Java Maven 安装 OSX 错误不受支持的major.minor 版本 51.0
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Maven Installation OSX Error Unsupported major.minor version 51.0
提问by Steven
I installed maven by following this steps:(a tutorial)
我按照以下步骤安装了 maven:(教程)
JAVA_HOME=/Library/Java/Home
export M2_HOME=/Users/steven/zimmermann/maven
export M2=$M2_HOME/bin
export PATH=$M2:$PATH
echo $JAVA_HOME
echo $M2_HOME
echo $M2
echo $PATH
nano .bash_profile
then I wrote the echo in the .bash_profile sth like this:
然后我在 .bash_profile 中写了这样的回声：
JAVA_HOME=/usr/libexec/java_home
M2_HOME=/path/to/your/apache-maven-3.x.x
M2=/path/to/your/apache-maven-3.x.x/bin
PATH=/path/to/maven/bin:/$….bla-bla-bla…
and also I wrote this in the .bashrc
我也在 .bashrc 中写了这个
export M2_HOME=/Users/steven/zimmermann/maven
export M2=$M2_HOME/bin
export PATH=$M2:$PATH
now when I want to check the version (mvn -v) I get the following exception:
I think there are some versions wrong, but I don't know.
现在，当我想检查版本 ( mvn -v) 时，出现以下异常：我认为有些版本是错误的，但我不知道。
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/maven/cli/MavenCli : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637)
at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.accessjava -version
0(URLClassLoader.java:58)
at java.net.URLClassLoader.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClassFromSelf(ClassRealm.java:401)
at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:42)
at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:271)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:254)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:239)
at org.codehaus.plexus.classworlds.launcher.Launcher.getMainClass(Launcher.java:144)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:266)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Additional information:
附加信息：
java version "1.8.0_40"
Java(TM) SE Runtime Environment (build 1.8.0_40-b27)
Java HotSpot(TM) 64-Bit Server VM (build 25.40-b25, mixed mode)
java version "1.8.0_40" Java(TM) SE Runtime Environment (build 1.8.0_40-b27) Java HotSpot(TM) 64-Bit Server VM (build 25.40-b25, mixed mode)
javac -version
javac 1.8.0_40
javac 1.8.0_40
$JAVA_HOME/bin/java -version
采纳答案by GerSua
The problem is because you haven't set JAVA_HOME in Mac properly. In order to do that, you should do set it like this:
问题是你没有在 Mac 中正确设置 JAVA_HOME。为了做到这一点，你应该像这样设置它：
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_40.jdk/Contents/Home
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_40.jdk/Contents/Home
In my case my JDK installation is jdk1.8.0_40, make sure you type yours.
就我而言，我的 JDK 安装是 jdk1.8.0_40，请确保键入您的。
Then you can use maven commands.
然后你可以使用maven命令。
Regards!
问候！
回答by René
Please rather try:
请尝试：
export JAVA_HOME=/usr/java/jdk1.7.0_51
Maven uses $JAVA_HOMEfor classpath resolution of JRE libs.
To be sure to use a certain JDK, set it explicitly before compiling, for example:
Maven$JAVA_HOME用于 JRE 库的类路径解析。要确保使用某个JDK，请在编译前显式设置它，例如：
if [[ $(uname) == "Darwin" ]]; then export OSX=1; fi
if [[ $(uname) == "Linux" ]]; then export LINUX=1; fi
if [[ -n $OSX ]]; then
export JAVA_HOME=$(/usr/libexec/java_home)
else
export JAVA_HOME=/usr/lib/jvm/default-java
fi
Isn't there a version < 1.7 and you're using Maven 3.3.1? In this case the reason is a new prerequisite: https://issues.apache.org/jira/browse/MNG-5780
没有版本 < 1.7 并且您使用的是 Maven 3.3.1？在这种情况下，原因是一个新的先决条件：https: //issues.apache.org/jira/browse/MNG-5780
回答by evandrix
A dynamic $HOME/.zshrcsolution, if you're like me ie. Linux @ work; MBP/A @ home
一个动态的$HOME/.zshrc解决方案，如果你像我一样，即。Linux@工作；MBP/A @ 家
brew uninstall maven
brew tap homebrew/versions
brew install maven2
回答by javaboygo
I solved it putting a old version of maven (2.x), using brew:
我使用 brew 解决了它放置旧版本的 maven (2.x)：
##代码##回答by Noumenon
In Eclipse, you don't need to change JAVA_HOME, you just need to change the run configuration for Maven to something above 1.6 (even if your project is on Java 6, Maven shouldn't be). Right-click the project, choose Maven Build or Run As > Run Configurations and set the correct JDK version.
在 Eclipse 中，您不需要更改 JAVA_HOME，您只需要将 Maven 的运行配置更改为 1.6 以上的内容（即使您的项目在 Java 6 上，Maven 也不应该如此）。右键单击项目，选择 Maven Build 或 Run As > Run Configurations 并设置正确的 JDK 版本。
回答by Pradeep
Do this in your .profile -
在您的 .profile 中执行此操作 -
export JAVA_HOME=`/usr/libexec/java_home`
导出 JAVA_HOME=`/usr/libexec/java_home`
(backticks make sure to execute the command and place its value in JAVA_HOME)
（反引号确保执行命令并将其值放在 JAVA_HOME 中）
