Пробую IDEA4.5 + TOMCAT 5.0
debuglю свой первый сервлет
в Debug/Tomcat Server прописано Startup page:
http://localhost:8080/FirstServlet.html
броузером она открывается, пример компелируется

IDEA пишет [Error running Unnamed: Address localhost:8080 is already in use]

(есть Warning: Class 'javax.servlet.jsp.JspPage' not found in application server)

Чего не так?
Может нужна J2EE?

Запускаю debug при не запущенном TOMCAT
в консоли пишет:

cmd /c "C:\Program Files\Apache Software Foundation\Tomcat 5.0\bin\catalina.bat" run
...
Connected to server
Jan 25, 2004 3:15:10 PM org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on port 8080
...
INFO: Processing Context configuration file URL file:C:\Documents and Settings\NIKOLAY\.IntelliJIdea\system\tomcat_Unnamed_b16df8a5\conf\Catalina\localhost\ROOT.xml
Jan 25, 2004 3:15:12 PM org.apache.catalina.core.StandardHostDeployer install
...
INFO: Starting Coyote HTTP/1.1 on port 8080
Jan 25, 2004 3:15:15 PM org.apache.jk.common.ChannelSocket init
INFO: JK2: ajp13 listening on /0.0.0.0:8009
Jan 25, 2004 3:15:15 PM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/111 config=C:\Documents and Settings\NIKOLAY\.IntelliJIdea\system\tomcat_Unnamed_b16df8a5\conf\jk2.properties
Jan 25, 2004 3:15:15 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 5508 ms
Jan 25, 2004 3:15:16 PM org.apache.coyote.tomcat5.CoyoteAdapter service
SEVERE: An exception or error occurred in the container during the request processing
java.lang.NoSuchMethodError: javax.servlet.http.HttpServletRequest.removeAttribute(Ljava/lang/String;)
...

При инсталяции TOMCAT
path of the JVM
я прописал
C:\Program Files\Java\jdk1.5.0_01\jre
не тот?