[jbossseam-issues] [JBoss JIRA] Closed: (JBSEAM-2485) NoClassDefFound when a service bean interface is in an outside .jar

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