java.lang.reflect.InvocationTargetException问题,高手教我.

kindhyh

我在发送工作流的过程中,出现了此问题,工作流前几步没问题,只是到某一步的时候出了问题.
java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at psdi.webclient.system.beans.DataBean.callBeanMethod(DataBean.java:532
3)
        at psdi.webclient.system.beans.DataBean.callMethod(DataBean.java:5143)
        at psdi.webclient.system.beans.DataBean.callMethod(DataBean.java:5131)
        at psdi.webclient.system.controller.Utility.handleDialogOK(Utility.java:
1572)
        at jsp_servlet._webclient._controls._dialog.__control._jspService(__cont
rol.java:1391)
        at weblogic.servlet.jsp.JspBase.service(JspBase.java:33)
        at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run
(ServletStubImpl.java:1006)
        at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
pl.java:419)
        at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
pl.java:315)
        at weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispat
cherImpl.java:638)
        at weblogic.servlet.internal.RequestDispatcherImpl.include(RequestDispat
cherImpl.java:423)
        at psdi.webclient.system.controller.ControlHandler.handleEvent(ControlHa
ndler.java:190)
        at psdi.webclient.system.controller.RequestHandler.handleEvent(RequestHa
ndler.java:728)
        at psdi.webclient.system.controller.RequestHandler.handleRequest(Request
Handler.java:293)
        at psdi.webclient.servlet.WebClientServlet.handleRequest(WebClientServle
t.java:114)
        at psdi.webclient.servlet.WebClientServlet.doPost(WebClientServlet.java:
44)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run
(ServletStubImpl.java:1006)
        at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
pl.java:419)
        at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
pl.java:315)
        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationActio
n.run(WebAppServletContext.java:6718)
        at weblogic.security.acl.internal.AuthenticatedSubject.doAs(Authenticate
dSubject.java:321)
        at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:
121)
        at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppSe
rvletContext.java:3764)
        at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestIm
pl.java:2644)
        at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
        at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
Caused by: java.lang.NullPointerException
        at ydsy.app.ydsaplld.YDSaplldStatusHandler.changeStatus(YDSaplldStatusHa
ndler.java:33)
        at psdi.mbo.StatefulMbo.changeStatus(StatefulMbo.java:228)
        at psdi.common.action.Action.executeChangeStatus(Action.java:369)
        at psdi.common.action.Action.executeAction(Action.java:193)
        at psdi.common.action.Action.executeActionGroup(Action.java:235)
        at psdi.common.action.Action.executeAction(Action.java:201)
        at psdi.workflow.WFAction.applyWorkflowAction(WFAction.java:158)
        at psdi.workflow.WFNode.applyWorkflowAction(WFNode.java:189)
        at psdi.workflow.WFCallStackSet.applyWorkflowAction(WFCallStackSet.java:
223)
        at psdi.workflow.WFCallStackSet.completeWorkflowAssignment(WFCallStackSe
t.java:171)
        at psdi.workflow.WFInstance.completeWorkflowAssignment(WFInstance.java:1
57)
        at psdi.workflow.virtual.CompleteWFSet.execute(CompleteWFSet.java:68)
        at psdi.webclient.system.beans.WorkflowBean.execute(WorkflowBean.java:75
)
        ... 32 more