You can assume it's "placed in a jar file under WEB-INF/lib" :-)
The thing is, I have a feeling it has nothing to do with the actual
class not being found. Because it finds it when another page loads
first, or when the jsp's generated class file is deleted and recreated,
and nothing in the class/jar/jsp locations changes in the meanwhile. If
it really couldn't find it, it wouldn't find it in any of the scenarios
where it does work, no?
Further, if tomcat follows the javadocs for NoClassDefFoundError, it
means "The searched-for class definition existed when the currently
executing class was compiled, but the definition can no longer be
found." So I think it finds it with no problem, compiles the jsp class
(the index_jsp.class file is indeed created), but then, and only
sometimes, it goes missing again moments later during runtime.
Unfortunately I don't know enough about the tomcat compiling and
classloading mechanisms to understand what's really going on here...
Amichai
Martin Gainty wrote:
where is the code web.SessionBean.java compiled to?
can we assume you compiled it to
/WEB-INF/classes/web/SessionBean.class
?
Martin Gainty
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> Date: Wed, 24 Jun 2009 22:03:13 +0300
> From: amich...@amichais.net
> To: users@tomcat.apache.org
> Subject: Bizarre NoClassDefFoundError
>
> Hi everyone!
>
>
> I'm running a stock tomcat 6 (6.0.18-0ubuntu6.1) on kubuntu Jaunty
amd64
> and Sun JDK (1.6.0_13-b03) , with a website consisting of several jsps,
> some of which make use of a POJO session bean, placed in a jar file
> under WEB-INF/lib.
>
>
> I'm encountering a very strange error, in the form of a
> NoClassDefFoundError (pasted fully below). Related scenario:
>
>
> 1. It happens only on one of the pages, which happens to be the main
> index.jsp.
> 2. It happens only when this page is the first to be accessed after a
> restart. If any other page is accessed before it, everything is ok.
> 3. After the first error shows up, hitting refresh causes the error to
> repeat, however the stack trace is slightly different: the "Caused by"
> section disappears (and the top part remains the same).
> 4. After the error shows up, if the index_jsp.class file under tomcat's
> work directory is deleted and the page refreshed - everything is ok.
> 5. It happens consistently after every restart (either reboot, or
> /etc/init.d/tomcat6 restart).
> 6. It happens consistently also after deleting the entire tomcat work
> folder for this hostname.
> 7. Nothing else changes between the tests afaik - jsps, configuration
> etc. remain untouched.
>
> Any ideas?
>
>
>
> The full stacktrace:
>
>
> java.lang.NoClassDefFoundError: web/SessionBean
>
> at org.apache.jsp.index_jsp._jspService(index_jsp.java:69)
> at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
> at
>
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
> at
> org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
> at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
>
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
>
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
> at
> org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276)
> at
>
org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:162)
> at
>
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:283)
> at
>
org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:56)
> at
>
org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:189)
> at java.security.AccessController.doPrivileged(Native Method)
> at
>
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)
> at
>
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
> at
>
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
> at
>
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
> at
>
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
> at
>
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:568)
> at
>
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
> at
>
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
> at
>
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
> at
>
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
> at
> org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
> at java.lang.Thread.run(Thread.java:619)
> Caused by: java.lang.ClassNotFoundException: web.SessionBean
> at
>
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1387)
> at
>
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
> at
> org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:128)
> at
> org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:66)
> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
> ... 32 more
>
>
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