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POUndefined Reference Trying to invoke Java from C++
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  1. POUndefined Reference Trying to invoke Java from C++
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    copied!<p>I am trying to create a Java virtual machine from C++ and invoke the main method passing a String argument to the main method of the Java program. I am following this example found on Sun's website: <a href="http://java.sun.com/docs/books/jni/html/invoke.html#11202" rel="nofollow">http://java.sun.com/docs/books/jni/html/invoke.html#11202</a></p> <p>Here is the simple Java Program:</p> <pre><code>public class TestJNIInvoke { public static void main(String[] args) { System.out.println(args[0]); } } </code></pre> <p>Here is the C++ program I am using to (try to) invoke the JVM:</p> <pre><code>#include &lt;jni.h&gt; #include &lt;cstdlib&gt; using namespace std; int main() { JNIEnv *env; JavaVM *jvm; jint res; jclass cls; jmethodID mid; jstring jstr; jclass stringClass; jobjectArray args; JavaVMInitArgs vm_args; JavaVMOption* options = new JavaVMOption[1]; //LINE 18 ERROR options[0].optionString = (char*)&amp;"-Djava.class.path=C:\\Program Files\\Java\\jdk1.7.0\\bin"; vm_args.version = JNI_VERSION_1_6; vm_args.nOptions = 1; vm_args.options = options; vm_args.ignoreUnrecognized = false; /* load and initialize a Java VM, return a JNI interface * pointer in env */ res = JNI_CreateJavaVM(&amp;jvm, (void**)&amp;env, &amp;vm_args); //LINE 26 ERROR if (res &lt; 0) { fprintf(stderr, "Can't create Java VM\n"); exit(1); } cls = env-&gt;FindClass("TestJNIInvoke"); if (cls == NULL) { goto destroy; } mid = env-&gt;GetStaticMethodID(cls, "main", "([Ljava/lang/String;)V"); if (mid == NULL) { goto destroy; } jstr = env-&gt;NewStringUTF(" from CPP!"); if (jstr == NULL) { goto destroy; } stringClass = env-&gt;FindClass("java/lang/String"); args = env-&gt;NewObjectArray(1, stringClass, jstr); if (args == NULL) { goto destroy; } env-&gt;CallStaticVoidMethod(cls, mid, args); destroy: if (env-&gt;ExceptionOccurred()) { env-&gt;ExceptionDescribe(); } jvm-&gt;DestroyJavaVM(); } </code></pre> <p>Anyway If I just compile the file with:</p> <pre><code>gcc -I"c:\Program Files\Java\jdk1.7.0\include" -I"c:\Program Files\Java\jdk1.7.0\include\win32" -c TestJNIInvoke.cpp </code></pre> <p>It compiles fine, but when I try to compile and link:</p> <pre><code>gcc -I"c:\Program Files\Java\jdk1.7.0\include" -I"c:\Program Files\Java\jdk1.7.0\include\win32" -g TestJNIInvoke.cpp </code></pre> <p>I get two weird errors that I don't understand:</p> <pre><code>TestJNIInvoke.cpp:18: undefined reference to `operator new[](unsigned int)' TestJNIInvoke.cpp:26: undefined reference to `_imp__JNI_CreateJavaVM@12' collect2: ld returned 1 exit status </code></pre> <p>I marked the lines in the above code where the error is occuring, has anyone encountered this problem before? </p> <p>Any ideas/links would be great</p> <p>Thanks</p>
 

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