JES2 messages (similar to all MVS™ messages) contain various elements. All messages contain a unique identifying number, some messages contain non-variable text, others contain variable text (the text is based on the specific error condition or status), others contain specific reason codes (a numeric value - the explanation of which is documented in z/OS JES2 Messages) and some contain combinations of the preceding elements. Based on the message number, reason code value or variable text, the system can interpret the status and have a programmable console automatically issue the required commands to respond to the situation. Additional IBM® products, such as NetView® and System Automation for z/OS® (SA z/OS), can be installed to automate your operation based on your policies regarding the handling of particular message or error conditions. ,

For example, System Automation for z/OS can be used to issue the appropriate JES2 commands to relieve a spool shortage condition or issue the appropriate MVS command(s) to complete the shutdown of JES2 after a serious error condition.