Java Development Tools

Hi ,

when im trying to follow Developing Rich Web Applications With Oracle ADF tutorial in this link http://docs.oracle.com/cd/E18941_01/tutorials/jdtut_11r2_55/jdtut_11r2_55_3.html
and in the part ( Add CRUD Operation Components to your Page ) when pressing the CreateInsert i got the error message Cannot invoke method multiply() on null object ,

the logs as below

<Utils> <buildFacesMessage> ADF: Adding the following JSF error message: Cannot invoke method multiply() on null object
java.lang.NullPointerException: Cannot invoke method multiply() on null object
at org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:77)
at org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelper.java:750)
at org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:727)
at org.codehaus.groovy.runtime.callsite.NullCallSite.call(NullCallSite.java:17)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:40)
at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:54)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
at bc4j_model_EmpDetails_AnnualSalary_null_gs.run(bc4j_model_EmpDetails_AnnualSalary_null_gs.groovy:1)
at oracle.jbo.ExprEval.internalEvaluateGroovyScript(ExprEval.java:1200)
at oracle.jbo.ExprEval.doEvaluate(ExprEval.java:1253)
at oracle.jbo.ExprEval.evaluateForRow(ExprEval.java:1075)
at oracle.jbo.server.AttributeDefImpl.evaluateTransientExpression(AttributeDefImpl.java:2131)
at oracle.jbo.server.ViewRowStorage.getAttributeInternal(ViewRowStorage.java:1827)
at oracle.jbo.server.ViewRowImpl.getAttributeValue(ViewRowImpl.java:1962)
at oracle.jbo.server.ViewRowImpl.getAttributeInternal(ViewRowImpl.java:824)
at oracle.jbo.server.ViewRowImpl.getAttrInvokeAccessor(ViewRowImpl.java:906)
at oracle.jbo.server.ViewRowImpl.getAttribute(ViewRowImpl.java:854)
at oracle.jbo.uicli.binding.JUCtrlValueBinding.internalGetAttributeValueFromRow(JUCtrlValueBinding.java:1213)
at oracle.jbo.uicli.binding.JUCtrlValueBinding.getAttributeFromRow(JUCtrlValueBinding.java:764)
at oracle.jbo.uicli.binding.JUCtrlValueBinding.getInputValueInRow(JUCtrlValueBinding.java:3004)
at oracle.jbo.uicli.binding.JUCtrlValueBinding.getInputValue(JUCtrlValueBinding.java:2852)
at oracle.jbo.uicli.binding.JUCtrlValueBinding.getInputValue(JUCtrlValueBinding.java:2841)
at oracle.adfinternal.view.faces.model.binding.FacesCtrlAttrsBinding.getInputValue(FacesCtrlAttrsBinding.java:183)
at oracle.jbo.uicli.binding.JUCtrlValueBinding.internalGet(JUCtrlValueBinding.java:2416)
at oracle.adfinternal.view.faces.model.binding.FacesCtrlAttrsBinding.internalGet(FacesCtrlAttrsBinding.java:275)
at oracle.adf.model.binding.DCControlBinding.get(DCControlBinding.java:749)
at javax.el.MapELResolver.getValue(MapELResolver.java:164)
at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
at com.sun.el.parser.AstValue.getValue(Unknown Source)
at com.sun.el.ValueExpressionImpl.getValue(Unknown Source)
at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
at org.apache.myfaces.trinidad.bean.FacesBeanImpl.getProperty(FacesBeanImpl.java:73)
at oracle.adfinternal.view.faces.renderkit.rich.ValueRenderer.getValue(ValueRenderer.java:184)
at oracle.adfinternal.view.faces.renderkit.rich.SimpleInputBaseRenderer.renderContentStyleAttributes(SimpleInputBaseRenderer.java:512)
at oracle.adfinternal.view.faces.renderkit.rich.SimpleInputBaseRenderer.renderNonElementContent(SimpleInputBaseRenderer.java:397)
at oracle.adfinternal.view.faces.renderkit.rich.FormInputRenderer.encodeAllAsNonElement(FormInputRenderer.java:300)
at oracle.adfinternal.view.faces.renderkit.rich.FormElementRenderer.encodeAll(FormElementRenderer.java:160)
at oracle.adf.view.rich.render.RichRenderer.delegateRenderer(RichRenderer.java:1700)
at oracle.adfinternal.view.faces.renderkit.rich.LabeledInputRenderer.renderFieldCellContents(LabeledInputRenderer.java:228)
at oracle.adfinternal.view.faces.renderkit.rich.LabelLayoutRenderer.renderFieldCell(LabelLayoutRenderer.java:528)
at oracle.adfinternal.view.faces.renderkit.rich.LabelLayoutRenderer.encodeAll(LabelLayoutRenderer.java:305)
at oracle.adfinternal.view.faces.renderkit.rich.LabeledInputRenderer.encodeAll(LabeledInputRenderer.java:215)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
at oracle.adfinternal.view.faces.renderkit.rich.PanelFormLayoutRenderer._encodeFormItem(PanelFormLayoutRenderer.java:1088)
at oracle.adfinternal.view.faces.renderkit.rich.PanelFormLayoutRenderer.access$100(PanelFormLayoutRenderer.java:50)
at oracle.adfinternal.view.faces.renderkit.rich.PanelFormLayoutRenderer$FormColumnEncoder.processComponent(PanelFormLayoutRenderer.java:1604)
at oracle.adfinternal.view.faces.renderkit.rich.PanelFormLayoutRenderer$FormColumnEncoder.processComponent(PanelFormLayoutRenderer.java:1523)
at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:187)
at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:318)
at org.apache.myfaces.trinidad.component.UIXComponent.encodeFlattenedChildren(UIXComponent.java:283)
at oracle.adfinternal.view.faces.renderkit.rich.PanelFormLayoutRenderer._encodeChildren(PanelFormLayoutRenderer.java:420)
at oracle.adfinternal.view.faces.renderkit.rich.PanelFormLayoutRenderer.encodeAll(PanelFormLayoutRenderer.java:208)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer._encodeChild(PanelGroupLayoutRenderer.java:447)
at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer.access$1500(PanelGroupLayoutRenderer.java:30)
at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer$EncoderCallback.processComponent(PanelGroupLayoutRenderer.java:734)
at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer$EncoderCallback.processComponent(PanelGroupLayoutRenderer.java:637)
at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:187)
at org.apache.myfaces.trinidad.component.UIXComponent.processFlattenedChildren(UIXComponent.java:318)
at org.apache.myfaces.trinidad.component.UIXComponent.encodeFlattenedChildren(UIXComponent.java:283)
at oracle.adfinternal.view.faces.renderkit.rich.PanelGroupLayoutRenderer.encodeAll(PanelGroupLayoutRenderer.java:360)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
at oracle.adfinternal.view.faces.renderkit.rich.DecorativeBoxRenderer.encodeFacet(DecorativeBoxRenderer.java:440)
at oracle.adfinternal.view.faces.renderkit.rich.DecorativeBoxRenderer._encodeCenterPane(DecorativeBoxRenderer.java:704)
at oracle.adfinternal.view.faces.renderkit.rich.DecorativeBoxRenderer.encodeAll(DecorativeBoxRenderer.java:380)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
at oracle.adfinternal.view.faces.renderkit.rich.DecorativeBoxRenderer.encodeFacet(DecorativeBoxRenderer.java:440)
at oracle.adfinternal.view.faces.renderkit.rich.DecorativeBoxRenderer._encodeCenterPane(DecorativeBoxRenderer.java:704)
at oracle.adfinternal.view.faces.renderkit.rich.DecorativeBoxRenderer.encodeAll(DecorativeBoxRenderer.java:380)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer.encodeCenterFacet(PanelStretchLayoutRenderer.java:879)
at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer._encodeCenterPane(PanelStretchLayoutRenderer.java:1294)
at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer._encodeMiddlePanes(PanelStretchLayoutRenderer.java:351)
at oracle.adfinternal.view.faces.renderkit.rich.PanelStretchLayoutRenderer.encodeAll(PanelStretchLayoutRenderer.java:316)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:641)
at oracle.adf.view.rich.render.RichRenderer.encodeAllChildrenInContext(RichRenderer.java:3062)
at oracle.adfinternal.view.faces.renderkit.rich.FormRenderer.encodeAll(FormRenderer.java:274)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:624)
at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:3201)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeAllChildren(CoreRenderer.java:641)
at oracle.adf.view.rich.render.RichRenderer.encodeAllChildrenInContext(RichRenderer.java:3062)
at oracle.adfinternal.view.faces.renderkit.rich.DocumentRenderer.encodeAll(DocumentRenderer.java:1277)
at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1452)
at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:511)
at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:923)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1659)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1655)
at oracle.adfinternal.view.faces.component.AdfViewRoot.encodeAll(AdfViewRoot.java:91)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:399)
at org.apache.myfaces.trinidadinternal.application.ViewDeclarationLanguageFactoryImpl$ChangeApplyingVDLWrapper.renderView(ViewDeclarationLanguageFactoryImpl.java:350)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:273)
at org.apache.myfaces.trinidadinternal.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:165)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._renderResponse(LifecycleImpl.java:1027)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:334)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:232)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:313)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:173)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:122)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:468)
at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:468)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:293)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:199)
at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.adf.library.webapp.LibraryFilter.doFilter(LibraryFilter.java:180)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:111)
at java.security.AccessController.doPrivileged(Native Method)
at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:413)
at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:94)
at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:161)
at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:136)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)
<Utils> <buildFacesMessage> ADF: Adding the following JSF error message: Cannot invoke method multiply() on null object

any help please ?