Tomcat 7.0.50 - Starting tomcat get this error "overrides final method start."

[Patel Sufyan (HEALTH AND SOCIAL CARE INFORMATION CENTRE)]

Hi,

I am using Apache Tomcat realm to perform the user authentication and have 
added the following to the server.xml

<Realm appContextLocation="conf/spring-security.xml" 
className="org.springframework.security.adapters.catalina.CatalinaSpringSecurityUserRealm"
 key="my_password" resourceName="UserDatabase"/>

However, since upgrading to Tomcat 7.0.50 from 6.0.39, when starting Tomcat 
service (through Eclipse), I get the error below. From trawling through the net 
I could not find the exact error but I get the feeling that I will need to 
replace this class with something else. Or is there anything I can do/download 
to fix it?

SEVERE: Begin event threw error
java.lang.VerifyError: class 
org.springframework.security.adapters.catalina.CatalinaSpringSecurityUserRealm 
overrides final method start.()V
                at java.lang.ClassLoader.defineClass1(Native Method)
                at java.lang.ClassLoader.defineClass(Unknown Source)
                at java.security.SecureClassLoader.defineClass(Unknown Source)
                at java.net.URLClassLoader.defineClass(Unknown Source)
                at java.net.URLClassLoader.access$100(Unknown Source)
                at java.net.URLClassLoader$1.run(Unknown Source)
                at java.net.URLClassLoader$1.run(Unknown Source)
                at java.security.AccessController.doPrivileged(Native Method)
                at java.net.URLClassLoader.findClass(Unknown Source)
                at java.lang.ClassLoader.loadClass(Unknown Source)
                at java.lang.ClassLoader.loadClass(Unknown Source)
                at 
org.apache.tomcat.util.digester.ObjectCreateRule.begin(ObjectCreateRule.java:144)
                at 
org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1288)
                at 
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Unknown
 Source)
                at 
com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(Unknown
 Source)
                at 
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown
 Source)
                at 
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown
 Source)
                at 
com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown 
Source)
                at 
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
 Source)
                at 
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown 
Source)
                at 
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown 
Source)
                at 
com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
                at 
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown 
Source)
                at 
com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown
 Source)
                at 
org.apache.tomcat.util.digester.Digester.parse(Digester.java:1561)
                at org.apache.catalina.startup.Catalina.load(Catalina.java:616)
                at org.apache.catalina.startup.Catalina.load(Catalina.java:664)
                at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
                at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
                at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown 
Source)
                at java.lang.reflect.Method.invoke(Unknown Source)
                at 
org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:281)
                at 
org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:455)



Thanks in advance

Suf



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