Hi,
I just had a phone call with Ceki.
The problem was that I had two instances of my application with exactly
the same log4j config.
By using a TelnetAppender only the first could create a socket and the
second failed because the port was already in use.
The same for the RollingFileAppender, normally two jvm can not write to
the same file.
The solution is to avoid having multiple applications with the same log
config by :
a) adapt the config in runtime e.g. increment the port and use a timestamp
for the log file. Haven't done this yet, so I don't have an example.
b) avoid having multiple applications e.g. use a "lock" file
The fact that my application can potentially have other problems with
multiple instances, I implemented b)
The only thing I was wondering/surprised was that log4j blocked my
application with the TelnetAppender. This should not happen because I
can't know which ports on the client side are in use.
( Don't know if this belongs to the dev-list , just added it to complete
the mail )
I had the following exception on startup :
java.net.BindException: Address in use: JVM_Bind
at java.net.PlainSocketImpl.socketBind(Native Method)
at java.net.PlainSocketImpl.bind(PlainSocketImpl.java:447)
at java.net.ServerSocket.<init>(ServerSocket.java:165)
at java.net.ServerSocket.<init>(ServerSocket.java:77)
at
org.apache.log4j.net.TelnetAppender$SocketHandler.<init>(TelnetAppender.java:172)
at
org.apache.log4j.net.TelnetAppender.activateOptions(TelnetAppender.java:62)
at
org.apache.log4j.config.PropertySetter.activate(PropertySetter.java:248)
at
org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:124)
at
org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:88)
at
org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:645)
at
org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:603)
at
org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:500)
at
org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:406)
at
org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:307)
at
org.apache.log4j.PropertyConfigurator.configure(PropertyConfigurator.java:315)
at mgmtplatform.util.Trace.initLogFile(Trace.java:661)
at mgmtplatform.util.Trace.<clinit>(Trace.java:638)
at mgmtplatform.util.CheckLicense.init(CheckLicense.java:476)
at mgmtplatform.util.CheckLicense.<init>(CheckLicense.java:109)
at mgmtplatform.util.CheckLicense.instance(CheckLicense.java:92)
at mgmtplatform.platform.ALMPlatform.main(ALMPlatform.java:175)
and this when logging :
java.lang.NullPointerException
at
org.apache.log4j.net.TelnetAppender.append(TelnetAppender.java:89)
at
org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:222)
at
org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:57)
at org.apache.log4j.Category.callAppenders(Category.java:190)
at org.apache.log4j.Category.forcedLog(Category.java:375)
at org.apache.log4j.Category.error(Category.java:306)
at mgmtplatform.util.Trace.log(Trace.java:146)
at mgmtplatform.als.ALSCmdLoop.run(ALSCmdLoop.java:600)
As said I'm aware of the problem but it should not happen that the
TelnetAppender blocks the application when the port is already in use.
Ceki, thanks for you're help !
Marc
=============================================
Marc Herren
e-mail: [EMAIL PROTECTED]
Tel.: ++41 31 999 39 15
Fax.: ++41 31 999 30 57
ASCOM Transmission Ltd.
Carrier Access / GAAD
Belpstrasse 37
3000 Berne 14
Switzerland
http://www.ascom.ch
http://www.broadnet.ascom.ch
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