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今天装好了了Maven3.3.3后,死活运行不了
CvdeMacBook-Pro:~ chenwei$ mvn Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/maven/cli/MavenCli : Unsupported major.minor version 51.0
这个错误明显是运行的jdk版本低于编译的jdk版本,但是本地的jdk已经装成1.8了,maven3.3.3只需要1.7而已
CvdeMacBook-Pro:~ chenwei$ java -version java version "1.8.0_51" Java(TM) SE Runtime Environment (build 1.8.0_51-b16) Java HotSpot(TM) 64-Bit Server VM (build 25.51-b03, mixed mode)
配置了JAVA_HOME依然没用(`/usr/libexec/java_home`意思是执行``中的内容替换,/usr/libexec/java_home是mac推荐的设置方式)
CvdeMacBook-Pro:apache-maven-3.3.3 chenwei$ cat ~/.bash_profile # Setting PATH for Python 3.4 # The orginal version is saved in .bash_profile.pysave M3_HOME="/Users/chenwei/Developers/Maven/apache-maven-3.3.3" JAVA_HOME="`/usr/libexec/java_home`" PATH="/Library/Frameworks/Python.framework/Versions/3.4/bin:${PATH}" PATH="$JAVA_HOME/bin:$M3_HOME/bin:$PATH" export PATH
然后我查看mvn里面找JAVA_HOME的方式
bash-3.2$ vi `which mvn`
在里面找到加载方式
# # Look for the Apple JDKs first to preserve the existing behaviour, and then look # for the new JDKs provided by Oracle. # if [ -z "$JAVA_HOME" ] && [ -L /System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK ] ; then # # Apple JDKs # export JAVA_HOME=/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK/Home fi if [ -z "$JAVA_HOME" ] && [ -L /System/Library/Java/JavaVirtualMachines/CurrentJDK ] ; then # # Apple JDKs # export JAVA_HOME=/System/Library/Java/JavaVirtualMachines/CurrentJDK/Contents/Home fi if [ -z "$JAVA_HOME" ] && [ -L "/Library/Java/JavaVirtualMachines/CurrentJDK" ] ; then # # Oracle JDKs # export JAVA_HOME=/Library/Java/JavaVirtualMachines/CurrentJDK/Contents/Home fi if [ -z "$JAVA_HOME" ] && [ -x "/usr/libexec/java_home" ]; then # # Apple JDKs # export JAVA_HOME=`/usr/libexec/java_home` fi
我想我已经配置过JAVA_HOME了不可能有问题啊
调试看看
bash-3.2$ sh -x mvn + ‘[‘ -z ‘‘ ‘]‘ + ‘[‘ -f /etc/mavenrc ‘]‘ + ‘[‘ -f /Users/chenwei/.mavenrc ‘]‘ + cygwin=false + darwin=false + mingw=false + case "`uname`" in ++ uname + darwin=true + ‘[‘ -z ‘‘ ‘]‘ + ‘[‘ -L /System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK ‘]‘ + export JAVA_HOME=/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK/Home + JAVA_HOME=/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK/Home
这里发现没有找到JAVA_HOME,于是设置成jdk1.6了
由于我坚信我设置了~/.bash.profile 的JAVA_HOME.
echo $JAVA_HOME是有值的
然后看到mvn开头设置的#!/bin/sh,怀疑是sh找不到JAVA_HOME
试了一下
bash-3.2$ sh sh-3.2$ echo $JAVA_HOME sh-3.2$
果然如此,于是开始研究怎么设置sh的环境变量,把/etc/profile中的JAVA_HOME也按.bash_profile的方式设置了一遍
还是没用
然后开始研究shell的环境变量加载,看到erport的作用时,我终于反应过来,我设置了JAVA_HOME,但是没有export,只export了PATH.
于是修改.bash_profile
sh-3.2$ vi ~/.bash_profile # Setting PATH for Python 3.4 # The orginal version is saved in .bash_profile.pysave M3_HOME="/Users/chenwei/Developers/Maven/apache-maven-3.3.3" JAVA_HOME="`/usr/libexec/java_home`" PATH="/Library/Frameworks/Python.framework/Versions/3.4/bin:${PATH}" PATH="$JAVA_HOME/bin:$M3_HOME/bin:$PATH" export JAVA_HOME export M3_HOME export PATH
source一下,然后再运行mvn,终于搞定了
CvdeMacBook-Pro:~ chenwei$ mvn -v Apache Maven 3.3.3 (7994120775791599e205a5524ec3e0dfe41d4a06; 2015-04-22T19:57:37+08:00) Maven home: /Users/chenwei/Developers/Maven/apache-maven-3.3.3 Java version: 1.8.0_51, vendor: Oracle Corporation Java home: /Library/Java/JavaVirtualMachines/jdk1.8.0_51.jdk/Contents/Home/jre Default locale: zh_CN, platform encoding: UTF-8 OS name: "mac os x", version: "10.10.4", arch: "x86_64", family: "mac"
这种低级错误,都是因为不熟悉linux导致的,简直笨得哭出来
记一次在mac上配置Maven 的JAVA_HOME的惨痛经历
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原文地址：http://www.cnblogs.com/cvbaka/p/4678253.html
