用dubbo时遇到的一个序列化的坑
首先,这是标题党,问题并不是出现在序列化上,这是报错的一部分:
Caused by: com.alibaba.dubbo.remoting.RemotingException: Failed to send response: Response [id=24, version=2.0.0, status=20, event=false, error=null, result=RpcResult [result=xxxService$7@57e8ec64, exception=null]], cause: java.lang.RuntimeException: Serialized class xxxService must implement java.io.Serializable
Java field: final xxxService xxxService$7.this$0
java.lang.RuntimeException: Serialized class xxxService must implement java.io.Serializable
Java field: final xxxService xxxService$7.this$0
at com.alibaba.com.caucho.hessian.io.JavaSerializer$FieldSerializer.serialize(JavaSerializer.java:315)
at com.alibaba.com.caucho.hessian.io.JavaSerializer.writeInstance(JavaSerializer.java:263)
at com.alibaba.com.caucho.hessian.io.JavaSerializer.writeObject(JavaSerializer.java:227)
at com.alibaba.com.caucho.hessian.io.Hessian2Output.writeObject(Hessian2Output.java:408)
at com.alibaba.dubbo.common.serialize.support.hessian.Hessian2ObjectOutput.writeObject(Hessian2ObjectOutput.java:92)
at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCodec.encodeResponseData(DubboCodec.java:210)
报了错的是注册给dubbo的service端,代码类似这样(https://github.com/saaavsaaa/warn-report/blob/master/src/test/java/TestObjectInstance.java):
class SService{ public A getA(){ A a = new A(){{setN("dto");}}; return a; } } class A{ protected String n; public A(){ n = "a"; } public String getN() { return n; } public void setN(String n) { this.n = n; } }
@Test public void testSerializ(){ SService s = new SService(); A a = s.getA(); System.out.println(a.getN()); }
这什么情况,虽然通过dubbo的网络传输是需要序列化的,但是你要我把sevice也实现Serializable是闹哪样,然后紧接着发现了个更奇怪的事:第二行Java field: final xxxService xxxService$7.this$0,哪来的field,哪也没定义过这玩意,怎么还有个this...,当然上面的精简代码是能一眼猜到问题在哪,不过原本的代码好几百行,查的这个费劲,其实看到这个精简代码大家也基本可以猜到问题在哪了:
A a = new A(){{setN("dto");}};
代码改成:
class SService{ public A getA(){ // A a = new A(){{setN("dto");}}; A a = new A(); a.setN("dto"); return a; } }
结果就正常了:
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