Well I've figured out a way around this problem but I can't for the life
of me explain why it eliminates the problem. This may even be a problem
in CGLib but this work around at least avoids it for now.
It seems to be a problem with the selection of the class loader.
Here's the class/interface configuration with the problem:
- We currently have defined 2 interfaces that both extend from a common
interface (say A and B that extend from Z). An implementation
class(IA) implements one of the interfaces(A). Another implementation
class(IB) extends IA and implements B.
- When we attempt to create a proxy for the GBean object, we get the
NoClassDefFoundError exception in the original post while attempting to
load the interface A.
I took a look at Jetty(which isn't hitting this problem) and the only
difference appeared to be another interface(C) that is in the same
package as B between the interface B and the class IB (which is really
strange because A was the interface pointed to by the error ... not B).
After rebuilding I no longer get the NoClassDefFoundError exception.
Anybody have an explanation or theory on this?
Does somebody with more experience on CGLib think it's likely a problem
there?
Joe Bohn wrote:
I'm trying to fix a problem with in the web console where it is supposed
to list the connections ... but instead gets an error (at the bottom of
this note).
It seems to be a problem actually generating the proxy for the class and
I lose touch of things when it gets into cglib.
In short ... here is the scenario:
- Discover via the KernelManagementHelper that there are 3 connections
and gets the object the names of those connections
- TomcatAJPConnector (class is ConnectorGBean)
- TomcatWebConnector (class is ConnectorGBean)
- TomcatWebSSLConnector (class is HttpsConnectorGBean)
- Attempt to create proxies for the 3 connections. This works for for
the first two listed about but fails building the proxy for the
TomcatWebSSLConnector GBean.
- Looking at the BasicProxyManager I can see it creating the Enhancer
and associating all of the interfaces. This GBean has 5 interfaces
which are reduced to 3 in the ManagedProxyFactory (the ones with the *
are the ones that remain after reduction)
- o.a.g.management.geronimo.NetworkConnector
* o.a.g.management.geronimo.SecureConnector
* o.a.g.tomcat.TomcatWebConnector
- o.a.g.management.WebConnector
* o.a.g.kernel.proxy.GeronimoManagedBean
- These remaining 3 interfaces are used to set the Enhanced interfaces
(which seems strange to me because I would think that we would have
wanted all 5 interfaces in the proxy ... is this a problem?) and, since
No, this interface reduction is doing it's job to ensure that we have
the least number of interfaces while still representing all of the
object's capabilities.
there is more than 1 interface left, Object is set as the superClass.
- When we finally invoke the enhancer.createClass() we get a
NoClassDefFoundError exception for the TomcatWebConnector interface.
This is also strange because at lease one of the other connector GBeans
(TomcatWebConnector) also implements this interface and it was
successful creating that proxy.
Any ideas?
stack trace:
08:52:55,740 ERROR [KernelManagementHelper] Unable to look up related
GBeannet.sf.cglib.core.CodeGenerationException:
java.lang.reflect.InvocationTargetException-->null
at
net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:237)
at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:377)
at net.sf.cglib.proxy.Enhancer.createClass(Enhancer.java:317)
at
org.apache.geronimo.kernel.basic.BasicProxyManager$ManagedProxyFactory.<init>(BasicProxyManager.java:222)
at
org.apache.geronimo.kernel.basic.BasicProxyManager.createProxyFactory(BasicProxyManager.java:92)
at
org.apache.geronimo.kernel.basic.BasicProxyManager.createProxy(BasicProxyManager.java:119)
at
org.apache.geronimo.kernel.basic.BasicProxyManager.createProxies(BasicProxyManager.java:156)
at
org.apache.geronimo.console.util.KernelManagementHelper.getWebConnectors(KernelManagementHelper.java:339)
at
org.apache.geronimo.console.util.PortletManager.getWebConnectors(PortletManager.java:150)
at
org.apache.geronimo.console.webmanager.ConnectorPortlet.doList(ConnectorPortlet.java:375)
at
org.apache.geronimo.console.webmanager.ConnectorPortlet.doView(ConnectorPortlet.java:360)
at javax.portlet.GenericPortlet.doDispatch(GenericPortlet.java:247)
at javax.portlet.GenericPortlet.render(GenericPortlet.java:175)
at
org.apache.pluto.core.PortletServlet.dispatch(PortletServlet.java:218)
at
org.apache.pluto.core.PortletServlet.doGet(PortletServlet.java:158)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:595)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
at
org.apache.pluto.core.PortletServlet.service(PortletServlet.java:153)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at
org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
at
org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at
org.apache.pluto.invoker.impl.PortletInvokerImpl.invoke(PortletInvokerImpl.java:120)
at
org.apache.pluto.invoker.impl.PortletInvokerImpl.render(PortletInvokerImpl.java:73)
at
org.apache.pluto.PortletContainerImpl.renderPortlet(PortletContainerImpl.java:119)
at
org.apache.pluto.portalImpl.core.PortletContainerWrapperImpl.renderPortlet(PortletContainerWrapperImpl.java:70)
at
org.apache.pluto.portalImpl.aggregation.PortletFragment.service(PortletFragment.java:168)
at
org.apache.jsp.WEB_002dINF.aggregation.ColumnFragment_jsp._jspService(org.apache.jsp.WEB_002dINF.aggregation.ColumnFragment_jsp:65)
at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
at
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at
org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
at
org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at
org.apache.pluto.portalImpl.aggregation.AbstractFragment.service(AbstractFragment.java:112)
at
org.apache.jsp.WEB_002dINF.aggregation.RowFragment_jsp._jspService(org.apache.jsp.WEB_002dINF.aggregation.RowFragment_jsp:64)
at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
at
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at
org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
at
org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at
org.apache.pluto.portalImpl.aggregation.AbstractFragment.service(AbstractFragment.java:112)
at
org.apache.jsp.WEB_002dINF.aggregation.PageFragment_jsp._jspService(org.apache.jsp.WEB_002dINF.aggregation.PageFragment_jsp:67)
at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
at
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at
org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
at
org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at
org.apache.pluto.portalImpl.aggregation.AbstractFragment.service(AbstractFragment.java:112)
at
org.apache.jsp.WEB_002dINF.aggregation.PageFragment_jsp._jspService(org.apache.jsp.WEB_002dINF.aggregation.PageFragment_jsp:67)
at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
at
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at
org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
at
org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at
org.apache.pluto.portalImpl.aggregation.AbstractFragment.service(AbstractFragment.java:112)
at
org.apache.jsp.WEB_002dINF.aggregation.RootFragment_jsp._jspService(org.apache.jsp.WEB_002dINF.aggregation.RootFragment_jsp:170)
at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
at
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at
org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
at
org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
at
org.apache.pluto.portalImpl.aggregation.AbstractFragment.service(AbstractFragment.java:112)
at org.apache.pluto.portalImpl.Servlet.doGet(Servlet.java:254)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:595)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482)
at
org.apache.geronimo.tomcat.valve.DefaultSubjectValve.invoke(DefaultSubjectValve.java:46)
at
org.apache.geronimo.tomcat.valve.PolicyContextValve.invoke(PolicyContextValve.java:50)
at
org.apache.geronimo.tomcat.valve.TransactionContextValve.invoke(TransactionContextValve.java:53)
at
org.apache.geronimo.tomcat.valve.ComponentContextValve.invoke(ComponentContextValve.java:47)
at
org.apache.geronimo.tomcat.valve.InstanceContextValve.invoke(InstanceContextValve.java:60)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:526)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:534)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at
net.sf.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:384)
at
net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:219)
... 116 more
Caused by: java.lang.NoClassDefFoundError:
org/apache/geronimo/tomcat/TomcatWebConnector
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:539)
--
Joe Bohn
[EMAIL PROTECTED]
"He is no fool who gives what he cannot keep, to gain what he cannot
lose." -- Jim Elliot
