Internal Servlet error while running Java application

[vapocalypse]

Hi everybody, I'm having an "Internal Servlet Error" while running a Java application.
I don't know what is happening, but sometimes the execution stops at an exception (backtrace below).
We are using jakarta tomcat 3.3.1a. When it is restarted, the problem doesn't happen anymore in a while, when it happens again later, and we restart the server again and so on...
Does anyone here have an idea of what is going on? I suggested a version upgrade to see if the problem disappears. Should it work?

The server runs on Red Hat Advanced Server 2.1.

Here is the whole error message and backtrace:

Error: 500
Location: /desktop/SizingWizard/do_show_report.jsp
Internal Servlet Error:

java.lang.NoClassDefFoundError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:140)
at java.awt.Toolkit$2.run(Toolkit.java:712)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:703)
at automatos.reports.Cover.addImage(Cover.java:111)
at automatos.reports.covers.desktop.pcapcon.Cover.write(Cover.java:11)
at automatos.reports.desktop.Report.write(Report.java:73)
at automatos.reports.Report.generate(Report.java:115)
at automatos.desktop.cpl.do_pcapcon_5._jspService(do_pcapcon_5.java:505)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
at javax.servlet.http.HttpServlet.service(HttpServlet.java)
at org.apache.tomcat.facade.ServletHandler.doService(ServletHandler.java:574)
at org.apache.tomcat.core.Handler.invoke(Handler.java:322)
at org.apache.tomcat.core.Handler.service(Handler.java:235)
at org.apache.tomcat.facade.ServletHandler.service(ServletHandler.java:485)
at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:917)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:833)
at org.apache.tomcat.modules.server.Ajp12Interceptor.processConnection(Ajp12Interceptor.java:221)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:494)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:516)
at java.lang.Thread.run(Thread.java:536)

Thanks in advance.

Victor

 

[sedj]

>>>> java.lang.NoClassDefFoundError
You have a CLASSPATH error. In you file "desktop/SizingWizard/do_show_report.jsp" you are trying to invoke a class that Tomcat cannot locate. Check your environment variables, and make sure that custom classes are jar'ed and placed in TOMCAT_HOME/lib, or in TOMCAT_HOME/webapps/YourWebapp/WEB-INF/lib, or as bare class files in TOMCAT_HOME/webapps/YourWebapp/WEB-INF/classes.

Whether you should upgrade Tomcat or not is up to you - if you are running SDK1.4, I would upgrade to Tomcat 4.*, if running SDK1.3, I wouldn't.

 

[vapocalypse]

I know it looks like a CLASSPATH error, but it works with just a restart.
We are using SDK 1.4, I think its better to upgrade to Tomcat 4.
Thanks!