[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-2485) NoClassDefFound when a service bean interface is in an outside .jar
Andre Rodrigues (JIRA)
jira-events at lists.jboss.org
Mon Nov 24 19:28:36 EST 2008
[ https://jira.jboss.org/jira/browse/JBSEAM-2485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12439584#action_12439584 ]
Andre Rodrigues commented on JBSEAM-2485:
-----------------------------------------
This problem is still happening to me.
I have all my backing beans in the web application (java bean components). My business logic is inside EJBs in a module which has no reference to Seam whatsoever. So, the EAR class loader has no reference to Seam classes, Seam's jar are only in my web application (WEB-INF/lib).
After some debugging, I saw that seam (2.0.2.SP1) passes an Array of interfaces to the ProxyFactory class. ProxyFactory gets the ClassLoader from the first class in the array. When the first class in the array is either Proxy or Instance, everything works fine. When the EJB interface is the first element on the array (happens after a few restarts of JBoss), ProxyFactory gets its ClassLoader, the EAR ClassLoader, which, as metioned before, doesn't "know" about Seam.
I think a simple solution would be change the method createProxyFactory in the Component class to the following:
Set<Class> interfaces = new TreeSet<Class>(); // instead of a HashSet, to guarantee the order of the elements
// so these classes the first elements on the array
interfaces.add(Instance.class);
interfaces.add(Proxy.class);
if ( type.isSessionBean() )
{
interfaces.addAll(businessInterfaces);
}
else
{
interfaces.add(HttpSessionActivationListener.class);
interfaces.add(Mutable.class);
}
ProxyFactory factory = new ProxyFactory();
// excluding this part, which was included in 2.1.0, but didn't really solved the problem
/*{
@Override
protected ClassLoader getClassLoader()
{
return beanClass.getClassLoader();
}
};*/
> NoClassDefFound when a service bean interface is in an outside .jar
> -------------------------------------------------------------------
>
> Key: JBSEAM-2485
> URL: https://jira.jboss.org/jira/browse/JBSEAM-2485
> Project: Seam
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.0.0.GA, 2.0.1.CR1
> Environment: JBoss AS 4.2.2, 4.2.1, Seam 2.0.0.GA, 2.0.1.CR1
> Reporter: Adam Warski
> Assignee: Pete Muir
> Fix For: 2.1.0.BETA1
>
>
> My deployment is as follows:
> - MyApi.jar, which contains the local an interface for a stateless session bean
> - MyApp.ear, which is a normal Seam application, and has an implementation of the interface
> The api is in a separate jar so that I can use the SLSB in other applications.
> On some occasions, I got weird exceptions, like:
> Caused by: java.lang.RuntimeException: by java.lang.NoClassDefFoundError: org/jboss/seam/intercept/Proxy
> at org.jboss.seam.util.ProxyFactory.createClass(ProxyFactory.java:190)
> or
> Caused by: java.lang.RuntimeException: by java.lang.NoClassDefFoundError: org/jboss/seam/Instance
> at org.jboss.seam.util.ProxyFactory.createClass(ProxyFactory.java:190)
> (full example stack trace below).
> I think the reason is as follows:
> in org.jboss.seam.Component.createProxyFactory(...) - lines 2234-2254, a set of interfaces is created. It is a HashSet, so the first element may differ on each invocation of the method (that's why the exception is thrown only sometimes).
> This set contains both the business interfaces, as well as org/jboss/seam/Instance, org/jboss/seam/intercept/Proxy.
> Then, in org.jboss.seam.util.ProxyFactory.getClassLoader (lines 196-212) (which is invoked from the previously mentioned method), a classloader is obtained, which is later used to load all the interfaces classes and instantiate the proxy (in javassist). The classloader is taken to be the classloader of the first interface in the interfaces array (which is constructed from the set).
> So, the classloader may be that of:
> (1) the business interface
> (2) org/jboss/seam/Instance, org/jboss/seam/intercept/Proxy.
> If it is number (2), then it is the scoped classloader of the ear. However, if it is (1), then it is the unified class loader which was used to load the .jar, which contains the business interface. This classloader cannot load the org/jboss/seam/intercept/Proxy and org/jboss/seam/Component interfaces, as they are contained in a scoped deployment. Thus, an exception is thrown.
> A fix which I have right now is, in org.jboss.seam.Component.createProxyFactory:
> 1. replace HashSet with LinkedHashSet - then the first element will always be the same
> 2. move adding the org/jboss/seam/intercept/Proxy and org/jboss/seam/Component interfaces to the top, so that the scoped class loader is later obtained in org.jboss.seam.util.ProxyFactory.getClassLoader.
> I've tested it and it seems to fix the issue.
> And finally the promised stack trace:
> javax.el.ELException: /home.xhtml: Could not instantiate Seam component: serviceBean
> at com.sun.facelets.compiler.TextInstruction.write(TextInstruction.java:50)
> at com.sun.facelets.compiler.UIInstructions.encodeBegin(UIInstructions.java:39)
> at org.ajax4jsf.renderkit.RendererBase.renderChild(RendererBase.java:280)
> at org.ajax4jsf.renderkit.RendererBase.renderChildren(RendererBase.java:262)
> at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:199)
> at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:194)
> at org.ajax4jsf.renderkit.RendererBase.encodeChildren(RendererBase.java:121)
> at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:812)
> at javax.faces.component.UIComponent.encodeAll(UIComponent.java:886)
> at javax.faces.component.UIComponent.encodeAll(UIComponent.java:892)
> at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:592)
> at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:108)
> at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:216)
> at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
> at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
> at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
> at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
> at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
> at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
> at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
> at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:68)
> at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
> at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:85)
> at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
> at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
> at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
> at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
> at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
> at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:141)
> at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:281)
> at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:60)
> at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
> at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58)
> at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
> at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
> at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
> at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
> at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
> at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
> at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
> at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
> at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
> at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
> at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
> at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
> at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
> at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
> at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
> at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
> at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
> at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
> at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
> at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
> at java.lang.Thread.run(Thread.java:613)
> Caused by: org.jboss.seam.InstantiationException: Could not instantiate Seam component: serviceBean
> at org.jboss.seam.Component.newInstance(Component.java:1970)
> at org.jboss.seam.Component.getInstance(Component.java:1873)
> at org.jboss.seam.Component.getInstance(Component.java:1840)
> at org.jboss.seam.Namespace.getComponentInstance(Namespace.java:55)
> at org.jboss.seam.Namespace.getComponentInstance(Namespace.java:50)
> at org.jboss.seam.el.SeamELResolver.resolveBase(SeamELResolver.java:166)
> at org.jboss.seam.el.SeamELResolver.getValue(SeamELResolver.java:53)
> at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
> at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:64)
> at org.jboss.el.parser.AstIdentifier.getValue(AstIdentifier.java:44)
> at org.jboss.el.parser.AstValue.getValue(AstValue.java:63)
> at org.jboss.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
> at com.sun.facelets.el.ELText$ELTextVariable.writeText(ELText.java:184)
> at com.sun.facelets.el.ELText$ELTextComposite.writeText(ELText.java:108)
> at com.sun.facelets.compiler.TextInstruction.write(TextInstruction.java:45)
> ... 53 more
> Caused by: java.lang.RuntimeException: by java.lang.NoClassDefFoundError: org/jboss/seam/intercept/Proxy
> at org.jboss.seam.util.ProxyFactory.createClass(ProxyFactory.java:190)
> at org.jboss.seam.Component.createProxyFactory(Component.java:2260)
> at org.jboss.seam.Component.getProxyFactory(Component.java:1375)
> at org.jboss.seam.Component.wrap(Component.java:1366)
> at org.jboss.seam.Component.instantiateSessionBean(Component.java:1288)
> at org.jboss.seam.Component.instantiate(Component.java:1273)
> at org.jboss.seam.Component.newInstance(Component.java:1966)
> ... 67 more
> Caused by: javassist.CannotCompileException: by java.lang.NoClassDefFoundError: org/jboss/seam/intercept/Proxy
> at javassist.util.proxy.FactoryHelper.toClass(FactoryHelper.java:165)
> at org.jboss.seam.util.ProxyFactory.createClass(ProxyFactory.java:186)
> ... 73 more
> Caused by: java.lang.NoClassDefFoundError: org/jboss/seam/intercept/Proxy
> at java.lang.ClassLoader.defineClass1(Native Method)
> at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
> at sun.reflect.GeneratedMethodAccessor264.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:585)
> at javassist.util.proxy.FactoryHelper.toClass2(FactoryHelper.java:177)
> at javassist.util.proxy.FactoryHelper.toClass(FactoryHelper.java:159)
> ... 74 more
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