Cannot forward after response has been committed
I have a jsp page that processes a login. The (simplified) code is something like this: %@ page language=java% % String userid = request.getParameter(userid); String pw = request.getParameter(pw); /* code to check user id and password */ if (user not found) pageContext.forward(login.jsp); else pageContext.forward(userpage.jsp); % Please note that nowhere in my jsp code do I use the out object or send some outputs back to the client. Yet, I am getting this Cannot forward after response has been committed error. If I comment out the forward statements then the error disappears. Any help is appreciated. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Cannot forward after response has been committed
I have an index.jsp page that checks a user's access level:
%@ page language=java errorPage= %
%
String userid = (String)session.getAttribute(UserId);
if (userid == null) {
pageContext.forward(login.jsp);
} else {
String access = (String)session.getAttribute(Access);
switch (access.charAt(0)) {
case 'A':
pageContext.forward(admin/index.jsp);
case 'R': case 'W':
pageContext.forward(db/index.jsp);
default:
pageContext.forward(login.jsp);
}
}
%
And yet the above page works even with the %@ page language=java %
line. I don't understand why the above code works but the doesn't work
for another page.
What do you propose -- that I remove the %@ page... % line?
[EMAIL PROTECTED] wrote:
Actually, the line end after the first line is sent back to the client,
with apropriate html headers invented.
%@ page language=java%%// now the line end is in java not in html
Yep, looks ugly.
What is even worse is code that sends a redirect and does NOT do a return.
-Original Message-
From: Michael Lai [mailto:[EMAIL PROTECTED]
Sent: Monday, September 19, 2005 10:17 PM
To: Tomcat Users List
Subject: Cannot forward after response has been committed
I have a jsp page that processes a login. The (simplified) code is
something like this:
%@ page language=java%
%
String userid = request.getParameter(userid);
String pw = request.getParameter(pw);
/* code to check user id and password */
if (user not found)
pageContext.forward(login.jsp);
else
pageContext.forward(userpage.jsp);
%
Please note that nowhere in my jsp code do I use the out object or
send some outputs back to the client. Yet, I am getting this Cannot
forward after response has been committed error. If I comment out the
forward statements then the error disappears. Any help is appreciated.
-
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Re: Cannot forward after response has been committed
I put a 'return' statement after every 'forward' statement in all my jsp pages and now it seems to be working. Thanks for your feedback. Actually, my linebreak occurs in the % % tags. I think my email client might have reformatted my output before sending. [EMAIL PROTECTED] wrote: You want the line breaks, either line-feed or carriage-return, line-feed to occur within the java or jsp code, not within the html code. Sometimes the html is buffered and ignored when something else puts out headers or such. Within HTML, line breaks do not matter much Before HTML, any line break implies that HTML has started and you can get default headers without doing anything. Within JSP or Java, line breaks do not matter much. Choice of uglies. %@ page ... %% code here %@ page ... %% code here %@ page % ---there is here the line break of the above line--- % at this point the response has been committed by outputting the above \r\n or whatever - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Cannot connect to database using DataSource
I have a MySQL database in which I created a database named, javatest,
and I am using Tomcat 5.5.9. I have unable to connect my database using
Java's DataSource method. Here is my ROOT.xml setup for my application
context:
Context path= docBase=/home/tomcat/applications/
debug=0 reloadable=true
Resource name=jdbc/DBTest type=javax.sql.DataSource
auth=Container /
ResourceParams name=jdbc/DBTest
parameter
nameusername/name
valuejavauser/value
/parameter
parameter
namepassword/name
valuejavadude/value
/parameter
parameter
namedriverClassName/name
valuecom.mysql.jdbc.Driver/value
/parameter
parameter
nameurl/name
valuejdbc:mysql://localhost/javatest?autoReconnect=true/value
/parameter
/ResourceParams
/Context
I created a simple servlet to test the database connection:
public class TestSQL extends HttpServlet {
private Connection conn = null;
public void doGet(HttpServletRequest request,
HttpServletResponse response) throws IOException,
ServletException {
response.setContentType(text/html);
PrintWriter out = response.getWriter();
try {
Context ctx = new InitialContext();
Context appContext = (Context)ctx.lookup(java:comp/env);
DataSource ds = (DataSource)appContext.lookup(jdbc/DBTest);
conn = ds.getConnection();
} catch (Exception e) {
e.printStackTrace();
}
if (conn != null) {
out.println(Connection successful);
} else {
out.println(Unsuccessful);
}
}
It prints out Unsuccessful. I also tried using the traditional
DriverManager and that works. Here is my web.xml in case it is needed
for analysis:
?xml version=1.0 encoding=ISO-8859-1?
web-app version=2.4 uri=http://java.sun.com/xml/ns/j2ee;
resource-ref
res-ref-namejdbc/DBTest/res-ref-name
res-typejavax.sql.DataSource/res-type
res-authContainer/res-auth
/resource-ref
servlet
servlet-nameTestSQL/servlet-name
servlet-classTestSQL/servlet-class
/servlet
servlet-mapping
servlet-nameTestSQL/servlet-name
url-pattern/servlet/TestSQL/url-pattern
/servlet-mapping
/web-app
I would appreciate it very much if someone can have a look at this and
tell me what I am doing wrong with the DataSource alternative.
Michael.
-
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Re: How to serve just JSP (was: Re: JSP on RHEL4 with Apache httpd RPM?
Peter Flynn wrote: If you have a tomcat webapp that serves jsp's such as http://localhost:8080/mywebapp, then you can map jsp requests to that webapp using JkMount /mywebapp/*.jsp Ah...this exposes the gap in my understanding. Where do I get a tomcat webapp that serves jsp's? This is what I need. I thought one was built into Tomcat -- in fact I thought JSP serving was the original purpose of Tomcat. If Tomcat doesn't have any such webapp, where do I get one? I certainly can't write one, as I'm not a Java programmer. I am limited in my knowledge of tomcat but from my understanding, tomcat can be ran either as a standalone server or behind a webserver. In your case, it seems like you don't actually need a webserver in front so you should be able to connect to tomcat using the url: http://localhost:8080/ Just make sure in your server.xml that you have this line: Connector port=8080 / or whatever port you want to connect to. In fact, I don't think you even need mod_jk if you are using tomcat as a standalone. Hope that helps. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: How to serve just JSP (was: Re: JSP on RHEL4 with Apache httpd RPM?
KEREM ERKAN wrote: OK, start with downloading and installing a binary version of Tomcat for your OS and also download the 1.2.10 version of mod_jk. I think we should handle the rest off list not to bother the list anymore. Just to give you another option if you like. I don't even use mod_jd. I make use of Apache's reverse proxy feature. In my httpd.conf, I add the following lines in my virtual host: ProxyPass /app http://localhost:8081/ ProxyPassReverse /app http://localhost:8081/ Just make sure you have loaded the following modules: LoadModule proxy_module modules/mod_proxy.so LoadModule proxy_ftp_module modules/mod_proxy_ftp.so LoadModule proxy_http_module modules/mod_proxy_http.so LoadModule proxy_connect_module modules/mod_proxy_connect.so What the above does is when Apache sees an url like: http://www.myhost.com/app It passes all traffic to tomcat which is listening to port 8081 (on the same machine). The beauty of this is that you can put this in your ssl.conf too and Apache will handle all encrypted traffic and passes it on to tomcat. The only advantage I see from mod_jk is if you are using it for load balancing too. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Where to put context.xml?
This is probably an obvious question to most but I am new with tomcat 5.5 so I am still trying to figure things out. I want to create a web project with the document base in /home/tomcat/applications as opposed to the normal webapps folder. This is what I have in my server.xml: Server port=8005 shutdown=SHUTDOWN GlobalNamingResources !-- Used by Manager webapp -- Resource name=UserDatabase auth=Container type=org.apache.catalina.UserDatabase description=User database that can be updated and saved factory=org.apache.catalina.users.MemoryUserDatabaseFactory pathname=conf/tomcat-users.xml / /GlobalNamingResources Service name=Catalina Connector port=8081 / Engine name=Catalina defaultHost=localhost !-- Realm className=org.apache.catalina.realm.UserDatabaseRealm resourceName=UserDatabase / -- Host name=localhost debug=0 Context path= docBase=/home/tomcat/applications/ debug=0 reloadable=true / /Host /Engine /Service /Server It works when I point my browser to http://www.myhost.com:8081/ and it shows a customized welcome page from my index.jsp. However, as I understand it, Context should now be in its own xml file. I extracted the Context content and placed it in context.xml. I placed context.xml in $CATALINA_HOME/conf/Catalina/localhost, restarted tomcat but now the browser shows nothing. I also tried placing it in the conf/ folder but that doesn't work either. Where does the file go? Thanks for any help in advance. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Where to put context.xml?
Allistair Crossley wrote: Nearly. Rename your file ROOT.xml and a path of /ROOT and you're away. The other alternative is create in your web application folder META-INF/context.xml Allistair Thank you for your prompt replay, Allistair. I choosed the second option and created the META folder. So I now have: /home/tomcat/applications/META-INF/context.xml And my context.xml shows: Context path= docBase=/home/tomcat/applications/ debug=0 reloadable=true /Context I restarted tomcat but with the same effect. Is there some other configuration that I have to modify to inform tomcat that I have a project in this folder? Michael. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Where to put context.xml?
Allistair Crossley wrote: Hi, The docBase is just the folder where your web applications are located. You need to have a folder in applications for your web application. For the empty path application this is /ROOT. Thus Context path=/ROOT docBase=/home/tomcat/applications/ debug=0 reloadable=true /Context Means a folder at /home/tomcat/applications/ROOT/META-INF/context.xml Thanks, it works now. I used your first method instead. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Where to put context.xml?
Caldarale, Charles R wrote: To again quote from the Tomcat doc for the path attribute of the Context element: The value of this field must not be set except when statically defining a Context in server.xml, as it will be infered [sic] from the filenames used for either the .xml context file or the docBase. Also note that placing Context tags is server.xml is strongly discouraged. OK, I took out /ROOT from the path field and it still works. But the context file must still be named ROOT.xml. The application fails to work with any other filename. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: ajp13 dies unexpectately
Just curious, what version of apache are you using? I am trying to get tomcat 3.2 to work with apache 2.0 but I couldn't compile mod_jk. It says something like it couldn't find http_global_conf.h. Regards, Michael. maarten hartsuijker wrote: we have been running tomcat 3.2.2 with apache, mod_jk and ajp13 support for about 3 weeks now. In those weeks it has died 2 times unexpectately and the only thing the mod_jk.og is showing me is a jk_ajp13_worker.c (586)]: Error connecting to the Tomcat process. With a netstat I can see that 8009 is not up anymore, so both times I have issued a shutdown and a start. That works but (ofcourse) I'd rather not have this problem at all. Anyone had this before and, better yet, found a solution? kind regards, Maarten Hartsuijker .
help with compiling mod_jk
Hi. I am trying to configure Apache(2.0.16) on my linux system (redhat 7.1) with tomcat (3.2). According to tomcat's documentation, I should try to compile my own mod_jk module by downloading the source for jakarta-tomcat. I downloaded it and then I ran the command as per documentation: apxs -o mod_jk.so -I../jk -I/usr/local/jdk/include -I/usr/local/jdk/include/linux -c *.c ../jk/*.c I have adjusted the java path accordingly so that it reflects $JAVA_HOME on my system. However when I ran this command, I get the following errors: libtool --silent --mode=compile gcc -pthread -I/usr/local/apache2/include -I../jk -I/usr/local/java/include -I/usr/local/java/include/linux -c mod_jk.c touch mod_jk.slo mod_jk.c:76:31: http_conf_globals.h: No such file or directory apxs:Break: Command failed with rc=65536 It says that it can't find the http_conf_globals.h file but I couldn't find it on my system even after doing a search. Please help. Thanks, Michael.
