Maven -- maven 安装错误：线程“main”中的异常 java.lang.UnsupportedClassVersionError
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/30508892/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Maven -- maven installation error: Exception in thread "main" java.lang.UnsupportedClassVersionError
提问by asamolion
I've been trying to install and configure maven-3.3.3 for the past hour. When I type:
过去一个小时我一直在尝试安装和配置 maven-3.3.3。当我输入：
mvn --version
I get this error in cmd
我在 cmd 中收到此错误
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/ma
ven/cli/MavenCli : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:14
1)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.accessJAVA_HOME = C:\Program Files\Java\jdk1.6.0_45
M2_HOME = C:\Program Files\Apache Software Foundation\apache-maven-3.3.3
MAVEN_OPTS = -Xms256m -Xmx512m
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(Cl
assRealm.java:401)
at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(
SelfFirstStrategy.java:42)
at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadCl
ass(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(Launch
er.java:144)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Laun
cher.java:266)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.jav
a:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(La
uncher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:
356)
I've followed the official guide and also looked at several other blogs and forums.
我遵循了官方指南，并查看了其他几个博客和论坛。
Here are my system variables
这是我的系统变量
%M2_HOME%\bin;%JAVA_HOME%\bin
And I've added the following lines at the end of Path variable
我在 Path 变量的末尾添加了以下几行
java -version
Someone please tell me why I am getting this error. Thanks in advance.
有人请告诉我为什么我会收到此错误。提前致谢。
P.S
聚苯乙烯
java version "1.6.0_45"
Java(TM) SE Runtime Environment (build 1.6.0_45-b06)
Java HotSpot(TM) Client VM (build 20.45-b01, mixed mode, sharing)
gives
给
J2SE 8 - 52
J2SE 7 - 51
J2SE 6.0 - 50
J2SE 5.0 - 49
JDK 1.4 - 48
JDK 1.3 - 47
JDK 1.2 - 46
JDK 1.1 - 45
采纳答案by meskobalazs
You need to update to Java 7, as the class version 51.0means, that it was built for Java 7. By the way, these are the valid versions:
您需要更新到 Java 7，因为类版本51.0意味着它是为 Java 7 构建的。顺便说一下，这些是有效版本：
