@elmar-chen @diecui1202 感谢回答，`private List<Byte> levels`是有的，应该是我粘贴问题时弄丢了。
案例我再贴一次吧
`@Data
public class SimpleDTO implements Serializable {
private static final long serialVersionUID = 3491623810140922257L;
private Long id;
private List<Byte> levels;
}`
`public interface SimpleProvider {
boolean cxtest(SimpleDTO dto);
}`
`@Component
public class SimpleProviderImpl implements SimpleProvider {
@Override
public boolean cxtest(SimpleDTO dto) {
Long id=dto.getId();
List<Byte> leves=dto.getLevels();
leves.stream().forEach(l-> System.out.println(l));
return true;
}
}
`
消费方（与服务不在同一个应用，消费方和服务都为<dubbo:protocol name="dubbo"）：
` SimpleDTO d=new SimpleDTO();
d.setId(23L);
d.setLevels(Arrays.asList((byte)-1,(byte)2));
boolean res= simpleProvider.cxtest(d);
System.out.println(res);`
异常信息：
java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Byte
at
java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1380)
~[?:1.8.0_151]
at
java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580)
~[?:1.8.0_151]
at
com.cx.provider.SimpleProviderImpl.cxtest(SimpleProviderImpl.java:15)
~[classes/:?]
at
com.alibaba.dubbo.common.bytecode.Wrapper9.invokeMethod(Wrapper9.java)
~[?:2.5.3]
at
com.alibaba.dubbo.rpc.proxy.javassist.JavassistProxyFactory$1.doInvoke(JavassistProxyFactory.java:46)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.rpc.proxy.AbstractProxyInvoker.invoke(AbstractProxyInvoker.java:72)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper.java:53)
~[dubbo-2.5.3.jar:2.5.3]
at com.cx.dubbo.filter.ResponseFilter.invoke(ResponseFilter.java:69)
~[cx-client-1.4.0-20180802.074711-8.jar:?]
at
com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
~[dubbo-2.5.3.jar:2.5.3]
at
com.cx.dubbo.filter.AsyncTransmitFilter.invoke(AsyncTransmitFilter.java:25)
~[cx-client-1.4.0-20180802.074711-8.jar:?]
at
com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:65)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.rpc.filter.AccessLogFilter.invoke(AccessLogFilter.java:199)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.rpc.protocol.dubbo.filter.TraceFilter.invoke(TraceFilter.java:78)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.rpc.filter.ContextFilter.invoke(ContextFilter.java:60)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.rpc.filter.GenericFilter.invoke(GenericFilter.java:112)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.rpc.filter.ClassLoaderFilter.invoke(ClassLoaderFilter.java:38)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
~[dubbo-2.5.3.jar:2.5.3]
at com.alibaba.dubbo.rpc.filter.EchoFilter.invoke(EchoFilter.java:38)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.rpc.protocol.dubbo.DubboProtocol$1.reply(DubboProtocol.java:108)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.handleRequest(HeaderExchangeHandler.java:84)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.received(HeaderExchangeHandler.java:170)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.remoting.transport.DecodeHandler.received(DecodeHandler.java:52)
~[dubbo-2.5.3.jar:2.5.3]
at
com.alibaba.dubbo.remoting.transport.dispatcher.ChannelEventRunnable.run(ChannelEventRunnable.java:82)
~[dubbo-2.5.3.jar:2.5.3]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[?:1.8.0_151]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[?:1.8.0_151]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_151]
[ Full content available at:
https://github.com/apache/incubator-dubbo/issues/2493 ]
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