SingleSignOn error in server.xml

[Brzezicki, Jerzy]

When I uncomment in server.xml line:

 

<Valve className="org.apache.catalina.authenticator.SingleSignOn"
debug="0"/>
 
I am getting error (below).
Has anyone had similar problem ?
I created testing environment for Tomcat 4.04 inside VAJ4.0 and I am getting
the error there.
 
Jerzy

 

 

 

ERROR reading c:\tomcat\conf\server.xml

At Line 192 /Server/Service/Engine/Host/Valve/
className=org.apache.catalina.authenticator.SingleSignOn debug=99 

 

Catalina.start: java.lang.NullPointerException

java.lang.NullPointerException

            java.lang.Throwable()

            java.lang.Exception()

            java.lang.RuntimeException()

            java.lang.NullPointerException()

            java.lang.String
org.apache.catalina.authenticator.SingleSignOn.toString()

            java.lang.String
org.apache.catalina.authenticator.SingleSignOn.toString()

            java.lang.String java.lang.String.valueOf(java.lang.Object)

            java.lang.StringBuffer
java.lang.StringBuffer.append(java.lang.Object)

            void
org.apache.catalina.util.xml.ObjectCreate.start(org.apache.catalina.util.xml
.SaxContext)

            void
org.apache.catalina.util.xml.XmlMapper.matchStart(org.apache.catalina.util.x
ml.SaxContext)

            void
org.apache.catalina.util.xml.XmlMapper.startElement(java.lang.String,
org.xml.sax.AttributeList)

            void
org.xml.sax.helpers.XMLReaderAdapter.startElement(java.lang.String,
java.lang.String, java.lang.String, org.xml.sax.Attributes)

            void
org.apache.xerces.parsers.SAXParser.startElement(org.apache.xerces.utils.QNa
me, org.apache.xerces.framework.XMLAttrList, int)

            void
org.apache.xerces.validators.common.XMLValidator.callStartElement(org.apache
.xerces.utils.QName)

            boolean
org.apache.xerces.framework.XMLDocumentScanner.scanElement(org.apache.xerces
.utils.QName)

            boolean
org.apache.xerces.framework.XMLDocumentScanner$ContentDispatcher.dispatch(bo
olean)

            boolean
org.apache.xerces.framework.XMLDocumentScanner.parseSome(boolean)

            void
org.apache.xerces.framework.XMLParser.parse(org.xml.sax.InputSource)

            void
org.xml.sax.helpers.XMLReaderAdapter.parse(org.xml.sax.InputSource)

            void javax.xml.parsers.SAXParser.parse(org.xml.sax.InputSource,
org.xml.sax.HandlerBase)

            void javax.xml.parsers.SAXParser.parse(java.io.File,
org.xml.sax.HandlerBase)

            java.lang.Object
org.apache.catalina.util.xml.XmlMapper.readXml(java.io.File,
java.lang.Object)

            void org.apache.catalina.startup.Catalina.start()

            void org.apache.catalina.startup.Catalina.execute()

            void
org.apache.catalina.startup.Catalina.process(java.lang.String [])

            java.lang.Object
java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object [])

            void org.apache.catalina.startup.Bootstrap.main(java.lang.String
[])

            java.lang.Object
java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object [])

            void StartTomcat.main(java.lang.String [])