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java.lang.NoClassDefFoundError: org/apache/log4j/Category	at java.lang.Class.getDeclaredConstructors0(Native Method)	at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)	at java.lang.Class.getConstructor0(Unknown Source)	at java.lang.Class.getConstructor(Unknown Source)	at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:410)	at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)	at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)	at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209)	at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)	at org.apache.jasper.EmbeddedServletOptions.(EmbeddedServletOptions.java:43)	at org.apache.jasper.servlet.JspServlet.init(JspServlet.java:97)	at org.eclipse.equinox.jsp.jasper.JspServlet.init(JspServlet.java:81)	at org.eclipse.equinox.http.helper.ContextPathServletAdaptor.init(ContextPathServletAdaptor.java:31)	at org.eclipse.equinox.http.servlet.internal.ServletRegistration.init(ServletRegistration.java:64)	at org.eclipse.equinox.http.servlet.internal.ProxyServlet.registerServlet(ProxyServlet.java:140)	at org.eclipse.equinox.http.servlet.internal.HttpServiceImpl.registerServlet(HttpServiceImpl.java:50)	at org.eclipse.equinox.jsp.examples.Activator$HttpServiceTracker.addingService(Activator.java:48)	at org.osgi.util.tracker.ServiceTracker$Tracked.trackAdding(ServiceTracker.java:1064)	at org.osgi.util.tracker.ServiceTracker$Tracked.trackInitialServices(ServiceTracker.java:926)	at org.osgi.util.tracker.ServiceTracker.open(ServiceTracker.java:330)	at org.osgi.util.tracker.ServiceTracker.open(ServiceTracker.java:274)	at org.eclipse.equinox.jsp.examples.Activator.start(Activator.java:26)	at org.eclipse.osgi.framework.internal.core.BundleContextImpl$2.run(BundleContextImpl.java:999)	at java.security.AccessController.doPrivileged(Native Method)	at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:993)	at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:974)	at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:346)	at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:350)	at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1118)	at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:634)	at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:508)	at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:282)	at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:468)	at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:195)	at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:297)