关于WSO2堆空间的Java日志

Question

我调用了一个端点，它响应了大量数据，不幸的是在WSO2 carbon日志中显示了错误消息。我该怎么解决它呢？谢谢。

    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)

Answer 1

通过查看内存不足问题，很难说出任何关于罪魁祸首的信息。为了找出真正的根本原因，我们必须使用MAT、jprofile等分析工具分析堆转储(由wso2服务器自动创建的堆转储位于such _HOME/repository/logs/heap-dump.hprof中)。

但是，如果响应消息很大，则服务器有可能在保存时发生OOM，并可能在内存中构建响应消息。如果您希望处理大型消息，可以像在doc中那样调优堆内存分配。