J2ee + EJB + Weblogic Exception8.1 + OutOfMemoryError

Hi,
I am getting OutOfMemoryError while my application is running on Weblogic8.1,
Pls help me to sort out the following problem:
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EJB Exception: ; nested exception is:
      java.lang.OutOfMemoryError
java.rmi.RemoteException: EJB Exception: ; nested exception is:
      java.lang.OutOfMemoryError
      at weblogic.ejb20.internal.EJBRuntimeUtils.throwRemoteException(Ljava.lang.String;Ljava.lang.Throwable;)V(EJBRuntimeUtils.java:102)
      at weblogic.ejb20.internal.BaseEJBHome.handleSystemException(Lweblogic.ejb20.internal.InvocationWrapper;Ljava.lang.Throwable;)V(BaseEJBHome.java:296)
      at weblogic.ejb20.internal.BaseEJBObject.postInvoke(Lweblogic.ejb20.internal.InvocationWrapper;Ljava.lang.Throwable;)V(BaseEJBObject.java:263)
      at weblogic.ejb20.internal.StatelessEJBObject.postInvoke(Lweblogic.ejb20.internal.InvocationWrapper;Ljava.lang.Throwable;)V(StatelessEJBObject.java:140)