ANT throwing exception

Question

My enviromental variables are set like this

ANT_HOME=c:\\ant1.6 JAVA_HOME=c:jdk.16

and path includes both %JAVA_HOME%/bin and %ANT_HOME%/bin

still when i execute ant -version from command prompt it thows an exception like below dont know why its doing that

java.lang.NoClassDefFoundError: org/apache/tools/ant/launch/AntMain
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:14
1)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at sun.misc.Launcher$ExtClassLoader.findClass(Launcher.java:229)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:295)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:295)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:244)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)
Caused by: java.lang.ClassNotFoundException: org.apache.tools.ant.launch.AntMain

at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at sun.misc.Launcher$ExtClassLoader.findClass(Launcher.java:229)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 17 more

Answer 1

看来类路径中缺少ant-launcher.jar ，这是与主ant.jar分开的依赖ant.jar 。