java 运行环境版本和编译版本不匹配

abloz 2015-06-01
abloz 2015-06-01

周海汉2015.6.1 儿童节快乐!

Caused by: java.lang.UnsupportedClassVersionError: com/xxx/Global : Unsupported major.minor version 52.0

根据 Java VM Spec, “A Java virtual machine implementation can support a class file format of version v if and only if v lies in some contiguous range Mi.0 v Mj.m. Only Sun can specify what range of versions a Java virtual machine implementation conforming to a certain release level of the Java platform may support.”

Java 的主版本号是: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.

 “major.minor version 52.0” 就是jdk 1.8,当前环境不支持。即采用了J2SE 8来编译的类,其class文件的主版本major_version是52,最小版本minor_version是0.

如何解决 UnsupportedClassVersionError? 

检查是否使用了较老的jdk来运行新版jdk编译的java程序。一般新版的jdk对老版的保持兼容,除非是版本相差太多。

因为我出错的原因是为了测试,将zshrc中的原jdk 1.8改成1.6了,所以报错。

zhh@~ % java -version

java version “1.6.0_65”

Java(TM) SE Runtime Environment (build 1.6.0_65-b14-466.1-11M4716)

Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-466.1, mixed mode)

在.zshrc或.bashrc,.bash_profile中改回来。

#export JAVA_HOME=/usr/libexec/java_home -v 1.6

export JAVA_HOME=/usr/libexec/java_home

zhh@~ % java -version

java version “1.8.0_45”

Java(TM) SE Runtime Environment (build 1.8.0_45-b14)

Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)

此时不再报上述错误,程序运行正常。

参考:

http://geekexplains.blogspot.com/2009_01_01_archive.html

http://ljhzzyx.blog.163.com/blog/static/383803122013719115332807/


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