关于Java堆空间的WSO2 EI日志

我调用了一个端点，它的响应是一个大数据，不幸的是在WSO2碳日志中显示了错误消息。我怎样才能解决它？多谢各位

    TID: [-1] [] [2018-02-26 17:48:47,869] ERROR {org.wso2.carbon.das.messageflow.data.publisher.data.MessageFlowObserverStore} -  Error occurred while notifying the statistics observer {org.wso2.carbon.das.messageflow.data.publisher.data.MessageFlowObserverStore}
java.lang.OutOfMemoryError: Java heap space
    at java.util.Arrays.copyOf(Arrays.java:3236)
    at java.io.ByteArrayOutputStream.grow(ByteArrayOutputStream.java:118)
    at java.io.ByteArrayOutputStream.ensureCapacity(ByteArrayOutputStream.java:93)
    at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:153)
    at com.esotericsoftware.kryo.io.Output.flush(Output.java:181)
    at com.esotericsoftware.kryo.io.Output.require(Output.java:160)
    at com.esotericsoftware.kryo.io.Output.writeString_slow(Output.java:462)
    at com.esotericsoftware.kryo.io.Output.writeString(Output.java:363)
    at com.esotericsoftware.kryo.serializers.DefaultSerializers$StringSerializer.write(DefaultSerializers.java:191)
    at com.esotericsoftware.kryo.serializers.DefaultSerializers$StringSerializer.write(DefaultSerializers.java:184)
    at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:628)
    at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:100)
    at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:40)
    at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:628)
    at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:100)
    at com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:40)
    at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:628)
    at com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.java:113)
    at com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.java:39)
    at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:534)
    at org.wso2.carbon.das.messageflow.data.publisher.publish.StatisticsPublisher.addEventData(StatisticsPublisher.java:116)
    at org.wso2.carbon.das.messageflow.data.publisher.publish.StatisticsPublisher.process(StatisticsPublisher.java:67)
    at org.wso2.carbon.das.messageflow.data.publisher.observer.DASMediationFlowObserver.updateStatistics(DASMediationFlowObserver.java:55)
    at org.wso2.carbon.das.messageflow.data.publisher.data.MessageFlowObserverStore.notifyObservers(MessageFlowObserverStore.java:71)
    at org.wso2.carbon.das.messageflow.data.publisher.services.MessageFlowReporterThread.processAndPublishEventList(MessageFlowReporterThread.java:225)
    at org.wso2.carbon.das.messageflow.data.publisher.services.MessageFlowReporterThread.run(MessageFlowReporterThread.java:95)

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通过查看内存不足的问题，很难说出有关罪犯的任何信息。为了找出实际的根本原因，我们必须使用分析工具分析heapdump（wso2服务器将在CARBON_HOME/repository/logs/heap dump.hprof中自动创建heapdump），如

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但是，如果响应消息很大，则服务器可能会在保存时出错，并在内存中生成响应消息。如果要处理大型消息，可以调整堆内存分配，如中所示。

My response data size为11.6 MB。我已经将堆内存设置为4G，上面仍然有错误。我分析了heapdump也没有什么特别的。你还有别的想法吗？谢谢。对于大小在6MB到15MB之间的邮件，我也有同样的问题