[DIRMINA-1145] Mina Server is losing messages

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.4
• Fix Version/s: 2.2.0
• Component/s: Core
• Sprint: Mina Sprint 2.2.0
• Assignee: Jonathan Valliere
• Reporter: Guy Itzhaki
• Created: 28/Jun/21 12:05
• Updated: 12/Oct/21 19:12
• Resolved: 05/Aug/21 16:32

Description

During our tests we found that in some circumstances Mina server loses messages.

From what we understand this happens when client opens connection and then sends message(s) and the server is still busy processing the sessionOpened event while the message the client sent went through the server’s filterChain.

 

Attached is a simple client and server that will help you reproduce the problem, before you run it please perform the following steps:

Configuration:

1. In order to reproduce the problem SSL filter must be defined (already implemented in the attached example)
2. Update the keystore and truststore files locations in addSSLFilter() method in MinaClient and MinaServer
3. Set server break points at:
4. MinaServerHandler#sessionOpened
5. MinaServerHandler#messageReceived
6. org.apache.mina.core.filterchain.IoFilter.NextFilter#messageReceived

1. Set client break points at:
2. MinaClientHandler#sessionOpened

 

Since this is a timing problem you need to run a debugger as described below:

1. Start server
2. Start client
3. At the client at MinaClientHandler#sessionOpened release the break point
4. Release all break points except server’s  MinaServerHandler#sessionOpened
5. After org.apache.mina.core.filterchain.IoFilter.NextFilter#messageReceived completed to process all events, you can release MinaServerHandler#sessionOpened

                 

Expected result:

MinaServerHandler#messageReceived will be invoked with the message sent by the client

Actual result:

MinaServerHandler#messageReceived is not invoked.

 

To use the example, add the following jars to your class path:
commons-lang3-3.9.jar
log4j-api-2.13.3.jar
log4j-core-2.13.3.jar
log4j-jcl-2.13.3.jar
mina-core-2.1.4.jar
slf4j-api-1.7.26.jar
spring-jcl-5.2.12.RELEASE.jar

 

The java we use is AdoptJDK 11.0.8

Issue Links

• duplicates: DIRMINA-1142 Missing messages when sending asynchronously
• is caused by: DIRMINA-1132 TLSv1.3 - MINA randomly fails in reading the message sent by client