Java example source code file (check_version.c)

This example Java source code file (check_version.c) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

jni_onload, jni_version_1_2, jnicall, jnienv, jniexport, jvm_getinterfaceversion, jvm_interface_version

The check_version.c Java example source code

/*
 * Copyright (c) 1998, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

#include "jni.h"
#include "jvm.h"

JNIEXPORT jint JNICALL
JNI_OnLoad(JavaVM *vm, void *reserved)
{
    jint vm_version = JVM_GetInterfaceVersion();
    if (vm_version != JVM_INTERFACE_VERSION) {
        JNIEnv *env;
        char buf[128];
        sprintf(buf, "JVM interface version mismatch: expecting %d, got %d.",
                JVM_INTERFACE_VERSION, (int)vm_version);
        (*vm)->GetEnv(vm, (void **)&env, JNI_VERSION_1_2);
        if (env) {
            (*env)->FatalError(env, buf);
        }
    }
    return JNI_VERSION_1_2;
}