Concurrency Exceptions (2001 – 2006)

ConcurrencyException is a development exception that is raised when a Java concurrency violation occurs. Only when a running thread is interrupted, causing the JVM to throw an InterruptedException, is an internal exception information displayed with the error message, as shown in Example 13-2.

Format

EXCEPTION [TOPLINK – error code]: Exception name
EXCEPTION DESCRIPTION: Message
INTERNAL EXCEPTION: Message

Example 13-2 Concurrency Exception

EXCEPTION [TOPLINK – 2004]: oracle.toplink.exceptions.ConcurrencyException
EXCEPTION DESCRIPTION: Signal attempted before wait on concurrency manager. 
This usually means that an attempt was made to commit or roll back a transaction before being started, or rolled back twice.

2001: WAIT_WAS_INTERRUPTED: Cause: In a multi threaded environment, one of the waiting threads was interrupted.; Action: Such exceptions are dependent on the application.

2002: WAIT_FAILURE_SERVER: Cause: A request for a connection from the connection pool has been forced to wait, and that wait has been interrupted.; Action: Such exceptions are dependent on the application.

2003: WAIT_FAILURE_CLIENT: Cause: A request for a connection from the connection pool has been forced to wait, and that wait has been interrupted.; Action: Such exceptions are dependent on the application.

2004: SIGNAL_ATTEMPTED_BEFORE_WAIT: Cause: A signal was attempted before a wait on concurrency manager. This usually means that an attempt was made to commit or roll back a transaction before it was started, or to rollback a transaction twice.; Action: Verify transactions in the application.

2005: WAIT_FAILURE_SEQ_DATABASE_SESSION: Cause: An InterruptedException was raised while DatabaseSession sequencing waited for a separate connection to become available.; Action: Examine concurrency issues involving object creation with your DatabaseSession.

2006: SEQUENCING_MULTITHREAD_THRU_CONNECTION: Cause: Several threads attempted to concurrently obtain sequence objects from the same DatabaseSession or ClientSession.; Action: Avoid concurrent writing through the same DatabaseSession or ClientSession.