Error on Axis2 deploy
===

I am new to webservice, now I am working on depoly a webservice which is originally built by Spring and Hibernate and consumed by C#. I tried the simple hello world example and it worked fine for me. When I try to depoly the project, I get error on Tomcat:

    Error: org.apache.axis2.deployment.DeploymentException: The following error occurred during schema generation: null at 
    org.apache.axis2.deployment.repository.util.ArchiveReader.processServiceGroup
    (ArchiveReader.java:150) at org.apache.axis2.deployment.ServiceDeployer.deploy 
    (ServiceDeployer.java:82) at 
    org.apache.axis2.deployment.repository.util.DeploymentFileData.deploy
    (DeploymentFileData.java:136) at org.apache.axis2.deployment.DeploymentEngine.doDeploy
    (DeploymentEngine.java:813) at     
    org.apache.axis2.deployment.repository.util.WSInfoList.update
    (WSInfoList.java:144) at org.apache.axis2.deployment.RepositoryListener.update
    (RepositoryListener.java:377) at 
    org.apache.axis2.deployment.RepositoryListener.checkServices    
    (RepositoryListener.java:254) 
    at org.apache.axis2.deployment.DeploymentEngine.loadServices(DeploymentEngine.java:142) 
    at org.apache.axis2.deployment.WarBasedAxisConfigurator.loadServices
    (WarBasedAxisConfigurator.java:283) at 
    org.apache.axis2.context.ConfigurationContextFactory.createConfigurationContext
    (ConfigurationContextFactory.java:95) at 
    org.apache.axis2.transport.http.AxisServlet.initConfigContext(AxisServlet.java:584) at 
    org.apache.axis2.transport.http.AxisServlet.init(AxisServlet.java:454) at 
    org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1173) at 
    org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:993) at 
    org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4187) at 
    org.apache.catalina.core.StandardContext.start(StandardContext.java:4496) at 
    org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791) at 
    org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771) at 
    org.apache.catalina.core.StandardHost.addChild(StandardHost.java:526) at 
    org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:905) at 
    org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:740) at 
    org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:500) at 
    org.apache.catalina.startup.HostConfig.start(HostConfig.java:1277) at 
    org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:321) at 
    org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) 
    atorg.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053) at 
    org.apache.catalina.core.StandardHost.start(StandardHost.java:722) at 
    org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at 
    org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443) at 
    org.apache.catalina.core.StandardService.start(StandardService.java:516) at 
    org.apache.catalina.core.StandardServer.start(StandardServer.java:710) at 
    org.apache.catalina.startup.Catalina.start(Catalina.java:593) at 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) at 
    org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289) at 
    org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414) Caused by: 
    org.apache.axis2.deployment.DeploymentException: The following error occurred during   
    schema generation: null at org.apache.axis2.deployment.ServiceBuilder.populateService
    (ServiceBuilder.java:432) at 
    org.apache.axis2.deployment.repository.util.ArchiveReader.buildServiceGroup
    (ArchiveReader.java:101) at 
    org.apache.axis2.deployment.repository.util.ArchiveReader.processServiceGroup
    (ArchiveReader.java:143) ... 37 more Caused by: 
    org.apache.axis2.deployment.DeploymentException: The following error occurred during 
    schema generation: null at org.apache.axis2.deployment.ServiceBuilder.populateService
    (ServiceBuilder.java:396) ... 39 more Caused by: java.lang.NullPointerException at 
    org.apache.axis2.description.java2wsdl.DefaultSchemaGenerator.generateSchema
    (DefaultSchemaGenerator.java:606) at 
    org.apache.axis2.description.java2wsdl.DefaultSchemaGenerator.generateSchema
    (DefaultSchemaGenerator.java:546 at
    org.apache.axis2.description.java2wsdl.DefaultSchemaGenerator.
    generateSchemaTypeforNameCommon(DefaultSchemaGenerator.java:1092) at 
    org.apache.axis2.description.java2wsdl.DefaultSchemaGenerator.generateSchemaForType 
    (DefaultSchemaGenerator.java:996) at 
    org.apache.axis2.description.java2wsdl.DefaultSchemaGenerator.processMethods
    (DefaultSchemaGenerator.java:385) at 
    org.apache.axis2.description.java2wsdl.DefaultSchemaGenerator.generateSchema
    (DefaultSchemaGenerator.java:273) at
    org.apache.axis2.deployment.util.Utils.fillAxisService
    (Utils.java:468) at org.apache.axis2.deployment.ServiceBuilder.populateService
    (ServiceBuilder.java:388) ... 39 more   

Can somebody help me with this?