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Java报错信息 java.lang.SecurityException: Prohibited package name: java.xxx 

package java.yun.System;

public class SystemOut {
public static void main(String[] args) {
System.out.println("输出");
}
}

报错信息

java.XXXXXXXXX
java.lang.SecurityException: Prohibited package name: java.XXXXX
    at java.lang.ClassLoader.preDefineClass(ClassLoader.java:658)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:794)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)
Exception in thread "main" 
Process finished with exit code 1

原因 JVM 禁止包的开头为 java

解决方法 请自行脑补。