Accessing properties
Hello All, I'm trying to use the value of a property in a c:if test= element. I have the Properties object in application scope, but I can't seem to figure out how (of if) I can address the individual property value of a given key. Something like props.get(viewer.tool.useZoomIn) in a scriptlet. I thought about transfering the properties to a HashMap, but given the .s embeded in the property keys, wasn't sure how I'd access them even then. Thanks for any help or suggestions! -- john = John Cartwright Associate Scientist Geospatial Data Services Group CIRES, National Geophysical Data Center/NOAA (303) 497-6284 [EMAIL PROTECTED] = - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
retrieve image from dynamic source and c:url
Hello All,
I'm trying to create a page using an HTML img tag that has as it's src
attribute a URL.
my initial attempts were along the line of:
img src=c:url value=http://mapserver/servlet/com.esri.wms.Esrimap;
var=url
c:param name=servicename value=${param.servicename}/
/c:url
however, the src attribute has the value of empty string in the
resulting page. Can someone point out what I'm doing wrong or suggest a
better approach?
Thanks!
-- john
=
John Cartwright
Associate Scientist
Geospatial Data Services Group
CIRES, National Geophysical Data Center/NOAA
(303) 497-6284
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access to nested objects
Hello All,
can someone clarify for me how to use an expression to get to a nested
field in a bean. For example, I have a bean mapserviceDetailForm with
a method that returns another bean service, and I want to reference
the name field within the service bean.
I was trying variations on:
c:set var=mapservicename
value=${mapserviceDetailForm.service.name}/
Can someone clarify for me?
Thanks!
-- john
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Re: c:if and boolean value
Thanks for the suggestion, Tim. I actually did buy Shawn's book (in PDF
form), I just haven't quite gotten familiar with it to remember all the
resources that are there. Still used to hard-copy, I guess :-) .
-- john
Tim Kettering wrote:
John,
Download the PDF at this URL and keep it around:
http://www.manning.com/bayern/appendixA.pdf
I've found it quite useful in terms of referencing JSTL tags, and for finding examples
of how such tags are written. I certainly wish it had a bit more examples, but I suppose thats why you buy the book, as Bayern would like. :)
-tim
On Thursday, February 06, 2003, at 11:51AM, John C Cartwright [EMAIL PROTECTED] wrote:
That works great, thanks to both Tim and Pierre. One follow up question
though - is there a c:else tag to go with the c:if?
Thanks again!
-- john
Timothy Kettering wrote:
Yeah, that occured to me after I sent off the email and was sitting on
the couch watching Law Order on TNT. Somehow I just couldn't be
bothered enough to go back to the computer and follow up on it. :)
Anyway, more ways to skin the proverbial cat...
-tim
On Wednesday, February 5, 2003, at 09:37 PM, Pierre Delisle wrote:
Try the following:
c:if test=${mapservice.running}
[What Timothy suggested would also work, but there is no need
to test against true, since you already have a boolean expression
for your test.]
-- Pierre
Timothy Kettering wrote:
offhand, id say you should be doing this. (enclose the entire
evaluation in the curly braces)
c:if test=${mapservice.running == true}
On Wednesday, February 5, 2003, at 08:23 PM, John C Cartwright wrote:
Hello All,
I have a isRunning() method in my bean that returns a boolean. I'm
try to test against that value with something like the following:
c:if test=${mapservice.running} == true
img src=../images/TransGear.gif width=20 height=20
/c:if
The problem is that even though the bean's getter method is properly
returning the true value (I can print it into the HTML page), the
above conditional always fails. Can someone point out what I'm doing
wrong?
JSTL v.1.2, core library.
Thanks!
-- john
=
John Cartwright
Associate Scientist
Geospatial Data Services Group
CIRES, National Geophysical Data Center/NOAA
(303) 497-6284
[EMAIL PROTECTED]
=
--
=
John Cartwright
Associate Scientist
Geospatial Data Services Group
CIRES, National Geophysical Data Center/NOAA
(303) 497-6284
[EMAIL PROTECTED]
=
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=
John Cartwright
Associate Scientist
Geospatial Data Services Group
CIRES, National Geophysical Data Center/NOAA
(303) 497-6284
[EMAIL PROTECTED]
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c:if and boolean value
Hello All,
I have a isRunning() method in my bean that returns a boolean. I'm try
to test against that value with something like the following:
c:if test=${mapservice.running} == true
img src=../images/TransGear.gif width=20 height=20
/c:if
The problem is that even though the bean's getter method is properly
returning the true value (I can print it into the HTML page), the above
conditional always fails. Can someone point out what I'm doing wrong?
JSTL v.1.2, core library.
Thanks!
-- john
=
John Cartwright
Associate Scientist
Geospatial Data Services Group
CIRES, National Geophysical Data Center/NOAA
(303) 497-6284
[EMAIL PROTECTED]
=
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Re: problem with SQL tags
Thanks to Buck and Hans for your reponses. Unfortunately, I'm still
having the same problem. I tried:
1) moving the mysql driver JAR file to $TOMCAT/common/lib as Buck suggested
2) unpacking the JAR file into $WEBAPP/WEB-INF/classes
3) getting the latest mysql driver from mysql.com
Still same results, a scriptlet-based connection works, the JSTL
doesn't. I've tried both the 1.0.2 version of the JSTL tags as well as
the nightly build from last Friday.
Here again is the corresponding connection code. There's no difference
that I can see between the driver class name or database URL. Any
further suggestions?
Thanks for your help!
-- john
Hans Bergsten wrote:
Bell, Buck (c) wrote:
Hi John,
My $.02. Although I'm not using MySQL, my experience with Tomcat
4.1.12 has
been that I must place the JDBC Driver classes in the Tomcat common/lib
directory. Although this is somewhat in contrast to the JSTL and other
JARs, I found that including the JDBC driver classes in WEB-INF/lib
not only
caused the error you described, it did so even when I had the JARs in
both
locations. So, you might want to try including the classes ONLY in
common/lib. Of course, once you get the JAR issue resolved, setting
up a
JNDI DataSource (with a pooled connection) is even better.
You need to place them in common/lib only if you use JNDI (because the
JNDI machinery is relying on other class loaders than the ones used
for regular web app resources). Without JNDI, they should be found in
WEB-INF/lib. I agree that using JNDI is a good idea, but what John is
trying should work without it.
Hans
-Original Message-
From: John C Cartwright [mailto:[EMAIL PROTECTED]]
Sent: Monday, November 18, 2002 11:32 AM
To: Tag Libraries Users List
Subject: Re: problem with SQL tags
Thank you for your reply, Hans. The JDBC driver classes are in the
webapps WEB-INF/lib directory and I was assuming that they are being
found because a non-JSTL JSP page with a scriptlet block containing:
Connection con;
try {
Class.forName(org.gjt.mm.mysql.Driver);
con =
DriverManager.getConnection(jdbc:mysql://myhost.noaa.gov:3306/testdb,test
user,testpass);
} catch (Exception e) {
throw (new ServletException(Error loading Driver:
+e.getMessage()));
}
seems to work fine. Does JSTL look for the Driver classes in a
location other than the scriplet-based connection code?
Thanks again!
-- john
Hans Bergsten wrote:
John C Cartwright wrote:
Hello All,
I am hoping that someone can help me to get going with the SQL
tags. I'm trying to connect to a mysql database using tomcat4.1.12
and version 1.0.2 of the library.
Here's my JSP:
%@ taglib prefix=sql uri=http://java.sun.com/jstl/sql; %
%@ taglib prefix=c uri=http://java.sun.com/jstl/core; %
HTML
HEAD
/HEAD
BODY
sql:setDataSource var=monitorDS
url=jdbc:mysql://myhost.noaa.gov:3306/testdb
driver=org.gjt.mm.mysql.Driver
user=testuser
password=testpass
/
/BODY
/HTML
I'm getting a:
org.apache.jasper.JasperException: Unable to get connection,
DataSource invalid: No suitable driver
This is because the JDBC driver classes are not found by the web
container. Make sure you have installed them in the WEB-INF/lib
directory of the application.
[...]
Hans
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CIRES, National Geophysical Data Center/NOAA
(303) 497-6284
[EMAIL PROTECTED]
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Re: problem with SQL tags
Hello again,
I think that I found the problem. I had thought that the exception:
org.apache.jasper.JasperException: Unable to get connection, DataSource
invalid: No suitable driver
was referring to the mysql driver classes not being loaded correctly.
It seems that the problem was actually in the way that I was referring
to the DataSource in the subsuquent sql:query tag. I was using:
dataSource=$monitorDS
but when I changed it to:
datasource=${monitorDS}
everything seems to work fine. I'm still not clear why exactly this is,
but am delighted that it's working. Next task is to set up a JNDI
datasource as Buck suggested. Thanks to all for the help!
-- john
=
John Cartwright
Associate Scientist
Geospatial Data Services Group
CIRES, National Geophysical Data Center/NOAA
(303) 497-6284
[EMAIL PROTECTED]
=
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problem with SQL tags
Hello All,
I am hoping that someone can help me to get going with the SQL tags.
I'm trying to connect to a mysql database using tomcat4.1.12 and version
1.0.2 of the library.
Here's my JSP:
%@ taglib prefix=sql uri=http://java.sun.com/jstl/sql; %
%@ taglib prefix=c uri=http://java.sun.com/jstl/core; %
HTML
HEAD
/HEAD
BODY
sql:setDataSource var=monitorDS
url=jdbc:mysql://myhost.noaa.gov:3306/testdb
driver=org.gjt.mm.mysql.Driver
user=testuser
password=testpass
/
/BODY
/HTML
I'm getting a:
org.apache.jasper.JasperException: Unable to get connection, DataSource
invalid: No suitable driver
exception thrown even though a very similar JSP using standard JDBC
connection methods (listed below) works fine.
Connection con;
try {
Class.forName(org.gjt.mm.mysql.Driver);
con =
DriverManager.getConnection(jdbc:mysql://myhost.noaa.gov:3306/testdb,testuser,testpass);
} catch (Exception e) {
throw (new ServletException(Error loading Driver:
+e.getMessage()));
}
Can someone help me?
Thanks!
-- john
=
John Cartwright
Associate Scientist
Geospatial Data Services Group
CIRES, National Geophysical Data Center/NOAA
(303) 497-6284
[EMAIL PROTECTED]
=
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problem with xercesImpl.jar
Hello All, I apologize if this is slightly off topic, but I was trying to get the standard-examples webapplication running and found that I needed to remove the xercesImpl.jar file from the WEB-INF/lib before things would operate correctly. I was previously getting a NoClassDefFoundError exception complaining about org/w3c/dom/DOMErrorHandler. Is this to be expected? I'm running v1.0 of the taglig, jdk1.4, tomcat 4.0.4 on win2K. Thanks! -- john = John Cartwright Associate Scientist Geospatial Data Services Group CIRES, National Geophysical Data Center/NOAA (303) 497-6284 [EMAIL PROTECTED] = -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: problem with xercesImpl.jar
yes, the war file with the 1.0 binary distribution of the standard taglib. -- john Todd Marti McConnell wrote: John, Do you mean the HSTL standard examples app? todd -Original Message- From: John C Cartwright [mailto:[EMAIL PROTECTED]] Sent: Friday, October 11, 2002 10:46 AM To: [EMAIL PROTECTED] Subject: problem with xercesImpl.jar Hello All, I apologize if this is slightly off topic, but I was trying to get the standard-examples webapplication running and found that I needed to remove the xercesImpl.jar file from the WEB-INF/lib before things would operate correctly. I was previously getting a NoClassDefFoundError exception complaining about org/w3c/dom/DOMErrorHandler. Is this to be expected? I'm running v1.0 of the taglig, jdk1.4, tomcat 4.0.4 on win2K. Thanks! -- john = John Cartwright Associate Scientist Geospatial Data Services Group CIRES, National Geophysical Data Center/NOAA (303) 497-6284 [EMAIL PROTECTED] = -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- = John Cartwright Associate Scientist Geospatial Data Services Group CIRES, National Geophysical Data Center/NOAA (303) 497-6284 [EMAIL PROTECTED] = -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
