[seam-issues] [JBoss JIRA] Updated: (JBSEAM-4727) DuplicateMemberException with Sessionbean components

DuplicateMemberException with Sessionbean components ---------------------------------------------------- Key: JBSEAM-4727 URL: https://jira.jboss.org/browse/JBSEAM-4727 Project: Seam Issue Type: Bug Affects Versions: 2.2.1.CR2 Environment: Tested with Seam 2.2.1.CR2 on Linux with JBoss AS 5.1.0.GA. Reporter: Martin Höller Attachments: seambug.tar.gz Under some circumstances a session bean that is made to a seam component throws DuplicateMemberExceptions on instantiation. The stacktrace is as follows: org.jboss.seam.InstantiationException: Could not instantiate Seam component: myBean at org.jboss.seam.Component.newInstance(Component.java:2170) at org.jboss.seam.Component.getInstance(Component.java:2024) at org.jboss.seam.Component.getInstance(Component.java:1986) at org.jboss.seam.Component.getInstance(Component.java:1980) 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:148) at org.jboss.seam.el.SeamELResolver.getValue(SeamELResolver.java:51) at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54) at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72) at org.jboss.el.parser.AstIdentifier.getValue(AstIdentifier.java:44) at org.jboss.el.parser.AstValue.getValue(AstValue.java:63) at org.jboss.el.parser.AstDeferredExpression.getValue(AstDeferredExpression.java:26) at org.jboss.el.parser.AstCompositeExpression.getValue(AstCompositeExpression.java:31) at org.jboss.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186) at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71) at javax.faces.component.UIOutput.getValue(UIOutput.java:184) at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:201) at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:284) at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:154) at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:861) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:937) at javax.faces.component.UIComponent.encodeAll(UIComponent.java:933) at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:594) at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100) at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266) 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$FilterChainImpl.doFilter(SeamFilter.java:83) at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:60) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90) at org.jboss.seam.servlet.SeamFilter$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.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:235) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70) 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:158) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330) at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:905) at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:592) at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:2036) at java.lang.Thread.run(Thread.java:619) Caused by: java.lang.RuntimeException: duplicate method: iterator in org.javassist.tmp.java.lang.Object_$$_javassist_seam_2 at org.jboss.seam.util.ProxyFactory.createClass3(ProxyFactory.java:355) at org.jboss.seam.util.ProxyFactory.createClass2(ProxyFactory.java:325) at org.jboss.seam.util.ProxyFactory.createClass(ProxyFactory.java:284) at org.jboss.seam.Component.createProxyFactory(Component.java:2452) at org.jboss.seam.Component.getProxyFactory(Component.java:1516) at org.jboss.seam.Component.wrap(Component.java:1507) at org.jboss.seam.Component.instantiateSessionBean(Component.java:1404) at org.jboss.seam.Component.instantiate(Component.java:1367) at org.jboss.seam.Component.newInstance(Component.java:2148) ... 61 more Caused by: javassist.bytecode.DuplicateMemberException: duplicate method: iterator in org.javassist.tmp.java.lang.Object_$$_javassist_seam_2 at javassist.bytecode.ClassFile.testExistingMethod(ClassFile.java:593) at javassist.bytecode.ClassFile.addMethod(ClassFile.java:577) at org.jboss.seam.util.ProxyFactory.override(ProxyFactory.java:672) at org.jboss.seam.util.ProxyFactory.overrideMethods(ProxyFactory.java:646) at org.jboss.seam.util.ProxyFactory.make(ProxyFactory.java:566) at org.jboss.seam.util.ProxyFactory.createClass3(ProxyFactory.java:346) ... 69 more The circumstances that trigger this bug seam to be as follos: * A seam component that is a session bean has two implement some interfaces * Two of the implemented interfaces have to override a method from a common super-interface while changing the return type I'll attch a demo-project that illustrates the problem. For this, I took the interface java.lang.Iterable which defines the method iterator() which returns java.util.Iterator. I created two interfaces each extending Iterable and overriding interator() with a modified return type (MyIterator). My component then implements both interfaces which triggers the bug. I hope I made myself clear enough. If not, please ask for details.