11:22 a.m.
NoClassDefFound when a service bean interface is in an outside .jar
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Key: JBSEAM-2485
URL: http://jira.jboss.com/jira/browse/JBSEAM-2485
Project: JBoss Seam
Issue Type: Bug
Affects Versions: 2.0.1.CR1, 2.0.0.GA
Environment: JBoss AS 4.2.2, 4.2.1, Seam 2.0.0.GA, 2.0.1.CR1
Reporter: Adam Warski
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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