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Posted to notifications@dubbo.apache.org by "yzlxlf (via GitHub)" <gi...@apache.org> on 2023/03/24 07:24:08 UTC
[GitHub] [dubbo] yzlxlf opened a new issue, #11912: dubbo ClassCastException
yzlxlf opened a new issue, #11912:
URL: https://github.com/apache/dubbo/issues/11912
jdk: 1.8.0_202-b08
vm: k8s
dubbo version: 2.7.15
consumer端发起dubbo
示例代码如下：
@DubboReference
private TestFacade testFacade;
public void test(XxxTestReq req) {
Response<XxxTestResp> resp = testFacade.test(req);
}
其中Response的定义：
public class Response<T> implements Serializable {
private static final long serialVersionUID = 1L;
public T data;
}
在获取resp.getData()的时候，发现，其运行时的对象不是XxxTestResp，二十一个HashMap，同时，我们检查了
XxxTestResp对象，其实现了Serializable 并且显示指定了serialVersionUID，dubbo的consumer和provider对应的serialVersionUID也都是一样的
出现问题的代码是在开发环境，但是相同的代码在测试环境运行，就不会出现ClassCastException，并且运行正常
，dubbo的请求和环境有关吗？
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Re: [I] dubbo ClassCastException [dubbo]
Posted by "wxbty (via GitHub)" <gi...@apache.org>.
wxbty commented on issue #11912:
URL: https://github.com/apache/dubbo/issues/11912#issuecomment-2027015766
please upgrade to the latest version. If you still have problems, please reopen the issue
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[GitHub] [dubbo] steveraman117 commented on issue #11912: dubbo ClassCastException
Posted by "steveraman117 (via GitHub)" <gi...@apache.org>.
steveraman117 commented on issue #11912:
URL: https://github.com/apache/dubbo/issues/11912#issuecomment-1732865954
> > 遇到类似问题，也是2.7.15版本，且同一个docker镜像，重启后自己又好了，正式环境偶发，测试环境从未出现过，本地无法复现 `java.lang.ClassCastException: java.util.HashMap cannot be cast to XXX`
>
> 找一下 std 输出流，hessian 应该有报错输出
在std中找到日志了，最后排查原因是：在某些java8版本下，在CompletableFuture中getClassLoader()会得到null。
由于hessian只在首次初始化时保存loader，结果是个null。
所以出现概率性发生异常，重启后会好的情况：因为和首次进行dubbo调用的线程有关。
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Re: [I] dubbo ClassCastException [dubbo]
Posted by "wxbty (via GitHub)" <gi...@apache.org>.
wxbty closed issue #11912: dubbo ClassCastException
URL: https://github.com/apache/dubbo/issues/11912
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[GitHub] [dubbo] AlbumenJ commented on issue #11912: dubbo ClassCastException
Posted by "AlbumenJ (via GitHub)" <gi...@apache.org>.
AlbumenJ commented on issue #11912:
URL: https://github.com/apache/dubbo/issues/11912#issuecomment-1484978687
可能是开发环境有其他的机器发布了有问题的服务，然后调用到了
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[GitHub] [dubbo] AlbumenJ commented on issue #11912: dubbo ClassCastException
Posted by "AlbumenJ (via GitHub)" <gi...@apache.org>.
AlbumenJ commented on issue #11912:
URL: https://github.com/apache/dubbo/issues/11912#issuecomment-1705874638
> 遇到类似问题，也是2.7.15版本，且同一个docker镜像，重启后自己又好了，正式环境偶发，测试环境从未出现过，本地无法复现 `java.lang.ClassCastException: java.util.HashMap cannot be cast to XXX`
找一下 std 输出流，hessian 应该有报错输出
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[GitHub] [dubbo] steveraman117 commented on issue #11912: dubbo ClassCastException
Posted by "steveraman117 (via GitHub)" <gi...@apache.org>.
steveraman117 commented on issue #11912:
URL: https://github.com/apache/dubbo/issues/11912#issuecomment-1697481794
遇到类似问题，也是2.7.15版本，且同一个docker镜像，重启后自己又好了，正式环境偶发，测试环境从未出现过，本地无法复现
`java.lang.ClassCastException: java.util.HashMap cannot be cast to XXX`
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[GitHub] [dubbo] AlbumenJ commented on issue #11912: dubbo ClassCastException
Posted by "AlbumenJ (via GitHub)" <gi...@apache.org>.
AlbumenJ commented on issue #11912:
URL: https://github.com/apache/dubbo/issues/11912#issuecomment-1735457306
> > > 遇到类似问题，也是2.7.15版本，且同一个docker镜像，重启后自己又好了，正式环境偶发，测试环境从未出现过，本地无法复现 `java.lang.ClassCastException: java.util.HashMap cannot be cast to XXX`
> >
> >
> > 找一下 std 输出流，hessian 应该有报错输出
>
> 在std中找到日志了，最后排查原因是：在某些java8版本下，在CompletableFuture中getClassLoader()会得到null。 由于hessian的ClassFactory只在首次初始化时保存loader，结果是个null，后续就一种用null加载类。 所以出现概率性发生异常，重启后会好的情况：因为和首次进行dubbo调用的线程有关。
可以升级下 3.x 版本，高版本对于多 classloader 的支持会完善很多
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