Hi All,
I've written a sample EJB which takes two ints and returns an int. Its a
stateless Session Bean. Everything works out well. I deploy it using
j2ee.My client can contact the bean and could get the result.
Now, I modified the code and put a method which creates a sample Cloudscape
db. And when i run the client I get this exception in the client window.
Caught an unexpected exception!
java.rmi.ServerException: RemoteException occurred in server thread; nested
exception is:
java.rmi.RemoteException: Unknown Exception/Error thrown by EJB
method.;
nested exception is:
java.lang.NoClassDefFoundError
java.rmi.RemoteException: Unknown Exception/Error thrown by EJB method.;
nested
exception is:
java.lang.NoClassDefFoundError
java.lang.NoClassDefFoundError
<>
And the error log says:
java.rmi.RemoteException: Unknown Exception/Error thrown by EJB method.;
nested exception is:
java.lang.ExceptionInInitializerError
java.lang.ExceptionInInitializerError:
java.security.AccessControlException: access denied
(java.lang.RuntimePermission modifyThreadGroup)
at
java.security.AccessControlContext.checkPermission(AccessControlContext.java
:272)
at
java.security.AccessController.checkPermission(AccessController.java:399)
at
java.lang.SecurityManager.checkPermission(SecurityManager.java:545)
at
com.sun.enterprise.J2EESecurityManager.checkAccess(J2EESecurityManager.java:
53)
at java.lang.ThreadGroup.checkAccess(ThreadGroup.java:279)
at java.lang.Thread.init(Thread.java:265)
at java.lang.Thread.(Thread.java:449)
at COM.jbms._44._1076.run(Unknown Source)
at COM.cloudscape.core.MonitorBoot.start(Unknown Source)
at COM.cloudscape.core.JDBCBoot.boot(Unknown Source)
at COM.cloudscape.core.JDBCDriver.boot(Unknown Source)
at COM.cloudscape.core.JDBCDriver.(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:120)
at MyBeanEJB.writeData(MyBeanEJB.java:15)
at MyBeanEJB.add(MyBeanEJB.java:9)
at MyBeanEJB_EJBObjectImpl.add(MyBeanEJB_EJBObjectImpl.java:19)
at _MyBeanEJB_EJBObjectImpl_Tie._invoke(Unknown Source)
at
com.sun.corba.ee.internal.POA.GenericPOAServerSC.dispatchToServant(GenericPO
AServerSC.java:423)
at
com.sun.corba.ee.internal.POA.GenericPOAServerSC.internalDispatch(GenericPOA
ServerSC.java:137)
at
com.sun.corba.ee.internal.POA.GenericPOAServerSC.dispatch(GenericPOAServerSC
.java:98)
at com.sun.corba.ee.internal.iiop.ORB.process(ORB.java:227)
at
com.sun.corba.ee.internal.iiop.CachedWorkerThread.doWork(IIOPConnection.java
:262)
at
com.sun.corba.ee.internal.iiop.CachedWorkerThread.run(IIOPConnection.java:23
0)
javax.naming.NameNotFoundException: Subcontext: MyBean_MyBeanEJB_MyBeanJNDI
not found
<>
javax.naming.NameNotFoundException: Subcontext: MyBean_MyBeanEJB_MyBeanJNDI
not found
<>
java.lang.NoClassDefFoundError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:120)
at MyBeanEJB.writeData(MyBeanEJB.java:15)
at MyBeanEJB.add(MyBeanEJB.java:9)
at MyBeanEJB_EJBObjectImpl.add(MyBeanEJB_EJBObjectImpl.java:19)
at _MyBeanEJB_EJBObjectImpl_Tie._invoke(Unknown Source)
at
com.sun.corba.ee.internal.POA.GenericPOAServerSC.dispatchToServant(GenericPO
AServerSC.java:423)
at
com.sun.corba.ee.internal.POA.GenericPOAServerSC.internalDispatch(GenericPOA
ServerSC.java:137)
at
com.sun.corba.ee.internal.POA.GenericPOAServerSC.dispatch(GenericPOAServerSC
.java:98)
at com.sun.corba.ee.internal.iiop.ORB.process(ORB.java:227)
at
com.sun.corba.ee.internal.iiop.CachedWorkerThread.doWork(IIOPConnection.java
:262)
at
com.sun.corba.ee.internal.iiop.CachedWorkerThread.run(IIOPConnection.java:23
0)
java.rmi.RemoteException: Unknown Exception/Error thrown by EJB method.;
nested exception is:
java.lang.NoClassDefFoundError
java.lang.NoClassDefFoundError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:120)
at MyBeanEJB.writeData(MyBeanEJB.java:15)
at MyBeanEJB.add(MyBeanEJB.java:9)
at MyBeanEJB_EJBObjectImpl.add(MyBeanEJB_EJBObjectImpl.java:19)
at _MyBeanEJB_EJBObjectImpl_Tie._invoke(Unknown Source)
at
com.sun.corba.ee.internal.POA.GenericPOAServerSC.dispatchToServant(GenericPO
AServerSC.java:423)
at
com.sun.corba.ee.internal.POA.GenericPOAServerSC.internalDispatch(GenericPOA
ServerSC.java:137)
at
com.sun.corba.ee.internal.POA.GenericPOAServerSC.dispatch(GenericPOAServerSC
.java:98)
at com.sun.corba.ee.internal.iiop.ORB.process(ORB.java:227)
at
com.sun.corba.ee.internal.iiop.CachedWorkerThread.doWork(IIOPConnection.java
:262)
at
com.sun.corba.ee.internal.iiop.CachedWorkerThread.run(IIOPConnection.java:23
0)
And my code is (MyBeanEJB.java):
import java.sql.*;
import java.rmi.RemoteException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
public class MyBeanEJB implements SessionBean{
public int add(int a,int b) throws RemoteException{
writeData();
return a+b;
}
public void writeData(){
try{
Class.forName("COM.cloudscape.core.JDBCDriver");
Connection con =
DriverManager.getConnection("jdbc:cloudscape:RajitDB;create=true");
con.setAutoCommit(false);
Statement s = con.createStatement();
s.execute("create table SampleTable(name
varchar(40),num data)");
s.execute("Insert into SampleTable
values('Rajit',20)");
s.execute("Insert into SampleTable
values('Mr.Guy',20)");
con.commit();
s.close();
con.close();
}
catch(Exception ex){
ex.printStackTrace();
}
}
public MyBeanEJB() {}
public void ejbCreate() {}
public void ejbRemove() {}
public void ejbActivate() {}
public void ejbPassivate() {}
public void setSessionContext(SessionContext sc) {}
}
I could as well have written an entity bean for handling the database
transaction. But can I not do the same thing in a stateless SessionBean?
I have all the required jars and classes in my CLASSPATH.
Please help me with this,
regards,
Rajit.
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