NoClassDefFoundError occured on a class file that DOES exist

layman Jul 14, 2004 5:16 AM

Hello all,
I am working on a Web application on Jboss 3.2.4. JBoss reports NoClassDefFoundError on class com/embisoft/dvb/user/DVBUser,
which stays in a jar file under WEB-INF/lib.
I'v double checked the jar file, and sure that the class file is just fine.
the problem doesn't occurs all the time, after several attempts of ant clean, dist and war deploy, sometime the problem disappears.
Any idea ?
Thanks in advance.

Root cause
java.lang.NoClassDefFoundError: com/embisoft/dvb/server/DVBUser
com.embisoft.dvb.server.actions.LoginAction.login2(LoginAction.java:134)
com.embisoft.dvb.server.actions.LoginAction.execute(LoginAction.java:108)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
com.embisoft.dvb.server.filter.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:170)

1. Re: NoClassDefFoundError occured on a class file that DOES e

jae77 Jul 14, 2004 2:30 PM (in response to layman)

does this class extend another class that hasn't been deployed? i've seen this type of behavior when a class is extending another class, but the class that is being extended hasn't been deployed.
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2. Re: NoClassDefFoundError occured on a class file that DOES e

rzanner Jul 16, 2004 2:56 AM (in response to layman)

Hi layman,

maybe I'm wrong here but as far as I can see, the class you said is under WEB-INF/lib and the class JBoss is reporting are different:

"layman" wrote:

...

class com/embisoft/dvb/user/DVBUser,
which stays in a jar file under WEB-INF/lib.

...

java.lang.NoClassDefFoundError: com/embisoft/dvb/server/DVBUser

...

Cheers,

René
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