clientside logging into a file --> Error java.io.FileOutputStream is a restricted class.

[alex]

Hi Fred,

Ive a problem with clientside logging into a file.
Nothing is getting logged into my file, but all of the client messages
apearing on my console.
I've defined both file and console appender in my log4j.xml.

Im not sure if this is a gwt-lig or a log4j problem.
Maybe you can tell me.

Thank you.

I'm getting following error:

log4j:WARN Error during default initialization
java.lang.NoClassDefFoundError: java.io.FileOutputStream is a
restricted class. Please see the Google App Engine developer's guide
for more details.
at
com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java:
51)
at org.apache.log4j.FileAppender.setFile(FileAppender.java:290)
at
org.apache.log4j.RollingFileAppender.setFile(RollingFileAppender.java:
194)
at org.apache.log4j.FileAppender.activateOptions(FileAppender.java:
164)
at
org.apache.log4j.config.PropertySetter.activate(PropertySetter.java:
257)
at
org.apache.log4j.xml.DOMConfigurator.parseAppender(DOMConfigurator.java:
285)
at
org.apache.log4j.xml.DOMConfigurator.findAppenderByName(DOMConfigurator.java:
171)
at
org.apache.log4j.xml.DOMConfigurator.findAppenderByReference(DOMConfigurator.java:
184)
at
org.apache.log4j.xml.DOMConfigurator.parseChildrenOfLoggerElement(DOMConfigurator.java:
502)
at
org.apache.log4j.xml.DOMConfigurator.parseRoot(DOMConfigurator.java:
471)
at org.apache.log4j.xml.DOMConfigurator.parse(DOMConfigurator.java:
921)
at
org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:
790)
at
org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:
696)
at
org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:
471)
at org.apache.log4j.LogManager.<clinit>(LogManager.java:125)
at org.apache.log4j.Logger.getLogger(Logger.java:105)
at
com.allen_sauer.gwt.log.server.ServerLogImplLog4J.<init>(ServerLogImplLog4J.java:
30)
at com.allen_sauer.gwt.log.client.Log.tryLog4J(Log.java:289)
at com.allen_sauer.gwt.log.client.Log.<clinit>(Log.java:58)
at
com.allen_sauer.gwt.log.server.RemoteLoggerServiceImpl.log(RemoteLoggerServiceImpl.java:
38)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:
100)
at
com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:
562)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:
188)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:
224)
at
com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:
62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
511)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1166)
at
com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:
51)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:
43)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
at
com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:
122)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1157)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
388)
at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
216)
at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
182)
at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
418)
at
com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:
70)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:349)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
542)
at org.mortbay.jetty.HttpConnection
$RequestHandler.content(HttpConnection.java:938)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:
409)
at org.mortbay.thread.QueuedThreadPool
$PoolThread.run(QueuedThreadPool.java:582)

[Fred Sauer]

You can use the RemoteLogger to send those log messages to the server and on the server you can log to a file. The browser does not have direct file system access.

• In your .gwt.xml, turn on the RemoteLogger.
• Log as normal using Log.debug() etc.
• On the server configure log4j via gwt-log to log to a file.

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[alex]

Hello Fred,

I've already configured the first two points.

What exactly do you mean by :
"On the server configure log4j via gwt-log to log to a file. "?



Kind regards,
Alex

[Fred Sauer]

log4j can be configured to write to a file ia log4j.xml or log4.properties. 

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[alex]

Thank you Fred,

I ve solved my first mentioned error by myself :

log4j:WARN Error during default initialization
java.lang.NoClassDefFoundError: java.io.FileOutputStream is a
restricted class. Please see the Google App Engine developer's guide

for more details. ...


The problem is that I was using "Google App Engine" with my GWT
project (no idea why, Ive got no account for app engine).
So I have desabled it under : project properties / google / app
engine / --> uncheck the ckeckbox "Use Google App Engine".

Quite simple solution.


But my problem with writing something into a file still exists.

Its strange because I am able to write into file if the message is
serverside,
but if its coming from the client (Ive got the remotelogger and
systemlogger enabled nothing else)
it just appearing on my console.

Do you have a demo usecase on your google code site where you log a
clientside message into a file on the server?
I was searching for a demo, but I just find one with a console output.
Maybe it would be usefull to have such a demo usecase too.

Kind regards,
Alex

[alex]

Hi,

problem solved by myself.


I have temporarly deleted my log4j.jar from classpath ^^

As Ive added it again. All my logging worked fine.

Kind regards,
Alex

[Fred Sauer]

Browser the source code for clientserverdemo and you'll find examples.

Kind regards,
Alex

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