Heap consumed by many org.jboss.sun.net.httpserver.HttpConnections

Environment

• JBoss Enterprise Application Platform (EAP) 6.x

Issue

• We see large amounts of heap usage by many org.jboss.sun.net.httpserver.HttpConnections that have accumulated over a long time. These HttpConnections are retained in org.jboss.sun.net.httpserver.ServerImpl's reqConnetions or rspConnections map.

Resolution

• Set the sun.net.httpserver.maxReqTime and sun.net.httpserver.maxRspTime system properties (in seconds) to close and release such connections from heap after the specified time. These will be released by a background timer task, and the sun.net.httpserver.timerMillis property controls how often that timer runs; default is 1000 ms.

Diagnostic Steps

• Check connection states from the heap dump with the following OQL:

SELECT raw.bbuf.hb.toString(), creationTime, closed, rspStartedTime, time, state.name.value.toString(), selectionKey.channel.localAddress.holder.port, selectionKey.channel.remoteAddress.holder.addr.holder.address FROM org.jboss.sun.net.httpserver.HttpConnection 

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