问题描述
我正在尝试安装 SOLR 并运行ant 示例"构建过程很远但随后出现错误:
I am trying to install SOLR and running "ant example" The build gets pretty far but then gives an error:
/root/apache-solr-3.2.0/solr/common-build.xml:250: The following error occurred while executing this line:
/root/apache-solr-3.2.0/lucene/contrib/contrib-build.xml:58: The following error occurred while executing this line:
/root/apache-solr-3.2.0/lucene/common-build.xml:298: The following error occurred while executing this line:
/root/apache-solr-3.2.0/lucene/common-build.xml:733: Unable to find a javac compiler;
com.sun.tools.javac.Main is not on the classpath.
Perhaps JAVA_HOME does not point to the JDK.
It is currently set to "/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre"
我已经明确设置了 JAVA_HOME(见下文)
I have explicity set JAVA_HOME (see below)
# echo $JAVA_HOME
/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/
但是，当我运行 ant 时 JAVA_HOME 显示为/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre 而不是 # echo $JAVA_HOME/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/.我无法弄清楚这是在哪里设置的.我还设置了 ANT_HOME，因为它在其他一些帖子中说明这可能会解决问题.
However the JAVA_HOME when I run ant is showing as/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre instead of # echo $JAVA_HOME/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/ . I cannot figure out where this is being set. I also set ANT_HOME as it was stated in some other posts that this might fix the issue.
# echo $ANT_HOME
/usr/share/ant/
这也不能解决问题.
推荐答案
好的，我能够解决我遇到的问题.我已经设置了 JAVA_HOME，但没有设置为系统环境变量.
OK, I was able to solve the problem I was having. I had set JAVA_HOME, but not as a system environment variable.
基本上，ant 正在生成一个新进程并且没有选择我设置的任何 shell 变量.因此，虽然我当前的 shell 可以看到 $JAVA_HOME，但当 ant 运行时却看不到.这是布赖恩·凯利 (Brian Kelly) 对以下问题的有益评论:
Basically, ant was spawning a new process and wasn't picking up any of the shell variables I had set. So while my current shell could see $JAVA_HOME, when ant was running it could not. It was Brian Kelly's helpful comment on the question of:
What does java.home show if you run: ant -diagnostics | grep java.home
这表明位置ant在默认情况下正在寻找java，并证明我的变量没有被拾取.
This showed the location ant was looking for java by default, and proved that my variable wasn't being picked up.
我连接的机器正在运行 bash，所以我不得不将下面的行放入 .bash_profile 中:
The machine I was connected to was running bash, so I had to put the lines below into .bash_profile:
JAVA_HOME=/usr/java/jdk1.6.0_18
export JAVA_HOME
此后，它顺利运行.
希望这对某人有所帮助.
Hope this helps someone.
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