a bug or it's not possible to use a foreach only to run once.
Just make end equal to ${latestYear + 1}.
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Re: about EL-based JSTL
Kishi == Kishi Mikio [EMAIL PROTECTED] writes: Kishi Hi, Kishi I have one question about JSTL (especially, expression language). Kishi Now, I have restructed a system with Java2EE, Kishi and considered the use of JSTL Kishi and other tag libraries(jakarta-talibs) at that time. Kishi But, because expression language is available in only JSTL, Kishi it is inconvenience. Also, expression language has some problems. Kishi For example, it is impossible to use a method invocation Kishi except getter and setter (such as List#size()), Kishi a method invocation with arguments, and so on. Kishi So, I have considered the use of not EL-based JSTL but RT-based JSTL Kishi in all JSP parts . Kishi Has it made a mistake in this strategy ? Kishi Is it better to use EL-based JSTL ? As Henri mentioned, JSP 2.0 will use the EL in all tag attributes, and in body content. There are also a small number of other libraries that use the EL engine for attribute values, including the Struts tag library, using the Struts-EL contribution. In JSP 2.0, issues with method invocation in the EL will be somewhat addressed. I would hesitate to go much further than JSP 2.0 is going, as that would make it easier to pollute view logic with business logic. -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] ; SCJP; SCWCD -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: How to insert a string into a tag parameter
Thomas == Thomas J Zvolensky Zvolensky writes:
Thomas I have a JSP that receives three strings from an upstream form. I would
like to insert one of the passed strings as a value within a c:import tag. See the
last line of code snippet below.
Thomas %--
Thomas Get Project, Owner and XML file path from the form
Thomas --%
Thomas jsp:useBean id=parameters class=com.plv2.FormBean scope=page /
Thomas %
Thomas String project = request.getParameter(project);
Thomas String owner = request.getParameter(owner);
Thomas String xmlfile = request.getParameter(xmlfile);
Thomas %
Thomas %--
Thomas open the ShareWeb export file
Thomas --%
Thomas c:import var=shareweb url=%=xmlfile% /
Thomas It seems my syntax is incorrect as url=%=xmlfile% results in a
compilation error.
Thomas Does anybody know the correct way to do this?
If those values are coming from request parameters, than you can use the EL
syntax to reference request parameters directly:
c:import var=shareweb url=${param.xmlfile} /
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Re: invoking a JSP or servlet
Anuj == Anuj Agrawal [EMAIL PROTECTED] writes: Anuj Also, did you really mean that the welcome jsp would forward to the first Anuj action, and not redirect to the first action? I.e. is it jsp:forward Anuj page=../ or c:redirect url=.. / .. The forward appears to be a better Anuj option since the URL in the browser doesn't change. The answer, of course, is that it depends. Once you understand the difference between forward and redirect, you have to decide based on what you want your application to do. In some cases, you DO want the browser URL to change. I don't think it's likely in this situation, however. -Original Message- From: Karr, David [mailto:[EMAIL PROTECTED]] A common pattern is to have your welcome file be a jsp that does nothing but forward to your first action. -Original Message- From: Anuj Agrawal [mailto:[EMAIL PROTECTED]] Is it accurate to say that we should never invoke a JSP file directly? It should always be forwarded to from some servlet? What if my first page (say, index.jsp) of my web app has some db query results being displayed, is the right way to make it so that my first page is a servlet and after doing all the db stuff, it forwards to the index.jsp? If that's true, then is there a way to configure the web app (guessing via web.xml) so that the welcome file is a particular servlet? -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] ; SCJP -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: rtexprvalue and EL
Affan == Affan Qureshi [EMAIL PROTECTED] writes:
Affan I want to do a test like this:
Affan c:if test=${parameter.type == %= ParameterBean.TEXT%}
Affan nested:text property=value /
Affan /c:if
Affan I am comparing a value against a constant in a class but I can't execute a
Affan RT expression in a c:if when using the EL tags. How do I accomplish this
Affan in EL?
Affan Of course I can initialize pageContext variables with all the constants and
Affan do EL comparisons using them. But is there another way to do this?
The EL only references javabean properties. That's what you have to work with.
Write a function which takes a class and a hashmap, and uses reflection to
populate all the constant symbols into the hashmap. You can then reference
that hashmap in the EL. Either that, or use both the c and c-rt tags, and
use c-rt:set to set a scoped attribute and then c:if (I think that would
work).
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Re: [standard] nested forEach tags?
Wendy == Wendy Smoak [EMAIL PROTECTED] writes:
Wendy Can you nest c:forEach tags? I can't find an example of it, and it's not
Wendy working for me.
Wendy c:forEach items=${itemList} var=item
Wendy hr
Wendy c:out value=${item.id}/. c:out value=${item.text}/br
Wendy c:forEach items=${item.options} var=option /
Wendy c:out value=${option.text}/
Wendy /c:forEach
Wendy c:out value=${item.answer}/br
Wendy /c:forEach
Wendy The first /c:forEach tag ends the loop.
Wendy Should this be working? Does anyone see anything wrong with this?
The typo you refer to is in the first c:forEach. The line ends with /.
That's why the second /c:forEach ended up in the output.
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Re: Getting values from a Map in JSTL-EL
Affan == Affan Qureshi [EMAIL PROTECTED] writes:
Affan I have two questions. How to get values if my bean has a method that returns
Affan a Map? I have a bean with getValues() method that returns a Map.
Affan I have tried
Affan c:out value=${specs.values.paramId} /
Affan c:out value=${specs.values[paramId]} /
Affan c:out value=${specs.values.map.paramId} /
Affan But I get the following error:
Affan Unable to find a value for map in object of class
Affan java.util.HashMap$Values using operator .' (correspondingly)
Did you try all three of these at the same time? The last one is obviously
broken, which is why you got the error.
The second one and the first one are actually slightly different. The first
one looks for a key of paramId in the map, and the second one looks in the
map with a key that is STORED IN the scoped attribute named paramId. If you
wanted to change the second one to do the same thing as the first, change it
to:
c:out value='${specs.values[paramId]}' /
Affan Also my bean also has a method that takes a String and returns the value
Affan Object from the map. Its signature is:
Affan public Object getValue(String key)
Affan How do I use this method using EL?
You can't. This kind of expression (called mapped properties) is supported
by the Jakarta Commons BeanUtils package, but not with the JSTL.
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Re: [jstl] jsp:forward ideas
Henri == Henri Yandell [EMAIL PROTECTED] writes:
Henri I'd like to do the following:
Henri jsp:forward page=somePage.jsp
Henri jsp:param name=id value=${param.id}/
Henri /jsp:forward
Henri Now, obviously this is not going to work until JSP 2.0.
Henri So then there's the next step of:
Henri jsp:forward page=somePage.jsp
Henri jsp:param name=id value=c:out value=${param.id}//
Henri /jsp:forward
Henri Which due to the order of parsing also fails to work. [This has come up
Henri enough on this list].
Henri Now, my question is, is there anyway around this?
Henri Apart from the obvious: % request.getParameter(id) %.
Just use different quotes at the other level:
jsp:forward page=somePage.jsp
jsp:param name=id value='c:out value=${param.id}/'/
/jsp:forward
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Re: [jstl] jsp:forward ideas
Henri == Henri Yandell [EMAIL PROTECTED] writes:
Henri On 7 Nov 2002, David M. Karr wrote:
Just use different quotes at the other level:
jsp:forward page=somePage.jsp
jsp:param name=id value='c:out value=${param.id}/'/
/jsp:forward
Henri Nope, not happy. I had:
Henri jsp:forward page='c:out value=${param.goto}/'
Henri jsp:param name=id value='c:out value=${param.id}/'/
Henri /jsp:forward
Henri [which was working as:
Henri c:redirect url=${param.goto}
Henri c:param name=id value=${param.id}/
Henri /c:redirect
Henri ]
Henri and I get an error of:
Henri message /c:out value=${param.goto}/
Henri description The requested resource (/c:out value=${param.goto}/) is not
available.
Henri So it's not parsing the inside of page attribute for jstl I guess. [I
Henri flipped the ' and just in case. Figured it wouldn't hurt :) ]
Oh. Duh.
In that case, I guess you either use the scriptlet, do it at the servlet level,
or use Struts-EL (logic-el:forward). I don't see a clean way to do it
otherwise.
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Re: JSTL that uses java.net.URLEncoder.encode
nickm == nickm Stefan writes: nickm Hi, nickm Is there a JSTL tag that reproduces / applies java.net.URLEncoder.encode so as to properly encode query strings? You should read the specification, which you can get to at http://java.sun.com/products/jsp/jstl/. Read the section entitled URL Related Actions, which talks about building urls and encoding parameters. -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:taglibs-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:taglibs-user-help;jakarta.apache.org
Re: utility taglib, basic looping
Thomas == Thomas Delnoij [EMAIL PROTECTED] writes:
Thomas Hi Shawn,
Thomas Sorry, I misunderstood both you and the website. If this is a widely held
Thomas misunderstanding, then I would suggest that the website is not clear enough
Thomas on this topic...
Thomas I am actually working on an alternative:
Thomas ?xml version = '1.0' encoding = 'windows-1252'?
Thomas jsp:root xmlns:jsp=http://java.sun.com/JSP/Page; version=1.2
Thomas jsp:directive.page contentType=text/html;charset=windows-1252/
Thomas html
Thomas head
Thomasmeta HTTP-EQUIV=Content-Type CONTENT=text/html;
Thomas charset=windows-1252/
Thomastitletest/title
Thomas /head
Thomas body
Thomas jsp:scriptlet
Thomas for (int i = 0; i 8; i++)
Thomas {
Thomas /jsp:scriptlet
Thomas jsp:expression i /jsp:expression
Thomas jsp:scriptlet
Thomas }
Thomas /jsp:scriptlet
Thomas /body
Thomas /html
Thomas /jsp:root
Thomas On compilation:
Thomas Error(11,24): Expected name instead of .
Thomas Error(11,25): Expected name instead of 8.
Thomas Error(11,26): '=' missing in attribute.
Thomas Error(11,27): Attribute value should start with quote.
First of all, why are you trying to use the XML format? It may be convenient
for computers, but it's not convenient for humans. Your compile errors
probably have a little to do with the fact that you're not CDATAing your
scriptlet content.
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Re: ExpressionUtil.evalNotNull doesn't return NAE on null value
Shawn == Shawn Bayern [EMAIL PROTECTED] writes: Shawn On 13 Oct 2002, David M. Karr wrote: In particular, I see that the NullAttributeException is thrown if the expression string was not null, but the resulting value was null. However, if the expression string was null, it just returns null. Shawn, could you explain the motivation for this? I'm wondering why it doesn't throw the NAE if the expression string was null. Shawn In some cases, there's a difference between an attribute not being Shawn specified (which might be allowed) and evaluating to null (which might Shawn need to be reported as an error). Including this check in this particular Shawn utility method is arbitrary, but it allowed us to factor out logic Shawn conveniently. Shawn For instance, 'escapeXml' in c:out is one such attribute. For this Shawn attribute, we can simply write Shawn boolean escapeXml = true; Shawn Boolean escape = ((Boolean) ExpressionUtil.evalNotNull( Shawn out, escapeXml, escapeXml_, Boolean.class, this, pageContext)); Shawn if (escape != null) Shawn escapeXml = escape.booleanValue(); Shawn and let the NullAttributeException propagate. Shawn Of course, we could have simply checked for this outside the method, too. Shawn Some of this code grew organically, changing slightly rather than being Shawn completely rewritten as the spec was updated. While I don't have a Shawn problem with the current evalNotNull() method, there are certainly other Shawn ways we could have organized it. For instance, we could have used Shawn type-specific methods, with 'allowNull' as a boolean attribute. But Shawn evaluate but do not produce null was a common enough case that the Shawn method seems useful. Shawn Did that answer your question? Well enough, thanks. -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: incorporating EL support
Craig == Craig Longman [EMAIL PROTECTED] writes:
Craig i see in the src dist for the reference jstl that there are a couple of
Craig classes that look promising to use. one is an interface
Craig (ExpressionEvaluator) and then an implementing class
Craig (ExpressionEvaluatorManager). using it appears to be as simple as this
Craig (from tag/el/core/ForEachTag.java):
Craig if( begin_ != null )
Craig {
Craig Object r = ExpressionEvaluatorManager.evaluate(
Craig begin, begin_, Integer.class, this, pageContext );
Craig if (r == null)
Craig {
Craig throw new NullAttributeException(forEach, begin);
Craig }
Craig begin = ((Integer) r).intValue();
Craig validateBegin();
Craig }
Craig it is acceptable to utilize this class in this manner for custom tags?
Craig or is there a better/standard way. i have been unable to find any docs
Craig that talk about using the standard EL in your own tags, but if anyone
Craig has any pointers, i would greatly appreciate it.
Another basically equivalent alternative is something like the following. I
think I'm gravitating towards using ExpressionEvaluatorManager, instead of
ExpressionUtil, as shown here, because I'm just planning on ignoring null
values, which seems more efficient (at least from the POV of the interface) to
do with ExpressionEvaluatorManager and ExpressionUtil. You treat null values
as an error, which is just a different approach.
try {
setArg0((String)ExpressionUtil.
evalNotNull(message, arg0, getArg0(),
String.class, this, pageContext));
} catch (NullAttributeException ex) {
setArg0(null);
}
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Diff. between logic:equals and EL eq between null and
I noticed that with the Struts logic:equal tag, if you're comparing a null-valued property with , it returns true. This is not unexpected, as the documentation specifically states that a null property value is coerced to a zero-length string before a comparison occurs. However, in the JSTL, with an EL expression, comparing a null-valued scoped variable with 'eq ', it appears to return false. This is curious, as I noticed the statement in the JSTL spec in section A.7.1, titled Coerce A to String, which says 'Otherwise, if A is null: return .' If this is true, this would imply that comparing a null-valued SV against would return true. Is there something wrong here, either with the implementation or the spec? -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Is it meaningful that there are no default values?
In building the Struts-EL tag library, I haven't ported Struts tags that
provide functionality that are directly supported in the JSTL. However, in
some of those tags I haven't ported, I have noticed one small feature that
isn't strictly provided in their JSTL analogs.
The issue is default values. For instance, in the Struts bean:cookie tag,
it will assign the value of a cookie to a variable, but if the cookie isn't
defined, you can specify a default value that will be assigned to the variable.
There are a couple tags in the bean library that have this feature.
In the JSTL, there's no quick way to get this. I believe, for each variable
that you want to have a default value, you'd do something like this, after
every c:set (perhaps) that reads a value you hope is defined:
c:if test=${empty variable}
c:set var=variable value=default value/
/c:if
(I guess this avoids the question of the difference between a null string and
an empty string.)
If I were to suggest an enhancement, it would be a default attribute on
c:set that can take an EL expression. Is there any perception that this
might have enough value for a formal enhancement report?
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Re: Is it meaningful that there are no default values?
Shawn == Shawn Bayern [EMAIL PROTECTED] writes: Shawn The c:out tag has just the sort of 'default' attribute you suggest; you Shawn can use it in conjunction with c:set and many other JSTL tags. Sigh. I probably looked at that page a hundred times. -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Any way to import file as a resource?
Is there a practical way to import a file as a resource? The c:import tag doesn't quite work. For example, I'd like to read in the /WEB-INF/web.xml file and parse/display it. I can do this with Struts (bean:resource), but I'd like to know for sure whether I can or can't do it with pure JSTL. I need this to work for other files besides XML files, so an identity transform with x:transform wouldn't be sufficient. -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: Any way to import file as a resource?
Martin == Martin Cooper [EMAIL PROTECTED] writes: Martin I'm not sure why you say c:import won't work. You can do this, which I Martin think is what you want: Martin c:import var=xml url=/WEB-INF/web.xml/ Hmm. That wasn't working. The resulting variable was empty. I guess I'll have to track it in the debugger. I don't see what could be wrong. -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
No indexed access ala Struts?
I don't think this is available in the EL, but I'll ask just to make sure.
Struts property references allow you to specify array indices, like
arrayIndexed[3], when you have a method in your bean like this:
public int getArrayIndexed(int index) {
return (arrayName[index]);
}
This is in addition to the more conventional references like array[3], with a
corresponding bean method of this:
public int[] getArray() {
return (this.arrayName);
}
JSTL can deal with the latter, allowing a reference like array[3]. I don't
believe it will handle the former in any way. Is that correct? I've tried
some experiments and gone through the EL syntax, and I don't see anything like
this.
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Re: Any way to import file as a resource?
David == David M Karr [EMAIL PROTECTED] writes: Martin == Martin Cooper [EMAIL PROTECTED] writes: Martin I'm not sure why you say c:import won't work. You can do this, which I Martin think is what you want: Martin c:import var=xml url=/WEB-INF/web.xml/ David Hmm. That wasn't working. The resulting variable was empty. I guess I'll David have to track it in the debugger. I don't see what could be wrong. After tracking the c:import of /WEB-INF/web.xml, I don't see why I didn't get anything. However, I did try adding imports of several other files, to see whether they worked or not: /thing.xml: Worked /dir/thing2.xml:Worked /WEB-INF/anotherThing.xml: Failed /WEB-INF/struts-config.xml: Failed Is this related to the restriction against directly serving files in the WEB-INF directory? I had no problem getting /WEB-INF/web.xml with the bean:resource Struts tag. All of these tests are running in TC 4.0.4. -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Best way to evaluate several expressions at once?
In my derived Struts-EL tags, I evaluate all of the attributes of a tag in the
same way, all at the same time. Following this are some examples:
---
try {
setAltKey((String)ExpressionUtil.
evalNotNull(checkbox, altKey, getAltKey(),
String.class, this, pageContext));
} catch (NullAttributeException ex) {
setAltKey(null);
}
try {
setDisabled(((Boolean)ExpressionUtil.
evalNotNull(checkbox, disabled, getDisabled() + ,
Boolean.class, this, pageContext)).
booleanValue());
} catch (NullAttributeException ex) {
setDisabled(false);
}
try {
setCollection(ExpressionUtil.
evalNotNull(size, collection,
getCollectionExpr(),
Object.class, this, pageContext));
} catch (NullAttributeException ex) {
setCollection(null);
}
---
The first two are from the same class, and the third one is from a different
class. The first attribute is just a string type. The second one is a
boolean, and the third is a Collection type (Collection or Array).
Every attribute is handled exactly this way (with a little more thought, the
derived classes could be generated from the XML files used to contain the TLD
information and the documentation).
My question to you is, is there a better and/or more efficient way to process a
bunch of EL expressions in a block? What I have is straightforward, but I'm
wondering if there is a better way to do this.
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Re: How to use JSTL engine to evaluate exprs in a context?
David == David M Karr [EMAIL PROTECTED] writes: David Alternatively, I'd also like to consider the possibility of the form bean being David REALLY implicit, not referencing it explicitly in the expression at all, but I David don't understand how I could manage that. I think I now understand how to do part of this, which is to define a resolveVariable() method in a VariableResolver subclass which just uses BeanUtils.getProperty(beanName, pName) (where pName is the variable to be resolved). I wonder, however, if I would be looking up the beanName explicitly here, or whether I would have that being sent in as the pContext? Outside of this, I still don't see how I can fit a derived VariableResolver into a framework that would allow me to evaluate EL expressions with it. -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Status on Struts-EL
the user would wrap with ${ and }, and would be
used as the element value, in the context of the explicit or implicit bean.
The property attribute would still be used as the HTML name attribute. If
the elproperty attribute was not present, the behavior would be as it was
before.
Along with these ideas, I did realize another completely different strategy for
building this library. Instead of trying to change how it works under the
covers, I could simply implement a tag library that exactly matches the Struts
tag libraries, but all of whose attributes are evaluated with the EL engine.
The internal behavior of the name, property pairs would be unchanged, but
attribute values could be specified as EL expressions in addition to, or
instead of, rtexprvalues. This would clean up the nasty code I've seen people
write to assemble an on... attribute value from pieces. I believe this only
becomes a slight implementation difficulty for attributes whose type is not
String or boolean, like the collection attribute of some tags. Since from
the point of view of JSP, an EL expression is just a string, that wouldn't map
directly to a javabeans set method that takes a Collection. In these cases, I
believe I'd have to implement a BeanInfo class that specifies a method in my
subclass, like setCollectionExpr() or something like that, which I can map
into the base class setCollection() method.
I'd appreciate any useful comments or suggestions.
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Building JSTL with JDK 1.4 (minus jaxp-api.jar)?
I was experimenting with building the JSTL from source, but I noticed it doesn't deal properly with building with JDK 1.4, as it requires the presence of jaxp-api.jar, which I believe is part of JDK 1.4. -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: Off-topic: Deploy compiled JSPs
Eric == Eric Lewis [EMAIL PROTECTED] writes: Eric Hi all Eric Since compiling a JSP page means a big overhead for the server, has anyone Eric ever tried to compile them on a development server and then deploy them to a Eric production server? Ideally, Tomcat should compare the timestamp of the JSP Eric and the .class and take the latter... As Hans replied, most servlet containers provide a tool for precompiling JSP pages into servlets. Each one of them does about the same thing, with minor differences. The basic idea is that you generate a servlet class from the JSP page and compile the generated servlet. You also have to build a fragment of the web.xml file representing the mappings from *.jsp to your new servlet classes, and either use XML external entities to include that fragment in your base web.xml file, or use XSLT to merge the two files. I prefer the latter approach (partly because I could never get the XML external entity solution to work in Tomcat). I've looked at a few different servlet containers, and Tomcat is the only one that I know of that generates the fragment to include in the web.xml file. However, it's not difficult to generate that fragment with a shell or perl script. And don't forget to exclude your JSP pages from the final WAR file, as you don't need them anymore (and as proof your process is working). -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Warning about slight non-equivalence between . and []
The specification states that the . and [] operators are equivalent. This
is essentially true. However, it would be useful to point out there are some
situations where you could get dramatically different results from two
expressions using these two operators.
The basic prototypical example would be:
${header[user-agent]}
${header.user-agent}
The first probably gives you what you would expect. The second gives you 0,
as it's subtracting two probably unset values.
You should especially be wary of this if you're somehow constructing the EL
expression from dynamic values (like if you're using the JSTL expression engine
itself, as opposed to using the JSTL tag library).
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Re: Warning about slight non-equivalence between . and []
Shawn == Shawn Bayern [EMAIL PROTECTED] writes:
Shawn On 22 Jul 2002, David M. Karr wrote:
The specification states that the . and [] operators are
equivalent. This is essentially true. However, it would be useful to
point out there are some situations where you could get dramatically
different results from two expressions using these two operators.
The basic prototypical example would be:
${header[user-agent]}
${header.user-agent}
The first probably gives you what you would expect. The second gives
you 0, as it's subtracting two probably unset values.
Shawn Thanks for the feedback, but the spec doesn't claim unqualified
Shawn equivalence between the . and [] operators. Instead, it says:
Shawn expr-a.identifier-b is equivalent to a[identifier-b]
Shawn In your example, user-agent is not an identifier; valid identifiers are
Shawn defined in seciton A.8 to be Java language identifier[s], which cannot
Shawn contain -.
You're right, of course. This just seems like a place where people could get
tripped up.
I didn't write this note as feedback for the spec, just a warning for users who
might think of these two operators as completely equivalent.
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Re: foreach strangeness...
Julia == Julia A Case [EMAIL PROTECTED] writes:
Julia I'm trying to use foreach in the following way
Julia c:forEach var=genre items=%= utilBean.getGenres() %
Julia jsp:useBean id=genre type=String/
Julia %= genre %
Julia /c:forEach
Julia getGenres() returns an array of Strings
Julia The same logic works both above and below with other functions. But
Julia this one keeps telling me bean genre not found in scope. Looking at the
Julia java code that is created from the jsp it looks like it tests for a null
Julia and generates that message, but if I simply replace the jsp:useBean and
Julia the next line with some sort of string to print it prints the correct
Julia number of times, so I know it's getting the array.
I would assume you're using the -rt library, if your loop iterated the
correct number of times.
I believe that, even in the -rt library, that the JSTL does not create
scripting variables, just scoped variables in the application, session,
request, or page.
If you want to print out the value of the string, then just do this:
c:forEach var=genre items=%= utilBean.getGenres() %
c:out value=${genre}/
/c:forEach
Even better, if you use the non-rt library:
c:forEach var=genre items=${utilBean.genres}
c:out value=${genre}/
/c:forEach
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Re: Is any way to generate a Key dynamicaly?
Vernon == Vernon Wu [EMAIL PROTECTED] writes: Vernon I use the i18n tag from the JSTL in a Web application. Some of message keys are constructed in the format as Vernon field_name.item_name Vernon I would like to store the item_name only in DB and reconstruct a key dynamicaly. Vernon Doesn't it can be done? If so, how to do it? Well, the key attribute for fmt:message can take a dynamic value, so you can construct the key string from a variable or expression and provide it as the value of the key attribute. The form of the dynamic value depends on whether you're using EL taglib (expression language) or the RT taglib (runtime(?)). If you're unsure of how to do all of this, make sure you read the entire specification (if you skip the SQL and XML tags, you'll save a lot of time towards getting a good understanding of JSTL usage). -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: FIFO ordering of input:select tag options
Rajiv == Rajiv Kewalramani [EMAIL PROTECTED] writes: Rajiv I have a need to impose First In First Out ordering of select options. I Rajiv ended up modifying the select tag, replacing the Map representing the Rajiv options with a pair of Collections. Rajiv Is there an easier/better way to do this using the existing input:select Rajiv tag? Well, I don't see a way to use the existing tag, without modifying it. If you want a slightly better solution than a pair of Collections, you could use the SequencedHashMap in the new release of the Commons Collections library. I haven't used this, I just noticed it in the release notes. -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: JSTL Struts
Jeff == Jeff Ling [EMAIL PROTECTED] writes: Jeff Hi, Jeff I am using struts with JSTL. In one place I write something like this: Jeff c:import value=mytestprogram.do/ Jeff It throws an JSP exception at runtime. Jeff Is this because struts will forward to the actual page when it sees *.do? Is Jeff there any workaround? I'm not sure anymore whether this can work, but I have one question. In the action that processes the /mytestprogram action, when it finally selects an ActionForward to forward to, is the redirect flag on that ActionForward set to true (this is set in the forward element in your struts-config.xml file)? I would think this would only have a chance to work if redirect was false on that element. -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: Taglibs and included pages
Bryan == Bryan P Glennon [EMAIL PROTECTED] writes: Bryan I'm seeing some strange (or maybe intended) behavior with taglibs and Bryan included files. Here's what I do: Bryan %@ taglib prefix=bean uri=/WEB-INF/struts-bean.tld % Bryan %@ taglib prefix=html uri=/WEB-INF/struts-html.tld % Bryan Normal JSP/HTML stuff... Bryan html:form action=/action.do style=margin-botton:0m Bryan TABLE Bryan jsp:include page=/Common/foo1.jsp/ Bryan !-- Page specific rows go here -- Bryan /TABLE Bryan HR Bryan TABLE Bryan jsp:include page=/Common/foo2.jsp/ Bryan !-- More page specific rows here -- Bryan /TABLE Bryan /html:form Bryan The problem is with the two include files. If I don't repeat the % taglib declarations Bryan in the included files, they don't work. It seems to me that once the Bryan libs are declared, Bryan that declaration should hold for the remainder of the page. I'm sure I'm Bryan missing something Bryan here, and I'm looking for enlightenment. It helps to understand how the JSP include action works, as opposed to the include directive. Your main JSP and your included JSP pages are all compiled into individual servlets. They have to be able to work independently (even if they're generating only a fragment of the output). The include action happens at execution time, whereas the include directive happens at compile time. You could get away with leaving out the taglib declarations in the included pages if they were included with the directive, but not if they were included with the action. -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: Error using JSTL
Thomas == Thomas J Zvolensky Zvolensky writes: Thomas Hi, Thomas I'm attempting to use the SQL tags provided with the JSTL 1.0 beta tag Thomas library. Thomas When I add the following line to my jsp page to import them into the page: Thomas %@ taglib prefix=sql uri=http://java.sun.com/jstl/ea/sql; % Thomas I get the following error screen for my page: Thomas Thomas ++ Thomas root cause Thomas Unable to parse the expression: Thomas org.apache.taglibs.standard.lang.jstl.parser.ParseException: Encountered : Thomas at line 1, column 6. Could you show us the entire JSP, or at least the beginning of it, including this line? -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: Error using JSTL
Thomas == Thomas J Zvolensky Zvolensky writes:
Thomas Here is the top part of the JSP:
Thomas
Thomas ++
Thomas sql:driver
Thomas var=example
Thomas driver=${org.gjt.mm.mysql.Driver}
Thomas url=${dbc:mysql://carlsonr:3306/DocumentumUsage}
Thomas /
I believe your sql:driver element is the problem. Your url attribute is
incorrect. I would guess it should be:
url=jdbc:mysql://carlsonr:3306/DocumentumUsage
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Re: Error using JSTL
Thomas == Thomas J Zvolensky Zvolensky writes: Thomas Yep. Thomas I removed the EL parser from the other lines. Why is is shown that way in Thomas the examples? Thomas The page works now. The only examples I've seen (in the samples and in the spec) of SQL tags that use the EL for those attributes are ones that really need them, the ones that have the values stored in scoped variables. -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: Can you test for a cookie's value using c:if tag?
Shawn == Shawn Bayern [EMAIL PROTECTED] writes:
Shawn On Thu, 21 Mar 2002, Matt Raible wrote:
Is it possible to do the following with JSTL?
c:if test=${cookie.username == 'learner'}
learner
/c:if
Shawn Ah, I was hoping someone would ask. The answer is no, not exactly like
Shawn that, but you can still use JSTL to access cookies.
Shawn While web developers often have the urge to access a cookie by name, it's
Shawn an urge that's best to resist; cookies aren't identified by name alone,
Shawn but by name, domain, path, and security status. Thus, the best way to
Shawn access a cookie is to loop over the list of available cookies, matching
Shawn the one that you're interested in.
Shawn Now, if you're just interested in name, that's fine; but JSTL doesn't go
Shawn out of its way to support that special case. Instead, you can just write
Shawn c:forEach items=${pageContext.request.cookies} var=cookie
Shawn c:if test=${cookie.name == 'learner'}
Shawn c:set var=cookieValue value=${cookie.value} /
Shawn /c:if
Shawn /c:forEach
Curious. Not that I would necessarily want to do this, but from the JSTL
specification, it almost seems like you could do something like this:
x:set var=username select=$cookie:username/
c:if test=${username == 'learner'}
So it appears that simple access to cookies is in the XML tags, but not the
core tags? Please correct me if I'm confused (likely).
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Re: How do you download the XSL taglib for windows?
Liz == Liz Gallagher Gallagher writes: Liz The XSL taglib is not included in the entire binary distibution of the Liz taglib nightly builds (I've downloaded and checked them ALL). There are no Liz XSL taglib release builds and all of the XSL taglib nightly builds are in Liz tar format. I can usually use Winzip to extract tarred files, but I am Liz getting the error: invalid archive directory. I've even gone as far as Liz FTPing one of the tar files to a unix box and I have not been successful Liz untarring it there either. Liz Thank you for any help you can give me, Liz Liz Gallagher Are you averse to using the JSTL itself? The JSTL has XML/XSLT functionality, which is well described in the JSTL specification. In particular, the x:transform tag does what the InsertWithXSL tag did, and more. -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: loading a singleton class in jsp
Michael == Michael Buenaventura [EMAIL PROTECTED] writes: Michael Hi, I'm using struts framework and I was trying to load a singleton class Michael that will hold my dropdown list of state in my jsp. Michael jsp:useBean id=StateLookup scope=session Michael class=com.blah.StateLookup.getInstance();/ Michael StateLookup is a singleton class. Michael I'm using the jsp:useBean so that I can use these struts tag lib Michael html:select property=state tabindex =key html:option Michael value=/html:option Michael bean:define id=stateID name=StateLookup property=stateList / Michael html:options collection=stateID property=key labelProperty=value/ Michael /html:select Michael Am I doing it the wrong way? Your input will be greatly appreciated. First of all, it appears that you hit Reply when you wrote this note. If you have a new note to write, don't use Reply. Many mail clients can thread notes with the original note. If you write a new note as a Reply to another note, it will often get lost. On your issue, you're misunderstanding how jsp:useBean and the class attribute work. The value of the class attribute is the fully-qualified name of a class. You can't specify a class and a method, or any variation. The given class will be used to call the constructor to create an instance of the class. You can't use singletons like this. However, if you let jsp:useBean create the instance of the class and place it into session scope, you get essentially the same behavior. You might even consider using application scope. -- === David M. Karr ; Java/J2EE/XML/Unix/C++ [EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: [standard] examples won't work
Shawn == Shawn Bayern [EMAIL PROTECTED] writes: Shawn Achim, Shawn It looks like the problem may just be caused by two conflicting versions Shawn of JAXP: java.lang.ClassCastException: org.apache.crimson.jaxp.DocumentBuilderFactoryImpl Shawn Since your stack trace doesn't run through any code in the JSTL RI, my Shawn guess is that this is just a minor configuration issue with your Shawn container. I saw the same thing. I tried to run it on Tomcat 4.0.2b1, essentially OOTB. This is apparently an issue with the continuing battle between crimson.jar and xerces.jar. I think, in 4.0, Jasper was using crimson, and now it's using xerces. The examples are using crimson, so these examples won't work OOTB with Tomcat 4.0.2b1. I don't know what the correct solution is, but I guess one of them has to be removed and changed to the other. -- === David M. Karr ; Best Consulting [EMAIL PROTECTED] ; Java/Unix/XML/C++/X ; BrainBench CJ12P (#12004) -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
