[CentOS] Problem with Tomcat

Hi,

Tomcat was running well and suddenly stop of working.

I am using tomcat5-5.5.23-0jpp.7.el5_2.1 on Centos 5.2


/etc/tomcat5/tomcat5.conf looks like as follows:
JAVA_HOME="/usr/lib/jvm/java"
CATALINA_HOME="/usr/share/tomcat5"
JASPER_HOME="/usr/share/tomcat5"
CATALINA_TMPDIR="/usr/share/tomcat5/temp"
JAVA_ENDORSED_DIRS="/usr/share/tomcat5/common/endorsed"
JAVA_OPTS="$JAVA_OPTS
-Dcatalina.ext.dirs=$CATALINA_HOME/shared/lib:$CATALINA_HOME/common/lib"
TOMCAT_USER="tomcat"
SHUTDOWN_WAIT=30
CATALINA_PID=/var/run/tomcat5.pid


And  var/log/tomcat5/catalina.out has:

SEVERE: Begin event threw error
java.lang.NoClassDefFoundError: javax/servlet/http/HttpServletRequest
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
	at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
	at java.lang.Class.getDeclaredMethods0(Native Method)
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
	at java.lang.Class.privateGetPublicMethods(Class.java:2547)
	at java.lang.Class.getMethods(Class.java:1410)
	at org.apache.tomcat.util.IntrospectionUtils.findMethods(IntrospectionUtils.java:812)
	at org.apache.tomcat.util.IntrospectionUtils.setProperty(IntrospectionUtils.java:268)
	at org.apache.catalina.startup.SetAllPropertiesRule.begin(SetAllPropertiesRule.java:59)
	at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1276)
	at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
	at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown
Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown
Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
	at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
	at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
	at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
	at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1562)
	at org.apache.catalina.startup.Catalina.load(Catalina.java:490)
	at org.apache.catalina.startup.Catalina.load(Catalina.java:524)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:267)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)
Caused by: java.lang.ClassNotFoundException:
javax.servlet.http.HttpServletRequest
	at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
	... 38 more
java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:267)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)
Caused by: java.lang.NoClassDefFoundError: javax/servlet/http/HttpServletRequest
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
	at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
	at java.lang.Class.getDeclaredMethods0(Native Method)
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
	at java.lang.Class.privateGetPublicMethods(Class.java:2547)
	at java.lang.Class.getMethods(Class.java:1410)
	at org.apache.tomcat.util.IntrospectionUtils.findMethods(IntrospectionUtils.java:812)
	at org.apache.tomcat.util.IntrospectionUtils.setProperty(IntrospectionUtils.java:268)
	at org.apache.catalina.startup.SetAllPropertiesRule.begin(SetAllPropertiesRule.java:59)
	at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1276)
	at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
	at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown
Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown
Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
	at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
	at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
	at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
	at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1562)
	at org.apache.catalina.startup.Catalina.load(Catalina.java:490)
	at org.apache.catalina.startup.Catalina.load(Catalina.java:524)
	... 6 more
Caused by: java.lang.ClassNotFoundException:
javax.servlet.http.HttpServletRequest
	at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
	... 38 more

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