1. Install tomcat7 in my home directory and set up `CATALINA_HOME`    environment variable in `.bashrc` 2. Install oracle-java and setup JAVA_HOME in `.bashrc` 3. Install Netbeans 7 and import the project in it. 4. Since, the Netbeans came with `glassfish` as default server, I added    a tomcat as the server with proper configuration. 5. I try running the application (through Netbeans), and I receive the following error:Jun 04, 2013 2:39:58 AM org.apache.catalina.core.AprLifecycleListener init  2 INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /usr/java/packages/lib/amd64:/usr/lib64:/lib64:/        lib:/usr/lib  3 Jun 04, 2013 2:39:59 AM org.apache.coyote.AbstractProtocol init  4 INFO: Initializing ProtocolHandler ["http-bio-8080"]  5 Jun 04, 2013 2:39:59 AM org.apache.coyote.AbstractProtocol init  6 INFO: Initializing ProtocolHandler ["ajp-bio-8009"]  7 Jun 04, 2013 2:39:59 AM org.apache.catalina.startup.Catalina load  8 INFO: Initialization processed in 1100 ms  9 Jun 04, 2013 2:39:59 AM org.apache.catalina.core.StandardService startInternal 10 INFO: Starting service Catalina 11 Jun 04, 2013 2:39:59 AM org.apache.catalina.core.StandardEngine startInternal 12 INFO: Starting Servlet Engine: Apache Tomcat/7.0.40 13 Jun 04, 2013 2:39:59 AM org.apache.catalina.startup.HostConfig deployDescriptor 14 INFO: Deploying configuration descriptor /home/frrole/apache-tomcat-7.0.40/conf/Catalina/localhost/ws.xml 15 Jun 04, 2013 2:39:59 AM org.apache.catalina.startup.HostConfig deployDescriptor 16 WARNING: A docBase /home/frrole/apache-tomcat-7.0.40/webapps/projectfrrole/target/ws inside the host appBase has been specified, and will be ignored 17 Jun 04, 2013 2:40:00 AM org.apache.catalina.core.ContainerBase addChildInternal 18 SEVERE: ContainerBase.addChild: start: 19 org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/ws]] 20     at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) 21     at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) 22     at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) 23     at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633) 24     at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:657) 25     at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1636) 26     at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) 27     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) 28     at java.util.concurrent.FutureTask.run(FutureTask.java:166) 29     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 30     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 31     at java.lang.Thread.run(Thread.java:722) 32 Caused by: java.lang.NoClassDefFoundError: Lorg/slf4j/Logger; 33     at java.lang.Class.getDeclaredFields0(Native Method) 34     at java.lang.Class.privateGetDeclaredFields(Class.java:2317) 35     at java.lang.Class.getDeclaredFields(Class.java:1762) 36     at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:106) 37     at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:261) 38     at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:140) 39     at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:67) 40     at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:405) 41     at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:881) 42     at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:369) 43     at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) 44     at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) 45     at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5269) 46     at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 47     ... 11 more 48 Caused by: java.lang.ClassNotFoundException: org.slf4j.Logger 49     at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)