Java.lang.InstantiationException on user defined class

Hi all,
I'm getting the following exception.
Portable(java.io.IOException): An exception occurred instantiating a PortableObject user type from a POF stream: type-id=2001, class-name=com.inmdb.CacheRowDataExtractor, exception=
java.lang.InstantiationException: com.inmdb.CacheRowDataExtractor
at com.tangosol.io.pof.PortableObjectSerializer.deserialize(PortableObjectSerializer.java:121)
at com.tangosol.io.pof.PofBufferReader.readAsObject(PofBufferReader.java:3293)
at com.tangosol.io.pof.PofBufferReader.readObject(PofBufferReader.java:2600)
at com.tangosol.util.filter.ExtractorFilter.readExternal(ExtractorFilter.java:165)
at com.tangosol.util.filter.ComparisonFilter.readExternal(ComparisonFilter.java:227)
at com.tangosol.util.filter.LikeFilter.readExternal(LikeFilter.java:367)
at com.tangosol.io.pof.PortableObjectSerializer.initialize(PortableObjectSerializer.java:153)
at com.tangosol.io.pof.PortableObjectSerializer.deserialize(PortableObjectSerializer.java:128)
at com.tangosol.io.pof.PofBufferReader.readAsObject(PofBufferReader.java:3293)
at com.tangosol.io.pof.PofBufferReader.readAsObjectArray(PofBufferReader.java:3337)
at com.tangosol.io.pof.PofBufferReader.readObjectArray(PofBufferReader.java:2169)
at com.tangosol.util.filter.ArrayFilter.readExternal(ArrayFilter.java:235)
at com.tangosol.io.pof.PortableObjectSerializer.initialize(PortableObjectSerializer.java:153)
at com.tangosol.io.pof.PortableObjectSerializer.deserialize(PortableObjectSerializer.java:128)
at com.tangosol.io.pof.PofBufferReader.readAsObject(PofBufferReader.java:3293)
at com.tangosol.io.pof.PofBufferReader.readObject(PofBufferReader.java:2600)
at com.tangosol.io.pof.ConfigurablePofContext.deserialize(ConfigurablePofContext.java:348)
at com.tangosol.coherence.component.util.daemon.queueProcessor.Service.readObject(Service.CDB:4)
at com.tangosol.coherence.component.net.Message.readObject(Message.CDB:1)
at com.tangosol.coherence.component.net.message.requestMessage.distributedCacheRequest.partialRequest.FilterRequest.read(FilterRequest.CDB:8)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$QueryRequest.read(DistributedCache.CDB:1)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.onNotify(Grid.CDB:123)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache.onNotify(DistributedCache.CDB:3)
at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:42)
at java.lang.Thread.run(Thread.java:595)
at <process boundary>
at com.tangosol.io.pof.ThrowablePofSerializer.deserialize(ThrowablePofSerializer.java:57)
at com.tangosol.io.pof.PofBufferReader.readAsObject(PofBufferReader.java:3293)
at com.tangosol.io.pof.PofBufferReader.readObject(PofBufferReader.java:2600)
at com.tangosol.io.pof.PortableException.readExternal(PortableException.java:150)
at com.tangosol.io.pof.ThrowablePofSerializer.deserialize(ThrowablePofSerializer.java:58)
at com.tangosol.io.pof.PofBufferReader.readAsObject(PofBufferReader.java:3293)
at com.tangosol.io.pof.PofBufferReader.readObject(PofBufferReader.java:2600)
at com.tangosol.io.pof.ConfigurablePofContext.deserialize(ConfigurablePofContext.java:348)
at com.tangosol.coherence.component.util.daemon.queueProcessor.Service.readObject(Service.CDB:4)
at com.tangosol.coherence.component.net.Message.readObject(Message.CDB:1)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$QueryResponse.read(DistributedCache.CDB:33)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.onNotify(Grid.CDB:123)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache.onNotify(DistributedCache.CDB:3)
at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:42)
at java.lang.Thread.run(Thread.java:595)
class looks like:-
public class CacheRowDataExtractor extends AbstractExtractor implements
PortableObject, Serializable {
// code
What could be the problem?
Thanks in advance,
Rony

Hi Rony,
Yes it is mandatory. The default POF serializer just calls newInstance() on the Class to create an instance and it has no way of knowing how to call parameterised constructors. If you must have parameterised constructors then you would need to use external serializers rather than implement PortableObject. The docs are here: http://docs.oracle.com/cd/E24290_01/coh.371/e22837/api_pof.htm#BABEJCFF
Does your Dev environment only have a single Coherence process, if so then nothing will be getting serialised so you will not see this sort of error. This is a common dev mistake and if possible you should always write Dev tests to use multiple nodes and also write unit tests to test POF serialisation.
Writing a unit test is pretty easy...
ConfigurablePofContext ctx = new ConfigurablePofContext("... name of your pof config file ...");
CacheRowDataExtractor value = new CacheRowDataExtractor......
Binary binary = ExternalizableHelper.toBinary(value, ctx);
CacheRowDataExtractor result = (CacheRowDataExtractor) ExternalizableHelper.fromBinary(binary, ctx);
... now assert result is equal to original value ...JK

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     at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918)
     at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:96)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918)
     at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:96)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918)
     at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:144)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918)
     at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:96)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918)
     at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:96)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918)
     at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:144)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918)
     at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:96)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918)
     at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:96)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918)
     at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:144)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918)
     at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:144)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918)
     at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:96)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918)
     at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:96)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918)
     at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:96)
     at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918)
     at javax.faces.component.UIComponentBase.processRestoreState(UIComponentBase.java:1182)
     at org.apache.myfaces.trinidadinternal.application.StateManagerImpl.restoreView(StateManagerImpl.java:651)
     at com.sun.faces.application.ViewHandlerImpl.restoreView(ViewHandlerImpl.java:316)
     at javax.faces.application.ViewHandlerWrapper.restoreView(ViewHandlerWrapper.java:204)
     at org.apache.myfaces.trinidadinternal.application.ViewHandlerImpl.restoreView(ViewHandlerImpl.java:282)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._restoreView(LifecycleImpl.java:532)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:281)
     at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:177)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
     at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
     at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
     at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
     at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:27)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
     at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:191)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
     at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:97)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:421)
     at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:421)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:247)
     at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:157)
     at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
     at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:94)
     at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
     at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:414)
     at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:138)
     at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
     at sni.foundation.facesextensions.filters.FoundationFilter.doFilter(FoundationFilter.java:93)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
     at oracle.security.wls.filter.SSOSessionSynchronizationFilter.doFilter(SSOSessionSynchronizationFilter.java:280)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
     at oracle.adf.library.webapp.LibraryFilter.doFilter(LibraryFilter.java:160)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
     at oracle.dms.wls.DMSServletFilter.doFilter(DMSServletFilter.java:330)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
     at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
     at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.doIt(WebAppServletContext.java:3684)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3650)
     at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
     at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2268)
     at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2174)
     at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1446)
     at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
     at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
Can someone throw some light based on this error, I know its hard to know but any clue is highly appreciated.
Thanks a lot !

Hi experts,
I am Working in jdev 11.1.1.3.0.
We are facing same issue in most of non-development environment.
Wed Mar 21 09:16:28:651 CDT 2012 | 1332339388651 | 23 | IRCT_UI | null | 1ZgGPphftVRpq3wRhKTD6VcDTpg7DsJvcYLYBglspVC1TvvZvPpf!1815485401!-1542606130!1332337375138 | 143dc8c6-d216-4fff-89cd-b8ceb095df97[0000JOpbR3c1Newj8DNa4D1FQNwC0000ae,0] | d57461 | SEVERE | org.apache.myfaces.trinidad.bean.util.StateUtils$Saver.restoreState |java.lang.InstantiationException: oracle.adfinternal.view.faces.model.binding.FacesCtrlSearchBinding$QueryIntegerConverter
at java.lang.Class.newInstance0(Class.java:340)
at java.lang.Class.newInstance(Class.java:308)
at org.apache.myfaces.trinidad.bean.util.StateUtils$Saver.restoreState(StateUtils.java:533)
at org.apache.myfaces.trinidad.bean.util.StateUtils.restoreStateHolder(StateUtils.java:411)
at org.apache.myfaces.trinidad.bean.PropertyKey.restoreValue(PropertyKey.java:243)
at org.apache.myfaces.trinidad.bean.util.StateUtils.restoreState(StateUtils.java:357)
at org.apache.myfaces.trinidad.bean.util.FlaggedPropertyMap.restoreState(FlaggedPropertyMap.java:195)
at org.apache.myfaces.trinidad.bean.FacesBeanImpl.restoreState(FacesBeanImpl.java:348)
at org.apache.myfaces.trinidad.component.UIXComponentBase.restoreState(UIXComponentBase.java:945)
at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:58)
at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918)
at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:96)
at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918)
at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:96)
at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918)
at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:96)
at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918)
at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:96)
at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918) at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:96) at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918) at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:96) at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918) at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:144) at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918) at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:96) at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918) at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:96) at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918) at org.apache.myfaces.trinidad.component.TreeState.restoreState(TreeState.java:144) at org.apache.myfaces.trinidad.component.UIXComponentBase.processRestoreState(UIXComponentBase.java:918)
          at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:97) at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:421) at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60) at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:421)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:247)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:157)
at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:94)
at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:414)
at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:138)
at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
at sni.foundation.facesextensions.filters.FoundationFilter.doFilter(FoundationFilter.java:93)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
at oracle.security.wls.filter.SSOSessionSynchronizationFilter.doFilter(SSOSessionSynchronizationFilter.java:280)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
at oracle.adf.library.webapp.LibraryFilter.doFilter(LibraryFilter.java:160)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
at oracle.dms.wls.DMSServletFilter.doFilter(DMSServletFilter.java:330)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.doIt(WebAppServletContext.java:3684)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3650)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2268)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2174)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1446)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
Any inputs could be highly appreciate.

Cannot comile user defined classes

Hello i have a problem on compiling user defined classes .
example
file x.java
public class x{
file y.java
import x;
public class y{
I first compile x.java and everything is OK .
Then i compile y.java and the compiler gives the folowing
y.java:2: '.' expected
import y
I have tried to put the classes on a package and added the folowing line yo each file
import /home/bill/test
Then i puted the java files on that dir
and compiled with
javac -classpath /home/bill/test y.java
AGAIN THE SAME
y.java:2: '.' expected
import y
WHAT I DO WRONG PLEASE HELP!!!!!!!!!!!!

1. Since J2SDK 1.4, you can not import classes that are in the default (or unnamed) package. You are getting the error because the compiler expects something after y like y.*;
2. You do not need to import classes that are in the same package, and all classes in the default package are in the same package.
In your case, your classes are in the default package so remove the import statement.

Exception: java.lang.InstantiationException.....

Hi there,
I have recently been playing around with converting an application to an applet. Everything seems great at my end, I have tried ir in 'Internet Explorer 6' & 'Netscape 6.2', they both show the applet, however 'Opera 5' does not. The annoying problem is that nobody else can see the applet in thier browser's. Because I can't experience what they are seeing it is proving really dificult to troubleshoot this error. The only indication I have to the route of this problem is the message:
Exception: java.lang.InstantiationException.....
I have even remove this class file from my own P.C. just to make sure that some how I am not viewing the local class on my computer instead of what I have uploaded. It had no effect on my results as I suspected. Could it be I need to use a H.T.M.L. convertor?
I am a bit stumped. Does anyone know what trhis error message generally means.
If you want the code I can e-mail, but in the mean time if anyone is familiar with this problem, HELP!!!

the previous post pretty much explained what the Exception means exactly. To be more specific however, your compiler would not let you instantiate an interface or abstract class so either a) you are doing this incorrectly via reflection or b) there is some class conflict with client system. Is your applet enclosed in an applet tag that directs the browser to use the sun plugin? I would recomend that you have clients use the sun plugin- it will probably solve this problem (assumming it is not bad code) and you should run into less conflicts between different browser types.

How to put a user defined class in Web dynpro

How and where can we create some user defined classes?
For example i wanted to create some utility classs for my project. Under what folder should i create this?

Please create the .java files under src folder of the project
Go to PackageExplorer->expand the project->select src/packages and create the package under this and create java file.
Regards, Anilkumar

Java.lang.InstantiationException

My class throws a java.lang.InstantiationException and I can't see why. my class extends an abstract class but should not be abstract itself.
My Class_
package com.propylon.core.tests;
import org.eclipse.core.runtime.Plugin;
import org.osgi.framework.BundleContext;
* The activator class controls the plug-in life cycle
public class Activator extends Plugin {
     // The plug-in ID
     public static final String PLUGIN_ID = "com.propylon.core.tests";
     // The shared instance
     private static Activator plugin;
     * The constructor
     public Activator() {
     * (non-Javadoc)
     * @see org.eclipse.core.runtime.Plugins#start(org.osgi.framework.BundleContext)
     public void start(BundleContext context) throws Exception {
          super.start(context);
          plugin = this;
     * (non-Javadoc)
     * @see org.eclipse.core.runtime.Plugin#stop(org.osgi.framework.BundleContext)
     public void stop(BundleContext context) throws Exception {
          plugin = null;
          super.stop(context);
     * Returns the shared instance
     * @return the shared instance
     public static Activator getDefault() {
          return plugin;
Console Window_
java-test:
[echo] Running com.propylon.core.tests.testcase.AllTests. Result file: C:/eclipse3.3/results/com.propylon.core.tests.testcase.AllTests.xml.
[java] org.osgi.framework.BundleException: The activator org.eclipse.core.runtime.Plugin for bundle com.propylon.core.Test is invalid
[java]      at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:141)
[java]      at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:970)
[java]      at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:346)
[java]      at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:260)
[java]      at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:400)
[java]      at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:111)
[java]      at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:417)
[java]      at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:189)
[java]      at org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java:340)
[java]      at org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal(BundleLoader.java:408)
[java]      at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:369)
[java]      at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:357)
[java]      at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:83)
[java]      at java.lang.ClassLoader.loadClass(Unknown Source)
[java]      at org.eclipse.osgi.framework.internal.core.BundleLoader.loadClass(BundleLoader.java:289)
[java]      at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:227)
[java]      at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1269)
[java]      at org.eclipse.test.EclipseTestRunner.loadSuiteClass(EclipseTestRunner.java:302)
[java]      at org.eclipse.test.EclipseTestRunner.getTest(EclipseTestRunner.java:233)
[java]      at org.eclipse.test.EclipseTestRunner.<init>(EclipseTestRunner.java:216)
[java]      at org.eclipse.test.EclipseTestRunner.run(EclipseTestRunner.java:200)
[java]      at org.eclipse.test.CoreTestApplication.runTests(CoreTestApplication.java:35)
[java]      at org.eclipse.test.CoreTestApplication.run(CoreTestApplication.java:31)
[java]      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[java]      at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
[java]      at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[java]      at java.lang.reflect.Method.invoke(Unknown Source)
[java]      at org.eclipse.equinox.internal.app.EclipseAppContainer.callMethod(EclipseAppContainer.java:533)
[java]      at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:155)
[java]      at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)
[java]      at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)
[java]      at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363)
[java]      at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176)
[java]      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[java]      at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
[java]      at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[java]      at java.lang.reflect.Method.invoke(Unknown Source)
[java]      at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:504)
[java]      at org.eclipse.equinox.launcher.Main.basicRun(Main.java:443)
[java]      at org.eclipse.equinox.launcher.Main.run(Main.java:1169)
[java]      at org.eclipse.equinox.launcher.Main.main(Main.java:1144)
[java]      at org.eclipse.core.launcher.Main.main(Main.java:30)
[java] Caused by: java.lang.InstantiationException
[java]      at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(Unknown Source)
[java]      at java.lang.reflect.Constructor.newInstance(Unknown Source)
[java]      at java.lang.Class.newInstance0(Unknown Source)
[java]      at java.lang.Class.newInstance(Unknown Source)
[java]      at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:136)
[java]      ... 41 more
[java] Java Result: 2
Is there anything obviously flawed with this class or am I going mad.
thank you for your time
slider

I can't see anywhere in your code that tries to create an Activator object... i.e. there is nowhere that tries to use the new Activator() constructor, so I would suggest that the problem is not with your code.
This is the description of Instantiation Exception from the API:
Thrown when an application tries to create an instance of a class using the newInstance method in class Class, but the specified class object cannot be instantiated because it is an interface or is an abstract class.
So, I would imagine, somewhere the Class.newInstance() method is being invoked on Plugin (the abstract class) rather than Activator (the non-abstract one)

Unreported Exception java.lang.InstantiationException

Dear Friends,
I am developing javabean connectivty for inserting records to mysql database from jsp. when i try to compile java bean program. It gives an error like unreported Exception java.lang.InstantiationException: Must be caught or declared to be thrown*. This is my mode. Please anyone help to solve this error. if you find any error in my code, please suggest me. Thanks in advance.
package com.webdeveloper.servlets;
import java.sql.*;
import java.io.*;
public class InsertBean {
private String dbURL = "jdbc:mysql://localhost:3306/test";
private Connection dbCon;
private Statement st;
String dbuser = "root";
String dbpass = "admin";
String Name = null;
String Address = null;
String Zip = null;
public InsertBean() {
super();
public String getName() {
return this.Name;
public String getAddress() {
return this.Address;
public String getZip() {
return this.Zip;
public void setName(String pname) {
this.Name = pname;
public void setAddress(String paddress) {
this.Address = paddress;
public void setZip(String pzip) {
this.Zip = pzip;
public void doInsert() throws ClassNotFoundException, SQLException {
Class.forName("com.mysql.jdbc.Driver").newInstance();//it gives error in this line
dbCon = DriverManager.getConnection(dbURL,dbuser,dbpass);
Statement s = dbCon.createStatement();
String sql = "Insert into Person values ('" + this.Name;
sql = sql + "', '" + this.Address + "', " + this.Zip;
sql = sql + ")";
int insertResult = s.executeUpdate(sql);
dbCon.close();
}

Dear BalusC,
Thanks for your suggestion. I used try catch block also. But it still gives same error. I have modified my following code. Is there any thing wrong in my code? Please give me your suggestion. Thankyou.
// Java Document
package com.webdeveloper.servlets;
import java.sql.*;
import java.io.*;
public class InsertBean {
private String dbURL = "jdbc:mysql://localhost:3306/test";
private Connection dbCon;
private Statement st;
String dbuser = "root";
String dbpass = "admin";
String Name = null;
String Address = null;
String Zip = null;
public InsertBean() {
super();
public String getName() {
return this.Name;
public String getAddress() {
return this.Address;
public String getZip() {
return this.Zip;
public void setName(String pname) {
this.Name = pname;
public void setAddress(String paddress) {
this.Address = paddress;
public void setZip(String pzip) {
this.Zip = pzip;
public void doInsert() throws ClassNotFoundException, SQLException {
     try{
     Class.forName("com.mysql.jdbc.Driver").newInstance();
dbCon = DriverManager.getConnection(dbURL,dbuser,dbpass);
Statement s = dbCon.createStatement();
String sql = "Insert into Person values ('" + this.Name;
sql = sql + "', '" + this.Address + "', " + this.Zip;
sql = sql + ")";
int insertResult = s.executeUpdate(sql);
     catch(Exception e){
     System.out.println("error occured :" + e);
     dbCon.close();
}

User defined class for Web Services

I am trying to use the Web Service Publishing Wizard to publish
a class as a web service. The wizard will not allow me to select
the method I wish to publish. When I click on the "Why Not?"
button the message says:
"One or more parameters did not have an XML Schema mapping
and/or serializer specified"
I use user defined classes as parameters of the methods of the service web.
How cam i install this web service on "Oracle J2EE Web services"?

If you use Java Beans (or single dimension arrays of Java Beans) that implement the java.io.serializable interface as per this article:
http://otn.oracle.com/tech/webservices/htdocs/samples/customtype/content.html
then Oracle9iAS will handle the publishing process of custom data types. The publishing wizard in Oracle9i JDeveloper 9.0.2 doesn't support this yet, but the link in the article to the JDeveloper help gives a fairly straightforward workaround. This workaround will be eliminated in Oracle9i JDeveloper 9.0.3 (due late August).
Does representing your parameters as Java Beans work for your problem?
Mike.

Class Data Sharing for User Defined Classes

i am using jdk 5.0 . JDK 5.0 supports class data sharing for system level classes. Is there any way a class data sharing be done for a user defined class?

Samantha10 wrote:
Is this class data sharing possible for user defined classes also? i have a singleton class which i am invoking through a script. The script has been scheduled to run every 1 sec . Since it is being invoked every 1 sec hence the singleton pattern is failing . Hence if the this class data sharing is possible then the singleton pattern can be made applicable.If you have a single process and you have a single class loaded by two different ClassLoader instances
in some respects they will be two different classes
if (class1 instanceof class2.getClass())returns false.
This is not the case for Java core classes because they are always loaded by the SystemClassLoader.
You write you
have a singleton class which i am invoking through a script. What approach to you use to invoke the singleton?
I am trying to figure out if you launch a new JVM every second...
Maybe you can use Nailgun.

Identifying APIs & user-defined classes

I have a class name in a string variable. Is it possible to identify whether that class is a Java API or user-defined class ? Please note that the identification has to be done thru code not manually.

There is no clear distinction between Java API and user defined classes. What I mean is there is no rule to limit user to use java.util as their package name and create their own classes like java.util.CustomCollection. Although that is not recommended at all, but nothing prevents it. There is sun.* package which implements most of the java.* classes, do you consider those Java API? And there are third party classes such as org.omg.* etc. All these classes including user defined classes are treated equally with the JVM.
So there is no clear distinction. The only thing you can do is to define a list of class names you consider Java API.
Why do you want to seperate them if I may ask? Since the JVM doesn't care.
--lichu

Java.lang.InstantiationException on user defined class

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