没有生成java堆转储

Question

没有在outofmemoryerror上获得java堆转储： 试过这个（one.exe是我的java rcp应用程序）：

one.exe -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=C:\Temp

但没有帮助，文件夹路径是可访问的。我甚至尝试过像heap.hprof这样的名字，但没有结果。有人可以在这里指导我吗？

Answer 1

-XX:+HeapDumpOnOutOfMemoryError Command-line Option If you specify the -XX:+HeapDumpOnOutOfMemoryError command-line option, and if an OutOfMemoryError is thrown, the VM generates a heap dump

This above argument says it will generate HeapDump when OOM is thrown. If the JVM argument is passed to JVM and no heap dump got generated then it implies the application yet to suffer OutOfMemory condition.If you need confirmation then take native stderr log file of the application to check did application suffers any OOM? or include -verbose:gc jvm argument and collect verbose logs and check the last cycle of the GC to check the free bytes of the java heap.

Answer 2

一些抛出的堆溢出不是真正的溢出，而是在计算后直接抛出。实际上，没有溢出。例如DirectByteBuffer（使用allocateMemory）