摘要：Error: A JNI error has occurred, please check your installation and try againException in thread "main" java.lang.UnsupportedClass
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/google/javascript/jscomp/CommandLineRunner has been compiled by a more recent version of the java Runtime (class file version 65.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at Java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
编辑
-js_output_file output.js
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/google/javascript/jscomp/CommandLineRunner has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Compiler（Google 的 JavaScript 优化编译器）本身没直接关系。
编辑
编辑
这个 JNI 错误出现的原因通常是：
Java 程序运行时需要加载一个包含 JNI（Java Native Interface）调用的类库（.dll、.so、.dylib），但找不到或加载失败。可能是你运行的 Java 程序里，某个依赖底层调用了 C/C++ 代码，而这个 native 库没有被正确打包或放到系统可加载路径。你的文字提到 Closure Compiler，它本身是 Java 写的，编译 JS 时不会用到 JNI，但如果你的构建脚本里还调用了其他工具（比如 Node.js插件、加壳 / 加密工具），就可能触发 JNI 相关的加载。JS 加密 / 混淆防止代码被直接阅读和复制（比如前端逻辑、游戏脚本）。减少被逆向分析的风险，保护算法或业务逻辑。配合压缩，减少文件体积、提高加载速度。JNI 的意义让 Java 程序能调用 C/C++ 代码，处理 Java 不擅长的底层操作（高性能计算、硬件交互、加密算法加速）。某些加密算法为了防逆向，会把核心逻辑放在 native 层，这样比纯 Java/JS 更难被反编译。有时是为了兼容已有的 C/C++ 库，不必用 Java 重写。如果你愿意，我可以帮你分析一下，你这段 JNI 错误是在 Closure Compiler 执行 JS 编译时触发的，还是在其他阶段，这样就能判断它到底是构建环境的问题还是加密 / 混淆插件导致的。
你要我帮你定位一下吗？这样可以直接找出触发 JNI 的模块。
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来源：晓勇游戏安利
