使用launch4j将jar转换为exe后出现JNI错误

Question

以下是日志：

Exception in thread "main" java.lang.UnsupportedClassVersionError: fluidDynamicsProject/FluidDynamicSerial 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.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 java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)

Answer 1

这意味着launch4j用来运行程序的JVM版本比编译类FluidDynamicsProject/FluidDynamicSerial的编译器版本要晚。您可以尝试在launchj4配置文件中设置最低版本：

<?xml version="1.0" encoding="UTF-8"?>
<launch4jConfig>
  ...
  <jre>
    ...
    <minVersion>11.0</minVersion>
    ...
  </jre>
</launch4jConfig>

注意，launch4j可能不支持最新版本的Java。

否则，您可以降低用于编译类的目标版本。