[jbosstools-issues] [JBoss JIRA] Created: (JBIDE-2671) opening page fails with "div by zero"

Wed Aug 20 12:51:23 EDT 2008

opening page fails with "div by zero"
-------------------------------------

                 Key: JBIDE-2671
                 URL: https://jira.jboss.org/jira/browse/JBIDE-2671
             Project: Tools (JBoss Tools)
          Issue Type: Bug
          Components: jsp/jsf/xml source editing
         Environment: eclipse 3.4, debian/unstable, linux 2.6.24.4, nightgly build JBossTools-200808200816-nightly-ALL-linux-gtk.zip
            Reporter: arne anka
            Priority: Blocker

tried to open a generated login.xhtml of seam.
the source tab stays gray, but after several attempts it opened somehow in the "visual/source" tab with some visual rendering (which i did not select! in perefernces "source" tab is set as default, visual part is set to 0%). 
"source" and "preview" are still gray and after checking these tabs "visual/source" is as well.
the log shows

!ENTRY org.eclipse.ui 4 0 2008-08-20 18:32:15.210
!MESSAGE Unhandled event loop exception
!STACK 0
java.lang.ArithmeticException: / by zero
        at org.eclipse.swt.custom.SashFormLayout.layout(SashFormLayout.java:175)
        at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1423)
        at org.eclipse.swt.widgets.Composite.layout(Composite.java:919)
        at org.eclipse.swt.widgets.Composite.layout(Composite.java:877)
        at org.jboss.tools.vpe.editor.xpl.CustomSashForm.layout(CustomSashForm.java:232)
        at org.eclipse.swt.widgets.Composite.layout(Composite.java:840)
        at org.jboss.tools.vpe.editor.VpeEditorPart.setVisualMode(VpeEditorPart.java:424)
        at org.jboss.tools.jst.jsp.jspeditor.JSPMultiPageEditor.pageChange(JSPMultiPageEditor.java:228)
        at org.jboss.tools.jst.jsp.jspeditor.JSPMultiPageEditorPart$2.widgetSelected(JSPMultiPageEditorPart.java:106)
        at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:228)
        at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1158)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1182)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1167)
        at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1007)
        at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3242)
        at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:2017)
        at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:320)
        at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1158)
        at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3401)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3033)
        at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2382)
        at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2346)
        at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2198)
        at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:493)
        at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
        at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:488)
        at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
        at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
        at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:382)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
        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.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549)
        at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)
        at org.eclipse.equinox.launcher.Main.run(Main.java:1236)

to me it seems like the visual editor tries to render the page and fails horribly since parameters are missing.
if this is true, it poses two questions:
- why is the ve initialized at all
- why is it not capable to cope with missing parameters -- it should be the case almost every time anything other than plain html is written.
i got the same error for the iText testpage from the itext seam example 
jboss-seam-2.0.1.GA/examples/itext/view/pageSize.xhtml

further attempts to comment out parts of the page resultet in nothing -- the editor tab that was open by default was in no way predictable, and switching to another tab made any tab plain gray.
even a completely commented out page was not opened.

below the code of the page, it is completely generated by seam!

<!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
                      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
                xmlns:s="http://jboss.com/products/seam/taglib"
                xmlns:ui="http://java.sun.com/jsf/facelets"
                xmlns:f="http://java.sun.com/jsf/core"
                xmlns:h="http://java.sun.com/jsf/html"
                xmlns:rich="http://richfaces.org/rich"
                template="layout/template.xhtml">

<ui:define name="body">

    <h:messages styleClass="message"/>

    <h:form id="login">

        <rich:panel>
            <f:facet name="header">Login</f:facet>

            <p>Please login here</p>

            <div class="dialog">
                <h:panelGrid columns="2" rowClasses="prop" columnClasses="name,value">
                    <h:outputLabel for="username">Username</h:outputLabel>
                    <h:inputText id="username" 
                              value="#{identity.username}"/>
                    <h:outputLabel for="password">Password</h:outputLabel>
                    <h:inputSecret id="password" 
                                value="#{identity.password}"/>
                    <h:outputLabel for="rememberMe">Remember me</h:outputLabel>
                    <h:selectBooleanCheckbox id="rememberMe" 
                                          value="#{identity.rememberMe}"/>
                </h:panelGrid>
            </div>

            <p>
              <i>Note - </i> Please use demo/password to log in the first time.  After logging in you may then
              use the User Manager link to manage user accounts.
            </p>

        </rich:panel>

        <div class="actionButtons">
            <h:commandButton value="Login" action="#{identity.login}"/>
        </div>

    </h:form>

 </ui:define> 
</ui:composition>

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