NullPointerException when invoking a web service

[Bob Green]

Hi,
I am having the following exception when invoking a web service on the Sun Application server, can someone know how to fix it, thanks in advance!

java.lang.NullPointerException

at org.apache.catalina.loader.WebappClassLoader.findResources(WebappClassLoader.java:1001)

at java.lang.ClassLoader.getResources(ClassLoader.java:1015)

at org.apache.commons.discovery.jdk.JDK12Hooks.getResources(JDK12Hooks.java:150)

at org.apache.commons.discovery.resource.DiscoverResources$1.getNextResources(DiscoverResources.java:153)

at org.apache.commons.discovery.resource.DiscoverResources$1.getNextResource(DiscoverResources.java:129)

at org.apache.commons.discovery.resource.DiscoverResources$1.hasNext(DiscoverResources.java:116)

at org.apache.commons.discovery.resource.names.DiscoverNamesInFile$1.getNextClassNames(DiscoverNamesInFile.java:186)

at org.apache.commons.discovery.resource.names.DiscoverNamesInFile$1.getNextClassName(DiscoverNamesInFile.java:170)

at org.apache.commons.discovery.resource.names.DiscoverNamesInFile$1.hasNext(DiscoverNamesInFile.java:157)

at org.apache.commons.discovery.resource.names.NameDiscoverers$1.getNextIterator(NameDiscoverers.java:143)

at org.apache.commons.discovery.resource.names.NameDiscoverers$1.hasNext(NameDiscoverers.java:126)

at org.apache.commons.discovery.resource.classes.ResourceClassDiscoverImpl$1.getNextResource(ResourceClassDiscoverImpl.java:159)

at org.apache.commons.discovery.resource.classes.ResourceClassDiscoverImpl$1.hasNext(ResourceClassDiscoverImpl.java:147)

at org.apache.axis.configuration.EngineConfigurationFactoryFinder$1.run(EngineConfigurationFactoryFinder.java:120)

at java.security.AccessController.doPrivileged(Native Method)

at org.apache.axis.configuration.EngineConfigurationFactoryFinder.newFactory(EngineConfigurationFactoryFinder.java:113)

at org.apache.axis.configuration.EngineConfigurationFactoryFinder.newFactory(EngineConfigurationFactoryFinder.java:160)

at org.apache.axis.client.Service.getEngineConfiguration(Service.java:813)

at org.apache.axis.client.Service.getAxisClient(Service.java:104)

at org.apache.axis.client.Service.<init>(Service.java:113)

at gov.colorado.test.apps.checkout.services.CheckoutService2.CheckoutService2_ServiceLocator.<init>(Unknown Source)

at us.co.douglas.cjs.presentationlogic.actions.FeeOptionsFormAction.execute(FeeOptionsFormAction.java:101)

at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)

at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)

at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)

at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:767)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:860)

at sun.reflect.GeneratedMethodAccessor182.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:585)

at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:249)

at java.security.AccessController.doPrivileged(Native Method)

at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)

at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:282)

at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:165)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:257)

at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:55)

at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:161)

at java.security.AccessController.doPrivileged(Native Method)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:263)

at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:551)

at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:225)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:173)

at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:551)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)

at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:551)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:132)

at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:551)

at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:933)

at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:185)

at com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:653)

at com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:534)

at com.sun.enterprise.web.connector.grizzly.ProcessorTask.doTask(ProcessorTask.java:403)

at com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:55)

|#]

[Bob Green]

I forgot to mention the NullPointerException only happens when I start up the application server the first time. Once I stop and restart again, this exception goes away.
I don't exactly know what causes the exception, pls. help!

TIA!