错误信息如下:
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorld/HelloWorld
(wrong name: HelloWorld)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClassSecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)文件结构为:HelloWorld文件夹下HelloWorld.java、HelloWorld.class;并且命令行方式java HelloWorld能够正确执行。与HelloWorld文件夹同级生成helloworld.jar文件。MENIFEST.mf内容为:HelloWorld.HelloWorld环境变量classpath中设置为:.;C:\jdk150_04\lib;
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorld/HelloWorld
(wrong name: HelloWorld)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClassSecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)文件结构为:HelloWorld文件夹下HelloWorld.java、HelloWorld.class;并且命令行方式java HelloWorld能够正确执行。与HelloWorld文件夹同级生成helloworld.jar文件。MENIFEST.mf内容为:HelloWorld.HelloWorld环境变量classpath中设置为:.;C:\jdk150_04\lib;
请将tools.jar和dt.jar都加到classpath中。
或者MAIN()没有初始化
创建环境变量:
JAVA_HOME=C:\jdk150_04;
PATH=%JAVA_HOME%\bin;%PATH%
CLASSPATH=.;%JAVA_HOME%\lib祝你好运!!!
现已解决:打包时路径不对。