java exception：部分类出现UnsupportedClassVersionError

采取linq4j时，发现有些环境编译报错了。如下：

严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userSubAccountController': Injection of resource dependencies failed; nested exception is java.lang.UnsupportedClassVersionError: org/apache/calcite/linq4j/function/Predicate1 : Unsupported major.minor version 51.0 (unable to load class org.apache.calcite.linq4j.function.Predicate1)
    at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:306)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1146)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)

原因：1. jar包版本和jdk版本冲突等，jdk环境和tomcat版本；2.linq4j的支持版本等。

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参考：http://mark-5528.iteye.com/blog/2161827