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public void businessMethod() throws EJBException { //perform important logic boolean returnValue = performBusinessFunction(); try { //evaluate success of logic if( returnValue ){ //do something else } else{ //force immediate rollback throw new SystemException( "Condition failed, rolling back"); } }catch( CustomException ce ) { throw new EJBException( ce ); } }

The following is the cp command that comes the closest to duplicating the test directory:

Firstly, Spring Web Flow treats conversational scope as a first-level citizen. It was designed from the ground up with that as the centerpiece. The core artifact within Spring Web Flow is the flow (or conversation). It is this flow definition that defines a blueprint for a conversation

Transactions are automatically rolled back if a system exception is thrown at any time during the transaction. System exceptions are the RuntimeException and any of its subclasses. Because system exceptions are runtime exceptions, they do not need to be declared in the method declaration. If a system exception is thrown from within the method that started the transaction, the transaction is rolled back. If a client started the transaction, the client s transaction is marked for rollback. Using system exceptions to force rollbacks does have certain, important side effects. When the container catches a system exception, it rolls back the transaction, logs the exception, and discards the EJB that originated the exception. For stateless session and entity beans, losing a bean instance is not that important, since a new one will be identical in every way for the client. However, losing a reference to a stateful bean will cause a client to lose the state it might have accumulated in that bean.

The -R option tells cp to recurse through the directory structure it is copying; the -p option preserves permissions, ownership, and access and modification times of the original files. The copy is based on the access rights of the user performing the copy. However, the actual functionality of the cp command falls short of expectations. Symbolic links in the destination directory are created with the modification time noting when the copy was performed, not when the original files were created, although this shouldn t be a significant issue since the actual files that are linked keep their original modification time. The main issue with the cp command is that hard links are not maintained. Hard links are copied as individual files; they are not treated as links to the same file. This may result in a significant storage issue if you have many hard links whose copies no longer conserve disk space as duplicate files. Newer versions of the cp command have an -a switch. This option preserves as many source-file attributes as possible, including hard links.

with the user. Conversations can execute in parallel without intruding on each other, and when the conversation has finished, all allocated resources are automatically cleaned up.

5.3 Rolling back the current transaction 5.8 Managing EJB state at transaction boundaries 5.10 Managing EJB state after a rollback

NICS=`netstat -i | awk '{print $1}' | \ egrep -vi "Kernel|Iface|Name|lo" | sort -u` NIC_COUNT=`netstat -i | awk '{print $1}' | \ egrep -v "Kernel|Iface|Name|lo" | sort -u | wc -l`

Secondly, Spring Web Flow is deliberately abstracted away from the Servlet specification. The core artifacts within Spring Web Flow are flows, states, actions, and views. As you will see, there is nothing web-specific about a flow definition; the flow itself could be describing a set of web pages, a set of windows in a GUI, or even the communication between disparate systems. At no point within Spring Web Flow are you presented with an HttpServletRequest or an HttpServletResponse.

A particular transaction appears to be taking longer than expected and you need to impose time limits on it. In other words, for a transaction to be considered successful, it must execute in a predefined time limit. Using time limits is a good way to discover performance-related errors. For example, even if your application transactions are completing successfully but they are unusually slow, they should be flagged as errors. If an executing transaction exceeds a certain time, it should be considered in an error state, and any completed work should be rolled back.

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