NullPointerException in NioBlockingSelector - not a problem though

["Steffen Heil (Mailinglisten)" <li...@steffen-heil.de>]

Hi

I cannot reproduce it, but I've seen the following error in my logs a few
times now:

SEVERE: Error reading request, ignored
java.lang.NullPointerException
        at
org.apache.tomcat.util.net.NioBlockingSelector.read(NioBlockingSelector.java
:193)
        at
org.apache.tomcat.util.net.NioSelectorPool.read(NioSelectorPool.java:246)
        at
org.apache.tomcat.util.net.NioSelectorPool.read(NioSelectorPool.java:227)
        at
org.apache.coyote.http11.upgrade.UpgradeNioProcessor.fillReadBuffer(UpgradeN
ioProcessor.java:183)
        at
org.apache.coyote.http11.upgrade.UpgradeNioProcessor.readSocket(UpgradeNioPr
ocessor.java:144)
        at
org.apache.coyote.http11.upgrade.UpgradeNioProcessor.read(UpgradeNioProcesso
r.java:113)
        at org.apache.catalina.websocket.WsFrame.nextFrame(WsFrame.java:213)
        at
org.apache.catalina.websocket.WsInputStream.nextFrame(WsInputStream.java:68)
        at
org.apache.catalina.websocket.StreamInbound.onData(StreamInbound.java:117)
        at
org.apache.coyote.http11.upgrade.UpgradeProcessor.upgradeDispatch(UpgradePro
cessor.java:83)
        at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(Abstrac
tProtocol.java:583)
        at
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:
1653)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.ja
va:886)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:9
08)
        at java.lang.Thread.run(Thread.java:662)

This error seems to happen only during shutdown.
So it's not a real issue.

I am using an own-build tomcat 7.0.33/rev. 1397285.
I know it's not the current and released version, but it seems that code has
not changed since.

Regards,
  Steffen