spring boot + dubbo開發遇到過的異常

1. 異常信息
   NoClassDefFoundErrororg.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1162)

Session 0x35e929e94120196 for server 172.16.0.239/172.16.0.239:2182, unexpected error, closing socket connection and attempting reconnect

NoClassDefFoundError
org/apache/zookeeper/proto/SetWatches
org.apache.zookeeper.ClientCnxn$SendThread in primeConnection at line 926
org.apache.zookeeper.ClientCnxnSocketNIO in doTransport at line 363
org.apache.zookeeper.ClientCnxn$SendThread in run at line 1141

NoClassDefFoundErrororg.jboss.netty.logging.JdkLogger.warn(JdkLogger.java:86)

NoClassDefFoundError
org/jboss/netty/channel/DefaultExceptionEvent
org.jboss.netty.channel.Channels in fireExceptionCaught at line 432
org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss in connect at line 390
org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss in processSelectedKeys at line 354
org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss in run at line 276
java.util.concurrent.ThreadPoolExecutor in runWorker at line 1142
java.util.concurrent.ThreadPoolExecutor$Worker in run at line 617
java.lang.Thread in run at line 748

Caused by: java.lang.ClassNotFoundException: ch.qos.logback.classic.spi.ThrowableProxy
    at java.net 

.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:94)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

1. 緣由分析
   

如今感受這些異常的產生都跟dubbo相關線程沒有獲得很好的關閉致使的。

1. 解決方案

啓動時增長系統屬性參數：-Ddubbo.shutdown.hook=true
好比這樣：
java -Ddubbo.shutdown.hook=true -jar pms-wx-1.0.0-SNAPSHOT.jar --spring.profiles.active=qc --spring.dubbo.registry.group=dubbo-test

參考資料

• zookeeper 大量鏈接斷開重連緣由排查
• 精通Dubbo——Dubbo使用指南
• dubbo如何正確關閉Spring容器
• Runtime.getRuntime().addShutdownHook