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Class VirtualMachineError

  extended by java.lang.Throwable
      extended by java.lang.Error
          extended by java.lang.VirtualMachineError
All Implemented Interfaces:
Direct Known Subclasses:
InternalError, OutOfMemoryError, StackOverflowError, UnknownError
See Also:
Top Examples, Source Code

public VirtualMachineError()
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public VirtualMachineError(String s)
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[1879]Signals and Java dumps
By Anonymous on 2007/05/03 10:43:21  Rate
What have Java dumps got to do with signals? If the JVM terminates abnormally, such as when a SIGSEGV condition occurs, a Java core dump will be generated. This dump contains useful information, including the reason for the termination, environment data, the state of each thread, and more. 
 A useful feature of the JVM is the ability for a Java core dump to be generated on demand. On a Windows platform you can do this by typing CTRL-BREAK, which sends a SIGBREAK signal to the application. On Unix type platforms you send a SIGQUIT signal to the application  ( this will usually be with CTRL-V or CTRL-\, depending on the platform, or command: kill -s SIGQUIT  < process id >  ) . Java core dumps generated this way can be particularly useful when a lockup is suspected. A useful technique for debugging lockups is taking two Java core dumps, one immediately after the other, and looking for differences. 
 From a signal handling point of view, for Unix type platforms a Java core dump contains the list of platform signals and identifies the installed signal handler for each.  ( However, for z/OS only the library containing the signal handler is referenced. )  If you have an application that uses signal handlers, then a Java core dump can be useful to determine which function  ( or library )  is actually being used as the handler. For Java signal handlers the handler identified in a Java core dump should be the JVM's intrDispatchMD (  )  function, from library libhpi. 

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