ServletException: java.lang.IncompatibleClassChangeError

[Łukasz Budnik <lu...@gmail.com>]

Hi All!

I'm using Tomcat 6.0.14 with MyFaces 1.2.2, Tomahawk 1.1.7-SNAPSHOT
and JSTL 1.2.

I'm trying to run a simple application, but I keep getting weird exceptions.

Apache Tomcat is a clear installation (downloaded and unzipped), there
are no shared libraries, in CATALINA_HOME there are only libraries
that were originally shipped with Tomcat.

My web apps WEB-INF/lib directory contains following libraries:

commons-beanutils-1.7.0.jar
commons-codec-1.3.jar
commons-collections-3.2.jar
commons-digester-1.8.jar
commons-discovery-0.4.jar
commons-el-1.0.jar
commons-fileupload-1.1.1.jar
commons-logging-1.1.1.jar
jstl-1.2.jar
myfaces-api-1.2.2.jar
myfaces-extensions-1.0.9.jar
myfaces-impl-1.2.2.jar
tomahawk-1.1.7-SNAPSHOT.jar

and this configuration causes the following error:
java.lang.IncompatibleClassChangeError.

for me it looks like the class loader has two different versions of
the same class,
but unfortunately id does not says which one is causing this error.

hints are most welcome!

best regards
Łukasz

this is full stack trace of this exception:

SEVERE: Servlet.service() for servlet Faces Servlet threw exception
java.lang.IncompatibleClassChangeError: Implementing class
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
	at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1817)
	at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:872)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1325)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
	at java.lang.Class.getDeclaredConstructors0(Native Method)
	at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
	at java.lang.Class.getConstructor0(Class.java:2699)
	at java.lang.Class.newInstance0(Class.java:326)
	at java.lang.Class.newInstance(Class.java:308)
	at org.apache.myfaces.config.annotation.TomcatAnnotationLifecycleProvider.newInstance(TomcatAnnotationLifecycleProvider.java:45)
	at org.apache.myfaces.config.ManagedBeanBuilder.buildManagedBean(ManagedBeanBuilder.java:81)
	at org.apache.myfaces.el.unified.resolver.ManagedBeanResolver.createManagedBean(ManagedBeanResolver.java:196)
	at org.apache.myfaces.el.unified.resolver.ManagedBeanResolver.getValue(ManagedBeanResolver.java:162)
	at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
	at org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.access$301(FacesCompositeELResolver.java:46)
	at org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver$4.invoke(FacesCompositeELResolver.java:108)
	at org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.invoke(FacesCompositeELResolver.java:148)
	at org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:104)
	at org.apache.myfaces.el.VariableResolverImpl.resolveVariable(VariableResolverImpl.java:61)
	at org.apache.myfaces.el.convert.VariableResolverToELResolver.getValue(VariableResolverToELResolver.java:93)
	at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
	at org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.access$301(FacesCompositeELResolver.java:46)
	at org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver$4.invoke(FacesCompositeELResolver.java:108)
	at org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.invoke(FacesCompositeELResolver.java:148)
	at org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:104)
	at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:45)
	at org.apache.el.parser.AstValue.getValue(AstValue.java:86)
	at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
	at org.apache.myfaces.el.convert.ValueExpressionToValueBinding.getValue(ValueExpressionToValueBinding.java:160)
	at org.apache.myfaces.custom.tree2.UITreeData.getValue(UITreeData.java:229)
	at org.apache.myfaces.custom.tree2.HtmlTreeRenderer.encodeChildren(HtmlTreeRenderer.java:159)
	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:543)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:239)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:246)
	at org.apache.myfaces.application.jsp.JspViewHandlerImpl.actuallyRenderView(JspViewHandlerImpl.java:423)
	at org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHandlerImpl.java:380)
	at org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:41)
	at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:140)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:152)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:445)
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
	at org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:694)
	at org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:665)
	at org.apache.jsp.index_jsp._jspService(index_jsp.java:54)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	at java.lang.Thread.run(Thread.java:619)