Я пытаюсь обобщить обработку ошибок для HTTP-запросов и всегда отвечаю фактическим HTTP-кодом ошибки и соответствующим сообщением.
Вот моя проблема: в моем обработчике, который расширяет SimpleChannelUpstreamHandler, exceptionCaught запускается, когда исключение выдается в любом месте стека. Это хорошо. Плохо то, что когда я пытаюсь написать ответ клиенту с соответствующим HTTP-кодом и ответом, запись вызывает исключение, а затем программа входит в бесконечный цикл с вызовом exceptionCaught снова и снова.
Это должно быть обычное задание. Как я могу сделать это правильно?
@Override
public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent event)
throws Exception {
try{
logger.error("Error in handling call: ", event.getCause());
HttpResponse httpResponse = buildHttpResponseObject(UNAUTHORIZED, new StringBuilder("Test"), false, null);
// Write the response.
// for some reason calling this next line causes an infinite loop of exceptionCaught, even with the
// catch below. No idea why. Still investigating. In the meantime, we don't have custom error code responses.
ChannelFuture future = event.getChannel().write(httpResponse);
// Close the connection after the write operation is done, even if it's a keep-alive.
future.addListener(ChannelFutureListener.CLOSE);
}
catch(Exception t){
logger.error("Unable to customize error response. ", t);
event.getChannel().close();
}
}
Вот исключения:
38161 [New I/O server worker #1-1] ERROR nettytests.http.snoop.HttpSnoopServerHandler - Error in handling call:
javax.net.ssl.SSLHandshakeException: null cert chain
at sun.security.ssl.Handshaker.checkThrown(Handshaker.java:1364)
at sun.security.ssl.SSLEngineImpl.checkTaskThrown(SSLEngineImpl.java:513)
at sun.security.ssl.SSLEngineImpl.readNetRecord(SSLEngineImpl.java:790)
at sun.security.ssl.SSLEngineImpl.unwrap(SSLEngineImpl.java:758)
at javax.net.ssl.SSLEngine.unwrap(SSLEngine.java:624)
at org.jboss.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:931)
at org.jboss.netty.handler.ssl.SslHandler.decode(SslHandler.java:649)
at org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:288)
at org.jboss.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:207)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:343)
at org.jboss.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:274)
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:194)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
Caused by: javax.net.ssl.SSLHandshakeException: null cert chain
at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
at sun.security.ssl.SSLEngineImpl.fatal(SSLEngineImpl.java:1639)
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:278)
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:266)
at sun.security.ssl.ServerHandshaker.clientCertificate(ServerHandshaker.java:1627)
at sun.security.ssl.ServerHandshaker.processMessage(ServerHandshaker.java:176)
at sun.security.ssl.Handshaker.processLoop(Handshaker.java:868)
at sun.security.ssl.Handshaker$1.run(Handshaker.java:808)
at sun.security.ssl.Handshaker$1.run(Handshaker.java:806)
at java.security.AccessController.doPrivileged(Native Method)
at sun.security.ssl.Handshaker$DelegatedTask.run(Handshaker.java:1301)
at org.jboss.netty.handler.ssl.SslHandler$3.run(SslHandler.java:1060)
at org.jboss.netty.handler.ssl.ImmediateExecutor.execute(ImmediateExecutor.java:31)
at org.jboss.netty.handler.ssl.SslHandler.runDelegatedTasks(SslHandler.java:1057)
at org.jboss.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:947)
... 11 more
38177 [New I/O server worker #1-1] ERROR nettytests.http.snoop.HttpSnoopServerHandler - Error in handling call:
java.lang.IllegalStateException: cannot send more responses than requests
at org.jboss.netty.handler.codec.http.HttpContentEncoder.writeRequested(HttpContentEncoder.java:104)
at org.jboss.netty.channel.Channels.write(Channels.java:605)
at org.jboss.netty.channel.Channels.write(Channels.java:572)
at org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:245)
at nettytests.http.snoop.HttpSnoopServerHandler.exceptionCaught(HttpSnoopServerHandler.java:201)
at nettytests.logger.RequestAuditLogger.handleUpstream(RequestAuditLogger.java:32)
at org.jboss.netty.handler.codec.replay.ReplayingDecoder.exceptionCaught(ReplayingDecoder.java:456)
at org.jboss.netty.handler.ssl.SslHandler.exceptionCaught(SslHandler.java:554)
at org.jboss.netty.channel.Channels.fireExceptionCaught(Channels.java:426)
at org.jboss.netty.channel.AbstractChannelSink.exceptionCaught(AbstractChannelSink.java:47)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:343)
at org.jboss.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:274)
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:194)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
38177 [New I/O server worker #1-1] ERROR nettytests.http.snoop.HttpSnoopServerHandler - Error in handling call:
java.lang.IllegalStateException: cannot send more responses than requests
at org.jboss.netty.handler.codec.http.HttpContentEncoder.writeRequested(HttpContentEncoder.java:104)
at org.jboss.netty.channel.Channels.write(Channels.java:605)
at org.jboss.netty.channel.Channels.write(Channels.java:572)
at org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:245)
at nettytests.http.snoop.HttpSnoopServerHandler.exceptionCaught(HttpSnoopServerHandler.java:201)
at nettytests.logger.RequestAuditLogger.handleUpstream(RequestAuditLogger.java:32)
at org.jboss.netty.handler.codec.replay.ReplayingDecoder.exceptionCaught(ReplayingDecoder.java:456)
at org.jboss.netty.handler.ssl.SslHandler.exceptionCaught(SslHandler.java:554)
at org.jboss.netty.channel.Channels.fireExceptionCaught(Channels.java:426)
at org.jboss.netty.channel.AbstractChannelSink.exceptionCaught(AbstractChannelSink.java:47)
at org.jboss.netty.channel.Channels.write(Channels.java:605)
at org.jboss.netty.channel.Channels.write(Channels.java:572)
at org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:245)
at nettytests.http.snoop.HttpSnoopServerHandler.exceptionCaught(HttpSnoopServerHandler.java:201)
at nettytests.logger.RequestAuditLogger.handleUpstream(RequestAuditLogger.java:32)
at org.jboss.netty.handler.codec.replay.ReplayingDecoder.exceptionCaught(ReplayingDecoder.java:456)
at org.jboss.netty.handler.ssl.SslHandler.exceptionCaught(SslHandler.java:554)
at org.jboss.netty.channel.Channels.fireExceptionCaught(Channels.java:426)
at org.jboss.netty.channel.AbstractChannelSink.exceptionCaught(AbstractChannelSink.java:47)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:343)
at org.jboss.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:274)
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:194)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
38224 [New I/O server worker #1-1] ERROR nettytests.http.snoop.HttpSnoopServerHandler - Error in handling call:
java.lang.IllegalStateException: cannot send more responses than requests
at org.jboss.netty.handler.codec.http.HttpContentEncoder.writeRequested(HttpContentEncoder.java:104)
at org.jboss.netty.channel.Channels.write(Channels.java:605)
at org.jboss.netty.channel.Channels.write(Channels.java:572)
at org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:245)
at nettytests.http.snoop.HttpSnoopServerHandler.exceptionCaught(HttpSnoopServerHandler.java:201)
at nettytests.logger.RequestAuditLogger.handleUpstream(RequestAuditLogger.java:32)
at org.jboss.netty.handler.codec.replay.ReplayingDecoder.exceptionCaught(ReplayingDecoder.java:456)
at org.jboss.netty.handler.ssl.SslHandler.exceptionCaught(SslHandler.java:554)
at org.jboss.netty.channel.Channels.fireExceptionCaught(Channels.java:426)
at org.jboss.netty.channel.AbstractChannelSink.exceptionCaught(AbstractChannelSink.java:47)
at org.jboss.netty.channel.Channels.write(Channels.java:605)
at org.jboss.netty.channel.Channels.write(Channels.java:572)
at org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:245)
at nettytests.http.snoop.HttpSnoopServerHandler.exceptionCaught(HttpSnoopServerHandler.java:201)
at nettytests.logger.RequestAuditLogger.handleUpstream(RequestAuditLogger.java:32)
at org.jboss.netty.handler.codec.replay.ReplayingDecoder.exceptionCaught(ReplayingDecoder.java:456)
at org.jboss.netty.handler.ssl.SslHandler.exceptionCaught(SslHandler.java:554)
at org.jboss.netty.channel.Channels.fireExceptionCaught(Channels.java:426)
at org.jboss.netty.channel.AbstractChannelSink.exceptionCaught(AbstractChannelSink.java:47)
at org.jboss.netty.channel.Channels.write(Channels.java:605)
at org.jboss.netty.channel.Channels.write(Channels.java:572)
at org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:245)
at nettytests.http.snoop.HttpSnoopServerHandler.exceptionCaught(HttpSnoopServerHandler.java:201)
at nettytests.logger.RequestAuditLogger.handleUpstream(RequestAuditLogger.java:32)
at org.jboss.netty.handler.codec.replay.ReplayingDecoder.exceptionCaught(ReplayingDecoder.java:456)
at org.jboss.netty.handler.ssl.SslHandler.exceptionCaught(SslHandler.java:554)
at org.jboss.netty.channel.Channels.fireExceptionCaught(Channels.java:426)
at org.jboss.netty.channel.AbstractChannelSink.exceptionCaught(AbstractChannelSink.java:47)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:343)
at org.jboss.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:274)
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:194)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
38255 [New I/O server worker #1-1] ERROR nettytests.http.snoop.HttpSnoopServerHandler - Error in handling call:
java.lang.IllegalStateException: cannot send more responses than requests
at org.jboss.netty.handler.codec.http.HttpContentEncoder.writeRequested(HttpContentEncoder.java:104)
at org.jboss.netty.channel.Channels.write(Channels.java:605)
at org.jboss.netty.channel.Channels.write(Channels.java:572)
at org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:245)
at nettytests.http.snoop.HttpSnoopServerHandler.exceptionCaught(HttpSnoopServerHandler.java:201)
at nettytests.logger.RequestAuditLogger.handleUpstream(RequestAuditLogger.java:32)
at org.jboss.netty.handler.codec.replay.ReplayingDecoder.exceptionCaught(ReplayingDecoder.java:456)
at org.jboss.netty.handler.ssl.SslHandler.exceptionCaught(SslHandler.java:554)
at org.jboss.netty.channel.Channels.fireExceptionCaught(Channels.java:426)
at org.jboss.netty.channel.AbstractChannelSink.exceptionCaught(AbstractChannelSink.java:47)
at org.jboss.netty.channel.Channels.write(Channels.java:605)
at org.jboss.netty.channel.Channels.write(Channels.java:572)
at org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:245)
at nettytests.http.snoop.HttpSnoopServerHandler.exceptionCaught(HttpSnoopServerHandler.java:201)
at nettytests.logger.RequestAuditLogger.handleUpstream(RequestAuditLogger.java:32)
at org.jboss.netty.handler.codec.replay.ReplayingDecoder.exceptionCaught(ReplayingDecoder.java:456)
at org.jboss.netty.handler.ssl.SslHandler.exceptionCaught(SslHandler.java:554)
at org.jboss.netty.channel.Channels.fireExceptionCaught(Channels.java:426)
at org.jboss.netty.channel.AbstractChannelSink.exceptionCaught(AbstractChannelSink.java:47)
at org.jboss.netty.channel.Channels.write(Channels.java:605)
at org.jboss.netty.channel.Channels.write(Channels.java:572)
at org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:245)
at nettytests.http.snoop.HttpSnoopServerHandler.exceptionCaught(HttpSnoopServerHandler.java:201)
at nettytests.logger.RequestAuditLogger.handleUpstream(RequestAuditLogger.java:32)
at org.jboss.netty.handler.codec.replay.ReplayingDecoder.exceptionCaught(ReplayingDecoder.java:456)
at org.jboss.netty.handler.ssl.SslHandler.exceptionCaught(SslHandler.java:554)
at org.jboss.netty.channel.Channels.fireExceptionCaught(Channels.java:426)
at org.jboss.netty.channel.AbstractChannelSink.exceptionCaught(AbstractChannelSink.java:47)
at org.jboss.netty.channel.Channels.write(Channels.java:605)
at org.jboss.netty.channel.Channels.write(Channels.java:572)
at org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:245)
at nettytests.http.snoop.HttpSnoopServerHandler.exceptionCaught(HttpSnoopServerHandler.java:201)
at nettytests.logger.RequestAuditLogger.handleUpstream(RequestAuditLogger.java:32)
at org.jboss.netty.handler.codec.replay.ReplayingDecoder.exceptionCaught(ReplayingDecoder.java:456)
at org.jboss.netty.handler.ssl.SslHandler.exceptionCaught(SslHandler.java:554)
at org.jboss.netty.channel.Channels.fireExceptionCaught(Channels.java:426)
at org.jboss.netty.channel.AbstractChannelSink.exceptionCaught(AbstractChannelSink.java:47)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:343)
at org.jboss.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:274)
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:194)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
... повторять до бесконечности.
