Unable to load the class set in the humantask as a callback Class

I am getting the below error when I set a class bpel.StockReview.MyCallback in my humantask as a callback on some update on the task. The class is getting packed with the jar properly and gets deployed to the server directory. However when I initiate the BPEL proc and run it, the class is notfound/ not laoded into the system. Below are the logs -
<2009-04-27 15:19:09,207> <ERROR> <default.collaxa.cube.services> <::>      at java.lang.Class.forName0(Native Method)
<2009-04-27 15:19:09,207> <ERROR> <default.collaxa.cube.services> <::>      at java.lang.Class.forName(Class.java:164)
<2009-04-27 15:19:09,207> <ERROR> <default.collaxa.cube.services> <::>      at oracle.bpel.services.workflow.task.impl.RoutingSlipCallbackInvoker.executeJavaOnTaskCompleted(RoutingSlipCallbackInvoker.java:204)
<2009-04-27 15:19:09,207> <ERROR> <default.collaxa.cube.services> <::>      ... 49 more
<2009-04-27 15:19:09,207> <ERROR> <oracle.bpel.services.workflow> <::>
     Missing class: bpel.StockReview.MyCallback
     Dependent class: oracle.bpel.services.workflow.task.impl.RoutingSlipCallbackInvoker
     Loader: oracle.bpel.common:10.1.3
     Code-Source: /D:/product_OAS/10.1.3.1/OracleAS_1/bpel/system/services/lib/bpm-services.jar
     Configuration: <code-source> in /D:/product_OAS/10.1.3.1/OracleAS_1/j2ee/home/config/server.xml
This load was initiated at oracle.bpel.common:10.1.3 using the Class.forName() method.
The missing class is not available from any code-source or loader in the system.
oracle.classloader.util.AnnotatedClassNotFoundException:
     Missing class: bpel.StockReview.MyCallback
     Dependent class: oracle.bpel.services.workflow.task.impl.RoutingSlipCallbackInvoker
     Loader: oracle.bpel.common:10.1.3
     Code-Source: /D:/product_OAS/10.1.3.1/OracleAS_1/bpel/system/services/lib/bpm-services.jar
     Configuration: <code-source> in /D:/product_OAS/10.1.3.1/OracleAS_1/j2ee/home/config/server.xml
This load was initiated at oracle.bpel.common:10.1.3 using the Class.forName() method.
The missing class is not available from any code-source or loader in the system.
     at oracle.classloader.PolicyClassLoader.handleClassNotFound (PolicyClassLoader.java:2068) [D:/product_OAS/10.1.3.1/OracleAS_1/j2ee/home/lib/pcl.jar (from system property java.class.path), by sun.misc.Launcher$AppClassLoader@10469011]
     at oracle.classloader.PolicyClassLoader.internalLoadClass (PolicyClassLoader.java:1679) [D:/product_OAS/10.1.3.1/OracleAS_1/j2ee/home/lib/pcl.jar (from system property java.class.path), by sun.misc.Launcher$AppClassLoader@10469011]
     at oracle.classloader.PolicyClassLoader.loadClass (PolicyClassLoader.java:1635) [D:/product_OAS/10.1.3.1/OracleAS_1/j2ee/home/lib/pcl.jar (from system property java.class.path), by sun.misc.Launcher$AppClassLoader@10469011]
     at oracle.classloader.PolicyClassLoader.loadClass (PolicyClassLoader.java:1620) [D:/product_OAS/10.1.3.1/OracleAS_1/j2ee/home/lib/pcl.jar (from system property java.class.path), by sun.misc.Launcher$AppClassLoader@10469011]
     at java.lang.ClassLoader.loadClassInternal (ClassLoader.java:319) [jre bootstrap, by jre.bootstrap:1.5.0_06]
     at java.lang.Class.forName0 (Native method) [unknown, by unknown]
     at java.lang.Class.forName (Class.java:164) [jre bootstrap, by jre.bootstrap:1.5.0_06]
     at oracle.bpel.services.workflow.task.impl.RoutingSlipCallbackInvoker.executeJavaOnTaskCompleted (RoutingSlipCallbackInvoker.java:204) [D:/product_OAS/10.1.3.1/OracleAS_1/bpel/system/services/lib/bpm-services.jar (from <code-source> in /D:/product_OAS/10.1.3.1/OracleAS_1/j2ee/home/config/server.xml), by oracle.bpel.common:10.1.3]
     at oracle.bpel.services.workflow.task.impl.RoutingSlipCallbackInvoker.onTaskComplete (RoutingSlipCallbackInvoker.java:102) [D:/product_OAS/10.1.3.1/OracleAS_1/bpel/system/services/lib/bpm-services.jar (from <code-source> in /D:/product_OAS/10.1.3.1/OracleAS_1/j2ee/home/config/server.xml), by oracle.bpel.common:10.1.3]
     at oracle.bpel.services.workflow.task.impl.TaskService.invokeCallbacks (TaskService.java:3096) [D:/product_OAS/10.1.3.1/OracleAS_1/bpel/system/services/lib/bpm-services.jar (from <code-source> in /D:/product_OAS/10.1.3.1/OracleAS_1/j2ee/home/config/server.xml), by oracle.bpel.common:10.1.3]
     at oracle.bpel.services.workflow.task.impl.TaskService.performPostActionOperation (TaskService.java:3345) [D:/product_OAS/10.1.3.1/OracleAS_1/bpel/system/services/lib/bpm-services.jar (from <code-source> in /D:/product_OAS/10.1.3.1/OracleAS_1/j2ee/home/config/server.xml), by oracle.bpel.common:10.1.3]
     at oracle.bpel.services.workflow.task.impl.TaskService.localHandleRoutingSlipInterpretationResult (TaskService.java:1239) [D:/product_OAS/10.1.3.1/OracleAS_1/bpel/system/services/lib/bpm-services.jar (from <code-source> in /D:/product_OAS/10.1.3.1/OracleAS_1/j2ee/home/config/server.xml), by oracle.bpel.common:10.1.3]
     at oracle.bpel.services.workflow.task.impl.TaskService.handleRoutingSlipInterpretationResult (TaskService.java:1298) [D:/product_OAS/10.1.3.1/OracleAS_1/bpel/system/services/lib/bpm-services.jar (from <code-source> in /D:/product_OAS/10.1.3.1/OracleAS_1/j2ee/home/config/server.xml), by oracle.bpel.common:10.1.3]
     at oracle.bpel.services.workflow.task.impl.TaskService.evaluateRoutingSlipTaskAssignment (TaskService.java:1173) [D:/product_OAS/10.1.3.1/OracleAS_1/bpel/system/services/lib/bpm-services.jar (from <code-source> in /D:/product_OAS/10.1.3.1/OracleAS_1/j2ee/home/config/server.xml), by oracle.bpel.common:10.1.3]
     at oracle.bpel.services.workflow.task.impl.TaskService.updateTaskOutcomeAndEvaluateRoutingSlip (TaskService.java:1129) [D:/product_OAS/10.1.3.1/OracleAS_1/bpel/system/services/lib/bpm-services.jar (from <code-source> in /D:/product_OAS/10.1.3.1/OracleAS_1/j2ee/home/config/server.xml), by oracle.bpel.common:10.1.3]
     at oracle.bpel.services.workflow.task.impl.TaskService.updateTaskOutcome (TaskService.java:941) [D:/product_OAS/10.1.3.1/OracleAS_1/bpel/system/services/lib/bpm-services.jar (from <code-source> in /D:/product_OAS/10.1.3.1/OracleAS_1/j2ee/home/config/server.xml), by oracle.bpel.common:10.1.3]
     at oracle.bpel.services.workflow.task.impl.TaskService.updateTaskOutcome (TaskService.java:920) [D:/product_OAS/10.1.3.1/OracleAS_1/bpel/system/services/lib/bpm-services.jar (from <code-source> in /D:/product_OAS/10.1.3.1/OracleAS_1/j2ee/home/config/server.xml), by oracle.bpel.common:10.1.3]
     at oracle.bpel.services.workflow.task.ejb.TaskServiceBean.updateTaskOutcome (TaskServiceBean.java:410) [D:/product_OAS/10.1.3.1/OracleAS_1/bpel/system/services/lib/bpm-services.jar (from <code-source> in /D:/product_OAS/10.1.3.1/OracleAS_1/j2ee/home/config/server.xml), by oracle.bpel.common:10.1.3]
     at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native method) [unknown, by unknown]

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