Compiling classes and restarting Tomcat

When making changes to any of my java classes I have to restart Tomcat in order for them to be made. Is this the only way to do it?

add this line to your server.xml in
<tomcat_install_dir>\conf directory
<DefaultContext reloadable="true"/>
if you have context path tag in this file for your
application, then add
the line to this tag as shown below
<Context reloadable="true"....</Context>
This will automatically load classes
This should really only be done in a development environment (but by all means DO use it in a development environment). In a production environment, with lots of simultaneous users, it has a pretty big impact on performance.
- K

Similar Messages

Load the compiled class and deploy programmatically

so, i am making a compiler,
the compilation part is using java compiler api
i want to ask, is there any api to run the generated class
and is there any api to deploy it??
or is it a must to use Runtime.getRuntime().exec ?
thanks

In outline it's pretty easy. The URLClassLoader can load classes from either .jar files and class directories. For dynamic class generation it's not worth using the .jar format, compile into a directory.
Then you just need to create a URLClassLoader using a file: type URL poiting to the base class directory (packages are represented as nested directories inside.)
File classDir = ......
ClassLoader cl = new URLClassLoader(new URL[]{classDir.toURL()});
Class loadedClass = cl.loadClass(className);Some complications:
This will not load the dynamic class if there's a class with the same name and package on the class path.
Having loaded a class, you need to know how to use it. Typically you create an instance with newInstance() and cast it to some interface that these classes are supposed to implement (and which is on the class path).

How to compile class and package

I am trying to compile the following 3 files.
http://www.cs.umbc.edu/~stephens/crypto/CIPHERS/ElGamal.java
http://www.cs.umbc.edu/~stephens/crypto/CIPHERS/BinaryHeap.java
http://www.cs.umbc.edu/~stephens/crypto/CIPHERS/DLP.java
I tried compiling them with a variety of ways but still cannot figure out the correct way of doing it.

I finally figured out how to compile them. I had to change files so that I don't have to compile with a package.
Message was edited by:
webweaver

How can i avoid restarting tomcat server when servlet is modified?

please advice me that how can i avoid restarting the tomcat server, whenever a servlet file is modified in my application. is their any way ?

No probs. Here's how I do things...
1. Install tomcat as normal (e.g. I install to C:\Apps\jakarta-tomcat-5.5.4)
2. Create a webapps directory in your eclipse project with the following directory structure
MyEclipseProject
   - src
   - conf
   - webapps
      - MyApplication
         - META-INF
         - WEB-INF
            - classes
            - lib
            - pages3. Set the project's output folder (e.g. bin folder) to webapps/MyApplication/WEB-INF/classes
4. Put all your jar files in the lib directory
5. Put JSPs / HTML in the pages directory (you may also want to create additional directories for TLDs, config files etc)
6. Ensure your web.xml is in the WEB-INF directory
7. Although it isn't essential I create a context.xml file and store it in META-INF, e.g.
<Context reloadable="true">
    
     <WatchedResource>WEB-INF/web.xml</WatchedResource>
     <WatchedResource>WEB-INF/conf/struts/struts-config.xml</WatchedResource>
     <WatchedResource>WEB-INF/conf/struts/tiles-defs.xml</WatchedResource>
     <WatchedResource>WEB-INF/conf/struts/validation.xml</WatchedResource>
</Context>I use this to set monitored resources that will trigger an automatic appliation reload and to configure JAAS (not shown). See the Tomcat documentation for additional information.
8. In the 'conf' directory I create a server.xml file used to configure Tomcat (you can copy the one from your <TOMCAT_HOME>/conf/server.xml).
After copying the file change appBase attribute in the host element to be the full path to the webapps directory. You can also change the HTTP and HTTPS ports if you wish
9. Download and install the Tomcat Launcher plugin from Sysdeo.
10. In Eclipse's Preferences menu you will see a new entry for Tomcat. Click this then
a. Set your Tomcat Version
b. Set your Tomcat Home
c. Set "Context declaration mode" to server.xml
d. Set the configuration file to the full path to your server.xml file created in step 8
On the "Advanced " sub page select all relevant projects to add to the Tomcat classpath
On the "JVM Settings" page add all the jars in your WEB-INF lib directory to the class path
On the "Source Path" page select all relevant projects
Now if you start Tomcat using the Tomcat icon, you will be able to remote debug your application. If you change web.xml (or any other file in your context.xml watched resources) it will automatically reload. Any changes to JSPs will automatically be picked up (providing your tell your browser not to use the page in cache - e.g. CTRL+F5 in IE)
There are some limitations that I'm still working on however. Primarily that I haven't included the Tomcat Manager application in my webapps directory, so Sysdeo cannot perform a reload. This means that if I change a source file, and eclipse auotmatically rebuilds, Tomcat doesn't pick up the change unless I either change a watched resource file (e.g. web.xml) or stop and restart Tomcat.
There's no reason why this can't be fixed, I just haven't got round to it yet.
I'm sure there are lots of other (probably better) ways of achieving the same thing. This was the first method I tried and it worked, so I stuck with it. I'm not a Tomcat config guru and I'm sure other forum users could provide some improvements should they wish.
Post if you get into trouble, however I won't be able to respond until next week.
Cheers,
Steve

Restart tomcat at every servlet modify?

Hi,
I'm using tomcat 5.5 and working on some servlets, but when I execute a servlet (http://localhost/my_servlet)
and then I modify and recompile it, I have to shutdown and restart tomcat to see the new version on work.
Is this normal? Can I avoid this?
Thanx

Well, I have solved the problem editing contex.wml file modifying the line:
<Context>into the line:
<Context reloadable="true">Now it works even if refresh time is not so low...
Thanx to all.
P.S.
Adding the line
<DefaultContext reloadable="true"/>into server.xml file I don't have obtained any result.

Unable to compile class for JSP. apache-tomcat-6. What could be wrong?

Hello, I am new to JSP and I am trying a very basic jsp and class file on Windows XP. I get the Unable to compile class for JSP.
Steps that I have done:
javac ch06_01.java , placed the ch06_01.class under
C:\Apps\apache-tomcat-6.0.16\webapps\ch06\WEB-INF\classes
Then grabbed the ch06_02.jsp and placed it under
C:\Apps\apache-tomcat-6.0.16\webapps\ch06\
When I run it (by placing this into Explorer or Firefox URL
http://localhost:8080/ch06/ch06_02.jsp) I get the error further
below. Things I have done and made sure they are in place are:
set up JAVA_HOME to C:\Apps\jdk1.6.0_06
Using CATALINA_BASE: C:\Apps\apache-tomcat-6.0.16
Using CATALINA_HOME: C:\Apps\apache-tomcat-6.0.16
Using CATALINA_TMPDIR: C:\Apps\apache-tomcat-6.0.16\temp
Using JRE_HOME: C:\Apps\jre1.6.0_06
I did a google on the error and I found people saying to place the
tools.jar from the jsk into the lib directory under CATALINA_HOME. But
the examples still don't work. What step could I be missing? Your help is greatly
appreciated.
This is the simple jsp file:
<%@ page import="ch06_01" %>
<HTML>
<HEAD>
<TITLE>Using a JavaBean</TITLE>
</HEAD>
<BODY>
<H1>Using a JavaBean</H1>
<% ch06_01 messager = new ch06_01(); %>
The message is: <%= messager.msg() %>
</BODY>
</HTML>
this is the simple ch6_01 java file:
public class ch06_01
public ch06_01()
public String msg()
return "Hello from JSP!";
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented
it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSP:
An error occurred at line: 6 in the generated java file
The import ch06_01 cannot be resolved
An error occurred at line: 9 in the jsp file: /ch06_02.jsp
ch06_01 cannot be resolved to a type
6: <BODY>
7: <H1>Using a JavaBean</H1>
8:
9: <% ch06_01 messager = new ch06_01(); %>
10:
11: The message is: <%= messager.msg() %>
12:
An error occurred at line: 9 in the jsp file: /ch06_02.jsp
ch06_01 cannot be resolved to a type
6: <BODY>
7: <H1>Using a JavaBean</H1>
8:
9: <% ch06_01 messager = new ch06_01(); %>
10:
11: The message is: <%= messager.msg() %>
12:
Stacktrace:
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:423)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:316)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:294)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:281)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
Edited by: indikon1 on Jun 12, 2008 1:18 PM
I just updated the directories of the variables to reflect the current status of my system.

What is wrong is that you are using an "old" jsp tutorial :-)
Since Java 1.4, JSPs have been unable to access classes in the "default" package.
What you need to do:
Put the java class ch06_01 in a package.
Steps to do this
- Edit ch06_01 and add the following to the very top of the file (without the quotes): "package mypackage;"
- create a folder "mypackage"
- move ch06_01.java into that folder
- compile that class (now in the mypackage package)
- place ch06_01.class under C:\Apps\apache-tomcat-6.0.16\webapps\ch06\WEB-INF\classes\mypackage
In your jsp:
<%@ page import="mypackage.ch06_01" %>
I would suggest using a more up-to-date tutorial that uses JSTL.
Take a look at this [Apache Tomcat tutorial|http://www.coreservlets.com/Apache-Tomcat-Tutorial/index.html]

Tomcat 4.1 Bean error (Unable to compile class for JSP)

Help,
I am using Tomcat 4.1 with with JDK1.3.1_01. I have a JSP page in which I try to use a Bean, but I get the following error from Tomcat.
The JSP page is very simple. I am using package names in the import statement. Code below.
I've put the class files under
<TOMCAT>\webapps\projectname\WEB-INF\classes under the appropriate packages. What else is missing? I can not figure out what I am doing wrong.
***************** START JSP CODE *********************
<html>
<head>
<title>User Information</title>
</head>
<%@ page session="true" %>
<%@ page import="com.xxx.yyy.data.*" %>
<body>
<P> </P>
<P> </P>
<P> </P>

<%
     User user = (User) session.getAttribute("user");
%>
UserID = <%= user.getUserID() %><BR>
User Name = <%= user.getUserName() %><BR>
Password = <%= user.getPassword() %><BR>
Password Hint = <%= user.getPasswordHint() %><BR>
</body>
</html>
***************** END JSP CODE *********************
***************** START TOMCAT ERROR MESSAGE *********************
org.apache.jasper.JasperException: Unable to compile class for JSP
     at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:477)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:182)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:289)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:260)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2397)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:171)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:405)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:380)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:508)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:533)
     at java.lang.Thread.run(Thread.java:536)
root cause
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 20 in the jsp file: /userInfo.jsp
Generated servlet error:
[javac] Compiling 1 source file
D:\Apache_Group\Tomcat_4.1\work\Standalone\localhost\PALBO\userInfo_jsp.java:7: package com.xxx.yyy.data does not exist
import com.xxx.yyy.data.*;
^
D:\Apache_Group\Tomcat_4.1\work\Standalone\localhost\PALBO\userInfo_jsp.java:61: package com.xxx.yyy.data does not exist
com.xxx.yyy.data.User user = null;
^
An error occurred at line: 20 in the jsp file: /userInfo.jsp
Generated servlet error:
D:\Apache_Group\Tomcat_4.1\work\Standalone\localhost\PALBO\userInfo_jsp.java:63: package com.xxx.yyy.data does not exist
user = (com.xxx.yyy.data.User) pageContext.getAttribute("user", PageContext.SESSION_SCOPE);
^
An error occurred at line: 20 in the jsp file: /userInfo.jsp
Generated servlet error:
D:\Apache_Group\Tomcat_4.1\work\Standalone\localhost\PALBO\userInfo_jsp.java:66: package com.xxx.yyy.data does not exist
user = (com.xxx.yyy.data.User) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "com.xxx.yyy.data.User");
^
An error occurred at line: 25 in the jsp file: /userInfo.jsp
Generated servlet error:
D:\Apache_Group\Tomcat_4.1\work\Standalone\localhost\PALBO\userInfo_jsp.java:77: cannot resolve symbol
symbol : class User
location: class org.apache.jsp.userInfo_jsp
     User user = (User) session.getAttribute("user");
^
An error occurred at line: 25 in the jsp file: /userInfo.jsp
Generated servlet error:
D:\Apache_Group\Tomcat_4.1\work\Standalone\localhost\PALBO\userInfo_jsp.java:77: cannot resolve symbol
symbol : class User
location: class org.apache.jsp.userInfo_jsp
     User user = (User) session.getAttribute("user");
^
6 errors
     at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:120)
     at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:293)
     at org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:315)
     at org.apache.jasper.compiler.Compiler.compile(Compiler.java:326)
     at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:474)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:182)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:289)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:260)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2397)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:171)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:405)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:380)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:508)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:533)
     at java.lang.Thread.run(Thread.java:536)
***************** END TOMCAT ERROR MESSAGE *********************

Hi
I am running my Tomcat apps (on a Windows dev machine) in an alternate location (ie. not default webapps). The same crap comes to me every time. Unable to install etc. I have tried every trick in the book regarding classpath settings etc.
When I use 'javap' to check the classpath from any location on my machine, its works and javap returns the signature of my class.
When I use it though Tomcat (with the import set to include the filename), it get the error. I have heard rumors that using JDK 1.3 in stead of 1.4 helps, but I just want it to work with 1.4 :)
So if any of you can help me on this, please.
PS. On my linux server it works just fine, as does every other thing on that machine ;)
Chris (chris.schuit <at> euronet.nl)

Unable to compile class for JSP in tomcat

Hi
I developed an application. it works Ok in embedded OC4J server. But I get the following error when I deployed to tomcat server :
org.apache.jasper.JasperException: Unable to compile class for JSP
     org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)
     com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:322)
     com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:130)
     oracle.adfinternal.view.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:157)
     com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
     com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
     com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
     javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
     oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl._invokeDoFilter(AdfFacesFilterImpl.java:367)
     oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl._doFilterImpl(AdfFacesFilterImpl.java:336)
     oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl.doFilter(AdfFacesFilterImpl.java:196)
     oracle.adf.view.faces.webapp.AdfFacesFilter.doFilter(AdfFacesFilter.java:87)
     oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:332)
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)
I followed the steps of deploying exactly as Oracle developer guide and I don't know what is the reason of this error
please how can I solve this problem

Hi
16-Jan-2007 04:09:17 org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet Faces Servlet threw exception
Compile failed; see the compiler error output for details.
at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:933)
at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:757)
at org.apache.jasper.compiler.AntCompiler.generateClass(AntCompiler.java:219)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:297)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:276)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:264)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:303)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:322)
at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:130)
at oracle.adfinternal.view.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:157)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl._invokeDoFilter(AdfFacesFilterImpl.java:367)
at oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl._doFilterImpl(AdfFacesFilterImpl.java:336)
at oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl.doFilter(AdfFacesFilterImpl.java:196)
at oracle.adf.view.faces.webapp.AdfFacesFilter.doFilter(AdfFacesFilter.java:87)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:332)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)

Using javabean in tomcat(unable to compile class)

Hello, I am using jakarta-tomcat-5.0.28, OS:WinXP
I am getting the following error when i use javabean in tomcat (the example is executed just fine in another web server:Blazix)
I am very new to this (JSP, Servlets and tomcat) so any help would be greatly appreciate.
THE ERROR IS:
==============================================================
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 1 in the jsp file: /SaveName.jsp
Generated servlet error:
C:\Programs\internet\jakarta-tomcat-5.0.28\work\Catalina\localhost\JSPSession\org\apache\jsp\SaveName_jsp.java:42: cannot resolve symbol
symbol : class UserData
location: class org.apache.jsp.SaveName_jsp
UserData user = null;
^
An error occurred at line: 1 in the jsp file: /SaveName.jsp
Generated servlet error:
C:\Programs\internet\jakarta-tomcat-5.0.28\work\Catalina\localhost\JSPSession\org\apache\jsp\SaveName_jsp.java:44: cannot resolve symbol
symbol : class UserData
location: class org.apache.jsp.SaveName_jsp
user = (UserData) jspxpage_context.getAttribute("user", PageContext.SESSION_SCOPE);
^
An error occurred at line: 1 in the jsp file: /SaveName.jsp
Generated servlet error:
C:\Programs\internet\jakarta-tomcat-5.0.28\work\Catalina\localhost\JSPSession\org\apache\jsp\SaveName_jsp.java:46: cannot resolve symbol
symbol : class UserData
location: class org.apache.jsp.SaveName_jsp
user = new UserData();
^
3 errors
     org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
     org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:332)
     org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:412)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
     org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.
===============================================================
ERROR END
I use the folowing files:
GetName.html
SaveName.jsp
NextPage.jsp
UserData.java
My Dir Structure is:
/JSPSession
    GetName.html
     SaveName.jsp
     NextPage.jsp
   /WEB-INF
      /classes
         UserData.java
         UserData.class
   /libThe Code for the files is:
GetName.html
<HTML>
<BODY>
<FORM METHOD=POST ACTION="SaveName.jsp">
What's your name? <INPUT TYPE=TEXT NAME=username SIZE=20><BR>
What's your e-mail address? <INPUT TYPE=TEXT NAME=email SIZE=20><BR>
What's your age? <INPUT TYPE=TEXT NAME=age SIZE=4>
<P><INPUT TYPE=SUBMIT>
</FORM>
</BODY>
</HTML>---------------------------------------------------------------------------------------------------
SaveName.jsp
<jsp:useBean id="user" class="UserData" scope="session"/>
<jsp:setProperty name="user" property="*"/>
<HTML>
<BODY>
<A HREF="NextPage.jsp">Continue</A>
</BODY>
</HTML>-----------------------------------------------------------------------------------------------------
NextPage.jsp
<jsp:useBean id="user" class="UserData" scope="session"/>
<HTML>
<BODY>
You entered<BR>
Name: <%= user.getUsername() %><BR>
Email: <%= user.getEmail() %><BR>
Age: <%= user.getAge() %><BR>
</BODY>
</HTML>------------------------------------------------------------------------------------------------------------
UserData.java
public class UserData {
    String username;
    String email;
    int age;
    public void setUsername( String value ) {
        username = value;
    public void setEmail( String value ) {
        email = value;
    public void setAge( int value ) {
        age = value;
    public String getUsername() { return username; }
    public String getEmail() { return email; }
    public int getAge() { return age; }
}

A very common question. Tomcat dislikes classes which are not packaged. So, add a package statement in your UserBean.java
package beans; // or something like thatand then place the compiled class file UserBean.class into WEB-INF/classes/beans.
Put the import statement into the JSP accordingly and try again.
***Annie***

Compiler API and Tomcat

Hi!
I am using the new compiler api to compile dynamically generated classes.
To get the compiler tool i call:
JavaCompiler compilerTool = ToolProvider.getSystemJavaCompiler(); when I run this from eclipse with the integrated tomcat everyhing works fine but if I deploy the application on the external tomcat i get a null pointer exception because getSystemJavaCompiler(); always returns null.
Somebody got an idea why?

sigh, NEVER put ANYTHING in the jre/lib/ext directory.
It's a bad thing that it's even there, as it causes systems to become mutually incompatible and to behave unpredictably when different versions of classes are needed/present.
The compiler API (and others) that depend on the local filesystem are disallowed by application servers for security reasons.
You've just given access to every cracker in the world to your system by allowing them to compile and run code on your machine with root privileges. Your boss will thank you.

Classes and JSPs in Tomcat-4.1.24

Where to put the class files and how to call them in the jsps in Tomcat-4.1.24.
<br>In Tomcat-3.2.4 I used to put them in WEB-INF/classes and call them. The same jsp's working in Tomcat-3.x are not working in 4.1.24 version. Any idea???
Thanx in advance

Apparently tomcat4.1 requires all class files to be in a package so class files that you just had in WEB-INF/classes need to be re-compiled into packages.
Then you will need to import these classes into your jsp with a
<%@ page import= ..../> statement

How to pre-compile jsp and deploy to tomcat

Hi All,
I wuld like to know how to pre-compile JSPs and deploy to tomcat. I am using ANT tool to build and deploy the war file.
Thanks in Advance.
Regards,
--Nagesh.

for Tomcat 5.0 (You'll need to edit to fit your needs)
    <path id="jsp.classpath">
        
        <fileset dir="C:\tomcat\common\lib">
            <include name="**/*.jar"/>
        </fileset>
        <fileset dir="C:/tomcat/common/endorsed">
            <include name="**/*.jar"/>
        </fileset>
    </path>
    <target name="jsp" >
    
    <taskdef name="jspc50" classname="org.apache.jasper.JspC">
        <classpath>
                <path refid="jsp.classpath"/>
        </classpath>
    </taskdef>
    <jspc50 outputDir="${build.classes}"
            package="jsp"
            uriroot="${project.dir}/web/webApp"
            webXmlFragment="c:/web.xml"
            verbose="9"
            validateXml="false">
    </jspc50>
    <javac srcdir="${build.classes}/jsp"
           destdir="${build.classes}"
           debug="true"
           optimize="false"
           includes="**/*.java"
           source="1.4">
            <classpath>
                <path refid="classpath"/>
                <path refid="jsp.classpath"/>
            </classpath>
    </javac>
</target>    More information can be found here :
http://www.onjava.com/pub/a/onjava/excerpt/AntTDG_chap8/index1.html?page=last

Compiling Nested Classes and Interfaces

I am looking for documentation about compiling nested classes and interfaces. I have found something in the JVM Specification, but there does not explain how a nested class is compiled and what is included in the top level class to mark a "place holder" to the nested class. The JVM Specification in this topic cite the web page http://java.sun.com/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc.html that does not exists any more.
My root problem is that: I am compiling a class with a private nested class, but in the class file generated TopLevelClass$NestedClass.class the class does not have the private modifier. So I am not understanding why the "private" modifier was removed during compilation.
I performed the same test with a protected nested class and the result was the nested class with the public modifier. So I am not understanding why the "protected" modifier was changed to "public".
Thanks in advance,
Mardoqueu.

This should not be happening. What compiler are you using? If it's a reasonably recent Sun compiler, could you post a minimal example?

*Added* code to existing source file, compiled it, and class file shrunk

Another newbie here. Fortunately, my classpath is ok, so I'm able to compile a .java file.
I added one line of code (System.out.println) to write the value of a variable to a log. After compiling with javac, I noticed that the resulting [new] class file was smaller than the existing class file. I looked at each of the class files with Textpad. It's gibberish, but I quickly saw that a large block of code was missing in the new class file, even though the size of the source file had been increased.
There is a difference, however, between how the two class files were created. The existing class file was compiled (along with many others) by exporting an .EAR file from a development environment (WSAD) to the WebSphere Administrator Console. Conversely, I am now compiling the same source file with javac on my machine.
I suspect that this is the reason why I can add code to a .java file, compile it, and have the resulting class file actually lose code. Even if I am correct, I don't know what to do about it.
Does anyone have an idea?
Regards,
Daniel T.

Thank you both for your replies. I've read many posts over the past few months, and I know how important it is to provide as much info as possible, when asking a question here. That said, I have another tasty tidbit...
After replacing the existing (larger) class file with the new (smaller) class file, my application now produces this:
"*Error 500: LinkageError while defining class*..." [name of class]
*"...(Unsupported major.minor version 50.0) This is often caused by having a class defined at multiple locations within the classloader hierarchy. Other potential causes include compiling against an older or newer version of the class that has an incompatible method signature. Dumping the current context classloader hierarchy: ==> indicates defining classloader ==>[0] com.ibm.ws.classloader.CompoundClassLoader@6bd156d5 Local ClassPath:"*
...[the entire classpath]...
Original exception--- java.lang.UnsupportedClassVersionError:
I'm guessing that my focus should mostly be on the 'Original exception', and maybe I need to revisit the JRE or JDK or JVM (these terms are somewhat nebulous to me, so please forgive me using them interchangeably) on my machine. For now, I'll just keep trying stuff. Thanks again for the replies!
Regards,
Daniel T.

Jakarta-tomcat-4.1.31 unable to compile class in jsp

anyone??solve tis ploblem
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 0 in the jsp file: /DirList/toggle.jsp
Generated servlet error:
[javac] Compiling 1 source file
C:\jakarta-tomcat-4.1.31\work\Standalone\localhost\_\DirList\toggle_jsp.java:41: package hansen.playground does not exist
hansen.playground.MyFileStructureExplorer file = null;
^
An error occurred at line: 0 in the jsp file: /DirList/toggle.jsp
Generated servlet error:
C:\jakarta-tomcat-4.1.31\work\Standalone\localhost\_\DirList\toggle_jsp.java:43: package hansen.playground does not exist
file = (hansen.playground.MyFileStructureExplorer) pageContext.getAttribute("file", PageContext.SESSION_SCOPE);
^
An error occurred at line: 0 in the jsp file: /DirList/toggle.jsp
Generated servlet error:
C:\jakarta-tomcat-4.1.31\work\Standalone\localhost\_\DirList\toggle_jsp.java:46: package hansen.playground does not exist
file = (hansen.playground.MyFileStructureExplorer) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "hansen.playground.MyFileStructureExplorer");
^
3 errors
     at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:85)
     at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:248)
     at org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:315)
     at org.apache.jasper.compiler.Compiler.compile(Compiler.java:328)
     at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:427)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:142)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:240)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:187)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:200)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:209)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:144)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
     at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2358)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:133)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
     at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:118)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:127)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
     at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:152)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
     at java.lang.Thread.run(Thread.java:534)

it seems the u have not set the classpath properly for the above mentioned package...or else u have not compiled the java file..
by the way where is ur package put up currently (the directory heirarchy)?? find out whether u have included the import package statements in the java files...
do mention the directory structure of the packages...
cheers,
vini

Compiling classes and restarting Tomcat

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