Startdrag() and ClassCastException !

hello everybody !
when i execute this code :
public class CTree extends JTree implements DragSourceListener,
                                                  DragGestureListener,
                                                  Autoscroll {
     private BufferedImage _imgGhost;
public void dragGestureRecognized(DragGestureEvent e) {
Transferable transferable = new ... ;
e.startDrag(null, _imgGhost, new Point(5,5), transferable, this);
a message "ClassCastException" appears and the problem is linked to the startDrag() method.
why ?
it's important or not ?
can you help me ?
thanks for all.
FMP.

this the stack :
"java.lang.ClassCastException
     at sun.awt.datatransfer.DataTransferer.translateTransferable(DataTransferer.java:1197)
     at apple.awt.CDataTransferer.translateTransferable(CDataTransferer.java:129)
     at sun.awt.datatransfer.DataTransferer$6.run(DataTransferer.java:1937)
     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:448)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:230)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:183)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)
FMP.

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[5/22/03 7:03:00:118 CDT] 2ec4c80 ConnectionFac I J2CA0122I: Resource reference jdbc/DB239DataSource could not be located, so default values of the following are used: [Resource-ref settings]
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[5/22/03 7:03:01:160 CDT] 2ec4c80 ConnectionFac E J2CA0009E: An exception occurred while trying to instantiate the ManagedConnectionFactory class com.ibm.ws.rsadapter.spi.WSManagedConnectionFactoryImpl used by resource jdbc/DB239DataSource : java.lang.ClassCastException: org.apache.xerces.jaxp.SAXParserFactoryImpl
     at javax.xml.parsers.SAXParserFactory.newInstance(Unknown Source)
     at com.ibm.ejs.j2c.XMLReader.validate(XMLReader.java:673)
     at com.ibm.ejs.j2c.XMLReader.init(XMLReader.java:241)
     at com.ibm.ejs.j2c.XMLReader.<init>(XMLReader.java:165)
     at com.ibm.ejs.j2c.ConnectorRuntime.getJ2C_Properties(ConnectorRuntime.java:341)
     at com.ibm.ejs.j2c.poolmanager.PoolManager.<init>(PoolManager.java:541)
     at com.ibm.ejs.j2c.ConnectionFactoryBuilderImpl.createCFD_Common(ConnectionFactoryBuilderImpl.java:699)
     at com.ibm.ejs.j2c.ConnectionFactoryBuilderImpl.createConnectionFactoryDetails(ConnectionFactoryBuilderImpl.java:417)
     at com.ibm.ejs.j2c.ConnectionFactoryBuilderImpl.getObjectInstance(ConnectionFactoryBuilderImpl.java:1400)
     at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:313)
     at com.ibm.ws.naming.util.Helpers.processSerializedObjectForLookup(Helpers.java:884)
     at com.ibm.ws.naming.jndicos.CNContextImpl.processResolveResults(CNContextImpl.java:1675)
     at com.ibm.ws.naming.jndicos.CNContextImpl.doLookup(CNContextImpl.java:1538)
     at com.ibm.ws.naming.jndicos.CNContextImpl.doLookup(CNContextImpl.java:1458)
     at com.ibm.ws.naming.jndicos.CNContextImpl.lookup(CNContextImpl.java:1130)
     at com.ibm.ws.naming.util.WsnInitCtx.lookup(WsnInitCtx.java:122)
     at javax.naming.InitialContext.lookup(InitialContext.java:363)
     at oracle.toplink.jndi.JNDIConnector.connect(Unknown Source)
     at oracle.toplink.sessions.DatabaseLogin.connect(Unknown Source)
     at oracle.toplink.internal.databaseaccess.DatabaseAccessor.connect(Unknown Source)
     at oracle.toplink.internal.databaseaccess.DatabaseAccessor.connect(Unknown Source)
     at oracle.toplink.threetier.ConnectionPool.buildConnection(Unknown Source)
     at oracle.toplink.threetier.ConnectionPool.startUp(Unknown Source)
     at oracle.toplink.threetier.ServerSession.connect(Unknown Source)
     at oracle.toplink.publicinterface.DatabaseSession.login(Unknown Source)
     at oracle.toplink.tools.sessionmanagement.SessionManager.getSession(Unknown Source)
     at oracle.toplink.tools.sessionmanagement.SessionManager.getSession(Unknown Source)
     at oracle.toplink.tools.sessionmanagement.SessionManager.getSession(Unknown Source)
     at com.deere.jdc.toplink.ToplinkServerSessionFactory.getSession(ToplinkServerSessionFactory.java:121)
     at com.deere.jdc.toplink.ToplinkServerSessionFactory.getClientSession(ToplinkServerSessionFactory.java:56)
     at com.deere.jdc.component.rcts.dao.RCTSGateway.findDealerASMByDealerNumber(RCTSGateway.java:194)
     at com.deere.jdc.component.rcts.service.RCTSService.getRCTSDealerASM(RCTSService.java:159)
     at com.deere.jdc.component.rcts.adapter.SoapRCTSService.getRCTSDealerASM(SoapRCTSService.java:107)
     at java.lang.reflect.Method.invoke(Native Method)
     at com.deere.jdc.component.rcts.messaging.RCTSMessageHandler.invokeServiceMethod(RCTSMessageHandler.java:103)
     at com.deere.jdc.component.rcts.messaging.RCTSMessageHandler.processMessage(RCTSMessageHandler.java:62)
     at com.deere.jdc.mqseries.MQJMSMessageHandler.onMessage(MQJMSMessageHandler.java:122)
     at com.ibm.mq.jms.MQQueueReceiver.receiveAsync(MQQueueReceiver.java:861)
     at com.ibm.mq.jms.SessionAsyncHelper.run(SessionAsyncHelper.java:401)
     at java.lang.Thread.run(Thread.java:513)
[5/22/03 7:03:01:310 CDT] 2ec4c80 ConnectionFac A J2CA0013I: An exception occurred while trying to create ManagedConnectionFactory for DB239DataSource : java.lang.ClassCastException: org.apache.xerces.jaxp.SAXParserFactoryImpl
     at javax.xml.parsers.SAXParserFactory.newInstance(Unknown Source)
     at com.ibm.ejs.j2c.XMLReader.validate(XMLReader.java:673)
     at com.ibm.ejs.j2c.XMLReader.init(XMLReader.java:241)
     at com.ibm.ejs.j2c.XMLReader.<init>(XMLReader.java:165)
     at com.ibm.ejs.j2c.ConnectorRuntime.getJ2C_Properties(ConnectorRuntime.java:341)
     at com.ibm.ejs.j2c.poolmanager.PoolManager.<init>(PoolManager.java:541)
     at com.ibm.ejs.j2c.ConnectionFactoryBuilderImpl.createCFD_Common(ConnectionFactoryBuilderImpl.java:699)
     at com.ibm.ejs.j2c.ConnectionFactoryBuilderImpl.createConnectionFactoryDetails(ConnectionFactoryBuilderImpl.java:417)
     at com.ibm.ejs.j2c.ConnectionFactoryBuilderImpl.getObjectInstance(ConnectionFactoryBuilderImpl.java:1400)
     at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:313)
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     at com.ibm.ws.naming.jndicos.CNContextImpl.processResolveResults(CNContextImpl.java:1675)
     at com.ibm.ws.naming.jndicos.CNContextImpl.doLookup(CNContextImpl.java:1538)
     at com.ibm.ws.naming.jndicos.CNContextImpl.doLookup(CNContextImpl.java:1458)
     at com.ibm.ws.naming.jndicos.CNContextImpl.lookup(CNContextImpl.java:1130)
     at com.ibm.ws.naming.util.WsnInitCtx.lookup(WsnInitCtx.java:122)
     at javax.naming.InitialContext.lookup(InitialContext.java:363)
     at oracle.toplink.jndi.JNDIConnector.connect(Unknown Source)
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     at oracle.toplink.internal.databaseaccess.DatabaseAccessor.connect(Unknown Source)
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     at oracle.toplink.threetier.ConnectionPool.buildConnection(Unknown Source)
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     at oracle.toplink.publicinterface.DatabaseSession.login(Unknown Source)
     at oracle.toplink.tools.sessionmanagement.SessionManager.getSession(Unknown Source)
     at oracle.toplink.tools.sessionmanagement.SessionManager.getSession(Unknown Source)
     at oracle.toplink.tools.sessionmanagement.SessionManager.getSession(Unknown Source)
     at com.deere.jdc.toplink.ToplinkServerSessionFactory.getSession(ToplinkServerSessionFactory.java:121)
     at com.deere.jdc.toplink.ToplinkServerSessionFactory.getClientSession(ToplinkServerSessionFactory.java:56)
     at com.deere.jdc.component.rcts.dao.RCTSGateway.findDealerASMByDealerNumber(RCTSGateway.java:194)
     at com.deere.jdc.component.rcts.service.RCTSService.getRCTSDealerASM(RCTSService.java:159)
     at com.deere.jdc.component.rcts.adapter.SoapRCTSService.getRCTSDealerASM(SoapRCTSService.java:107)
     at java.lang.reflect.Method.invoke(Native Method)
     at com.deere.jdc.component.rcts.messaging.RCTSMessageHandler.invokeServiceMethod(RCTSMessageHandler.java:103)
     at com.deere.jdc.component.rcts.messaging.RCTSMessageHandler.processMessage(RCTSMessageHandler.java:62)
     at com.deere.jdc.mqseries.MQJMSMessageHandler.onMessage(MQJMSMessageHandler.java:122)
     at com.ibm.mq.jms.MQQueueReceiver.receiveAsync(MQQueueReceiver.java:861)
     at com.ibm.mq.jms.SessionAsyncHelper.run(SessionAsyncHelper.java:401)
     at java.lang.Thread.run(Thread.java:513)
[5/22/03 7:03:01:340 CDT] 2ec4c80 Helpers W NMSV0605W: A Reference object looked up from the context "localhost/nodes/localhost/servers/server1" with the name "jdbc/DB239DataSource" was sent to the JNDI Naming Manager and an exception resulted. Reference data follows:
Reference Factory Class Name: com.ibm.ejs.j2c.ConnectionFactoryBuilderImpl
Reference Factory Class Location URLs: <null>
Reference Class Name: DB239DataSource
Type: connectorName
Content: DB239DataSource
Type: classpath
Content: C:\Program Files\IBM\WebSphere Studio\runtimes\base_v5/lib/rsadapter.rar
Type: FactoryJndiName
Content: jdbc/DB239DataSource
Address Type: dd
AddressContents: ffffffac ffffffed 0 5 73 72 0 25 63 6f 6d 2e 69 62 6d 2e 65 6a 73 2e 6a 32 63 2e 52 65 73 6f 75 72 63 65 ...
Address Type: poolProps
AddressContents: ffffffac ffffffed 0 5 73 72 0 27 63 6f 6d 2e 69 62 6d 2e 65 6a 73 2e 6a 32 63 2e 43 6f 6e 6e 65 63 74 6f ...
Address Type: configProps
AddressContents: ffffffac ffffffed 0 5 73 72 0 23 63 6f 6d 2e 69 62 6d 2e 65 6a 73 2e 6a 32 63 2e 43 6f 6e 6e 65 63 74 6f ...
Address Type: dsProps
AddressContents: ffffffac ffffffed 0 5 73 72 0 14 6a 61 76 61 2e 75 74 69 6c 2e 50 72 6f 70 65 72 74 69 65 73 39 12 ffffffd0 7a ...
Address Type: mcfProps
AddressContents: ffffffac ffffffed 0 5 73 72 0 2d 63 6f 6d 2e 69 62 6d 2e 65 6a 73 2e 6a 32 63 2e 4d 61 6e 61 67 65 64 43 ...
Address Type: mbeanProps
AddressContents: ffffffac ffffffed 0 5 73 72 0 1a 63 6f 6d 2e 69 62 6d 2e 65 6a 73 2e 6a 32 63 2e 4d 42 65 61 6e 50 72 6f ...
Exception data follows:
java.lang.ClassCastException: org.apache.xerces.jaxp.SAXParserFactoryImpl
     at javax.xml.parsers.SAXParserFactory.newInstance(Unknown Source)
     at com.ibm.ejs.j2c.XMLReader.validate(XMLReader.java:673)
     at com.ibm.ejs.j2c.XMLReader.init(XMLReader.java:241)
     at com.ibm.ejs.j2c.XMLReader.<init>(XMLReader.java:165)
     at com.ibm.ejs.j2c.ConnectorRuntime.getJ2C_Properties(ConnectorRuntime.java:341)
     at com.ibm.ejs.j2c.poolmanager.PoolManager.<init>(PoolManager.java:541)
     at com.ibm.ejs.j2c.ConnectionFactoryBuilderImpl.createCFD_Common(ConnectionFactoryBuilderImpl.java:699)
     at com.ibm.ejs.j2c.ConnectionFactoryBuilderImpl.createConnectionFactoryDetails(ConnectionFactoryBuilderImpl.java:417)
     at com.ibm.ejs.j2c.ConnectionFactoryBuilderImpl.getObjectInstance(ConnectionFactoryBuilderImpl.java:1400)
     at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:313)
     at com.ibm.ws.naming.util.Helpers.processSerializedObjectForLookup(Helpers.java:884)
     at com.ibm.ws.naming.jndicos.CNContextImpl.processResolveResults(CNContextImpl.java:1675)
     at com.ibm.ws.naming.jndicos.CNContextImpl.doLookup(CNContextImpl.java:1538)
     at com.ibm.ws.naming.jndicos.CNContextImpl.doLookup(CNContextImpl.java:1458)
     at com.ibm.ws.naming.jndicos.CNContextImpl.lookup(CNContextImpl.java:1130)
     at com.ibm.ws.naming.util.WsnInitCtx.lookup(WsnInitCtx.java:122)
     at javax.naming.InitialContext.lookup(InitialContext.java:363)
     at oracle.toplink.jndi.JNDIConnector.connect(Unknown Source)
     at oracle.toplink.sessions.DatabaseLogin.connect(Unknown Source)
     at oracle.toplink.internal.databaseaccess.DatabaseAccessor.connect(Unknown Source)
     at oracle.toplink.internal.databaseaccess.DatabaseAccessor.connect(Unknown Source)
     at oracle.toplink.threetier.ConnectionPool.buildConnection(Unknown Source)
     at oracle.toplink.threetier.ConnectionPool.startUp(Unknown Source)
     at oracle.toplink.threetier.ServerSession.connect(Unknown Source)
     at oracle.toplink.publicinterface.DatabaseSession.login(Unknown Source)
     at oracle.toplink.tools.sessionmanagement.SessionManager.getSession(Unknown Source)
     at oracle.toplink.tools.sessionmanagement.SessionManager.getSession(Unknown Source)
     at oracle.toplink.tools.sessionmanagement.SessionManager.getSession(Unknown Source)
     at com.deere.jdc.toplink.ToplinkServerSessionFactory.getSession(ToplinkServerSessionFactory.java:121)
     at com.deere.jdc.toplink.ToplinkServerSessionFactory.getClientSession(ToplinkServerSessionFactory.java:56)
     at com.deere.jdc.component.rcts.dao.RCTSGateway.findDealerASMByDealerNumber(RCTSGateway.java:194)
     at com.deere.jdc.component.rcts.service.RCTSService.getRCTSDealerASM(RCTSService.java:159)
     at com.deere.jdc.component.rcts.adapter.SoapRCTSService.getRCTSDealerASM(SoapRCTSService.java:107)
     at java.lang.reflect.Method.invoke(Native Method)
     at com.deere.jdc.component.rcts.messaging.RCTSMessageHandler.invokeServiceMethod(RCTSMessageHandler.java:103)
     at com.deere.jdc.component.rcts.messaging.RCTSMessageHandler.processMessage(RCTSMessageHandler.java:62)
     at com.deere.jdc.mqseries.MQJMSMessageHandler.onMessage(MQJMSMessageHandler.java:122)
     at com.ibm.mq.jms.MQQueueReceiver.receiveAsync(MQQueueReceiver.java:861)
     at com.ibm.mq.jms.SessionAsyncHelper.run(SessionAsyncHelper.java:401)
     at java.lang.Thread.run(Thread.java:513)
[5/22/03 7:03:01:891 CDT] 2ec4c80 Helpers W NMSV0610I: A NamingException is being thrown from a javax.naming.Context implementation. Details follow:
Context implementation: com.ibm.ws.naming.jndicos.CNContextImpl
Context method: lookup
Context name: localhost/nodes/localhost/servers/server1
Target name: jdbc/DB239DataSource
Other data:
Exception stack trace: com.ibm.websphere.naming.CannotInstantiateObjectException: Exception occurred while the JNDI NamingManager was processing a javax.naming.Reference object. Root exception is java.lang.ClassCastException: org.apache.xerces.jaxp.SAXParserFactoryImpl
     at javax.xml.parsers.SAXParserFactory.newInstance(Unknown Source)
     at com.ibm.ejs.j2c.XMLReader.validate(XMLReader.java:673)
     at com.ibm.ejs.j2c.XMLReader.init(XMLReader.java:241)
     at com.ibm.ejs.j2c.XMLReader.<init>(XMLReader.java:165)
     at com.ibm.ejs.j2c.ConnectorRuntime.getJ2C_Properties(ConnectorRuntime.java:341)
     at com.ibm.ejs.j2c.poolmanager.PoolManager.<init>(PoolManager.java:541)
     at com.ibm.ejs.j2c.ConnectionFactoryBuilderImpl.createCFD_Common(ConnectionFactoryBuilderImpl.java:699)
     at com.ibm.ejs.j2c.ConnectionFactoryBuilderImpl.createConnectionFactoryDetails(ConnectionFactoryBuilderImpl.java:417)
     at com.ibm.ejs.j2c.ConnectionFactoryBuilderImpl.getObjectInstance(ConnectionFactoryBuilderImpl.java:1400)
     at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:313)
     at com.ibm.ws.naming.util.Helpers.processSerializedObjectForLookup(Helpers.java:884)
     at com.ibm.ws.naming.jndicos.CNContextImpl.processResolveResults(CNContextImpl.java:1675)
     at com.ibm.ws.naming.jndicos.CNContextImpl.doLookup(CNContextImpl.java:1538)
     at com.ibm.ws.naming.jndicos.CNContextImpl.doLookup(CNContextImpl.java:1458)
     at com.ibm.ws.naming.jndicos.CNContextImpl.lookup(CNContextImpl.java:1130)
     at com.ibm.ws.naming.util.WsnInitCtx.lookup(WsnInitCtx.java:122)
     at javax.naming.InitialContext.lookup(InitialContext.java:363)
     at oracle.toplink.jndi.JNDIConnector.connect(Unknown Source)
     at oracle.toplink.sessions.DatabaseLogin.connect(Unknown Source)
     at oracle.toplink.internal.databaseaccess.DatabaseAccessor.connect(Unknown Source)
     at oracle.toplink.internal.databaseaccess.DatabaseAccessor.connect(Unknown Source)
     at oracle.toplink.threetier.ConnectionPool.buildConnection(Unknown Source)
     at oracle.toplink.threetier.ConnectionPool.startUp(Unknown Source)
     at oracle.toplink.threetier.ServerSession.connect(Unknown Source)
     at oracle.toplink.publicinterface.DatabaseSession.login(Unknown Source)
     at oracle.toplink.tools.sessionmanagement.SessionManager.getSession(Unknown Source)
     at oracle.toplink.tools.sessionmanagement.SessionManager.getSession(Unknown Source)
     at oracle.toplink.tools.sessionmanagement.SessionManager.getSession(Unknown Source)
     at com.deere.jdc.toplink.ToplinkServerSessionFactory.getSession(ToplinkServerSessionFactory.java:121)
     at com.deere.jdc.toplink.ToplinkServerSessionFactory.getClientSession(ToplinkServerSessionFactory.java:56)
     at com.deere.jdc.component.rcts.dao.RCTSGateway.findDealerASMByDealerNumber(RCTSGateway.java:194)
     at com.deere.jdc.component.rcts.service.RCTSService.getRCTSDealerASM(RCTSService.java:159)
     at com.deere.jdc.component.rcts.adapter.SoapRCTSService.getRCTSDealerASM(SoapRCTSService.java:107)
     at java.lang.reflect.Method.invoke(Native Method)
     at com.deere.jdc.component.rcts.messaging.RCTSMessageHandler.invokeServiceMethod(RCTSMessageHandler.java:103)
     at com.deere.jdc.component.rcts.messaging.RCTSMessageHandler.processMessage(RCTSMessageHandler.java:62)
     at com.deere.jdc.mqseries.MQJMSMessageHandler.onMessage(MQJMSMessageHandler.java:122)
     at com.ibm.mq.jms.MQQueueReceiver.receiveAsync(MQQueueReceiver.java:861)
     at com.ibm.mq.jms.SessionAsyncHelper.run(SessionAsyncHelper.java:401)
     at java.lang.Thread.run(Thread.java:513)
2003.05.22 07:03:02.111--ServerSession(426724481)--Thread[asyncDelivery0,5,main]--EXCEPTION [TOPLINK-7060] (TopLink - 9.0.3 (Build 423)): oracle.toplink.exceptions.ValidationException
EXCEPTION DESCRIPTION: Cannot acquire data source [jdbc/DB239DataSource].
INTERNAL EXCEPTION: com.ibm.websphere.naming.CannotInstantiateObjectException: Exception occurred while the JNDI NamingManager was processing a javax.naming.Reference object. [Root exception is java.lang.ClassCastException: org.apache.xerces.jaxp.SAXParserFactoryImpl]LOCAL EXCEPTION STACK:
EXCEPTION [TOPLINK-7060] (TopLink - 9.0.3 (Build 423)): oracle.toplink.exceptions.ValidationException
EXCEPTION DESCRIPTION: Cannot acquire data source [jdbc/DB239DataSource].
INTERNAL EXCEPTION: com.ibm.websphere.naming.CannotInstantiateObjectException: Exception occurred while the JNDI NamingManager was processing a javax.naming.Reference object. [Root exception is java.lang.ClassCastException: org.apache.xerces.jaxp.SAXParserFactoryImpl]
     at oracle.toplink.exceptions.ValidationException.cannotAcquireDataSource(Unknown Source)
     at oracle.toplink.jndi.JNDIConnector.connect(Unknown Source)
     at oracle.toplink.sessions.DatabaseLogin.connect(Unknown Source)
     at oracle.toplink.internal.databaseaccess.DatabaseAccessor.connect(Unknown Source)
     at oracle.toplink.internal.databaseaccess.DatabaseAccessor.connect(Unknown Source)
     at oracle.toplink.threetier.ConnectionPool.buildConnection(Unknown Source)
     at oracle.toplink.threetier.ConnectionPool.startUp(Unknown Source)
     at oracle.toplink.threetier.ServerSession.connect(Unknown Source)
     at oracle.toplink.publicinterface.DatabaseSession.login(Unknown Source)
     at oracle.toplink.tools.sessionmanagement.SessionManager.getSession(Unknown Source)
     at oracle.toplink.tools.sessionmanagement.SessionManager.getSession(Unknown Source)
     at oracle.toplink.tools.sessionmanagement.SessionManager.getSession(Unknown Source)
     at com.deere.jdc.toplink.ToplinkServerSessionFactory.getSession(ToplinkServerSessionFactory.java:121)
     at com.deere.jdc.toplink.ToplinkServerSessionFactory.getClientSession(ToplinkServerSessionFactory.java:56)
     at com.deere.jdc.component.rcts.dao.RCTSGateway.findDealerASMByDealerNumber(RCTSGateway.java:194)
     at com.deere.jdc.component.rcts.service.RCTSService.getRCTSDealerASM(RCTSService.java:159)
     at com.deere.jdc.component.rcts.adapter.SoapRCTSService.getRCTSDealerASM(SoapRCTSService.java:107)
     at java.lang.reflect.Method.invoke(Native Method)
     at com.deere.jdc.component.rcts.messaging.RCTSMessageHandler.invokeServiceMethod(RCTSMessageHandler.java:103)
     at com.deere.jdc.component.rcts.messaging.RCTSMessageHandler.processMessage(RCTSMessageHandler.java:62)
     at com.deere.jdc.mqseries.MQJMSMessageHandler.onMessage(MQJMSMessageHandler.java:122)
     at com.ibm.mq.jms.MQQueueReceiver.receiveAsync(MQQueueReceiver.java:861)
     at com.ibm.mq.jms.SessionAsyncHelper.run(SessionAsyncHelper.java:401)
     at java.lang.Thread.run(Thread.java:513)
INTERNAL EXCEPTION STACK:
com.ibm.websphere.naming.CannotInstantiateObjectException: Exception occurred while the JNDI NamingManager was processing a javax.naming.Reference object. Root exception is java.lang.ClassCastException: org.apache.xerces.jaxp.SAXParserFactoryImpl
     at javax.xml.parsers.SAXParserFactory.newInstance(Unknown Source)
     at com.ibm.ejs.j2c.XMLReader.validate(XMLReader.java:673)
     at com.ibm.ejs.j2c.XMLReader.init(XMLReader.java:241)
     at com.ibm.ejs.j2c.XMLReader.<init>(XMLReader.java:165)
     at com.ibm.ejs.j2c.ConnectorRuntime.getJ2C_Properties(ConnectorRuntime.java:341)
     at com.ibm.ejs.j2c.poolmanager.PoolManager.<init>(PoolManager.java:541)
     at com.ibm.ejs.j2c.ConnectionFactoryBuilderImpl.createCFD_Common(ConnectionFactoryBuilderImpl.java:699)
     at com.ibm.ejs.j2c.ConnectionFactoryBuilderImpl.createConnectionFactoryDetails(ConnectionFactoryBuilderImpl.java:417)
     at com.ibm.ejs.j2c.ConnectionFactoryBuilderImpl.getObjectInstance(ConnectionFactoryBuilderImpl.java:1400)
     at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:313)
     at com.ibm.ws.naming.util.Helpers.processSerializedObjectForLookup(Helpers.java:884)
     at com.ibm.ws.naming.jndicos.CNContextImpl.processResolveResults(CNContextImpl.java:1675)
     at com.ibm.ws.naming.jndicos.CNContextImpl.doLookup(CNContextImpl.java:1538)
     at com.ibm.ws.naming.jndicos.CNContextImpl.doLookup(CNContextImpl.java:1458)
     at com.ibm.ws.naming.jndicos.CNContextImpl.lookup(CNContextImpl.java:1130)
     at com.ibm.ws.naming.util.WsnInitCtx.lookup(WsnInitCtx.java:122)
     at javax.naming.InitialContext.lookup(InitialContext.java:363)
     at oracle.toplink.jndi.JNDIConnector.connect(Unknown Source)
     at oracle.toplink.sessions.DatabaseLogin.connect(Unknown Source)
     at oracle.toplink.internal.databaseaccess.DatabaseAccessor.connect(Unknown Source)
     at oracle.toplink.internal.databaseaccess.DatabaseAccessor.connect(Unknown Source)
     at oracle.toplink.threetier.ConnectionPool.buildConnection(Unknown Source)
     at oracle.toplink.threetier.ConnectionPool.startUp(Unknown Source)
     at oracle.toplink.threetier.ServerSession.connect(Unknown Source)
     at oracle.toplink.publicinterface.DatabaseSession.login(Unknown Source)
     at oracle.toplink.tools.sessionmanagement.SessionManager.getSession(Unknown Source)
     at oracle.toplink.tools.sessionmanagement.SessionManager.getSession(Unknown Source)
     at oracle.toplink.tools.sessionmanagement.SessionManager.getSession(Unknown Source)
     at com.deere.jdc.toplink.ToplinkServerSessionFactory.getSession(ToplinkServerSessionFactory.java:121)
     at com.deere.jdc.toplink.ToplinkServerSessionFactory.getClientSession(ToplinkServerSessionFactory.java:56)
     at com.deere.jdc.component.rcts.dao.RCTSGateway.findDealerASMByDealerNumber(RCTSGateway.java:194)
     at com.deere.jdc.component.rcts.service.RCTSService.getRCTSDealerASM(RCTSService.java:159)
     at com.deere.jdc.component.rcts.adapter.SoapRCTSService.getRCTSDealerASM(SoapRCTSService.java:107)
     at java.lang.reflect.Method.invoke(Native Method)
     at com.deere.jdc.component.rcts.messaging.RCTSMessageHandler.invokeServiceMethod(RCTSMessageHandler.java:103)
     at com.deere.jdc.component.rcts.messaging.RCTSMessageHandler.processMessage(RCTSMessageHandler.java:62)
     at com.deere.jdc.mqseries.MQJMSMessageHandler.onMessage(MQJMSMessageHandler.java:122)
     at com.ibm.mq.jms.MQQueueReceiver.receiveAsync(MQQueueReceiver.java:861)
     at com.ibm.mq.jms.SessionAsyncHelper.run(SessionAsyncHelper.java:401)
     at java.lang.Thread.run(Thread.java:513)

This looks like a classPath issue.check ur runtime
class path and make sure xerces is before any other
parser(xml4j /oracleParser)
vasanth

NamingException and ClassCastException during jndi lookup

Hi,
I am trying to access the SAP database(MaxDb)using JNDI lookup in WebDynpro simple java project.
But, during lookup I am getting the following error
com.sap.engine.services.jndi.persistent.exceptions.NamingException: Exception during lookup operation of object with name : jdbc/VSLOOKUP , can not resolve object reference [Root exception is java.lang.ClassCastException]
     at com.sap.engine.services.jndi.implclient.ClientContext.lookup(ClientContext.java:469)
     at com.sap.engine.services.jndi.implclient.ClientContext.lookup(ClientContext.java:558)
     at javax.naming.InitialContext.lookup(InitialContext.java:347)
     at com.vitalspring.healthbenefits.dbaccess.DBAccessHelper.main(DBAccessHelper.java:51)
Caused by: java.lang.ClassCastException
     at com.sap.engine.services.connector.ResourceObjectFactory.getObjectInstance(ResourceObjectFactory.java:149)
     at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:301)
     at com.sap.engine.services.jndi.implclient.ClientContext.lookup(ClientContext.java:466)
     ... 3 more
Can anybody throw some light on it?
Because, it's urgent for my project.
I would appreciate any kind of help in this regard.
Thanks & Regards,
Rambabu Kancharla

Hello Anilkumar,
Sorry for delay in reply as I was on out of work and didn't get chance to check the SDN forums.
I was able to do it in latest version sneak preview 11.
I think the problem with the version.
Thanks,
Rambabu

Servlets and Workspaces (AND ClassCastExceptions)

          I have a similiar situation but am not getting a ClassCastException but rather a
          NullPointerException when I try
          to use a contained object in my stored object.
          I do this in the server:
          WorkspaceServicesDef workspaceServices = services.workspace();
          WorkspaceDef defaultWS = workspaceServices.getWorkspace();
          WorkspaceDef dataWS = defaultWS.getWorkspace("DATA_WORKSPACE",
          WorkspaceDef.CREATE,
          WorkspaceDef.SCOPE_SERVER);
          dataWS.store(cMSKey, ms);
          and this in the JSP page:
          // Get the default T3Client Workspace
          WorkspaceDef defaultWS = t3.services.workspace().getWorkspace();
          // Attach to the system subWorkspace already created
          WorkspaceDef myDataWS = defaultWS.getWorkspace("DATA_WORKSPACE",
          WorkspaceDef.ATTACH,
          WorkspaceDef.SCOPE_SERVER);
          MimicServer ms = (MimicServer) myDataWS.fetch("MimicServer");
          Questions:
          1)Must I make the Object I want to store in the WorkSpace Serializable?? The
          Documentation says it can just be
          a Java Object??
          2) In my JSP page I get a good Object reference, but its contents are null
          (Probably because I didn't implement write() and read()).
          Thanks,
          matt obrien
          [email protected]
          Mark Griffith wrote:
          > Alexandre:
          >
          > Although byte for byte the FooObject is the same, according to the VM they
          > are different class. This is because a class's type distinctiveness is
          > based not only its interfaces,methods,data members etc but ALSO on its
          > classloader. There is a different classloader for the
          > serversclasses_FooObject and the servletclasses_FooObject so they are
          > considered different, so you get a CCE.
          >
          > Problem is that the servletclasses directory is designed to solve the
          > problem of reloading servlet classes and objects they used when modified
          > without having to restart the server. But this introduces the problem
          > discussed above. The only solution currently is to put the FooObject only in
          > one place or another. Unfortunately if you want a class in servletclasses
          > to interact classes loaded by the system/server classloader you cannot put
          > the class in the servletclasses without getting a CCE on reload of the
          > servlet in servletclasses. In this case you must put the class only in the
          > serverclasses directory. And this means of course you can only reload the
          > FooObject in the serverclasses directory if you bounce the server. (the
          > default java classloading behavior).
          >
          > This will be handled more elegantly in our next major release Spring 2000,
          > however note (and prepare by designing accordingly) the solution is to allow
          > the Servlet to interact with interfaces not actual classes and these
          > interfaces can be stuffed into system/server loaded classes such as
          > workspaces and httpsessions, thus preventing CCE's.
          >
          > Cheers
          > Mark G
          >
          > Alexandre Aubry wrote:
          >
          > > I have a named workspace which is created at startup of the server
          > > within a starup class.
          > > When the startup method is called, I instantiate and put an object
          > > called FooObject in the workspace.
          > >
          > > Then, in a servlet, called Dispatcher, in the service method, I
          > > retrieved my named workspace and the object
          > > FooObject which is in this workspace. At this time, I have a
          > > ClassCastException.
          > >
          > > To give you more details about my configuration, here is my directory
          > > configuration:
          > > weblogic
          > > |----------- serverclasses
          > > |------------- startupObject
          > > |------------- FooObject
          > > |----------- servletclasses
          > > |------------- myServlet
          > > |------------- FooObject (which is exactly
          > > the same of the serverclasses one)
          > >
          > > Do you have any ideas ? The idea is to instantiate a given object at the
          > > startup of the web server and to retrieve
          > > these objects within servlets and JSPs.
          > >
          > > Regards.
          > >
          > > --
          > > Alexandre Aubry
          > > Consultant
          > > Fi System, The Web Agency
          > > http://www.fisystem.fr
          > > mailto:[email protected]
          > > Phone: +33 1 55 04 03 03 Fax: +33 1 55 04 03 04
          >
          > --
          > =====================================================
          > Reply to the newsgroup. Don't reply to this mail
          > alias. This is used only for answering posts on
          > WebLogic Newsgroups.
          > =====================================================

Serialization and ClassCastException

hi all,
I have a a class like this:
import java.io.Serializable;
import java.util.ArrayList;
public class Fact implements Serializable {
     private String name;
     private ArrayList al=new ArrayList();
     public Fact(String _name) {
          name=_name;
          al.add("Pippo");
          al.add("Pluto");
          al.add("Papero");
     public String getName() {
          return name;
     public ArrayList getList() {
          return al;
and I want to serialize objects of it in a mySQL database table. the table has two field: 'name', a varchar(20) used as a key and 'object', a blob field to store Java objects.
this is my code to put object in the table (it seems to work fine):
public boolean putFact(Fact fact) { // inserts a new fact in the db
          Fact result=null;
          try {
               PreparedStatement pstmt=conn.prepareStatement("INSERT INTO facts VALUES (?, ?)");
               pstmt.setString(1, fact.getName());
               pstmt.setObject(2, fact);
               pstmt.executeUpdate();
               pstmt.close();
          } catch (SQLException ex) {
               System.out.println(ex.toString());
               return false;
          return true;
this code musts get an object from the table:
     public Fact getFact(String factName) {
          Fact result=null;
          try {
               Statement stmt=conn.createStatement();
               ResultSet rs=stmt.executeQuery("SELECT object FROM facts WHERE name='"+factName+"'");
               while (rs.next()) {
                    result=(Fact)rs.getObject(1);
               rs.close();
          stmt.close();
          } catch (SQLException ex) {
               System.out.println(ex.toString());
               return null;
     return result;
on the 7th line of the getFact method I have a ClassCastException: why?
in addition, if I remove the ArrayList element from the Fact class, my code works fine.
any help?
thanks a lot. :)

first of all, thanks for your support, sylviae. :)
well, I used your syntax
(System.err.println(anObject.getClass());) and the
result is "class Fact": so, the serialization process
seems to be right.
then, I tried to change the field from BLOB to
MEDIUMBLOB type, and now it works! so, I suppose that
the BLOB type was not able to manage a Fact object.That doesn't really make much sense. If in the revised code you were getting the exception on the line that casts anObject to be a Fact object, then I'd start to wonder about ClassLoader issues. Still, given that you've got it working, you're probably not concerrned about the exact cause.
>
in the end, can you suggest me a way to generate SQL
statements, if mine has the error you said?Use the prepareStatement mechanism as you did for the insert statement, and associate the value with the "?" parameter. I know this looks more clumsy, and is certainly more code, but it is much safer. It's also capable of a more effecient execution because the underlying implementation can note that it's already parsed the statement and avoid having to do it again.
Sylvia.

XMLDocument and ClassCastException

We recently upgraded to Java 1.4.1_02 from Java 1.3.0.
The following type casting worked in java 1.3.0, but throws java.lang.ClassCastException while running in Java 1.4.1.
XmlDocument xdoc = (XmlDocument)doc;
where 'doc' is a variable of interface org.w3c.dom.Document
Do anybody have an idea why it does not work in Java 1.4.1?
Does the parser.jar file (that has the classfiles XMLDocument and Document) need to be upgraded for Java 1.4.1?

The problem was because Java 1.4.1 comes with its apache's implementation of XMLDocument and this was interfering with the XMLDocument class in parser.jar, which was sun's implementation.
So, when we removed parser.jar from classpath, it is working fine.

JMS and ClassCastException

I'm trying to exchange messages between two applications running on Oracle 9iAS (9.0.3) and I'm getting a ClassCastException.
Basically, I'm sending Command instances over the wire, which are to be executed on the other end. The concrete Command class is in a jar, which is in both web applications' WEB-INF/lib. I checked that both apps contain the same version of the jar. I have a simple JSP in both apps to publish a message containing a command. For testing purposes, both apps run in the same JVM (OC4J).
Both apps have a TopicSubscriber instance connected to the same Topic. When I publish an instance of ObjectMessage with the Command instance as the payload, both apps receive the message, but upon getting the payload (message.getObject()) the app that did not send the message fails with a ClassCastException.
Here's an example:
App A publishes an ObjectMessage with an instance of com.foo.FooCommand on the Topic
App A receives the message and successfully gets the FooCommand from the received message
App B receives the message and fails with a ClassCastException when getting the FooCommand from the message.
The ClassCastException looks like this:
java.lang.ClassCastException: com.foo.FooCommand
Publisher:
Message m = topicSession.createObjectMessage(new FooCommand());
Subscriber:
ObjectMessage om = (ObjectMessage) message;
Command c = (Command) om.getObject();
The second line in the subscriber code fails. Command is the interface that has to be implemented by all commands, it extends Serializable.
I already tried adding a serialVersionUID to the command class, but it didn't help. Is there any other way into making the ClassLoader believe that both instances are the same?
Any ideas?
TIA,
Nils

Nils, the ClassCastException is expected if you put your class in both applications' WEB-INF/lib. The class is loaded by App A's web module classloader and, separately, loaded by App B's web module classloader. You have two instances of Class that have the same underlying bits of class format but loaded by two different classloaders, which is the classic situation that leads to ClassCastException.
The guideline of the solution: let a common parent classloader of those two classloaders load the class. What you need to do is to make your jar visible to all applications or loaded by a parent application of your App A and App B. The way to do it is mentioned in my message
Re: Quick question on parent-child relationship in OC4J 10.1.3
The simplest of all is to put your jar in
<ORACLE_HOME>/j2ee/home/applib.
Hope this help you.

ServerAffinity and Stateless EJB and ClassCastException

Hello,
          We are using Weblogic Server 8.1 SP4.
          I have an EJB set the bean-load-algorithm to weight-based-affinity because we have a client cluster communicating with a server cluster and would like to maintain affinity with a single node of the server cluster.
          We are getting the following exception when making a call from the client to the server:
          Caused by: java.lang.ClassCastException
          at weblogic.rmi.cluster.WeightBasedReplicaHandler.chooseReplica(WeightBa
          sedReplicaHandler.java:53)
          at weblogic.rmi.cluster.BasicReplicaHandler.chooseReplicaUsingAffinity(B
          asicReplicaHandler.java:567)
          at weblogic.rmi.cluster.BasicReplicaHandler.loadBalance(BasicReplicaHand
          ler.java:283)
          at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteR
          ef.java:241)
          at org.collegeboard.ecommerce.content.ejb.AdService_5ucrg0_EOImpl_814_WL
          Stub.retrieveAd(Unknown Source)
          ... 25 more
          When I switch the server EJB back to the default of round robin, it works fine.
          The default cluster algo for both clusters are the default (at the server level).
          Any ideas?
          Thanks in advance.
          --bahar

I think you should contact [email protected] This looks like a bug to me.
          -- Rob
          WLS Blog http://dev2dev.bea.com/blog/rwoollen/

TreeSet and ClassCastException

Hi,
I know that I shouldn't add abjects to TreeSet which can't be compared (it's called
mutually comparable, isn't it ?) - so basically thay all have to be the same type.
But could anybody explain me why if I break this tule I get this error:
Exception in thread "main" java.lang.ClassCastException: java.lang.Integer
     at java.lang.String.compareTo(String.java:90)
     at java.util.TreeMap.compare(TreeMap.java:1093)
     at java.util.TreeMap.put(TreeMap.java:465)
     at java.util.TreeSet.add(TreeSet.java:210)
     at com.adrian.Book.main(Book.java:26)
What interests me here is what a TreeMap is doing here ?
And how am I supposed to read this information (step by step) ?
I don't understand this output ...
Here is the code:
public class Book {
     public static void main(String[] args) {
          Set s=new TreeSet();
          s.add(new Integer(1));
          s.add("a");
          s.add(new Integer(5));
          s.add(new Integer(3));
          for(Object o:s)
               System.out.print(o+" ");
}Thanks,
Adrian

Ok - I found that TreeSet uses TreeMap in its
implementation - that's why it appears
there.That is correct.
TreeSet makes a call to TreeMap's put(...) method on line 210 from the add(...) method.
Exception in thread "main" java.lang.ClassCastException: java.lang.Integer
at java.lang.String.compareTo(String.java:90)
at java.util.TreeMap.compare(TreeMap.java:1093)
at java.util.TreeMap.put(TreeMap.java:465)
at java.util.TreeSet.add(TreeSet.java:210)
at com.adrian.Book.main(Book.java:26)
If you're curious what is happening exactly, you can always (download and) take a look at the source code:
http://download.java.net/jdk6/

Generics and ClassCastException

Does anyone know why in the following code map.get("one").getClass() is the only line which throws ClassCastException.
        Map<Integer, Integer> map = new HashMap<Integer, Integer>();
        map.put(1, 1);
        System.out.println("map.get(1) =" + map.get(1));
        Object obj = map;
        Map<String, Number> map2 = (Map<String, Number>) obj;
        map2.put("one", 1L);
        System.out.println("map2.get(1) =" + map2.get(1));
        System.out.println("map2.get(one) =" + map2.get("one"));
        Map<String, Integer> map3 = (Map<String, Integer>) obj;
        System.out.println("map3.get(1) =" + map3.get(1));
        // Doesn't throw ClassCastException even though the return value is a Long, not Integer.
        Object objOne = map3.get("one");
        System.out.println("map3.get(one) =" + map3.get("one") + ", " + objOne.getClass());
        try {
            // throws ClassCastException ????.
            System.out.println("map3.get(one).getClass() =" + map3.get("one").getClass());
        } catch (ClassCastException e) {
            System.out.println("map3.get(one).getClass() throws " + e);
   }I have JDK 1.5.0_02

Map<String, Integer> map3 = (Map<String,<String, Integer>) obj;
System.out.println("map3.get(1) =" +
(1) =" + map3.get(1));
// Doesn't throw ClassCastException even
ion even though the return value is a Long, not
Integer.
Object objOne = map3.get("one");
System.out.println("map3.get(one) =" +
ne) =" + map3.get("one") + ", " +
objOne.getClass());
try {
// throws ClassCastException ????.
System.out.println("map3.get(one).getClass()
etClass() =" + map3.get("one").getClass());
} catch (ClassCastException e) {
System.out.println("map3.get(one).getClass()
etClass() throws " + e);
I have JDK 1.5.0_02
Okay, now that I have my X-Ray Specs on, I see the longs. At first, I was surprised
by the class cast, but what I think is happening is that the expression:
map3.get("one")Has an implicit cast in it, thanks to generics:
((Integer)map3.get("one"))And it's that cast that's generating the runtime exception. Now, how do folks
dump out class files in readable format? I'd like to see to myself...

References and ClassCastException

Hello,
Iu2019m getting the exception: java.lang.ClassCastException
If I have this:
List<Turno> turnos = (List<Turno>)this.servicioCrud.findAll(Turno.class);
         String resp ="**--**"+turnos+"-----"+turnos.size();
         return resp;
It works and I have the next message:
class $Proxy18271 **--**[co.com.crystal.eficiencias.entidad.Turno @ c58068, co.com.crystal.eficiencias.entidad.Turno @ 713fba, co.com.crystal.eficiencias.entidad.Turno @ 10f0602, co.com.crystal.eficiencias.entidad.Turno @ 1537b2e]-----4
but if I try to print every item of the list, like this:
List<Turno> turnos = (List<Turno>)this.servicioCrud.findAll(Turno.class);
      String resp ="**--**"+turnos+"-----"+turnos.size();
      for (int i = 0; i < turnos.size(); i++) {
                  resp = resp+" "+turnos.get(i).getDeTurno()+"\n";
      return resp;
I get the exception:
Caused by: java.lang.ClassCastException: class co.com.crystal.eficiencias.entidad.Turno:crystal.com.co/servicio_crud_ear @[email protected]@alive incompatible with class co.com.crystal.eficiencias.entidad.Turno:crystal.com.co/captura_produccion_ear @com.sap.engine.boot.loader.ResourceMultiParentClassLoader@1c589f@alive
at co.com.crystal.eficiencia.primera.CapturaPrimeraEjbBean.test(CapturaPrimeraEjbBean.java:409)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.sap.engine.services.ejb3.runtime.impl.RequestInvocationContext.proceedFinal(RequestInvocationContext.java:43)
I think the problem could be because de class Turno (which is in entidades.jar) are referenced in the two .ear files (servicio_crud.ear and captura_produccion_ear) through the tab u201CDependenciesu201D in the u201CComponent propertiesu201D.
I donu2019t know how I could reference the file entidades.jar without this problem.
Regards
Janeth

Hi Janeth,
It seems that entidades.jar (containing the class Turno) is being assembled in both of your apps (servicio_crud.ear and captura_produccion.ear) and that leads to the error.
You could try to only assemble it in servicio_crud.ear, and define a compile dependency on it in the respective module of captura_produccion.ear as well as a runtime dependency from captura_produccion.ear to servicio_crud.ear.
Or you could create a separate EAR DC to wrap entidades.jar and refer to it from both servicio_crud.ear and captura_produccion.ear (without assembling it into them).
HTH!
\-- Vladimir

WARs and ClassCastException redux...

so i've been poring through messages in this newsgroup.. and i've
          noticed that many people have run into the ClassCastException problem
          with WARs that have servlets forwarding on to jsps using objects
          stuffed away in sessions..
          i've been trying to get my web application working as a WAR, but i've
          run into this very problem. (jsps try to retrieve object from session
          that was stored away by controlling servlet, but get a
          ClassCastException) is it true that, because weblogic uses different
          classloaders for servlets and jsps in a WAR, WARs are essentially
          worthless for my app? is there a solution to this? is bea addressing
          this too?
          thx
          leo


i read your solution on previous posts, and it works.. but is this the
          only solution? it seems odd that the classloading behavior would
          differ depending on whether you executed a JSP or servlet first. do
          you mean that i have to invoke JSPs controlled by all my servlets
          first? or just one of them, and the rest will behave accordingly?
          thx
          leo
          On Thu, 21 Dec 2000, Cameron Purdy wrote:
          > After starting the server, invoke a JSP before invoking the first servlet.
          >
          > Peace,
          >
          > --
          > Cameron Purdy
          > Tangosol, Inc.
          > http://www.tangosol.com
          > +1.617.623.5782
          > WebLogic Consulting Available
          >
          >
          > "Leo Kim" <[email protected]> wrote in message
          > news:Pine.OSX.4.30.0012191647220.1267-100000@ginormous...
          > > so i've been poring through messages in this newsgroup.. and i've
          > > noticed that many people have run into the ClassCastException problem
          > > with WARs that have servlets forwarding on to jsps using objects
          > > stuffed away in sessions..
          > >
          > > i've been trying to get my web application working as a WAR, but i've
          > > run into this very problem. (jsps try to retrieve object from session
          > > that was stored away by controlling servlet, but get a
          > > ClassCastException) is it true that, because weblogic uses different
          > > classloaders for servlets and jsps in a WAR, WARs are essentially
          > > worthless for my app? is there a solution to this? is bea addressing
          > > this too?
          > >
          > > thx
          > > leo
          > >
          >
          >
          >

JSP Compiler and ClassCastException

Have been using JDK1.2.2 from sun since day one and I've been seeing
          ClassCastException since day 1 too.
          Don't think it had anything to do with the compiler.
          "Jun Ying" <[email protected]> wrote in message
          news:[email protected]...
          > I noticed something that might be causing the ClassCastException and has
          not
          > been mentioned: the compiler that is used for jspc. I remember seeing a
          few
          > people mentioning extra classes in the workDir (ie, the bean class that is
          > being used). This is caused by using a smart compiler such as jikes or
          sj.
          > While those compilers will get you more speed for newly modified jsp's,
          they
          > resolve dependencies and recompile all the referenced classes. The result
          > is that the bean class gets recompiled and put into workDir. So no matter
          > where you put the workDir, you end up getting a new copy of the bean class
          > file, which is reloaded by the classloader that loads the newly compiled
          > JSP. That copy of the class file is considered "different" from the one
          > from the normal system classpath or the weblogic.class.path. Thus the
          > ClassCastException. So if you see java classes other than the jsp's in
          the
          > workDir, make sure you are using javac from the sun jdk. So to answer
          > Anish's question, WebLogic is not sticking a copy of the bean class.
          > Rather, it's the java compiler that you are using.
          >
          > Jun Ying
          > Meritsoft, Inc
          >
          >
          > "Michael Boudreau" <[email protected]> wrote in message
          > news:[email protected]...
          > > Hello,
          > >
          > > Well we ran into the same problem here at my company, and we have been
          > > pulling our hair out. I was reading through the jsp 1.1 spec, and
          > > thought I might try using the <jsp:useBean ...> tag instead of the <%@
          > > page import ...> tag. After careful inspection of the resulting .java
          > > file, I found that the <jsp:useBean ...> tag does not put insert any
          > > import statements, but simply declares the bean with the fully
          > > qualified package name. I am sure that this is not new news to anyone;
          > > however, the class cast exception went away (knock on wood, cross
          > > fingers, whatever).
          > >
          > > Basically, my statement looked like this:
          > > <jsp:useBean id="beanname" type="com.company.Class" scope="session" />
          > >
          > > My question is: is there something that I am missing or have not
          > > thought of? Because so far, this "seems" to be working, but I have
          > > been reading posts that say this does not work.
          > >
          > > Oh, one last quick note to BEA. While I was looking at the
          > > generated .java file from the jsp file, I found that weblogic's jspc is
          > > still generating getValue and setValue methods for HttpSession....
          > > which has been deprecated as of the servlet 2.2 spec.
          > >
          > > Michael
          > >
          > >
          > >
          > >
          > > Anish Parvataneni wrote:
          > >
          > > > Hi,
          > > >
          > > > I have a JSP which uses two different classes. Whenever, I change the
          > > > JSP and save it to recompile, there is a ClassCastException. ( I store
          > > > them in the session and load them) . Thats common ! The solution to
          this
          > > > as per documentation is to get rid of the classes in the workingDir of
          > > > JSP. However, I can find ONLY ONE of the classes in the workingDir. I
          > > > delete that class and the JSP works. I change the JSP , problem
          recurrs.
          > > >
          > > > 1. Why does weblogic stick a copy of the class in the workingDir,
          > > > everytime the JSP compiles, although it is available in the weblogic
          > > > classpath ?
          > > > 2. Why is it happening to only one of the classes I use in the JSP ?
          > > > 3. How can I make sure that this class is not available in the
          > > > workingDir, other than deleting it EVERYTIME.
          > > >
          > > > Thanks
          > > > Anish
          > >
          >
          >

JTree addSelectionPath and ClassCastExceptions

Hi.
I'm trying to build a tree view from a list of strings that represent relative path names (ie: Icons\a\image.dds)
I have tokenized the path name based on the file separator and placed it into a String array which is used to create a new TreePath object, but when I try to add the tree path to the tree using tree.addSelectionPath(TreePath) it throws a ClassCastException: java.lang.String.
Is this something I am doing wrong, or is this a problem with java? I have extensively searched the forum and have not found anything that relates to this.
Thanks in advance.

Same question on "model" and "view":
JTable build on top of TableModel, I think the implenmentation of JTable constructor like this: invoke the methods of TableModel and get the rowCount and columnCount number, then according rowCount and columnCount number and "getValueAt()" method build a doulble "for" loop to create vector of vector, then according the vector of vector to build a table and draw the table, are these ideas correct?
The question is every time when we modify the TableModel, we explicitly call "fireTableDataChanged()" method, this method will notify all of the listeners, where are these listeners? did these listeners recall JTable constructor to rebuild the table and draw? if yes, how does this happen? if not, where do we recall double "for" loop? it seems the simple and easys way to recall JTable constructor, but if we rebuild JTable object, how can we notify the JPanel to redraw? it seems lots of mystry on "model" and "view" for me.
The big question is no body answer my questions, it is because my questions so simple, so easy or so stupid, I am new in Java, that's why I have these questions, I need Java professionals to help me!
Thanks for all your help!

Startdrag() and ClassCastException !

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