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java.sql.SQLException: Error in allocating a connection. Cause: Class name is wrong or classpath is not set for : org.gjt.mm.mysql.jdbc2.optional.MysqlDataSource	at com.sun.gjc.spi.DataSource.getConnection(DataSource.java:74)	at com.sun.jdo.spi.persistence.support.sqlstore.ejb.TransactionHelperImpl.getConnection(TransactionHelperImpl.java:181)	at com.sun.jdo.spi.persistence.support.sqlstore.ejb.EJBHelper.getConnection(EJBHelper.java:166)	at com.sun.jdo.spi.persistence.support.sqlstore.impl.SQLPersistenceManagerFactory.getConnection(SQLPersistenceManagerFactory.java:892)	at com.sun.jdo.spi.persistence.support.sqlstore.impl.SQLPersistenceManagerFactory.initializeSQLStoreManager(SQLPersistenceManagerFactory.java:857)	at com.sun.jdo.spi.persistence.support.sqlstore.impl.SQLPersistenceManagerFactory.getFromPool(SQLPersistenceManagerFactory.java:786)	at com.sun.jdo.spi.persistence.support.sqlstore.impl.SQLPersistenceManagerFactory.getPersistenceManager(SQLPersistenceManagerFactory.java:673)	at com.sun.jdo.spi.persistence.support.sqlstore.impl.PersistenceManagerFactoryImpl.getPersistenceManager(PersistenceManagerFactoryImpl.java:849)	at com.sun.jdo.spi.persistence.support.sqlstore.impl.PersistenceManagerFactoryImpl.getPersistenceManager(PersistenceManagerFactoryImpl.java:681)	at ejb.CustomersBean_2122496195_ConcreteImpl.jdoGetPersistenceManager(CustomersBean_2122496195_ConcreteImpl.java:862)	at ejb.CustomersBean_2122496195_ConcreteImpl.ejbFindByPrimaryKey(CustomersBean_2122496195_ConcreteImpl.java:417)	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.sun.enterprise.security.SecurityUtil.invoke(SecurityUtil.java:147)	at com.sun.ejb.containers.EntityContainer.invokeFindByPrimaryKey(EntityContainer.java:738)	at com.sun.ejb.containers.EJBLocalHomeInvocationHandler.invoke(EJBLocalHomeInvocationHandler.java:181)	at $Proxy15.findByPrimaryKey(Unknown Source)	at ejb.CustomerFacadeBean.getCompanyInfo(CustomerFacadeBean.java:73)	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.sun.enterprise.security.SecurityUtil$2.run(SecurityUtil.java:153)	at java.security.AccessController.doPrivileged(Native Method)	at com.sun.enterprise.security.application.EJBSecurityManager.doAsPrivileged(EJBSecurityManager.java:950)	at com.sun.enterprise.security.SecurityUtil.invoke(SecurityUtil.java:158)	at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(EJBObjectInvocationHandler.java:128)	at $Proxy18.getCompanyInfo(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at com.sun.corba.ee.impl.presentation.rmi.ReflectiveTie._invoke(ReflectiveTie.java:123)	at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatchToServant(CorbaServerRequestDispatcherImpl.java:648)	at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatch(CorbaServerRequestDispatcherImpl.java:192)	at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequestRequest(CorbaMessageMediatorImpl.java:1709)	at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:1569)	at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleInput(CorbaMessageMediatorImpl.java:951)	at com.sun.corba.ee.impl.protocol.giopmsgheaders.RequestMessage_1_2.callback(RequestMessage_1_2.java:181)	at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:721)	at com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImpl.dispatch(SocketOrChannelConnectionImpl.java:469)	at com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImpl.doWork(SocketOrChannelConnectionImpl.java:1258)	at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:409)