CODEWITHSUNDEEP
javac++jvmjavaagents
Rabbit0w0
Rabbit0w0

Reputation: 105

JVM cannot find Agent_OnLoad in agent lib

I am coding a Java Agent library. However, the JVM cannot find Agent_OnLoad function even if I have explicitly exported it in my C++ code.

JNIEXPORT jint JNICALL
    Agent_OnLoad(JavaVM* vm, char* options, void* reserved)
{
    return JNI_OK;
}

It then says Could not find Agent_OnLoad function in the agent library: ./FuncTest.dll. The start-up command line is java -agentpath:./FuncTest.dll -jar .\helloworld.jar

Using Visual Studio 2022, Corretto 17.0.8

Upvotes: 0

Views: 272

Answers (1)

Rabbit0w0
Rabbit0w0

Reputation: 105

Name decoration is applied to the exported function name.

By editing it to

extern "C" {
    JNIEXPORT jint JNICALL
        Agent_OnLoad(JavaVM* vm, char* options, void* reserved)
    {
        return JNI_OK;
    }
}

solves the problem.

See How to specify a "clean" name of DLL exports? for a detailed answer.

Upvotes: 1

Related Questions