https://issues.apache.org/bugzilla/show_bug.cgi?id=56387

--- Comment #2 from qiubo...@qq.com ---
yes,thread b could see non-updated value started=true,my typo.

we found this excepiton:

java.lang.NoClassDefFoundError: org/jboss/netty/util/internal/ExecutorUtil
        at
org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory.releaseExternalResources(NioServerSocketChannelFactory.java:146)
~[netty-3.2.5.Final.jar:na]
        at
org.jboss.netty.bootstrap.Bootstrap.releaseExternalResources(Bootstrap.java:324)
~[netty-3.2.5.Final.jar:na]
        at
com.alibaba.dubbo.remoting.transport.netty.NettyServer.doClose(NettyServer.java:124)
~[dubbo-2.5.3.jar:2.5.3]
        at
com.alibaba.dubbo.remoting.transport.AbstractServer.close(AbstractServer.java:155)
[dubbo-2.5.3.jar:2.5.3]
        at
com.alibaba.dubbo.remoting.transport.AbstractServer.close(AbstractServer.java:163)
[dubbo-2.5.3.jar:2.5.3]
        at
com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeServer.close(HeaderExchangeServer.java:121)
[dubbo-2.5.3.jar:2.5.3]
        at
com.alibaba.dubbo.rpc.protocol.dubbo.DubboProtocol.destroy(DubboProtocol.java:395)
[dubbo-2.5.3.jar:2.5.3]
        at
com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper.destroy(ProtocolFilterWrapper.java:66)
[dubbo-2.5.3.jar:2.5.3]
        at
com.alibaba.dubbo.rpc.protocol.ProtocolListenerWrapper.destroy(ProtocolListenerWrapper.java:72)
[dubbo-2.5.3.jar:2.5.3]
        at
com.alibaba.dubbo.config.ProtocolConfig.destroyAll(ProtocolConfig.java:435)
[dubbo-2.5.3.jar:2.5.3]
        at
com.alibaba.dubbo.config.AbstractConfig$1.run(AbstractConfig.java:452)
[dubbo-2.5.3.jar:2.5.3]
        at java.lang.Thread.run(Thread.java:722) [na:1.7.0_03]
Caused by: java.lang.ClassNotFoundException:
org.jboss.netty.util.internal.ExecutorUtil
        at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1711)
~[na:na]
        at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1556)
~[na:na]
        ... 12 common frames omitted

the thread b is a java shunt down hook.so,it haven't been stopped .

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