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I have two questions :
What if I have a JNI call to a method and the JNI method leaks memory. Once this method completes will the JVM Garbage collector be able to get that memory back. I heard that the JVM does not manage the Heap Space used by JNI ? But the memory used by JNI is a part of the memory used by the Java process ?
Is it absolutely necessary to use JNI to achieve IPC ? What are the other popular Java techniques or is there a Open Source Library to achieve Shared memory in Java ?
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A JNI library can easily cause the Java program to exceed its maximum specified heap.
Native memory is the memory provided to the application process by the operating system. The memory is used for heap storage and other purposes. The native memory information available in the native memory perspective view varies by platform but typically includes the following information: Table 1.
The only way to discover JNI memory leaks is to use a heap-dump tool that explicitly marks native references. If possible, you should not use any global references. It's better to assign the desired object to the field of a normal Java class.
JNI provides functions for accessing the contents of array objects. While arrays of objects must be accessed one entry at a time, arrays of primitives can be read and written directly as if they were declared in C.
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