Core Java™ 2 Volume II - Advanced Features, Seventh Edition

Handling Errors

Native methods are a significant security risk to programs in the Java programming language. The C runtime system has no protection against array bounds errors, indirection through bad pointers, and so on. It is particularly important that programmers of native methods handle all error conditions to preserve the integrity of the Java platform. In particular, when your native method diagnoses a problem that it cannot handle, then it should report this problem to the Java virtual machine. Then, you would naturally throw an exception in this situation. However, C has no exceptions. Instead, you must call the Throw or ThrowNew function to create a new exception object. When the native method exits, the Java virtual machine throws ...