Dubbo FactoryBean threw exception on object creation； nested exception is java.lang.UnsupportedOpera

最新推荐文章于 2023-01-30 14:29:34 发布

luyee2010

最新推荐文章于 2023-01-30 14:29:34 发布

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博客内容涉及Dubbo框架中RouterChain排序问题，由于在JDK8u20之前的版本，Collections.sort对CopyOnWriteArrayList的排序存在bug。此问题导致在初始化RouterChain时出现异常，影响服务引用。解决方案可能涉及到更新JDK或者调整代码以避免使用Collections.sort直接对CopyOnWriteArrayList进行排序，可以改为使用List自带的sort方法。

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错误如下

Caused by: java.lang.UnsupportedOperationException
	at java.util.concurrent.CopyOnWriteArrayList$COWIterator.set(CopyOnWriteArrayList.java:1185)
	at java.util.Collections.sort(Collections.java:170)
	at org.apache.dubbo.rpc.cluster.RouterChain.sort(RouterChain.java:87)
	at org.apache.dubbo.rpc.cluster.RouterChain.initWithRouters(RouterChain.java:67)
	at org.apache.dubbo.rpc.cluster.RouterChain.<init>(RouterChain.java:57)
	at org.apache.dubbo.rpc.cluster.RouterChain.buildChain(RouterChain.java:46)
	at org.apache.dubbo.registry.integration.RegistryDirectory.buildRouterChain(RegistryDirectory.java:622)
	at org.apache.dubbo.registry.integration.RegistryProtocol.doRefer(RegistryProtocol.java:385)
	at org.apache.dubbo.registry.integration.RegistryProtocol.refer(RegistryProtocol.java:367)
	at org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper.refer(ProtocolFilterWrapper.java:114)
	at org.apache.dubbo.qos.protocol.QosProtocolWrapper.refer(QosProtocolWrapper.java:70)
	at org.apache.dubbo.rpc.protocol.ProtocolListenerWrapper.refer(ProtocolListenerWrapper.java:65)
	at org.apache.dubbo.rpc.Protocol$Adaptive.refer(Protocol$Adaptive.java)
	at org.apache.dubbo.config.ReferenceConfig.createProxy(ReferenceConfig.java:366)
	at org.apache.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:305)

RouterChain.sort使用了Collections.sort(CopyOnWriteArrayList)

这个在jdk8u20之前算是bug

Collections.sort(List l, Comparator) should defer to List.sort(Comparator )