org/apache/maven/cli/MavenCli : Unsupported major.minor version 51.0
2016-09-22 19:24
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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:631) at java.lang.ClassLoader.defineClass(ClassLoader.java:615) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) at java.net.URLClassLoader.access$000(URLClassLoader.java:58) at java.net.URLClassLoader$1.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)
顺藤摸瓜,查看Eclipse 使用的 maven版本 (Window - Preferences - Maven - Installations)
发现用的是内置版本3.3.9
查看官网 http://maven.apache.org/download.cgi
发现这个版本最低要求JDK 1.7
继续查看自己的项目使用的jre版本是1.5
调 查 结 果
构建此项目时,用的是1.5 ,而运行maven 3.3.9 需要至少1.7
尝试调整项目为1.6
依旧是这个错误
直到——
调整为1.7 ,构建成功 ,确认为就是此问题。
[INFO] BUILD SUCCESS
解 决 方 案
第一种:
将项目JRE 版本升至1.7及以上(可以通过Maven Compiler插件)
第二种:
降低Maven版本至3.2 (不用内置版,使用外部版本,如下图)
补充
javap.exe
javap -v 可以输出 class文件的 minor version 和 major version 信息
简单示例:
新建 Test.java
class Test{}
分别用 jdk1.6 ,jdk1.7 , jdk1.8 编译和分解
E:\>D:\e\java\jdk1.6.0_45\bin\javac.exe Test.java E:\>javap.exe -v Test.class ... class Test minor version: 0 major version: 50 flags: ACC_SUPER ... E:\>D:\e\java\jdk1.7.0_79\bin\javac.exe Test.java E:\>javap -v Test.class ... class Test minor version: 0 major version: 51 flags: ACC_SUPER ... E:\>D:\e\java\jdk1.8.0_131\bin\javac.exe Test.java E:\>javap -v Test.class ... class Test minor version: 0 major version: 52 flags: ACC_SUPER ...
回过头来看之前的错误
org/apache/maven/cli/MavenCli : Unsupported major.minor version 51.0
当时使用的maven 版本是Eclipse 内置版 3.3.9
从官网下载将其下载,找到
下的
,找出一个class文件使用javap 查看version信息,如下:
至此可知这句异常信息的含义:当前的class 文件需要至少jdk 1.7 以上(51,52),而你的当前的jdk不支持我的class
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