I'm getting a class cast exception when starting up tomcat 7.0.1. I've migrated 
from 6.0.18 to 7.0.1. I got the same error when migrating directly to 7.0.4. 
The error is:

SEVERE: Begin event threw exception
Throwable occurred: java.lang.ClassCastException: 
org.apache.catalina.deploy.SecurityConstraint incompatible with 
org.apache.catalina.deploy.SecurityConstraint
at org.apache.catalina.startup.SetAuthConstraintRule.begin(WebRuleSet.java:745)
 at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1282)
 at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
 at org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(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:1543)
 at 
org.apache.catalina.startup.ContextConfig.parseWebXml(ContextConfig.java:1686)
 at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1201)
 at 
org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:874)
 at 
org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:317)
.
.
.

Jun 11, 2013 2:17:07 PM org.apache.catalina.startup.ContextConfig parseWebXml
SEVERE: Parse error in application web.xml file at 
jndi:/localhost/aldonsecurityservice/WEB-INF/web.xml
Throwable occurred: java.lang.ClassCastException: 
org.apache.catalina.deploy.SecurityConstraint incompatible with 
org.apache.catalina.deploy.SecurityConstraint
at 
org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2687)
 at 
org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2713)
 at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1285)
 at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
 at org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(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 java.lang.reflect.Method.invoke(Method.java:611)
 at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:303)
 at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:431)
Jun 11, 2013 2:17:07 PM org.apache.catalina.startup.ContextConfig parseWebXml
SEVERE: Occurred at line 147 column 20
class load: java/util/LinkedHashMap$2
class load: java/util/LinkedHashMap$ValueIterator
class load: org.apache.catalina.core.StandardWrapperFacade from: 
file:/ALDON/ALDONLS/tomcat_alcsq/lib/catalina.jar
class load: org.apache.catalina.util.InstanceSupport from: 
file:/ALDON/ALDONLS/tomcat_alcsq/lib/catalina.jar
class load: org.apache.catalina.InstanceListener from: 
file:/ALDON/ALDONLS/tomcat_alcsq/lib/catalina.jar
class load: org.apache.catalina.core.StandardWrapperValve from: 
file:/ALDON/ALDONLS/tomcat_alcsq/lib/catalina.jar
class load: javax.servlet.descriptor.TaglibDescriptor from: 
file:/ALDON/ALDONLS/tomcat_alcsq/lib/servlet-api.jar

Is it possible my XML parsers need updating. I'm still using the same ones in 
my WEB-INF/lib of the webapp:

      xalan.jar
      xerces.jar
      xerces-2.6.2.jar
      xml-apis.jar
      xmlrpc-1.2-b1.jar

Thanks,

JMuse

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