I was using ojdbc14.jar file in the lib file...I deleted that jar file and 
copied the classes12.jar ..but now iam getting this new error..
its unrelated error to my class....
13:16:19,052 INFO  [WebappClassLoader] Illegal access: this web application inst
ance has been stopped already.  Could not load org.hsqldb.jdbcDriver.  The event
ual following stack trace is caused by an error thrown for debugging purposes as
 well as to attempt to terminate the thread which caused the illegal access, and
 has no functional impact.
13:16:19,052 WARN  [JBossManagedConnectionPool] Throwable while attempting to ge
t a new connection: null
java.lang.ThreadDeath
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoa
der.java:1221)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoa
der.java:1181)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:217)
        at java.sql.DriverManager.getCallerClass(DriverManager.java:440)
        at java.sql.DriverManager.getDrivers(DriverManager.java:336)
        at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:294)
        at org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory.c
reateManagedConnection(LocalManagedConnectionFactory.java:151)
        at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.cr
eateConnectionEventListener(InternalManagedConnectionPool.java:508)
        at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.ge
tConnection(InternalManagedConnectionPool.java:207)
        at org.jboss.resource.connectionmanager.JBossManagedConnectionPool$BaseP
ool.getConnection(JBossManagedConnectionPool.java:534)
        at org.jboss.resource.connectionmanager.BaseConnectionManager2.getManage
dConnection(BaseConnectionManager2.java:395)
        at org.jboss.resource.connectionmanager.TxConnectionManager.getManagedCo
nnection(TxConnectionManager.java:297)
        at org.jboss.resource.connectionmanager.BaseConnectionManager2.allocateC
onnection(BaseConnectionManager2.java:447)
        at org.jboss.resource.connectionmanager.BaseConnectionManager2$Connectio
nManagerProxy.allocateConnection(BaseConnectionManager2.java:874)
        at org.jboss.resource.adapter.jdbc.WrapperDataSource.getConnection(Wrapp
erDataSource.java:103)
        at com.exelixis.plateloader.ProcessBarcodeAction.execute(ProcessBarcodeA

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