public Class SystemProperties

Configures the factory class we use to produce instances of org.eclispe.persistence.jpa.Archive These instances are used to examine persistence units and the files within them and are used for discovery of classes in the persistence unit Allows user-provided ArchiveFactory and Archive

This property control which ASM implementation is used for classes bytecode modification.

Allowed Values (case sensitive String):

• "eclipselink" (DEFAULT) - use ASM implementation from org.eclipse.persistence.asm project.
• "ow2" - use ASM implementation from org.ow2.asm project.

This system property in milliseconds can control thread management in org.eclipse.persistence.internal.helper.ConcurrencyManager. It control how much time loop wait before it try acquire lock for current thread again. It value is set above above 0 dead lock detection mechanism and related extended logging will be activated. Default value is 0 (unit is ms). Allowed values are: long

This property control (enable/disable) if ConcurrencyException fired when dead-lock diagnostic is enabled.

Allowed Values (case sensitive String):

• "false" - if aborting frozen thread is not effective it is preferable to not fire the concurrency exception let the system freeze and die and force the administration to kill the server. This is preferable to aborting the transactions multiple times without success in resolving the dead lock and having business critical messages that after 3 JMS retries are discarded out. Failing to resolve a dead lock can have terrible impact in system recovery unless we have infinite retries for the business transactions.
• "true" (DEFAULT) - if we want the to fire up an exception to try to get the current thread to release all of its acquired locks and allow other threads to progress.

This property control (enable/disable) if InterruptedException fired when dead-lock diagnostic is enabled.

Allowed Values (case sensitive String):

• "false" - if aborting frozen thread is not effective it is preferable to not fire the interrupted exception let the system In the places where use this property normally if a thread is stuck it is because it is doing object building. Blowing the threads ups is not that dangerous. It can be very dangerous for production if the dead lock ends up not being resolved because the productive business transactions will become cancelled if the application has a limited number of retries to for example process an MDB. However, the code spots where we use this constant are not as sensible as when the write lock manager is starving to run commit.
• "true" (DEFAULT) - if we want the to fire up an exception to try to get the current thread to release all of its acquired locks and allow other threads to progress.

This property control (enable/disable) collection debug/trace information during ReadLock acquisition, when dead-lock diagnostic is enabled.

Allowed Values (case sensitive String):

• "false" (DEFAULT) - don't collect debug/trace information during ReadLock acquisition
• "true" - collect debug/trace information during ReadLock acquisition. Has negative impact to the performance.

This system property in milliseconds can control thread management in org.eclipse.persistence.internal.helper.ConcurrencyManager. It control how much time ConcurrencyManager will wait before it will identify, that thread which builds new object/entity instance should be identified as a potential dead lock source. It leads into some additional log messages. Default value is 0 (unit is ms). In this case extended logging is not active. Allowed values are: long

This system property in milliseconds can control thread management in org.eclipse.persistence.internal.helper.ConcurrencyManager and org.eclipse.persistence.internal.helper.ConcurrencyUtil. It control how frequently the massive dump log message is created. Default value is 60000 (unit is ms). Allowed values are: long

This system property in milliseconds can control thread management in org.eclipse.persistence.internal.helper.ConcurrencyManager and org.eclipse.persistence.internal.helper.ConcurrencyUtil. It control how frequently the tiny dump log message is created. Default value is 40000 (unit is ms). Allowed values are: long

This system property in milliseconds can control thread management in org.eclipse.persistence.internal.helper.ConcurrencyManager. It control how long we are willing to wait before firing up an exception Default value is 40000 (unit is ms). Allowed values are: long

This property control number of threads in semaphore in org.eclipse.persistence.internal.descriptors.ObjectBuilder If "eclipselink.concurrency.manager.object.building.semaphore" property is true default value is 10. Allowed values are: int If "eclipselink.concurrency.manager.object.building.semaphore" property is false (DEFAULT) number of threads is unlimited.

This property control (enable/disable) semaphore in org.eclipse.persistence.internal.descriptors.ObjectBuilder

• "true" - means we want to override vanilla behavior and use a semaphore to not allow too many threads in parallel to do object building
• "false" (DEFAULT) - means just go ahead and try to build the object without any semaphore (false is vanilla behavior).

This property control (enable/disable) semaphore in org.eclipse.persistence.internal.helper.WriteLockManager#acquireRequiredLocks

• "true" - means we want to override vanilla behavior and use a semaphore to not allow too many threads. In this case there should be negative impact to the performance.
• "false" (DEFAULT) - means just go ahead and try to build the object without any semaphore (false is vanilla behavior).

This property control number of threads in semaphore in org.eclipse.persistence.internal.helper.WriteLockManager#acquireRequiredLocks If "eclipselink.concurrency.manager.write.lock.manager.semaphore" property is true default value is 2. Allowed values are: int If "eclipselink.concurrency.manager.write.lock.manager.semaphore" property is false (DEFAULT) number of threads is unlimited.

This property control timeout between log messages in org.eclipse.persistence.internal.helper.ConcurrencySemaphore#acquireSemaphoreIfAppropriate(boolean) when method/thread tries to get permit for the execution. Default value is 10000 (unit is ms). Allowed values are: long

This property control semaphore the maximum time to wait for a permit in org.eclipse.persistence.internal.helper.ConcurrencySemaphore#acquireSemaphoreIfAppropriate(boolean) It's passed to java.util.concurrent.Semaphore#tryAcquire(long, TimeUnit) Default value is 2000 (unit is ms). Allowed values are: long

This system property can be set to restore ConversionManager behavior with converting LocalDateTime, OffsetDateTime, and OffsetTime types back to using the JVM's default time zone instead of UTC. This restores behavior prior to fixing Bug 538296. This property is ignored if the System Property CONVERSION_USE_TIMEZONE has been set.

This system property can be set the specific time zone used by ConversionManager to convert LocalDateTime, OffsetDateTime, and OffsetTime types.

This property can be set to disable processing of X-Many relationship attributes for Query By Example objects. In previous versions of EclipseLink these attributes would have been ignored but as of this release they will be processed into the expression.

This system property can be set to override target server platform set by the Java EE container with the one either set in persistence.xml or auto detected.

This property can be set to false to enable UPDATE call to set foreign key value in the target row in unidirectional 1-Many mapping with not nullable FK. In previous versions of EclipseLink this was the default behaviour. Allowed values are: true/false.

This property is used in conjunction with org.eclipse.persistence.sessions.IdentityMapAccessor.printIdentityMapLocks(). Setting this property will cause EclipseLink to record the stack trace of the lock acquisition and print it along with the identity map locks. This should only be set if the thread that owns a lock is not 'stuck' but still owns the lock when a normal printIdentityMapLocks is done. This can also be set in code statically through ConcurrencyManager.setShouldTrackStack(true)

This property is used to debug weaving issues. When it is set, weaved classes will be output to the given path as they are weaved

This property can be used to tell EclipseLink to process classes in the ASM Default manner. The fix for bug 370975 changes EclipseLink's weaving support to use ASM itself to examine class hierarchies. Setting this flag to true will cause us to use the default reflection mechanism again. This flag provides a means to workaround any issues encountered with the ASM-based weaving introspection

This property is used in conjunction with WEAVING_OUTPUT_PATH. By default, existing classes on the path provided to WEAVING_OUTPUT_PATH will not be overridden. If this is set to true, they will be