Question

I have a dll that contains legacy C code, I call this dll via JNI, but sometimes the C code crashes and causes the JVM to terminate. Is it there a way to avoid JVM crash? Can I handle the JNI fault and let the JVM survive? :)

Answer 1

As Timo has said, you have no real alternative but to make the JNI code robust. If you can t do that (for example if you don t have the source) then perhaps you could go for an inter-process solution. Put the JNI code in a separate server process, make RMI or HTTP calls across. If it crashes, restart the "server" but main JVM survives. Obviously there s a performance overhead, and an increase in complexity, but maybe you can afford this?

Answer 2

If it s the C code that is crashing, then the only way to prevent it from taking the JVM with it is to prevent the C code from crashing in the first place. That s one of the main dangers/problems that you get when writing JNI code as it makes the combination of Java and C somewhat more fragile compared to something that is written in pure Java.

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