有什么不对我的蚂蚁配置？ [英] What is wrong with my ant configuration?

问题描述

我用yum在Fedora 5台机器上安装了Ant，但蚂蚁不会启动。我得到这个错误信息：

I installed Ant on a Fedora 5 machine using yum, but Ant does not launch. I get this error message:

[bash]# ant
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/tools/ant/launch/Launcher
Caused by: java.lang.ClassNotFoundException: org.apache.tools.ant.launch.Launcher
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
Could not find the main class: org.apache.tools.ant.launch.Launcher.  Program will exit.

我已经设置了以下环境变量：

I have set the following environment variables:

JAVA_HOME = /usr/java/latest
ANT_HOME = /usr/bin

蚂蚁安装在的/ usr /斌/蚂蚁。

我也碰到过这个帖子，它似乎是在 JAVAVER_LIBDIR 变量没有指向的东西存在。我设置一个符号链接，像后建议清除问题为作者，但它并没有解决的事情对我来说。

I have also come across this post, and it seems that the JAVAVER_LIBDIR variable does not point to something that exists. I set a symbolic link, like the post suggests cleared the issue up for the author, but it did not fix things for me.

[bash]# sudo ln -s /usr/share/java /usr/share/java-1.6.0

编辑：我还设置了与 JAVAVER_JNIDIR 变量解决了类似的问题的符号链接：

I have also set a symbolic link that addressed a similar problem with the JAVAVER_JNIDIR variable:

[bash]# sudo ln -s /usr/lib/java /usr/lib/java-1.6.0

我现在得到一个不同的错误信息：

I now get a different error message:

[bash]# ant --execdebug
/usr/bin/build-classpath: error: Could not find jaxp_parser_impl Java extension for this JVM
/usr/bin/build-classpath: error: Could not find xml-commons-apis Java extension for this JVM
/usr/bin/build-classpath: error: Some specified jars were not found
exec "/usr/java/latest/bin/java" -classpath "/usr/share/java-1.6.0/ant.jar:/usr/share/java-1.6.0/ant-launcher.jar:/usr/java/latest/lib/tools.jar" -Dant.home="/usr" -Dant.library.dir="/usr/lib" org.apache.tools.ant.launch.Launcher -cp ""
Buildfile: build.xml does not exist!
Build failed

关以谷歌这些错误消息...

Off to Google these error messages...

推荐答案

我刚刚遇到了类似的问题在Fedora 18。

I've just met similar issue on Fedora 18.

为了使长话短说，运行：

To make long story short, run:

sudo mkdir /usr/lib/java-1.7.0 /usr/share/java-1.7.0

显然，这个问题是特定于的java-1.7.0-的OpenJDK ，因为类似的空的所有其他的JDK版本目录存在。

Apparently, this problem is specific to java-1.7.0-openjdk because similar empty directories for all other JDK versions existed.

详情

运行后有单行误差蚂蚁：

Error: Could not find or load main class org.apache.tools.ant.launch.Launcher

问题是在某处的/ usr /共享/ Java的utils的/ Java的功能脚本试图设置 JAVAVER_JNIDIR / JAVAVER_LIBDIR 变量指的就是上述目录。由于不适当的错误信息重定向到stdout，一些变量有像分配：

The problem was somewhere in /usr/share/java-utils/java-functions script which tried to set JAVAVER_JNIDIR/JAVAVER_LIBDIR variables to refer to the directories above. Due to inappropriate error message redirection to stdout, some variables got assignments like:

LOCALCLASSPATH='/usr/bin/build-classpath: error: JAVAVER_JNIDIR /usr/lib/java-1.7.0 does not exist or is not a directory'

根据所有其他的Java版本设置约定创建的目录是干净的解决方案。

Creating the directories according to the convention set by all other java versions is the cleanest solution.

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