Here's more of the error: java.lang.ClassCastException: org.slf4j.impl.SimpleLoggerFactory at jupiter.messaging.EventSubscriber.<init>(EventSubscriber.java:40) at developerworks.jetty6.CrudMessage.<clinit>(CrudMessage.java:91) at developerworks.jetty6.UserCountServlet.<clinit>(UserCountServlet.java :33) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstruct orAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingC onstructorAccessorImpl.java:27) This is code that run at startup and breaks on (LoggerContext) LoggerFactory.getILoggerFactory(); I am using Maven to keep track of dependencies, I have the following included for logback: <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-core</artifactId> <version>0.9.15</version> </dependency> <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-classic</artifactId> <version>0.9.15</version> </dependency> <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-access</artifactId> <version>0.9.15</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.5.6</version> </dependency> On Wed, May 13, 2009 at 6:43 AM, Ceki Gulcu <ceki@qos.ch> wrote:

Hello Brian,

Could you please post the two or three lines of the stack trace? Which artifacts (jar files) have you placed on the class path?

Brian Moschel wrote:

...

Hey guys,

I am noticing an error on startup:

java.lang.ClassCastException: org.slf4j.impl.SimpleLoggerFactory

I am trying to run the following lines to load my config, which I got from the startup guide:

LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory(); JoranConfigurator configurator = new JoranConfigurator(); lc.reset(); configurator.setContext(lc); configurator.doConfigure(my_path); StatusPrinter.printInCaseOfErrorsOrWarnings(lc);

The error occurs at the first line in the above code. I got this working at some point, but somehow am back in a non-working state. This is a Jetty app. Any tips?

Thanks, Brian

-- Ceki Gülcü Logback: The reliable, generic, fast and flexible logging framework for Java. http://logback.qos.ch _______________________________________________ Logback-user mailing list Logback-user@qos.ch http://qos.ch/mailman/listinfo/logback-user

java.lang.ClassCastException: org.slf4j.impl.SimpleLoggerFactory at jupiter.messaging.EventSubscriber.<init>(EventSubscriber.java:40) at developerworks.jetty6.CrudMessage.<clinit>(CrudMessage.java:91) at developerworks.jetty6.UserCountServlet.<clinit>(UserCountServlet.java:33) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:494) at java.lang.Class.newInstance0(Class.java:350) at java.lang.Class.newInstance(Class.java:303) at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153) at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:253) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:606) at org.mortbay.jetty.servlet.Context.startContext(Context.java:139) at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1221) at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:510) at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:449) at org.mortbay.jetty.plugin.Jetty6PluginWebAppContext.doStart(Jetty6PluginWebAppContext.java:110) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152) at org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 39) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java: 130) at org.mortbay.jetty.Server.doStart(Server.java:222) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 39) at org.mortbay.jetty.plugin.Jetty6PluginServer.start(Jetty6PluginServer. java:132) at com.webtide.hightide.plugin.AbstractHightideMojo.startJetty(AbstractH ightideMojo.java:341) at com.webtide.hightide.plugin.AbstractHightideMojo.execute(AbstractHigh tideMojo.java:271) at com.webtide.hightide.plugin.AbstractHightideRunMojo.execute(AbstractH ightideRunMojo.java:194) at com.webtide.hightide.plugin.HightideRunMojo.execute(HightideRunMojo.j ava:201) at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPlugi nManager.java:451) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(Defa ultLifecycleExecutor.java:558) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandalone Goal(DefaultLifecycleExecutor.java:512) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(Defau ltLifecycleExecutor.java:482) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHan dleFailures(DefaultLifecycleExecutor.java:330) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegmen ts(DefaultLifecycleExecutor.java:291) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLi fecycleExecutor.java:142) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:336) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129) at org.apache.maven.cli.MavenCli.main(MavenCli.java:287) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl. java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces sorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315) at org.codehaus.classworlds.Launcher.launch(Launcher.java:255) at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430) at org.codehaus.classworlds.Launcher.main(Launcher.java:375) [INFO] [dependency:tree] [INFO] com.webtide.hightide:jabbify:war:6.1H.10 [INFO] +- com.webtide.hightide:hightide-server-dependencies:pom:6.1H.10:provided [INFO] | +- org.mortbay.jetty:jetty:jar:6.1H.10:provided [INFO] | | \- org.mortbay.jetty:servlet-api-2.5:jar:6.1H.10:provided [INFO] | +- org.mortbay.jetty:jetty-util:jar:6.1H.10:provided [INFO] | +- org.mortbay.jetty:cometd-bayeux:jar:6.1H.10:provided [INFO] | | \- org.mortbay.jetty:cometd-api:jar:0.9.20080221:provided [INFO] | +- org.mortbay.jetty:jetty-annotations:jar:6.1H.10:provided [INFO] | +- org.mortbay.jetty:jetty-plus:jar:6.1H.10:provided [INFO] | +- org.mortbay.jetty:jsp-2.1:jar:6.1H.10:provided [INFO] | | +- org.eclipse.jdt:core:jar:3.1.1:provided [INFO] | | \- ant:ant:jar:1.6.5:provided [INFO] | +- org.mortbay.jetty:jetty-naming:jar:6.1H.10:provided [INFO] | +- org.mortbay.jetty:jetty-management:jar:6.1H.10:provided [INFO] | +- org.mortbay.jetty:jetty-xbean:jar:6.1H.10:provided [INFO] | | +- org.apache.xbean:xbean-spring:jar:2.2:provided [INFO] | | | +- mx4j:mx4j:jar:3.0.1:provided [INFO] | | | +- commons-logging:commons-logging:jar:1.0.3:provided [INFO] | | | +- backport-util-concurrent:backport-util-concurrent:jar:2.0_01_ pd:provided [INFO] | | | +- stax:stax-api:jar:1.0:provided [INFO] | | | \- qdox:qdox:jar:1.5:provided [INFO] | | \- org.springframework:spring:jar:1.2.8:provided [INFO] | +- org.directwebremoting:dwr:jar:2.0.3:provided [INFO] | +- org.apache.activemq:activemq-web:jar:5.1.0:provided [INFO] | | +- org.apache.activemq:activemq-core:jar:5.1.0:provided [INFO] | | | +- commons-logging:commons-logging-api:jar:1.1:provided [INFO] | | | \- org.apache.camel:camel-core:jar:1.3.0:provided [INFO] | | | +- javax.xml.bind:jaxb-api:jar:2.1:provided [INFO] | | | | \- javax.xml.stream:stax-api:jar:1.0-2:provided [INFO] | | | \- com.sun.xml.bind:jaxb-impl:jar:2.1.3:provided [INFO] | | +- rome:rome:jar:0.8:provided [INFO] | | +- jdom:jdom:jar:1.0:provided [INFO] | | +- xmlpull:xmlpull:jar:1.1.3.4d_b4_min:provided [INFO] | | \- com.thoughtworks.xstream:xstream:jar:1.1.2:provided [INFO] | | \- xpp3:xpp3_min:jar:1.1.3.4.O:provided [INFO] | +- com.atomikos:transactions:jar:3.2.3:provided [INFO] | +- com.atomikos:transactions-api:jar:3.2.3:provided [INFO] | +- com.atomikos:transactions-jta:jar:3.2.3:provided [INFO] | +- com.atomikos:atomikos-util:jar:3.2.3:provided [INFO] | +- org.apache.derby:derby:jar:10.4.1.3:provided [INFO] | +- org.apache.derby:derbytools:jar:10.4.1.3:provided [INFO] | \- org.slf4j:jcl104-over-slf4j:jar:1.3.1:provided [INFO] +- com.webtide.hightide:hightide-provided-apis:pom:6.1H.10:provided [INFO] | +- org.apache.geronimo.specs:geronimo-j2ee-management_1.0_spec:jar:1.1 :provided [INFO] | +- org.apache.geronimo.specs:geronimo-jms_1.1_spec:jar:1.1:provided [INFO] | +- geronimo-spec:geronimo-spec-jta:jar:1.0.1B-rc4:provided [INFO] | +- org.apache.geronimo.specs:geronimo-annotation_1.0_spec:jar:1.1:prov ided [INFO] | +- org.mortbay.jetty:jsp-api-2.1:jar:6.1H.10:provided [INFO] | +- javax.mail:mail:jar:1.4:provided [INFO] | \- javax.activation:activation:jar:1.1:provided [INFO] +- ch.qos.logback:logback-core:jar:0.9.15:compile [INFO] +- ch.qos.logback:logback-classic:jar:0.9.15:compile [INFO] +- ch.qos.logback:logback-access:jar:0.9.15:compile [INFO] +- org.slf4j:slf4j-api:jar:1.5.6:compile [INFO] +- org.slf4j:slf4j-simple:jar:1.5.6:compile [INFO] +- org.slf4j:slf4j-log4j12:jar:1.5.6:compile [INFO] | \- log4j:log4j:jar:1.2.14:compile [INFO] \- org.slf4j:slf4j-jdk14:jar:1.5.6:compile On Wed, May 13, 2009 at 12:40 PM, Ceki Gulcu <ceki@qos.ch> wrote:

Could you post the whole stack trace please (including nested exceptions)? I thought that a few lines would be sufficient but that is not the case.

What does "mvn dependency:tree" give you?

Brian Moschel wrote:

...

Here's more of the error:

java.lang.ClassCastException: org.slf4j.impl.SimpleLoggerFactory at jupiter.messaging.EventSubscriber.<init>(EventSubscriber.java:40) at developerworks.jetty6.CrudMessage.<clinit>(CrudMessage.java:91) at developerworks.jetty6.UserCountServlet.<clinit>(UserCountServlet.java :33) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstruct orAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingC onstructorAccessorImpl.java:27)

This is code that run at startup and breaks on (LoggerContext) LoggerFactory.getILoggerFactory();

I am using Maven to keep track of dependencies, I have the following included for logback: <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-core</artifactId> <version>0.9.15</version> </dependency> <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-classic</artifactId> <version>0.9.15</version> </dependency> <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-access</artifactId> <version>0.9.15</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.5.6</version> </dependency>

On Wed, May 13, 2009 at 6:43 AM, Ceki Gulcu <ceki@qos.ch> wrote:

Hello Brian,

Could you please post the two or three lines of the stack trace? Which artifacts (jar files) have you placed on the class path?

Brian Moschel wrote:

Hey guys,

I am noticing an error on startup:

java.lang.ClassCastException: org.slf4j.impl.SimpleLoggerFactory

I am trying to run the following lines to load my config, which I got from the startup guide:

LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory(); JoranConfigurator configurator = new JoranConfigurator(); lc.reset(); configurator.setContext(lc); configurator.doConfigure(my_path); StatusPrinter.printInCaseOfErrorsOrWarnings(lc);

The error occurs at the first line in the above code. I got this working at some point, but somehow am back in a non-working state. This is a Jetty app. Any tips?

Thanks, Brian

-- Ceki Gülcü Logback: The reliable, generic, fast and flexible logging framework for Java. http://logback.qos.ch _______________________________________________ Logback-user mailing list Logback-user@qos.ch http://qos.ch/mailman/listinfo/logback-user

------------------------------------------------------------------------

_______________________________________________ Logback-user mailing list Logback-user@qos.ch http://qos.ch/mailman/listinfo/logback-user

-- Ceki Gülcü Logback: The reliable, generic, fast and flexible logging framework for Java. http://logback.qos.ch _______________________________________________ Logback-user mailing list Logback-user@qos.ch http://qos.ch/mailman/listinfo/logback-user

Right on. Robert Elliot wrote:

You have slf4j-log4j12.jar, logback-classic.jar and slf4j-simple.jar on your classpath - that's three separate SLF4J implementations. You should have only one (logback-classic, presumably). It's initialising SLF4J Simple, so when you retrieve the SLF4J LoggerFactory it's returning an org.slf4j.impl.SimpleLoggerFactory which you then try and cast to ch.qos.lobgack.LoggerFactory, which naturally fails.

Take slf4j-log4j12.jar and slf4j-simple.jar off your classpath - if you are trying to redirect log4j to slf4j then you need log4j-over-slf4j.jar, not slf4j-log4j12.jar which instead uses log4j as the slf4j implementation.

-- Ceki Gülcü Logback: The reliable, generic, fast and flexible logging framework for Java. http://logback.qos.ch

Brian, It looks like you are including slf4j-simple.jar, slf4j-log4j12.jar and slf4j-jdk14.jar all at the same time. For starters, try including just slf4j-simple.jar. I also see that your are including jcl104-over-slf4j.jar v1.3.1 (provided scope) and simultaneously commons-logging-api.jar v1.1 (provided scope). Try including jcl-over-slf4j.jar v1.5.6 or commons-logging-api.jar but not both. Unfortunately, to do this you would need to exclude jcl104-over-slf4j.jar from derby-tools and commons-logging-api.jar v1.1 from activemq. Note that you also have commons-logging v1.0.3 being imported from mx4j which also would need to be excluded. See also http://day-to-day-stuff.blogspot.com/2007/10/announcement-version-99-does-no... Brian Moschel wrote: [snip]

[INFO] [dependency:tree] [INFO] com.webtide.hightide:jabbify:war:6.1H.10 [INFO] +- com.webtide.hightide:hightide-server-dependencies:pom:6.1H.10:provided

[INFO] | +- org.mortbay.jetty:jetty:jar:6.1H.10:provided [INFO] | | \- org.mortbay.jetty:servlet-api-2.5:jar:6.1H.10:provided [INFO] | +- org.mortbay.jetty:jetty-util:jar:6.1H.10:provided [INFO] | +- org.mortbay.jetty:cometd-bayeux:jar:6.1H.10:provided [INFO] | | \- org.mortbay.jetty:cometd-api:jar:0.9.20080221:provided [INFO] | +- org.mortbay.jetty:jetty-annotations:jar:6.1H.10:provided [INFO] | +- org.mortbay.jetty:jetty-plus:jar:6.1H.10:provided [INFO] | +- org.mortbay.jetty:jsp-2.1:jar:6.1H.10:provided [INFO] | | +- org.eclipse.jdt:core:jar:3.1.1:provided [INFO] | | \- ant:ant:jar:1.6.5:provided [INFO] | +- org.mortbay.jetty:jetty-naming:jar:6.1H.10:provided [INFO] | +- org.mortbay.jetty:jetty-management:jar:6.1H.10:provided [INFO] | +- org.mortbay.jetty:jetty-xbean:jar:6.1H.10:provided [INFO] | | +- org.apache.xbean:xbean-spring:jar:2.2:provided [INFO] | | | +- mx4j:mx4j:jar:3.0.1:provided [INFO] | | | +- commons-logging:commons-logging:jar:1.0.3:provided [INFO] | | | +- backport-util-concurrent:backport-util-concurrent:jar:2.0_01_ pd:provided [INFO] | | | +- stax:stax-api:jar:1.0:provided [INFO] | | | \- qdox:qdox:jar:1.5:provided [INFO] | | \- org.springframework:spring:jar:1.2.8:provided [INFO] | +- org.directwebremoting:dwr:jar:2.0.3:provided [INFO] | +- org.apache.activemq:activemq-web:jar:5.1.0:provided [INFO] | | +- org.apache.activemq:activemq-core:jar:5.1.0:provided [INFO] | | | +- commons-logging:commons-logging-api:jar:1.1:provided [INFO] | | | \- org.apache.camel:camel-core:jar:1.3.0:provided [INFO] | | | +- javax.xml.bind:jaxb-api:jar:2.1:provided [INFO] | | | | \- javax.xml.stream:stax-api:jar:1.0-2:provided [INFO] | | | \- com.sun.xml.bind:jaxb-impl:jar:2.1.3:provided [INFO] | | +- rome:rome:jar:0.8:provided [INFO] | | +- jdom:jdom:jar:1.0:provided [INFO] | | +- xmlpull:xmlpull:jar:1.1.3.4d_b4_min:provided [INFO] | | \- com.thoughtworks.xstream:xstream:jar:1.1.2:provided [INFO] | | \- xpp3:xpp3_min:jar:1.1.3.4.O:provided [INFO] | +- com.atomikos:transactions:jar:3.2.3:provided [INFO] | +- com.atomikos:transactions-api:jar:3.2.3:provided [INFO] | +- com.atomikos:transactions-jta:jar:3.2.3:provided [INFO] | +- com.atomikos:atomikos-util:jar:3.2.3:provided [INFO] | +- org.apache.derby:derby:jar:10.4.1.3:provided [INFO] | +- org.apache.derby:derbytools:jar:10.4.1.3:provided [INFO] | \- org.slf4j:jcl104-over-slf4j:jar:1.3.1:provided [INFO] +- com.webtide.hightide:hightide-provided-apis:pom:6.1H.10:provided [INFO] | +- org.apache.geronimo.specs:geronimo-j2ee-management_1.0_spec:jar:1.1 :provided [INFO] | +- org.apache.geronimo.specs:geronimo-jms_1.1_spec:jar:1.1:provided [INFO] | +- geronimo-spec:geronimo-spec-jta:jar:1.0.1B-rc4:provided [INFO] | +- org.apache.geronimo.specs:geronimo-annotation_1.0_spec:jar:1.1:prov ided [INFO] | +- org.mortbay.jetty:jsp-api-2.1:jar:6.1H.10:provided [INFO] | +- javax.mail:mail:jar:1.4:provided [INFO] | \- javax.activation:activation:jar:1.1:provided [INFO] +- ch.qos.logback:logback-core:jar:0.9.15:compile [INFO] +- ch.qos.logback:logback-classic:jar:0.9.15:compile [INFO] +- ch.qos.logback:logback-access:jar:0.9.15:compile [INFO] +- org.slf4j:slf4j-api:jar:1.5.6:compile [INFO] +- org.slf4j:slf4j-simple:jar:1.5.6:compile [INFO] +- org.slf4j:slf4j-log4j12:jar:1.5.6:compile [INFO] | \- log4j:log4j:jar:1.2.14:compile [INFO] \- org.slf4j:slf4j-jdk14:jar:1.5.6:compile

-- Ceki Gülcü Logback: The reliable, generic, fast and flexible logging framework for Java. http://logback.qos.ch