報錯代碼：
nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [base/conf/spring/spring-base-activemq.xml]; nested exception is java.lang.UnsupportedClassVersionError: org/apache/activemq/spring/ActiveMQConnectionFactory : Unsupported major.minor version 51.0 (unable to load class org.apache.activemq.spring.ActiveMQConnectionFactory)等一大堆，總之意思就是Unsupported major.minor version 51.0出錯
環境：Eclipse mars +ActiveMQ5.11.1
使用不同版本的JDK，執行Java application時會出現不同的表現。
1、JDK版本爲jdk1.5/J2SE-1.5
錯誤：
java.lang.UnsupportedClassVersionError: Bad version number in .class file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
Exception in thread "main"
2、JDK版本爲：JavaSE-1.6
錯誤：
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/activemq/ActiveMQConnectionFactory : 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$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at org.com.activemq1.Receiver.main(Receiver.java:25)
3、JDK版本：JavaSE-1.7
無錯誤。
4、JDK版本Jdk-1.4
session = connection.createSession(Boolean.FALSE,
Session.AUTO_ACKNOWLEDGE);
在方法createSession中出現錯誤：
The method createSession(boolean, int) in the type Connection is not applicable for the arguments (Boolean, int)
最終結論：ActiveMQ5.11.1必須在JDK1.7以上版本才能使用。
參考以上答案，將原來配置的jdk1.6版本，更換爲jdk1.7版本後，項目完美啓動
文章借鑑出處：https://www.linuxidc.com/Linux/2015-05/118124.htm，對作者表示感謝