Jackzeng1224 commented on pull request #376:
URL: 
https://github.com/apache/incubator-eventmesh/pull/376#issuecomment-887943674


   > @Jackzeng1224 Yes, I can see the log that the message has been sent to 
kafka.
   > You can use `AsyncSyncRequestInstance` to send async requests, and I find 
a bug in `LiteProducer` line 218.
   > 
https://github.com/apache/incubator-eventmesh/blob/737c0f09efeba61a62653d33fd553491af7d0deb/eventmesh-sdk-java/src/main/java/org/apache/eventmesh/client/http/producer/LiteProducer.java#L207-L219
   > 
   > This method should be async, but it sends a sync command, I will fix in 
another pr.
   > And you can modified the line 218 to
   > 
   > ```java
   > requestParam.addHeader(ProtocolKey.REQUEST_CODE, 
String.valueOf(RequestCode.MSG_SEND_ASYNC.getRequestCode()))
   > ```
   > 
   > Then you will see below log in runtime module:
   > 
   > ```
   > 2021-07-27 19:28:37,824 INFO  [kafka-producer-network-thread | producer-1] 
message(SendAsyncMessageProcessor.java:196) - 
message|eventMesh2mq|REQ|ASYNC|send2MQCost=4ms|topic=TEST-TOPIC-TCP-ASYNC|bizSeqNo=920594188447336930612967879404|uniqueId=243186356065686374194669481534
   > ```
   > 
   > But the response in `AsyncSyncRequestInstance` is also failed, I think it 
might be another issue.
   > 
   > ```java
   > 2021-07-27 19:48:40,956 DEBUG [main] 
AsyncSyncRequestInstance(AsyncSyncRequestInstance.java:81) - sendmsg failed
   > org.apache.eventmesh.common.EventMeshException: 
com.alibaba.fastjson.JSONException: syntax error,except start with { or [,but 
actually start with error
   >    at 
org.apache.eventmesh.client.http.producer.RRCallbackResponseHandlerAdapter.handleResponse(RRCallbackResponseHandlerAdapter.java:94)
 ~[eventmesh-sdk-java-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
   >    at 
org.apache.eventmesh.client.http.producer.RRCallbackResponseHandlerAdapter.handleResponse(RRCallbackResponseHandlerAdapter.java:41)
 ~[eventmesh-sdk-java-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
   >    at 
org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:222)
 ~[httpclient-4.5.2.jar:4.5.2]
   >    at 
org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:164)
 ~[httpclient-4.5.2.jar:4.5.2]
   >    at 
org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:139)
 ~[httpclient-4.5.2.jar:4.5.2]
   >    at 
org.apache.eventmesh.client.http.http.HttpUtil.post(HttpUtil.java:149) 
~[eventmesh-sdk-java-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
   >    at 
org.apache.eventmesh.client.http.producer.LiteProducer.request(LiteProducer.java:240)
 ~[eventmesh-sdk-java-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
   >    at 
org.apache.eventmesh.http.demo.AsyncSyncRequestInstance.main(AsyncSyncRequestInstance.java:73)
 ~[main/:?]
   > Caused by: com.alibaba.fastjson.JSONException: syntax error,except start 
with { or [,but actually start with error
   >    at 
com.alibaba.fastjson.parser.DefaultJSONParser.parseObject(DefaultJSONParser.java:684)
 ~[fastjson-1.2.71.jar:?]
   >    at com.alibaba.fastjson.JSON.parseObject(JSON.java:396) 
~[fastjson-1.2.71.jar:?]
   >    at com.alibaba.fastjson.JSON.parseObject(JSON.java:300) 
~[fastjson-1.2.71.jar:?]
   >    at com.alibaba.fastjson.JSON.parseObject(JSON.java:573) 
~[fastjson-1.2.71.jar:?]
   >    at 
org.apache.eventmesh.client.http.producer.RRCallbackResponseHandlerAdapter.handleResponse(RRCallbackResponseHandlerAdapter.java:89)
 ~[eventmesh-sdk-java-1.2.0-SNAPSHOT.jar:1.2.0-SNAPSHOT]
   >    ... 7 more
   > ```
   
   
   OK!I will continue to pay attention.


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