java本地代码运行正常,部署到服务器无法运行,错误如下:

 Caused by: java.lang.UnsupportedClassVersionError: com/teshehui/cms/activity/service/impl/ActivityServiceImpl : Unsupported major.minor version 51.0 (unable to load class com.teshehui.cms.activity.service.impl.ActivityServiceImpl)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2858)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1159)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1647)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
at org.springframework.util.ClassUtils.forName(ClassUtils.java:255)
at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:416)
at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1302)
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1273)
... 59 more

最后发现是编译器版本问题。编译代码的编译器级别是 1.7 ,而服务器运行环境的jdk版本是1.6,无法向上兼容,所以得更改编译器级别。

如何根据编译出来的.class 文件判断版本?

 major  minor Java platform version
45 3 1.0
45 3 1.1
46 0 1.2
47 0 1.3
48 0 1.4
49 0 1.5
50 0 1.6
51 0 1.7

从上可以看出,我使用的编译器版本是1.7

用文本本机器打开.class文件,以二进制方式查看,我们可以看到第八个字节是50,即编译版本已是1.6

  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" alt="" />

参考资料:

  http://blog.csdn.net/zhouyong0/article/details/7402161

  http://wangsong76.iteye.com/blog/264071

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