Error in Invoking JAXM based Web Services

Hi,
I am invoking a JAXM SAAJ based Web Service from a Standalone
Client..
Sometime back the application was working fine, but suddenly I
encountered this exception.

This is the exception being thrown

Exception occurred during event dispatching:
java.lang.NoClassDefFoundError: java/util/logging/Logger
at com.sun.xml.messaging.saaj.soap.MessageFactoryImpl .<clinit>(MessageFactoryImpl.java:36)
at java.lang.Class.newInstance0(Native Method)
at java.lang.Class.newInstance(Unknown Source)
at javax.xml.soap.FactoryFinder.newInstance(Unknown Source)
at javax.xml.soap.FactoryFinder.find(Unknown Source)
at javax.xml.soap.MessageFactory.newInstance(Unknown Source)
at com.deitel.jws1.jaxm.client.BookTitlesProxy.<init> (BookTitlesProxy.java:32)
at com.deitel.jws1.jaxm.client.StandaloneClient$1.act ionPerformed(StandaloneClient.java:40)

Any Suggestions...

Thank You,
Sid