Piotr Sobczyk

Chapter 10, question 11.

Answer marked as correct is A that is:

javac -classpath MyJar.jar GetJar.java
java GetJar

But java launcher cannot find myApp.Foo class that resides inside MyJar.jar and MyJar.jar isn't explicitly pointed by -classpath argument in java launcher.
For certainity I prepared the same enviroment as in question:

test - | | - GetJar.java | | - myApp - | | |- Foo.java | | - MyJar.jar - | | - myApp - | |- Foo.class

and invocation of

java GetJar

returns:

Exception in thread "main" java.lang.NoClassDefFoundError: myApp/Foo
at GetJar.main(GetJar.java:3)
Caused by: java.lang.ClassNotFoundException: myApp.Foo
...

For answer A to be correct there should be Foo.class instead of Foo.java in myApp branch OR java part should look like this:

java -classpath .:MyJar.jar GetJar

As in topic. How can I configure logging in Tomcat 6.0.20 so that every log file was truncated (deleted and recreated) everytime I launch application? There would be no problem with it if configuration were still by log4j.xml/properties but I just can't do it now when Juli is logging system .

Ok, some of problem has been partially solved.

It seems that is a real problem only on Linux. Under Windows Tomcat 6.0 logs error messages to one of its log files (localhost.log). I didn't manage to get that on Linux, though.

Of course everything works fine with the same project and the same log4j.properties files on Tomcat 5.5. What's going on with logging system on Tomcat 6?

However I still have a problem with logging on Tomcat 6. Here is my "log4j.properties" file that I placed in WEB-INF/classes directory of my application:

log4j.rootLogger=INFO, R log4j.appender.R=org.apache.log4j.RollingFileAppender log4j.appender.R.File=${catalina.home}/logs/tomcat.log log4j.appender.R.MaxFileSize=10MB log4j.appender.R.MaxBackupIndex=10 log4j.appender.R.layout=org.apache.log4j.PatternLayout log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n

However any messages BELOW info are not logged (for example ERROR). If I set
log4j.rootLogger=all, R

logged are messages of INFO and above levels but I still can't see what are my errors! And there are certainly errors because my application can't start.

Thanks for thorought and gentle explanation, Tom!

Allright, it seems that I finally solved this problem. For everyone who want to deploy seam application on Tomcat: the solution was to put archive jboss-el.jar from Seam distribution into commons/lib directory of Tomcat 5.5 or into lib directory of Tomcat 6. As Tim already said, there is no need to add anything to web.xml.

Is there any more general rule about what files have to be put in Tomcat's (and not in application's lib) to be visible?

Tomcat6 includes the EL implementation library as part of the core server. Tomcat5 did not, so you had to include it in your WAR.

You shouldn't have to code any EL stuff in web.xml normally.

About wchich specific jar(s) are you writing?

el-api.jar? jsp-api.jar? These are only jars that seems to be connected with ek in Tomcat 6 distribution. Howewer I do not want to use standard implementation, but the one from jboss (jboss-el), packaged with jboss-el.jar that I added to my classpath. How can I specify it if not through web.xml

Ok, I added web.xml entry that exception message suggests to add:

<context-param> <param-name>com.sun.faces.expressionFactory</param-name> <param-value>org.jboss.el.ExpressionFactoryImpl</param-value> </context-param>

Now I'm explicitly pointing that I want to user jboss EL implementation of expression factory. However this entry seems to be ignored and the exception remains .

I'm JBoss Seam user and I'm trying to migrate from JBoss to Tomcat 5.5. However the issue I've met seems to have nothing to do with Seam but rather JSF libraries. After adding
JSF libaries (jsf-api.jar,jsf-impl.jar,jstl.jar and even standard.jar from tomcat jsp example like Tomcat documentation advises here: http://www.horstmann.com/bigj2/tomcat-jsf.html), I'm stil getting the same exception:

com.sun.faces.config.ConfigureListener com.sun.faces.config.ConfigurationException: It appears the JSP version of the container is older than 2.1 and unable to locate the EL RI expression factory, com.sun.el.ExpressionFactoryImpl. If not using JSP or the EL RI, make sure the context initialization parameter, com.sun.faces.expressionFactory, is properly set. at com.sun.faces.config.ConfigureListener.registerELResolverAndListenerWithJsp(ConfigureListener.java:546) at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:212) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3795)

Have anyone come along such problem? I Really don't know what to do.

Probably the newest version of Tomcat (6.0) doesn't have this problem but it uses juli logging system at default and it hides all messages of priority higher than INFO which is juli's default level. Can anyone tell me how to set logging configuration file (log4j.properties?) to log at levels higher than INFO? Thanks in advance.