StaticFile.read(...) throws exception in vcm7.6

I am using the following code to copy over a static file to a new location (VCM version 7.6)

                      StaticFile staticFile = (StaticFile)iterator.next();
                      byte[] buffer = new byte[8 * 1024];

                      CMSFileOpsInputStream input = (CMSFileOpsInputStream)staticFile.getFileContents();


                      OutputStream output = new FileOutputStream(file);

                      int bytesRead = input.read(buffer);
                      while (bytesRead != -1) {
                                output.write(buffer, 0, bytesRead);

                       }

at line

    bytesRead = input.read(buffer);

I get the following exception:

Exception in thread "main" java.lang.IncompatibleClassChangeError: Implementing class
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:480)
    at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:182)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:224)
    at java.lang.ClassLoader.loadClassInternal(Unknown Source)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:480)
    at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:182)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:224)
    at weblogic.rmi.internal.StubGenerator.getStubClass(StubGenerator.java:696)
    at weblogic.rmi.internal.StubGenerator.generateStub(StubGenerator.java:742)
    at weblogic.rmi.internal.StubGenerator.generateStub(StubGenerator.java:729)
    at weblogic.rmi.extensions.StubFactory.getStub(StubFactory.java:79)
    at weblogic.rmi.utils.io.RemoteObjectReplacer.resolveObject(RemoteObjectReplacer.java:236)
    at weblogic.rmi.internal.StubInfo.readResolve(StubInfo.java:149)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at java.io.ObjectStreamClass.invokeReadResolve(Unknown Source)
    at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
    at java.io.ObjectInputStream.readObject0(Unknown Source)
    at java.io.ObjectInputStream.readObject(Unknown Source)
    at weblogic.common.internal.ChunkedObjectInputStream.readObject(ChunkedObjectInputStream.java:120)
    at weblogic.rjvm.MsgAbbrevInputStream.readObject(MsgAbbrevInputStream.java:135)
    at weblogic.rmi.internal.ObjectIO.readObject(ObjectIO.java:56)
    at weblogic.rjvm.ResponseImpl.unmarshalReturn(ResponseImpl.java:164)
    at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:293)
    at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:248)
    at com.vignette.cms.server.ejb.CMSOps_waox3u_EOImpl_1001_WLStub.getFileOps(Unknown Source)
    at com.vignette.cms.client.ejb.CMSBase.getFileOps(CMSBase.java:5333)
    at com.vignette.cms.client.javabean.CMSBase.getFileOps(CMSBase.java:1615)
    at com.vignette.as.client.javabean.CMSFileOpsInputStream.openIfNecessary(CMSFileOpsInputStream.java:59)
    at com.vignette.as.client.javabean.CMSFileOpsInputStream.read(CMSFileOpsInputStream.java:202)
    at com.dweb.cms.ws.VignetteWS.convertStaticFileToRMF(VignetteWS.java:1409)
    at com.dweb.cms.test.MyTest.main(MyTest.java:3193)

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Comments

David_Stiles

I don’t know why you’re getting that exception. Perhaps it hassomething to do with how your application is put together (missing jar orsomething like that). But one thing about your code here is that you should notbe casting the return value from getFileContents() to CMSFileOpsInputStream.The method is defined to return InputStream and that’s all you should beconcerned with. It may not always return the same type of InputStream, so youcan’t assume you know anything about the specific InputStream implementationreturned. Furthermore, CMSFileOpsInputStream is an internal class, so it’sinappropriate to reference it in any way in your code.

From: eLink Entry:Discussion Group - Web Experience Management[mailto:v7webcontentmanagement@elinkkc.opentext.com]
Sent: Thursday, April 14, 2011 5:05 PM
To: eLink Recipient
Subject: StaticFile.read(...) throws exception in vcm7.6

StaticFile.read(...) throws exception in vcm7.6

Posted by rita.kataki@defenseweb.com (Kataki, Rita) On 2011/04/14 18:00

I am using the following code to copy over a static file to a new location (VCM version 7.6)

                      StaticFile staticFile = (StaticFile)iterator.next();
                      byte[] buffer = new byte[8 * 1024];

                      CMSFileOpsInputStream input = (CMSFileOpsInputStream)staticFile.getFileCont! ents();


                      OutputStream output = new FileOutputStream(file);

                      int bytesRead = input.read(buffer);
                      while (bytesRead != -1) {
           ! ;           &nb! sp;        output.write(buffer, 0, bytesRead);

                       }

at line

    bytesRead = input.read(buffer);

I get the following exception:

Exception in thread "main" java.lang.IncompatibleClassChangeError: Implementing class
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
!     at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:480)
    at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:182)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:224)
    at java.lang.ClassLoader.loadClassInternal(Unknown Source)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:480)
    at w! eblogic.utils.classloaders.GenericClassLoader.findClass(Gener! icClassLoader.java:182)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:224)
    at weblogic.rmi.internal.StubGenerator.getStubClass(StubGenerator.java:696)
    at weblogic.rmi.internal.StubGenerator.generateStub(StubGenerator.java:742)
    at weblogic.rmi.internal.StubGenerator.generateStub(StubGenerator.java:729)
    at weblogic.rmi.extensions.StubFactory.getStub(StubFactory.java:79)
    at weblogic.rmi.utils.io.RemoteObjectReplacer.resolveObject(RemoteObjectReplacer.java:236)
    at weblogic.rmi.internal.StubInfo.readResolve(StubInfo.java:149)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ! e Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at java.io.ObjectStreamClass.invokeReadResolve(Unknown Source)
    at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
    at java.io.ObjectInputStream.readObject0(Unknown Source)
    at java.io.ObjectInputStream.readObject(Unknown Source)
    at weblogic.common.internal.ChunkedObjectInputStream.readObject(ChunkedObjectInputStream.java:120)
    at weblogic.rjvm.MsgAbbrevInputStream.readObject(MsgAbbrevInputStream.java:135)
    at weblogic.rmi.internal.ObjectIO.readObject(ObjectIO.java:56)
    at weblogic.rjvm.Resp! onseImpl.unmarshalReturn(ResponseImpl.java:164)
!    at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:293)
    at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:248)
    at com.vignette.cms.server.ejb.CMSOps_waox3u_EOImpl_1001_WLStub.getFileOps(Unknown Source)
    at com.vignette.cms.client.ejb.CMSBase.getFileOps(CMSBase.java:5333)
    at com.vignette.cms.client.javabean.CMSBase.getFileOps(CMSBase.java:1615)
    at com.vignette.as.client.javabean.CMSFileOpsInputStream.openIfNecessary(CMSFileOpsInputStream.java:59)
    at com.vignette.as.client.javabean.CMSFileOpsInputStream.read(CMSFileOpsInputStream.java:202)
    at com.dweb.cms.ws.VignetteWS.convertStaticFileToRMF(VignetteWS.java:1409)
    at com.dweb.cms.test.MyTest.main(MyTest.java:3193)

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