Hibernate出现Unsupported major.minor version 51.0错误

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.annotations.Version).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" java.lang.UnsupportedClassVersionError: net/sourceforge/jtds/jdbc/Driver : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at org.hibernate.connection.DriverManagerConnectionProvider.configure(DriverManagerConnectionProvider.java:80)
at org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:137)
at org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:79)
at org.hibernate.cfg.SettingsFactory.createConnectionProvider(SettingsFactory.java:425)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:89)
at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2119)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2115)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1339)
at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)
at com.gaojin.common.Dao.<init>(Dao.java:19)

at com.gaojin.webservice.windowsMobile.MobileImpl.main(MobileImpl.java:19)

如下图：

解决方法：

将引人的包 jtds-1.3.1.jar
换为
jtds-1.2.jar

最后

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