环境:MyEclipse2015+ActiveMQ5.11.1使用不同版本的JDK,执行Java application时会出现不同的表现。1、JDK版本为jdk1.5/J2SE-1.5错误: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版本为:JavaSE-1.6错误: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无错误。4、JDK版本Jdk-1.4session = connection.createSession(Boolean.FALSE, Session.AUTO_ACKNOWLEDGE);在方法createSession中出现错误:The method createSession(boolean, int) in the type Connection is not applicable for the arguments (Boolean, int)最终结论:ActiveMQ5.11.1必须在JDK1.7以上版本才能使用。推荐阅读:Linux系统下ActiveMQ 安装 http://www.linuxidc.com/Linux/2012-03/55623.htmUbuntu下的ACTIVEMQ服务器 http://www.linuxidc.com/Linux/2008-07/14587.htmSpring+JMS+ActiveMQ+Tomcat实现消息服务 http://www.linuxidc.com/Linux/2011-10/44632.htmLinux环境下面ActiveMQ端口号设置和WEB端口号设置 http://www.linuxidc.com/Linux/2012-01/51100.htm本文永久更新链接地址