Using JNI to execute a java jar from a C++ program, using g++ or eclipse

I'm trying to call / execute a java jar from a C++ program. Here are the options I've found so far: ``` Use JNI Use Jace Use JunC++ion Use execl("java", "java", "-jar", "myprog.jar", NULL); Use execlp("java", "java", "-jar", "myprog.jar", (char *)0); Use system("java filename.jar"); Use popen("java -jar test.jar text1 text2", "r"); Use CreateProcess(...); Use JNA ``` I'd like to use JNI, however I'm running into problems. ======================== Hello.cpp I have a simple Hello.cpp class: ``` #include <iostream> #include <jni.h> using namespace std; int main() { cout << "Hello World" << endl; // prints Hello World JavaVM *jvm; /* denotes a Java VM */ JNIEnv *env; /* pointer to native method interface */ JDK1_1InitArgs vm_args; /* JDK 1.1 VM initialization arguments */ vm_args.version = 0x00010001; /* New in 1.1.2: VM version */ /* Get the default initialization arguments and set the class * path */ JNI_GetDefaultJavaVMInitArgs(&vm_args); vm_args.classpath = "/home/FinishedJars/HelloWorld/hello2.jar"; /* load and initialize a Java VM, return a JNI interface * pointer in env */ JNI_CreateJavaVM(&jvm, &env, &vm_args); /* invoke the Main.test method using the JNI */ jclass cls = env->FindClass("Main"); jmethodID mid = env->GetStaticMethodID(cls, "test", "(I)V"); env->CallStaticVoidMethod(cls, mid, 100); /* We could have created an Object and called methods on it instead */ /* We are done. */ jvm->DestroyJavaVM(); return 0; } ``` ======================== Compile And when I try to compile with something like: ``` g++ -I /usr/lib/jvm/jdk1.6.0_34-x86/include/ Hello.cpp ``` Note: I found "jni.h" in that folder, so I included it. I'm assuming that's the right spot, but I'm not certain I get a ton of errors ( see below ) ======================== Errors I get a million errors from jni.h, as if it's trying to compile jni.h: ``` /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::SetStaticLongField(_jclass*, _jfieldID*, int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1568: error: ‘const struct JNINativeInterface_’ has no member named ‘SetStaticLongField’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::SetStaticFloatField(_jclass*, _jfieldID*, jfloat)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1572: error: ‘const struct JNINativeInterface_’ has no member named ‘SetStaticFloatField’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::SetStaticDoubleField(_jclass*, _jfieldID*, jdouble)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1576: error: ‘const struct JNINativeInterface_’ has no member named ‘SetStaticDoubleField’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘_jstring* JNIEnv_::NewString(const jchar*, int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1580: error: ‘const struct JNINativeInterface_’ has no member named ‘NewString’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘const jchar* JNIEnv_::GetStringChars(_jstring*, jboolean*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1586: error: ‘const struct JNINativeInterface_’ has no member named ‘GetStringChars’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::ReleaseStringChars(_jstring*, const jchar*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1589: error: ‘const struct JNINativeInterface_’ has no member named ‘ReleaseStringChars’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘_jstring* JNIEnv_::NewStringUTF(const char*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1593: error: ‘const struct JNINativeInterface_’ has no member named ‘NewStringUTF’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘const char* JNIEnv_::GetStringUTFChars(_jstring*, jboolean*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1599: error: ‘const struct JNINativeInterface_’ has no member named ‘GetStringUTFChars’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::ReleaseStringUTFChars(_jstring*, const char*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1602: error: ‘const struct JNINativeInterface_’ has no member named ‘ReleaseStringUTFChars’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘_jobjectArray* JNIEnv_::NewObjectArray(int, _jclass*, _jobject*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1611: error: ‘const struct JNINativeInterface_’ has no member named ‘NewObjectArray’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘_jobject* JNIEnv_::GetObjectArrayElement(_jobjectArray*, int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1614: error: ‘const struct JNINativeInterface_’ has no member named ‘GetObjectArrayElement’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::SetObjectArrayElement(_jobjectArray*, int, _jobject*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1618: error: ‘const struct JNINativeInterface_’ has no member named ‘SetObjectArrayElement’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘_jbooleanArray* JNIEnv_::NewBooleanArray(int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1622: error: ‘const struct JNINativeInterface_’ has no member named ‘NewBooleanArray’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘_jbyteArray* JNIEnv_::NewByteArray(int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1625: error: ‘const struct JNINativeInterface_’ has no member named ‘NewByteArray’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘_jcharArray* JNIEnv_::NewCharArray(int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1628: error: ‘const struct JNINativeInterface_’ has no member named ‘NewCharArray’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘_jshortArray* JNIEnv_::NewShortArray(int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1631: error: ‘const struct JNINativeInterface_’ has no member named ‘NewShortArray’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘_jintArray* JNIEnv_::NewIntArray(int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1634: error: ‘const struct JNINativeInterface_’ has no member named ‘NewIntArray’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘_jlongArray* JNIEnv_::NewLongArray(int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1637: error: ‘const struct JNINativeInterface_’ has no member named ‘NewLongArray’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘_jfloatArray* JNIEnv_::NewFloatArray(int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1640: error: ‘const struct JNINativeInterface_’ has no member named ‘NewFloatArray’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘_jdoubleArray* JNIEnv_::NewDoubleArray(int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1643: error: ‘const struct JNINativeInterface_’ has no member named ‘NewDoubleArray’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘jboolean* JNIEnv_::GetBooleanArrayElements(_jbooleanArray*, jboolean*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1647: error: ‘const struct JNINativeInterface_’ has no member named ‘GetBooleanArrayElements’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘jchar* JNIEnv_::GetCharArrayElements(_jcharArray*, jboolean*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1653: error: ‘const struct JNINativeInterface_’ has no member named ‘GetCharArrayElements’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘jshort* JNIEnv_::GetShortArrayElements(_jshortArray*, jboolean*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1656: error: ‘const struct JNINativeInterface_’ has no member named ‘GetShortArrayElements’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘jfloat* JNIEnv_::GetFloatArrayElements(_jfloatArray*, jboolean*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1665: error: ‘const struct JNINativeInterface_’ has no member named ‘GetFloatArrayElements’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘jdouble* JNIEnv_::GetDoubleArrayElements(_jdoubleArray*, jboolean*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1668: error: ‘const struct JNINativeInterface_’ has no member named ‘GetDoubleArrayElements’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::ReleaseBooleanArrayElements(_jbooleanArray*, jboolean*, int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1674: error: ‘const struct JNINativeInterface_’ has no member named ‘ReleaseBooleanArrayElements’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::ReleaseByteArrayElements(_jbyteArray*, int*, int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1679: error: ‘const struct JNINativeInterface_’ has no member named ‘ReleaseByteArrayElements’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::ReleaseCharArrayElements(_jcharArray*, jchar*, int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1684: error: ‘const struct JNINativeInterface_’ has no member named ‘ReleaseCharArrayElements’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::ReleaseShortArrayElements(_jshortArray*, jshort*, int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1689: error: ‘const struct JNINativeInterface_’ has no member named ‘ReleaseShortArrayElements’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::ReleaseIntArrayElements(_jintArray*, int*, int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1694: error: ‘const struct JNINativeInterface_’ has no member named ‘ReleaseIntArrayElements’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::ReleaseLongArrayElements(_jlongArray*, int*, int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1699: error: ‘const struct JNINativeInterface_’ has no member named ‘ReleaseLongArrayElements’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::ReleaseFloatArrayElements(_jfloatArray*, jfloat*, int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1704: error: ‘const struct JNINativeInterface_’ has no member named ‘ReleaseFloatArrayElements’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::ReleaseDoubleArrayElements(_jdoubleArray*, jdouble*, int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1709: error: ‘const struct JNINativeInterface_’ has no member named ‘ReleaseDoubleArrayElements’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::GetBooleanArrayRegion(_jbooleanArray*, int, int, jboolean*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1714: error: ‘const struct JNINativeInterface_’ has no member named ‘GetBooleanArrayRegion’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::GetByteArrayRegion(_jbyteArray*, int, int, int*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1718: error: ‘const struct JNINativeInterface_’ has no member named ‘GetByteArrayRegion’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::GetCharArrayRegion(_jcharArray*, int, int, jchar*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1722: error: ‘const struct JNINativeInterface_’ has no member named ‘GetCharArrayRegion’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::GetShortArrayRegion(_jshortArray*, int, int, jshort*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1726: error: ‘const struct JNINativeInterface_’ has no member named ‘GetShortArrayRegion’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::GetIntArrayRegion(_jintArray*, int, int, int*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1730: error: ‘const struct JNINativeInterface_’ has no member named ‘GetIntArrayRegion’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::GetLongArrayRegion(_jlongArray*, int, int, int*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1734: error: ‘const struct JNINativeInterface_’ has no member named ‘GetLongArrayRegion’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::GetFloatArrayRegion(_jfloatArray*, int, int, jfloat*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1738: error: ‘const struct JNINativeInterface_’ has no member named ‘GetFloatArrayRegion’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::GetDoubleArrayRegion(_jdoubleArray*, int, int, jdouble*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1742: error: ‘const struct JNINativeInterface_’ has no member named ‘GetDoubleArrayRegion’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::SetBooleanArrayRegion(_jbooleanArray*, int, int, const jboolean*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1747: error: ‘const struct JNINativeInterface_’ has no member named ‘SetBooleanArrayRegion’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::SetByteArrayRegion(_jbyteArray*, int, int, int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1751: error: ‘const struct JNINativeInterface_’ has no member named ‘SetByteArrayRegion’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1751: error: ‘buf’ was not declared in this scope /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::SetCharArrayRegion(_jcharArray*, int, int, const jchar*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1755: error: ‘const struct JNINativeInterface_’ has no member named ‘SetCharArrayRegion’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::SetShortArrayRegion(_jshortArray*, int, int, const jshort*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1759: error: ‘const struct JNINativeInterface_’ has no member named ‘SetShortArrayRegion’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::SetIntArrayRegion(_jintArray*, int, int, int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1763: error: ‘const struct JNINativeInterface_’ has no member named ‘SetIntArrayRegion’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1763: error: ‘buf’ was not declared in this scope /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::SetLongArrayRegion(_jlongArray*, int, int, int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1767: error: ‘const struct JNINativeInterface_’ has no member named ‘SetLongArrayRegion’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1767: error: ‘buf’ was not declared in this scope /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::SetFloatArrayRegion(_jfloatArray*, int, int, const jfloat*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1771: error: ‘const struct JNINativeInterface_’ has no member named ‘SetFloatArrayRegion’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::SetDoubleArrayRegion(_jdoubleArray*, int, int, const jdouble*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1775: error: ‘const struct JNINativeInterface_’ has no member named ‘SetDoubleArrayRegion’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::GetStringRegion(_jstring*, int, int, jchar*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1798: error: ‘const struct JNINativeInterface_’ has no member named ‘GetStringRegion’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::GetStringUTFRegion(_jstring*, int, int, char*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1801: error: ‘const struct JNINativeInterface_’ has no member named ‘GetStringUTFRegion’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void* JNIEnv_::GetPrimitiveArrayCritical(_jarray*, jboolean*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1805: error: ‘const struct JNINativeInterface_’ has no member named ‘GetPrimitiveArrayCritical’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::ReleasePrimitiveArrayCritical(_jarray*, void*, int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1808: error: ‘const struct JNINativeInterface_’ has no member named ‘ReleasePrimitiveArrayCritical’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘const jchar* JNIEnv_::GetStringCritical(_jstring*, jboolean*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1812: error: ‘const struct JNINativeInterface_’ has no member named ‘GetStringCritical’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::ReleaseStringCritical(_jstring*, const jchar*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1815: error: ‘const struct JNINativeInterface_’ has no member named ‘ReleaseStringCritical’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘_jobject* JNIEnv_::NewWeakGlobalRef(_jobject*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1819: error: ‘const struct JNINativeInterface_’ has no member named ‘NewWeakGlobalRef’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void JNIEnv_::DeleteWeakGlobalRef(_jobject*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1822: error: ‘const struct JNINativeInterface_’ has no member named ‘DeleteWeakGlobalRef’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘jboolean JNIEnv_::ExceptionCheck()’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1826: error: ‘const struct JNINativeInterface_’ has no member named ‘ExceptionCheck’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘_jobject* JNIEnv_::NewDirectByteBuffer(void*, int)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1830: error: ‘const struct JNINativeInterface_’ has no member named ‘NewDirectByteBuffer’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘void* JNIEnv_::GetDirectBufferAddress(_jobject*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1833: error: ‘const struct JNINativeInterface_’ has no member named ‘GetDirectBufferAddress’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: In member function ‘jobjectRefType JNIEnv_::GetObjectRefType(_jobject*)’: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1839: error: ‘const struct JNINativeInterface_’ has no member named ‘GetObjectRefType’ /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h: At global scope: /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1851: error: ‘jint’ does not name a type /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1853: error: ‘jint’ does not name a type /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1859: error: ‘jint’ does not name a type /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1877: error: ‘JNICALL’ has not been declared /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1877: error: ISO C++ forbids declaration of ‘jint’ with no type /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1877: error: ‘jint’ declared as function returning a function /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1879: error: ‘JNICALL’ has not been declared /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1879: error: ISO C++ forbids declaration of ‘jint’ with no type /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1879: error: ‘jint’ declared as function returning a function /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1881: error: ‘JNICALL’ has not been declared /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1881: error: ISO C++ forbids declaration of ‘jint’ with no type /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1881: error: ‘jint’ declared as function returning a function /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1883: error: ‘JNICALL’ has not been declared /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1883: error: ‘jint’ has not been declared /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1883: error: ISO C++ forbids declaration of ‘jint’ with no type /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1883: error: ‘jint’ declared as function returning a function /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1885: error: ‘JNICALL’ has not been declared /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1885: error: ISO C++ forbids declaration of ‘jint’ with no type /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1885: error: ‘jint’ declared as function returning a function /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1892: error: ‘jint’ does not name a type /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1895: error: ‘jint’ does not name a type /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1898: error: ‘jint’ does not name a type /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1902: error: ‘jint’ does not name a type /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1905: error: ‘jint’ does not name a type /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1916: error: ‘JNIIMPORT’ does not name a type /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1919: error: ‘JNIIMPORT’ does not name a type /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1922: error: ‘JNIIMPORT’ does not name a type /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1926: error: ‘JNIEXPORT’ does not name a type /usr/lib/jvm/jdk1.6.0_34-x86/include/jni.h:1929: error: expected constructor, destructor, or type conversion before ‘void’ 2013-03-21-1356-Hello-GCC-Ex.cpp: In function ‘int main()’: 2013-03-21-1356-Hello-GCC-Ex.cpp:19: error: ‘JDK1_1InitArgs’ was not declared in this scope 2013-03-21-1356-Hello-GCC-Ex.cpp:19: error: expected ‘;’ before ‘vm_args’ 2013-03-21-1356-Hello-GCC-Ex.cpp:20: error: ‘vm_args’ was not declared in this scope 2013-03-21-1356-Hello-GCC-Ex.cpp:23: error: ‘JNI_GetDefaultJavaVMInitArgs’ was not declared in this scope 2013-03-21-1356-Hello-GCC-Ex.cpp:27: error: ‘JNI_CreateJavaVM’ was not declared in this scope 2013-03-21-1356-Hello-GCC-Ex.cpp:34: error: ‘struct JavaVM_’ has no member named ‘DestroyJavaVM’ ``` ======================== More Information: I have tried this with eclipse, by creating creating an executable empty gcc project, creating my hello world code, and it works fine. After that, I added the jni code, and imported the source by: Right click project -> properties -> C/C++ General -> Paths and Symbols -> Includes -> GNU C++ -> Add -> then adding the directory that contains the jni.h When I try to build it this way, in eclipse, I get the exact same errors. Also, I'm running on Ubuntu 10 64bit... ======================== Can someone help? It could be a very simple importing problem, but I'm not sure ======================== UPDATE 1 Running: `g++ -I /usr/lib/jvm/jdk1.7.0_06/include/ -I /usr/lib/jvm/jdk1.7.0_06/include/linux/ Hello.cpp` Gives me: ``` Hello.cpp: In function ‘int main()’: Hello.cpp:19: error: ‘JDK1_1InitArgs’ was not declared in this scope Hello.cpp:19: error: expected ‘;’ before ‘vm_args’ Hello.cpp:20: error: ‘vm_args’ was not declared in this scope ``` ======================== UPDATE 2 Apparently JDK1_1InitArgs was removed in JDK 6, so I compiled with the JDK 5 jni.h like this: `g++ -I /usr/lib/jvm/jdk1.5.0_22-x86/include/ -I /usr/lib/jvm/jdk1.5.0_22-x86/include/linux/ Hello.cpp` and it gives me: ``` Hello.cpp: In function ‘int main()’: Hello.cpp:24: warning: deprecated conversion from string constant to ‘char*’ Hello.cpp:27: error: invalid conversion from ‘JNIEnv**’ to ‘void**’ Hello.cpp:27: error: initializing argument 2 of ‘jint JNI_CreateJavaVM(JavaVM**, void**, void*)’ ``` ======================== UPDATE 3 I've been doing some research and possible solutions are: - Add -L/usr/X11R6/lib, or where-ever the X11 libraries are, to the g++ command... had no effect. - Add the paths of ibhpi.so and libjvm.so to the LD_LIBRARY_PATH (for me it's at /usr/lib/jvm/jdk1.5.0_22-x86/jre/lib/i386/native_threads/)... had no effect - Add libjava.so to the LD_LIBRARY_PATH as well (mine is at /usr/lib/jvm/jdk1.5.0_22-x86/jre/lib/i386/)... had no effect - Add jre/lib to the LD_LIBRARY_PATH... had no effect One of my final build commands (still not working, though) ``` g++ -g -I /usr/lib/jvm/jdk1.5.0_22-x86/include/ -I /usr/lib/jvm/jdk1.5.0_22-x86/include/linux/ -L/usr/lib/jvm/jdk1.5.0_22-x86/jre/lib/i386/ Hello.cpp ``` ERROR: ``` Hello.cpp:23: undefined reference to `JNI_GetDefaultJavaVMInitArgs' Hello.cpp:27: undefined reference to `JNI_CreateJavaVM' ``` I changed &env to (void**)&env, suggested by ldav1s to get rid of the void star error ======================== UPDATE 4 I believe the problem is that I am trying to load libraries not built for my system?... My current command is: ``` g++ -L/usr/lib/jvm/jdk1.5.0_22-x86/lib -L/usr/lib/jvm/jdk1.5.0_22-x86/jre/lib -L/usr/lib/jvm/jdk1.5.0_22-x86/jre/lib/i386 -ljava -L/usr/lib/jvm/jdk1.5.0_22-x86/jre/lib/i386/native_threads -lhpi -L/usr/lib/jvm/jdk1.5.0_22-x86/jre/lib/i386/server -ljvm -I /usr/lib/jvm/jdk1.5.0_22-x86/include/ -I /usr/lib/jvm/jdk1.5.0_22-x86/include/linux/ Hello.cpp ``` and am getting: ``` ... /usr/bin/ld: skipping incompatible /usr/lib/jvm/jdk1.5.0_22-x86/jre/lib/i386/libjava.so when searching for -ljava /usr/bin/ld: skipping incompatible /usr/lib/jvm/jdk1.5.0_22-x86/jre/lib/i386/native_threads/libhpi.so when searching for -lhpi /usr/bin/ld: skipping incompatible /usr/lib/jvm/jdk1.5.0_22-x86/jre/lib/i386/server/libjvm.so when searching for -ljvm /usr/bin/ld: cannot find -ljava /usr/bin/ld: cannot find -lhpi /usr/bin/ld: cannot find -ljvm ... ``` ======================== UPDATE 5 / SOLUTION Took me a while, but this gives me the least number of errors! ``` g++ -fPIC -L/usr/lib/jvm/java-6-openjdk/jre/lib -L/usr/lib/jvm/java-6-openjdk/jre/lib/amd64 -ljava -lverify -L/usr/lib/jvm/java-6-openjdk/jre/lib/amd64/native_threads -lhpi -L/usr/lib/jvm/java-6-openjdk/jre/lib/amd64/server -ljvm -I /usr/lib/jvm/jdk1.5.0_22-x86/include/ -I /usr/lib/jvm/jdk1.5.0_22-x86/include/linux/ Hello.cpp ``` Warnings: ``` Hello.cpp: In function ‘int main()’: Hello.cpp:24: warning: deprecated conversion from string constant to ‘char* ``` Note: before running remember to add the amd libs to LD_LIBRARY_PATH: ``` $ export LD_LIBRARY_PATH=/usr/lib/jvm/java-6-openjdk/jre/lib/amd64:$LD_LIBRARY_PATH $ export LD_LIBRARY_PATH=/usr/lib/jvm/java-6-openjdk/jre/lib/amd64/native_threads:$LD_LIBRARY_PATH $ export LD_LIBRARY_PATH=/usr/lib/jvm/java-6-openjdk/jre/lib/amd64/server:$LD_LIBRARY_PATH $ export LD_LIBRARY_PATH=/usr/lib/jvm/java-6-openjdk/jre/lib:$LD_LIBRARY_PATH ``` THANKS!