But if static logs are really a problem:
http://wiki.apache.org/jakarta-commons/Logging/StaticLog
if would do this:
private void doSomething()
{
/// foo
LogFactory.getLog(Xxx.class).debug("blaat")
// bar
}
or
private void doSomething()
{
/// foo
getLog().debug("blaat");
// bar
}
private Log getLog()
{
return LogFactory.getLog(Xxx.class);
}
On 4/26/07, Johan Compagner <[EMAIL PROTECTED]> wrote:
since when does a logger have state?
I am very interrested to know what it is that a logger isn't thread safe.
You configure it through the constructor (so i guess assign final fields)
you don't set any variables after that on it. And you call only info/error
with 1 or to params.... that it needs to log!
johan
On 4/26/07, Matej Knopp <[EMAIL PROTECTED]> wrote:
>
> Yeah, if it really should be a member variable (which makes sense when
> logger is not thread safe), it probably could be something like this:
>
> private transient Logger logger;
>
> private Logger getLogger() {
> if (logger == null) <initializeLogger>;
> return logger;
> }
>
> On 4/26/07, Eelco Hillenius < [EMAIL PROTECTED]> wrote:
> >
> > What's the stack trace you get when you use normal serialization? It
> > should point you to an offending field.
> >
> > If you only get it with JCL, there is probably something in JCL that
> > isn't serializable. You should consider either making it a static variable,
> > getting it only when you need it (don't hold a reference, which is probably
> > quite inefficient), or store it as a transient field, and initiatlize it
> > lazily (check on null) so that it won't be serialized. More work but safe.
> > If you choose the latter, be sure to always do the null check, as
> > serializaing/ deserializing will null the reference.
> >
> > Eelco
> >
> >
> > On 4/25/07, Bjön Limell < [EMAIL PROTECTED]> wrote:
> > >
> > > Maybe I was a bit unclear.
> > >
> > > The problem only occurs when you're using jcl104-over-slf4j (JCL's
> > > Log not slf4j's Logger).
> > >
> > > JCL104-over-slf4j just enables you to use old 'Log log =
> > > LogFactory.getLog ()' with slf4j (without classloading issues etc)
> > >
> > > ps. Same problem with Objects.setObjectStreamFactory(...);
> > >
> > >
> > > On 4/25/07, Justin Morgan < [EMAIL PROTECTED]> wrote:
> > > >
> > > >
> > > > Just a data point...I am using the Wicket 1.3 snapshot jars along
> > > > with SLF4J with no problems; my pages log just fine. The underlying
logging
> > > > implementation I'm using is the Log4J (v1.2) logging system. So
> > > > far I really like slf4j, BTW.
> > > >
> > > > - Justin
> > > >
> > > >
> > > >
> > > > *"Bjön Limell" <[EMAIL PROTECTED]>*
> > > > Sent by: [EMAIL PROTECTED]
> > > >
> > > > 04/25/2007 11:57 AM Please respond to
> > > > [email protected]
> > > >
> > > > To
> > > > [email protected] cc
> > > >
> > > > Subject
> > > > Re: [Wicket-user] SLF4J and wicket
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > btw, im using 1.3.0-incubating-SNAPSHOT
> > > >
> > > > On 4/25/07, Bjön Limell <[EMAIL PROTECTED]> wrote:
> > > > > Sure!
> > > > >
> > > > > ERROR org.apache.wicket.util.lang.Objects
> > > > > "Error serializing object class test.page.SignInPage[object=[Page
> > > > > class = test.page.SignInPage, id = 1, version = 0]]"
> > > > > org.apache.wicket.util.io.WicketSerializeableException: No
> > > > > Serializable constructor found for class
> > > > > org.apache.commons.logging.impl.SLF4JLocationAwareLog
> > > > > test.page.SignInPage->log
> > > > > NOTE: if you feel Wicket is at fault with this exception, please
> > > > > report to the mailing list. You can switch to JDK based
> > > > serialization
> > > > > by calling:
> > > > org.apache.wicket.util.lang.Objects.setObjectStreamFactory(new
> > > > > IObjectStreamFactory.DefaultObjectStreamFactory()) e.g. in the
> > > > init
> > > > > method of your application
> > > > > at org.apache.wicket.util.io.ClassStreamHandler.<init>(
> > > > ClassStreamHandler.java:252)
> > > > > at org.apache.wicket.util.io.ClassStreamHandler.lookup(
> > > > ClassStreamHandler.java:116)
> > > > > at
> > > > org.apache.wicket.util.io.WicketObjectOutputStream.writeObjectOverride
> > > > (WicketObjectOutputStream.java:752)
> > > > > at java.io.ObjectOutputStream.writeObject(
> > > > ObjectOutputStream.java:322)
> > > > > at
> > > >
org.apache.wicket.util.io.ClassStreamHandler$ObjectFieldAndIndex.writeField
> > > > (ClassStreamHandler.java:862)
> > > > > at
> > > > org.apache.wicket.util.io.ClassStreamHandler.writeFields(
> > > > ClassStreamHandler.java:387)
> > > > > at
> > > > org.apache.wicket.util.io.WicketObjectOutputStream.writeObjectOverride
> > > > (WicketObjectOutputStream.java:779)
> > > > > at java.io.ObjectOutputStream.writeObject(
> > > > ObjectOutputStream.java:322)
> > > > > at org.apache.wicket.util.lang.Objects.objectToByteArray
> > > > (Objects.java:1102)
> > > > > at
> > > > org.apache.wicket.protocol.http.FilePageStore.serializePage(
> > > > FilePageStore.java:651)
> > > > > at
> > > > org.apache.wicket.protocol.http.FilePageStore.access$900(
> > > > FilePageStore.java:49)
> > > > > at
> > > > org.apache.wicket.protocol.http.FilePageStore$PageSerializingThread.run
> > > > (FilePageStore.java:237)
> > > > > at java.lang.Thread.run(Thread.java:619)
> > > > >
> > > > > ps. thanks for the SUPER quick response!! ;)
> > > > >
> > > > > On 4/25/07, Eelco Hillenius <[EMAIL PROTECTED]> wrote:
> > > > > > It might be a bug in our custom serialization. Could you
> > > > please paste
> > > > > > the full stack trace please?
> > > > > >
> > > > > > Eelco
> > > > > >
> > > > > > On 4/25/07, Bjön Limell <[EMAIL PROTECTED]> wrote:
> > > > > > > Hi.
> > > > > > >
> > > > > > > Anyone had success with slf4j and wicket pages?
> > > > > > >
> > > > > > > Im getting serializeable exceptions with
> > > > jcl104-over-slf4j-1.3.1.jar:
> > > > > > > org.apache.wicket.util.io.WicketSerializeableException:
> > > > No
> > > > > > > Serializable constructor found for class
> > > > > > > org.apache.commons.logging.impl.SLF4JLocationAwareLog
> > > > > > >
> > > > > > > At the moment I dont need to cluster, but im not sure how
> > > > its gonna be
> > > > > > > later on...
> > > > > > >
> > > > > > >
> > > >
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