[undertow-dev] java.lang.OutOfMemoryError: Direct buffer memory

[Steve Hu]

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)
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