[CR #273313] The Message Bridge GUI creates an mb4j.lock file for your default project in the MessageBridge subdirectory. A project is a set of files containing information about imported schemas and code generation settings. The default project is automatically opened and maintained by the GUI.
If the lock file already exists when a new GUI instance is started, the following message appears:
Another instance of Message Bridge for Java (TM) has already opened the project and is still running.
When you close this message, the GUI shuts down. When the original GUI instance is closed, the lock file is removed and another GUI instance may be started.
Under unusual circumstances, such as an out-of-memory error, the Java virtual machine may abort without giving the GUI a chance to remove the lock file.
Workaround: In this case, you must remove the lock file manually. The lock file is a zero-length file which can be deleted like any other file.
WARNING! Deleting the lock file when it is legitimately protecting the project may cause corruption of the project.
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