Question

我想我混淆了一些东西。昨天事情进展顺利。今天遇到很多问题..

1.我跑了这个命令

echo $JAVA_HOME
/usr/lib/jvm/java-7-openjdk-amd64/

然后

mvn --version
Error: Could not find or load main class    org.codehaus.plexus.classworlds.launcher.Launcher

昨天它工作正常（返回maven版本，3.0.4，我认为）。现在这已经开始产生问题了。该怎么办？

运行后

$ java --version 无法识别的选项： - version 无法创建Java虚拟机。

这是我的.bashrc文件的内容，我的/ etc / environment文件中没有任何内容。

PATH=$PATH:$HOME/.rvm/
JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64/
export JAVA_HOME
PATH=$PATH:$JAVA_HOME
export PATH

这是在我的/ etc / profile

JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64/
PATH=$PATH:$HOME:$JAVA_HOME/bin
export JAVA_HOME
export PATH

另请告诉我，如何在其中设置MAVEN_HOME ..

任何帮助将不胜感激。谢谢:)）

Answer 1

也许我的配置会给你一个提示：

/$ uname -a
Linux jenkins 3.2.0-55-generic #85-Ubuntu SMP Wed Oct 2 12:29:27 UTC 2013 \
  x86_64 x86_64 x86_64 GNU/Linux

/$ echo $PATH
/var/lib/jenkins/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin

/$ ls -l /usr/bin/java* / usr/bin/mvn*
lrwxrwxrwx 1 root root 22 Feb 21  2013 java -> /etc/alternatives/java
lrwxrwxrwx 1 root root 23 Feb 21  2013 javac -> /etc/alternatives/javac
lrwxrwxrwx 1 root root 24 Feb 21  2013 javaws -> /etc/alternatives/javaws
lrwxrwxrwx 1 root root 21 Feb 21  2013 mvn -> /etc/alternatives/mvn
lrwxrwxrwx 1 root root 26 Feb 21  2013 mvnDebug -> /etc/alternatives/mvnDebug

/$ ls -l /etc/alternatives/java* /etc/alternatives/mvn*
lrwxrwxrwx 1 root root 17 May 31  2013 /etc/alternatives/java -> \
  /opt/jdk/bin/java
lrwxrwxrwx 1 root root 18 May 31  2013 /etc/alternatives/javac -> \
  /opt/jdk/bin/javac
lrwxrwxrwx 1 root root 58 Feb 21  2013 /etc/alternatives/javaws.1.gz -> \
  /usr/lib/jvm/java-6-openjdk-amd64/jre/man/man1/javaws.1.gz
lrwxrwxrwx 1 root root 24 Feb 21  2013 /etc/alternatives/mvn -> \
  /usr/share/maven/bin/mvn
lrwxrwxrwx 1 root root 29 Feb 21  2013 /etc/alternatives/mvn.1.gz -> \
  /usr/share/maven/man/mvn.1.gz
lrwxrwxrwx 1 root root 29 Feb 21  2013 /etc/alternatives/mvnDebug -> \
  /usr/share/maven/bin/mvnDebug
lrwxrwxrwx 1 root root 34 Feb 21  2013 /etc/alternatives/mvnDebug.1.gz -> \
  /usr/share/maven/man/mvnDebug.1.gz

/usr/share/maven/conf/m2.conf：

main is org.apache.maven.cli.MavenCli from plexus.core

set maven.home default ${user.home}/m2

[plexus.core]
optionally ${maven.home}/lib/ext/*.jar
load       ${maven.home}/lib/*.jar

/$ java -version
java version "1.7.0_21"
Java(TM) SE Runtime Environment (build 1.7.0_21-b11)
Java HotSpot(TM) 64-Bit Server VM (build 23.21-b01, mixed mode)

/$ mvn -version
Apache Maven 3.0.4
Maven home: /usr/share/maven
Java version: 1.7.0_21, vendor: Oracle Corporation
Java home: /opt/jdk1.7.0_21/jre
Default locale: en_GB, platform encoding: UTF-8
OS name: "linux", version: "3.2.0-55-generic", arch: "amd64", family: "unix"

Answer 2

只有一个错误是java --version。应该是java -version（单破折号）否则它现在工作正常......

Answer 3

http://www.johnlabarge.com/post/33156663109/dreaded-maven-error-could-not-find-or-load-main-class此链接可以提供帮助，只需删除M2_HOME变量，然后添加M3_HOME变量。

顺便说一句，要打印Java版本号，你应该输入java -version，而不是java --version，只需要一个破折号，但是对于Maven，两者都是＆＃39; mvn -version＆＃39;并且mvn --version没问题。

找到maven版本＆amp;在ubuntu中设置MAVEN_HOME

3 个答案: