java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.sun.web.admin.configlib.LdapDatabase.isUserGroupMgmtSupported(LdapDatabase.java:161)
at com.sun.web.admin.mbeans.UserGroupMBean.isUserGroupMgmtSupported(UserGroupMBean.java:244)
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 com.sun.web.admin.mbeans.BaseAdminMBean.invoke(BaseAdminMBean.java:49)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:836)
at com.sun.web.admin.gui.util.MBeanUtil.invoke(MBeanUtil.java:139)
at com.sun.web.admin.gui.util.MBeanUtil.invoke(MBeanUtil.java:39)
at com.sun.web.admin.gui.handlers.CommonHandlers.invokeMBean(CommonHandlers.java:66)
at com.sun.web.admin.gui.handlers.CommonHandlers.invokeWizardMBean(CommonHandlers.java:170)
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 com.sun.enterprise.tools.guiframework.view.DescriptorViewHelper.invokeHandler(DescriptorViewHelper.java:938)
at com.sun.enterprise.tools.guiframework.view.DescriptorViewHelper.invokeHandlers(DescriptorViewHelper.java:875)
at com.sun.enterprise.tools.guiframework.view.DescriptorViewHelper.dispatchEvent(DescriptorViewHelper.java:841)
at com.sun.enterprise.tools.guiframework.view.DescriptorViewHelper.beginChildDisplay(DescriptorViewHelper.java:477)
at com.sun.enterprise.tools.guiframework.view.DescriptorViewBeanBase.beginChildDisplay(DescriptorViewBeanBase.java:168)
at com.iplanet.jato.taglib.TagBase.fireBeginDisplayEvent(TagBase.java:133)
at com.sun.web.ui.taglib.common.CCTagBase.fireBeginDisplayEvent(CCTagBase.java:149)
at com.sun.web.ui.taglib.common.CCTagBase.doEndTag(CCTagBase.java:108)
at org.apache.jsp.jsp.addGroupMembers_jsp._jspx_meth_cc_propertysheet_0(addGroupMembers_jsp.java:347)
at org.apache.jsp.jsp.addGroupMembers_jsp._jspx_meth_cc_pagetitle_0(addGroupMembers_jsp.java:317)
at org.apache.jsp.jsp.addGroupMembers_jsp._jspx_meth_cc_form_0(addGroupMembers_jsp.java:201)
at org.apache.jsp.jsp.addGroupMembers_jsp._jspx_meth_cc_header_0(addGroupMembers_jsp.java:154)
at org.apache.jsp.jsp.addGroupMembers_jsp._jspService(addGroupMembers_jsp.java:99)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:917)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:457)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:917)
at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:398)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:792)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:472)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:353)
at com.iplanet.jato.view.ViewBeanBase.forward(ViewBeanBase.java:340)
at com.iplanet.jato.view.ViewBeanBase.forwardTo(ViewBeanBase.java:261)
at com.sun.enterprise.tools.guiframework.view.DescriptorViewHelper.execute(DescriptorViewHelper.java:338)
at com.sun.enterprise.tools.guiframework.view.DescriptorViewBeanBase.execute(DescriptorViewBeanBase.java:210)
at com.iplanet.jato.view.RequestHandlingViewBase.handleRequest(RequestHandlingViewBase.java:308)

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