Java.lang.LinkageError:loader constraints

Hi,
          I am having problem with on of my ejb having some
          classes sharing with my servlet. The following is the
          exception which I get. I guess this is due to different
          classloader trying to load the sharing class. I have
          my app dur struct. in exploded format under WEB-INF\classes
          My ejbs do not contain the common classes. WEB-INF\classes
          is in weblogic classpath.
          <Servlet failed with Exception
          java.lang.LinkageError: Class com/pmi/enterprise/securityauthority/Roles
          violates loader constraints
          at java.lang.ClassLoader.defineClass0(Native Method)
          at java.lang.ClassLoader.defineClass0(Compiled Code)
          at java.lang.ClassLoader.defineClass(Compiled Code)
          at java.lang.ClassLoader.defineClass(Compiled Code)
          at
          weblogic.utils.classloaders.GenericClassLoader.findLocalClass(Compiled Code)
          at
          weblogic.utils.classloaders.GenericClassLoader.reallyLoadClass(Compiled
          Code)
          at
          weblogic.utils.classloaders.RecursiveReloadOnModifyClassLoader$Slave.loadCla
          ss(Compiled Code)
          at weblogic.utils.classloaders.GenericClassLoader.loadClass(Compiled
          Code)
          at java.lang.ClassLoader.loadClassInternal(Compiled Code)
          at
          com.pmi.webedi.servlets.RequestServlet.doPost(RequestServlet.java:215)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:772)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
          at
          weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
          :105)
          at
          weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImp
          l.java:742)
          at
          weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImp
          l.java:686)
          at
          weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContext
          Manager.java:247)
          at
          weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java:361)
          at
          weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:261)
          at weblogic.kernel.ExecuteThread.run(Compiled Code)
          I donot have anything under WEB-INF\lib. If I include the EJB Jars then I
          get ClassCastException.
          Can anyone help me with this. This is working application on Win2000 and I
          am moving to sun
          and restructuring accor. to servlet spec2.2.
          Thanks in advance,
          - Rishi Prakash
          

I tried recompiling all the related classes and rebuilt my ejb. But it
          didn't help. I tried a couple of more things.
          I moved one of the common class from my classpath
          to the ejb jar. This in effect eliminated the from this class
          and showed the same error on another common class. Then I moved both the
          classes to the ejb jar. Now I got
          NoclassDef FoundError from the servlet. I also tried including at both
          places (ie in jar as well as Classpath). Again it did not help. I have no
          clue now what to do.
          Any more help or clue is appriciated.
          - Rishi Prakash
          "Mark Spotswood" <[email protected]> wrote in message
          news:[email protected]...
          > The error means that a class which
          com/pmi/enterprise/securityauthority/Roles
          > depends on has changed in a way that is incompatible with the current
          version
          > of Roles. This could happen if the JDK being used is different than the
          JDK
          > that Roles was originally compiled against, or if you have rebuilt some
          class
          > that Roles uses, but have not also rebuilt Roles.
          > --
          > mark
          >
          > Rishi Prakash wrote:
          >
          > > Hi,
          > >
          > > I am having problem with on of my ejb having some
          > > classes sharing with my servlet. The following is the
          > > exception which I get. I guess this is due to different
          > > classloader trying to load the sharing class. I have
          > > my app dur struct. in exploded format under WEB-INF\classes
          > > My ejbs do not contain the common classes. WEB-INF\classes
          > > is in weblogic classpath.
          > >
          > > <Servlet failed with Exception
          > > java.lang.LinkageError: Class com/pmi/enterprise/securityauthority/Roles
          > > violates loader constraints
          > > at java.lang.ClassLoader.defineClass0(Native Method)
          > > at java.lang.ClassLoader.defineClass0(Compiled Code)
          > > at java.lang.ClassLoader.defineClass(Compiled Code)
          > > at java.lang.ClassLoader.defineClass(Compiled Code)
          > > at
          > > weblogic.utils.classloaders.GenericClassLoader.findLocalClass(Compiled
          Code)
          > > at
          > > weblogic.utils.classloaders.GenericClassLoader.reallyLoadClass(Compiled
          > > Code)
          > > at
          > >
          weblogic.utils.classloaders.RecursiveReloadOnModifyClassLoader$Slave.loadCla
          > > ss(Compiled Code)
          > > at
          weblogic.utils.classloaders.GenericClassLoader.loadClass(Compiled
          > > Code)
          > > at java.lang.ClassLoader.loadClassInternal(Compiled Code)
          > > at
          > > com.pmi.webedi.servlets.RequestServlet.doPost(RequestServlet.java:215)
          > > at javax.servlet.http.HttpServlet.service(HttpServlet.java:772)
          > > at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
          > > at
          > >
          weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
          > > :105)
          > > at
          > >
          weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImp
          > > l.java:742)
          > > at
          > >
          weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImp
          > > l.java:686)
          > > at
          > >
          weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContext
          > > Manager.java:247)
          > > at
          > >
          weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java:361)
          > > at
          > > weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:261)
          > > at weblogic.kernel.ExecuteThread.run(Compiled Code)
          > >
          > > I donot have anything under WEB-INF\lib. If I include the EJB Jars then
          I
          > > get ClassCastException.
          > > Can anyone help me with this. This is working application on Win2000 and
          I
          > > am moving to sun
          > > and restructuring accor. to servlet spec2.2.
          > >
          > > Thanks in advance,
          > > - Rishi Prakash
          >
          

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              Hi
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              Tue May 01 13:56:41 CDT 2001:<I> <ServletContext-omxclient> Generated java file:
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              Tue May 01 13:56:43 CDT 2001:<E> <ServletContext-omxclient> Servlet failed with
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              pl.java:123)
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              textImpl.java:742)
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              textImpl.java:686)
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              >>java.lang.LinkageError: Class javax/servlet/ServletConfig
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              >"mreiche" <[email protected]> wrote:
              >>
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              >>Mike
              >>
              >>
              >>"KC" <[email protected]> wrote:
              >>>
              >>>Hi
              >>>I registered a web app with Weblogic 5.1 in the weblogic.properties
              >>file.
              >>>I try
              >>>to run the web app from my browser typing http://localhost:7001/xxx(Webapp
              >>>name)
              >>>and a jsp page. Following is the error I get. It would be helpful if
              >>>some one
              >>>could point me to a fix for this problem
              >>>
              >>>Tue May 01 13:56:41 CDT 2001:<I> <ServletContext-omxclient> Generated
              >>>java file:
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              >>failed
              >>>with
              >>>Exception
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              >>>aints
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              >>>pl.java:105)
              >>> at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
              >>>pl.java:123)
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              >>>textImpl.java:742)
              >>> at weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletCon
              >>>textImpl.java:686)
              >>> at weblogic.servlet.internal.ServletContextManager.invokeServlet(Servlet
              >>>ContextManager.java:247)
              >>> at weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.jav
              >>>a:361)
              >>> at weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:261)
              >>>
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  • Java.lang.LinkageError: duplicate class definition

    Dear Experts,
    We are in the process of Migrating current Mi2.5 application to NWM7.1.
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    Pls advice..

    Error: 500
    Location: /ZEFL_BP_MI/jsp/stock/bp_technicians_issue_sparesforms.jsp
    Internal Servlet Error:
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    at java.lang.ClassLoader.defineClass(Unknown Source)
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    at org.apache.tomcat.loader.AdaptiveClassLoader.doDefineClass(AdaptiveClassLoader.java:575)
    at org.apache.tomcat.loader.AdaptiveClassLoader.loadClass(AdaptiveClassLoader.java:542)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.beans.Beans.instantiate(Unknown Source)
    at java.beans.Beans.instantiate(Unknown Source)
    at jsp.stock.bp_0005ftechnicians_0005fissue_0005fsparesforms._jspService(bp_0005ftechnicians_0005fissue_0005fsparesforms.java:101)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
    at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
    at org.apache.tomcat.core.Handler.service(Handler.java:287)
    at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
    at org.apache.tomcat.facade.RequestDispatcherImpl.doForward(RequestDispatcherImpl.java:222)
    at org.apache.tomcat.facade.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:162)
    at com.sap.ip.me.api.runtime.jsp.AbstractMEHttpServlet.dispatchRequest(AbstractMEHttpServlet.java:780)
    at com.sap.ip.me.api.runtime.jsp.AbstractMEHttpServlet.doGetThreadSafe(AbstractMEHttpServlet.java:281)
    at com.sap.ip.me.api.runtime.jsp.AbstractMEHttpServlet.doGet(AbstractMEHttpServlet.java:552)
    at com.sap.ip.me.api.runtime.jsp.AbstractMEHttpServlet.service(AbstractMEHttpServlet.java:190)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
    at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
    at org.apache.tomcat.core.Handler.service(Handler.java:287)
    at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
    at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:806)
    at org.apache.tomcat.core.ContextManager.service(ContextManager.java:752)
    at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
    at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
    at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
    at java.lang.Thread.run(Unknown Source)
    Regards,
    Saptak

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