dubbo启动失败 Could not load com.alibaba.dubbo.common.utils.NetUtils

INFO: Illegal access: this web application instance has been stopped already.  Could not load com.alibaba.dubbo.common.utils.NetUtils.  The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1588)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547)
        at com.alibaba.dubbo.common.logger.support.FailsafeLogger.appendContextMessage(FailsafeLogger.java:39)
        at com.alibaba.dubbo.common.logger.support.FailsafeLogger.warn(FailsafeLogger.java:107)
        at com.alibaba.dubbo.config.ReferenceConfig$1.finalize(ReferenceConfig.java:106)
        at java.lang.System$2.invokeFinalize(System.java:1270)
        at java.lang.ref.Finalizer.runFinalizer(Finalizer.java:98)
        at java.lang.ref.Finalizer.access$100(Finalizer.java:34)
        at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:210)

dubbo-admin版本为2.5.4,
之前jdk版本为1.7，后更换为1.8，考虑是jdk版本升级导致问题,

升级dubbo-admin版本，成功

参考：http://blog.csdn.net/blue_dd/article/details/51298438

http://www.itmayun.com/it/files/226631678709806/resource/901920001882583/1.html