实例文档说的很清楚,只要设置正确的CLASSPATH
我设置的是CLASSPATH=E:\lucene-2.9.0\lucene-core-2.9.0.jar;E:\lucene-2.9.0\lucene-demos-2.9.0,我解压的目录,还有设置过CLASSPATH=.;E:\lucene-2.9.0可是每次的异常都是Exception in thread "main" java.lang.NoClassDefFoundError: java
Caused by: java.lang.ClassNotFoundException: java
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Could not find the main class: java. Program will exit.
我设置的是CLASSPATH=E:\lucene-2.9.0\lucene-core-2.9.0.jar;E:\lucene-2.9.0\lucene-demos-2.9.0,我解压的目录,还有设置过CLASSPATH=.;E:\lucene-2.9.0可是每次的异常都是Exception in thread "main" java.lang.NoClassDefFoundError: java
Caused by: java.lang.ClassNotFoundException: java
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Could not find the main class: java. Program will exit.
解决方案 »
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试试
But I run Helloworld,there is a Exception as following!Caused by: java.lang.ClassNotFoundException: Helloworld
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Could not find the main class: Helloworld. Program will exit.I suspect some security issues!
重新设置java_home,path,classpath