Hi we met OutOfMemory issue in our service. we are using dependency below :

        <dependency>
            <groupId>com.refinitiv.eta</groupId>
            <artifactId>eta</artifactId>
            <version>3.6.2.2</version>
        </dependency>        
        <dependency>
            <groupId>com.refinitiv.ema</groupId>
            <artifactId>ema</artifactId>
            <version>3.6.2.2</version>
        </dependency>

we deployed service on our server. running sub rate from trep and posting message to trep too(every 5 mins).

after around 10 hours. OOM issue occur.

we have export the heapdump file and did some analysis.

we found that most memory used by a JsonFactory object.

for more information. big memory used by attribute in JsonFactory:

could you help provide more information about the #elementSetDefDbPool and #fieldSetDefDbPool ?

btw, we are using OmmConsumer.submit to post message. each post event we will create new OmmConsumer and release it after all AckId return backed.

PostMsg postMsg = EmaFactory.createPostMsg();
            UpdateMsg nestedUpdateMsg = EmaFactory.createUpdateMsg();
            FieldList fieldList = fieldListMap.get(ric).getKey();
            StringBuilder fieldListStringBuilder = fieldListMap.get(ric).getValue();
            nestedUpdateMsg.payload(fieldList);

            long currentPostId = postId.incrementAndGet();

            try {
                consumer
                        .submit(
                                postMsg
                                        .postId(currentPostId)
                                        .serviceName(serviceName)
                                        .name(ric)
                                        .solicitAck(true)
                                        .complete(true)
                                        .payload(nestedUpdateMsg)
                                , loginHandle
                        );