编译异常 Caused by: java.lang.UnsupportedClassVersionError:

Caused by: java.lang.UnsupportedClassVersionError: com/sumingk/platform/service/impl/ServiceSysPersonImpl : Unsupported major.minor version 51.0 (unable to load class com.sumingk.platform.service.impl.ServiceSysPersonImpl)
    at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2892)
    at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1172)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1558)
    at org.springframework.util.ClassUtils.forName(ClassUtils.java:249)
    at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:395)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1349)
    at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1320)
    ... 24 more

解决方案:

 造成这种错误原因是的支撑Tomcat运行的JDK版本与支撑application运行的JDK版本不一致导致的.
 把它们的JDK本改成一致步骤如下:
    1.Window --> Preferences -->Java --> compiler中的compiler compliance level对应的下拉菜单中选择JDK版本.

    2.Window --> Preferences -->MyEclipse --> Servers -->Tomcat --> Tomcat n.x -->JDK中的Tomcat JDK name下的下拉菜单中选择自身电脑上安装的JDK版本(必需与步骤1中的JDK版本一致).

 要编译项目要确保:三点jdk必须一致

   1.Window --> Preferences -->Java --> compiler

   2.Window --> Preferences -->MyEclipse --> Servers -->Tomcat --> Tomcat n.x -->JDK

   3.项目右键---->properties---->Java Build Path --->jdk 版本