Hi, I am working on the benchmark tests for TechEmpower and the following handler got OutOfMemoryError. The tricky thing is 1.2.5.Final works fine but 1.4.4.Final/1.4.10.Final fails with the error. I am wondering what has been changed between 1.2 and 1.4 might cause the problem. The application is running within a vagrant environment and memory might be constraint. Thanks, Steve public class PlaintextGetHandler implements HttpHandler { private static final String MESSAGE = "Hello, World!"; @Override public void handleRequest(HttpServerExchange exchange) throws Exception { exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "text/plain"); exchange.getResponseSender().send(MESSAGE); } } and the stacktrace Server light-java: java.lang.OutOfMemoryError: Direct buffer memory Server light-java: at java.nio.Bits.reserveMemory(Bits.java:693) Server light-java: at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:123) Server light-java: at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:311) Server light-java: at io.undertow.server.DefaultByteBufferPool.allocate(DefaultByteBufferPool.java:146) Server light-java: at io.undertow.server.protocol.http.PipeliningBufferingStreamSinkConduit.write(PipeliningBufferingStreamSinkConduit.java:98) Server light-java: at io.undertow.server.protocol.http.HttpResponseConduit.processWrite(HttpResponseConduit.java:250) Server light-java: at io.undertow.server.protocol.http.HttpResponseConduit.write(HttpResponseConduit.java:596) Server light-java: at io.undertow.conduits.AbstractFixedLengthStreamSinkConduit.write(AbstractFixedLengthStreamSinkConduit.java:106) Server light-java: at io.undertow.conduits.AbstractFixedLengthStreamSinkConduit.write(AbstractFixedLengthStreamSinkConduit.java:120) Server light-java: at org.xnio.conduits.ConduitStreamSinkChannel.write(ConduitStreamSinkChannel.java:154) Server light-java: at io.undertow.channels.DetachableStreamSinkChannel.write(DetachableStreamSinkChannel.java:187) Server light-java: at io.undertow.server.HttpServerExchange$WriteDispatchChannel.write(HttpServerExchange.java:2021) Server light-java: at io.undertow.io.AsyncSenderImpl.send(AsyncSenderImpl.java:219) Server light-java: at io.undertow.io.AsyncSenderImpl.send(AsyncSenderImpl.java:310) Server light-java: at io.undertow.io.AsyncSenderImpl.send(AsyncSenderImpl.java:282) Server light-java: at io.undertow.io.AsyncSenderImpl.send(AsyncSenderImpl.java:316) Server light-java: at com.networknt.techempower.handler.PlaintextGetHandler.handleRequest(PlaintextGetHandler.java:20) Server light-java: at io.undertow.server.RoutingHandler.handleRequest(RoutingHandler.java:93) Server light-java: at io.undertow.server.handlers.SetHeaderHandler.handleRequest(SetHeaderHandler.java:90) Server light-java: at io.undertow.server.Connectors.executeRootHandler(Connectors.java:211) Server light-java: at io.undertow.server.protocol.http.HttpReadListener.handleEventWithNoRunningRequest(HttpReadListener.java:243) Server light-java: at io.undertow.server.protocol.http.HttpReadListener.handleEvent(HttpReadListener.java:134) Server light-java: at io.undertow.server.protocol.http.HttpReadListener.handleEvent(HttpReadListener.java:58) Server light-java: at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92) Server light-java: at org.xnio.conduits.ReadReadyHandler$ChannelListenerHandler.readReady(ReadReadyHandler.java:66) Server light-java: at org.xnio.nio.NioSocketConduit.handleReady(NioSocketConduit.java:88) Server light-java: at org.xnio.nio.WorkerThread.run(WorkerThread.java:559) _______________________________________________ undertow-dev mailing list undertow-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/undertow-dev