[play-2.4.3 Java] Exception caught in Netty

[Enrico Morelli]

Sometimes I see the following excpetion on the Play console:

[info] p.c.s.NettyServer - Listening for HTTP on /0:0:0:0:0:0:0:0:8080

(Server started, use Ctrl+D to stop and go back to the console...)

[info] - play.api.Play - Application started (Dev)
[error] - play.core.server.netty.PlayDefaultUpstreamHandler - Exception caught in Netty
java.lang.IllegalArgumentException: empty text
    at org.jboss.netty.handler.codec.http.HttpVersion.<init>(HttpVersion.java:89) ~[netty-3.10.4.Final.jar:na]
    at org.jboss.netty.handler.codec.http.HttpVersion.valueOf(HttpVersion.java:62) ~[netty-3.10.4.Final.jar:na]
    at org.jboss.netty.handler.codec.http.HttpRequestDecoder.createMessage(HttpRequestDecoder.java:75) ~[netty-3.10.4.Final.jar:na]
    at org.jboss.netty.handler.codec.http.HttpMessageDecoder.decode(HttpMessageDecoder.java:191) ~[netty-3.10.4.Final.jar:na]
    at org.jboss.netty.handler.codec.http.HttpMessageDecoder.decode(HttpMessageDecoder.java:102) ~[netty-3.10.4.Final.jar:na]
    at org.jboss.netty.handler.codec.replay.ReplayingDecoder.callDecode(ReplayingDecoder.java:500) ~[netty-3.10.4.Final.jar:na]
    at org.jboss.netty.handler.codec.replay.ReplayingDecoder.messageReceived(ReplayingDecoder.java:435) ~[netty-3.10.4.Final.jar:na]
    at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70) ~[netty-3.10.4.Final.jar:na]
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564) [netty-3.10.4.Final.jar:na]
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559) [netty-3.10.4.Final.jar:na]
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268) [netty-3.10.4.Final.jar:na]
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255) [netty-3.10.4.Final.jar:na]
    at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88) [netty-3.10.4.Final.jar:na]
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:108) [netty-3.10.4.Final.jar:na]
    at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:337) [netty-3.10.4.Final.jar:na]
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89) [netty-3.10.4.Final.jar:na]
    at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178) [netty-3.10.4.Final.jar:na]
    at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108) [netty-3.10.4.Final.jar:na]
    at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42) [netty-3.10.4.Final.jar:na]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_51]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_51]
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_51]


No one is using the application. It's happen without user intervention.
Someone can tell me why?

Thanks

[Enrico Morelli]

No one knows where I've to investigate so solve the issue?

[James Roper]

Hi Enrico,

This is typically caused by a non HTTP client connecting to your webserver.

Regards,

James

On 23 September 2015 at 19:51, Enrico Morelli <enrico....@gmail.com> wrote:

No one knows where I've to investigate so solve the issue?

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[Enrico Morelli]

On Thursday, September 24, 2015 at 3:27:22 AM UTC+2, James Roper wrote:

Hi Enrico,

This is typically caused by a non HTTP client connecting to your webserver.

Regards,

James

Thank you, James.

[Chafik H'nini]

Same error here.

Maybe Play should handle the NullPointerException or IllegalArgumentException thrown by Netty and throw a more semantic exception for us to be able to catch it and return a response accordingly ?

Thanks.