Invalid use of BasicClientConnManager: connection still allocated

[Python-IBM]

• I have searched the issues of this repository and believe that this is not a duplicate.
• I have checked the FAQ of this repository and believe that this is not a duplicate.

Environment

• Dubbo version: 2.6.5
• Operating System version: Red Hat 4.8.5-11
• Java version:1.8.0

Steps to reproduce this issue

1. consumer use http protocol
2. submit a POST request

Pls. provide [GitHub address] to reproduce this issue.

Expected Result

response data

Actual Result

report errors

java.util.concurrent.ExecutionException: java.lang.IllegalStateException: Invalid use of BasicClientConnManager: connection still allocated.
Make sure to release the connection before allocating another one.
	at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0]
	at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0]
	at 

[CrazyHZM]

I see your error message, it seems that you use the hessian protocol, what do you think?

com.alibaba.dubbo.rpc.protocol.hessian.HttpClientConnection.sendRequest(HttpClientConnection.java:64) ~[dubbo-2.6.5.jar!/:2.6.5] at com.caucho.hessian.client.HessianProxy.sendRequest(HessianProxy.java:296) ~[hessian-4.0.37.jar!/:3.1.0]

if you use the hessian protoco and dubbo version is 2.6.5
httpclient is created in this way. When a concurrent request is made, the exception is thrown because the previous httpclient is not released.
'HttpClient httpClient = new DefaultHttpClient()'

In the latest version, httpclient is created this way.
httpClient = HttpClientBuilder.create().setDefaultRequestConfig(requestConfig).build();
build()this method uses the PoolingHttpClientConnectionManager, so it won't cause this exception to be thrown.

[CrazyHZM]

@ralf0131
If I am correct, do we have to modify 2.6.x simultaneously?

[Python-IBM]

@ralf0131
If I am correct, do we have to modify 2.6.x simultaneously?

Yes，please modify 2.6.x simultaneously.

[ralf0131]

@CrazyHZM Would you help to fix it in 2.6.x?

[CrazyHZM]

@CrazyHZM Would you help to fix it in 2.6.x?
I will fix it later.

[Python-IBM]

@CrazyHZM Would you help to fix it in 2.6.x?
I will fix it later.

Thanks,I will re-download the v2.6.5 when you fix it.

[Python-IBM]

I downloaded the 2.6.5 version of the jar package again. Why do I see that the source code hasn't changed?

[CrazyHZM]

@ralf0131 Please review that pr.

[ralf0131]

The pull request has been merged, it will be fixed from 2.6.7 onwards.
You can try the 2.6.x branch.