This sub-section describes how to check the occurrence of OutOfMemoryError and the effects of the same.

<INDEXWORD PRONOUNCE="functiontosuppresseffectonbusiness" INDEXITEM="function to suppress effect on business">Function to supress the effect on business</INDEXWORD>

When the memory becomes insufficient due to reasons like the heap size of JavaVM has exceeded upper limit, the "java.lang.OutOfMemoryError" message is displayed. Set the following function to minimize the impact of the OutOfMemoryError on business.

• Force quit function when OutOfMemory occurs
  This is the function to forcefully end J2EE server when OutOfMemoryError occurs. Setting this function forcefully ends the J2EE server and performs automatic restart to enable normal operation. Thus you can control the impact of OutOfMemoryError occurrence on the business which the OutOfMemory has not occurred.
  
• OutOfMemory handling function
  This function is for continuing the execution of J2EE server, even when you are using the force quit function when OutOfMemory occurs. By setting this function, only the business, with an insufficient memory is stopped. As a result, other businesses without the OutOfMemoryError occurrence are continued.
  

  Note

  In spite of setting the OutOfMemory handling function, if the OutOfMemoryError error occurs while executing the businesses which use the following components, the J2EE server system crashes and all the processes are interrupted. Since you cannot cancel only the business with insufficient memory, you must be very careful.

  • Standard reception (MDB (WS-R))
  • Standard reception (MDB (DB queue))
  • MDB (WS-R) adapter
  • MDB (DB queue) adapter
  • Asynchronous business process

<INDEXWORD PRONOUNCE="pointstobeconsideredduringuocexecution" INDEXITEM="points to be considered during UOC execution">Points to be considered during UOC execution</INDEXWORD>

The resources which are reserved during the execution of UOC are not released even after the process ends. The resulting increase in the load of the entire system makes Java heap insufficient which may lead to the occurrence of OutOfMemoryError.

The following functions use UOC and executing these functions, may lead to the occurrence of the OutOfMemoryError. To prepare for OutOfMemoryError, you must implement processes such as process to release resources appropriately and error processing such as rollback at the time of creating UOC.

• Invoke Java activity
• User-defined function
• Character code conversion UOC
• Component-common UOC
• Custom reception
• General custom adapter