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JVM crashes while executing native code (DLL) [message #531489]

Wed, 05 May 2010 08:36

Carlos

Messages: 52
Registered: September 2009

Member

Hi.

I have a DLL with C++ code, which execute native code for launching XSLT transformations. Besides, that DLL also executes code for invokin g other scripting language for other application based in COM.

My problem is that sometimes, when that code native is executed, the Java Virtual Machine raise a fatal error and crashes. I have tried to use the exception system of JNI but it doesn't work. I mean, it seems that the DLL try to access a forbbiden memmory zone or something like that.

Because of the control while DLL is executing is out of JVM, I don't know how could I catch that error...
Do you think that executing the native code in a especific thread (not in the main therad) will be useful to avoid the crash?

In other case, is there any method for showing a Message Dialog before the crash?

Have you got any suggestions about this issue?

Thanks in advance.
Regards,
Carlos.

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Re: JVM crashes while executing native code (DLL) [message #531849 is a reply to message #531489]

Thu, 06 May 2010 11:41

Carlos

Messages: 52
Registered: September 2009

Member

Hi.

The solution consists firstable in catching the C++ exception with a try-catch block like the next:

try{
.....
.....
}catch(_com_error &e) {
printf("Error : %s\n",
(const char*)_bstr_t(e.Description()));
return -1;
}

Later on, there has to use the JNI exception system for throwing the C exception and let the Java Virtual Machine catch it. The next C++ code let the JNI method throw a exception which will be understood by JVM.

jclass newExcCls;
newExcCls = (*env).FindClass("java/lang/Exception");
(*env).ThrowNew(newExcCls, "Thrown from C++ code");

The class which load the DLL into the JVM must declare the native JNI method the exception that will throw.

Best regards,
Carlos.

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