Another exception in forms. Sample code included.

[Paul.Helster]

Here is another exception get. I stripped down the code to remove all dependancies to the application but I still get the same error. One this though is that at some pooint, it loaded fine. Is there a cache in designer that may cause a corrupted version to be used? How can I cleanup this cache if this is the case?

I include both the exception, and some smple code.

Code: Select all

!ENTRY com.swtdesigner 4 4 2005-07-20 11:34:15.52
!MESSAGE Designer internal error: null
!STACK 0
java.lang.NullPointerException
   at com.swtdesigner.model.util.ast.ASTNodeUtilities.findMostRecentAssignmentInBlock(ASTNodeUtilities.java:2096)
   at com.swtdesigner.model.util.ast.ASTNodeUtilities.access$0(ASTNodeUtilities.java:2091)
   at com.swtdesigner.model.util.ast.ASTNodeUtilities$10.endVisit(ASTNodeUtilities.java:2144)
   at org.eclipse.jdt.core.dom.MethodInvocation.accept0(MethodInvocation.java:246)
   at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2450)
   at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2497)
   at org.eclipse.jdt.core.dom.VariableDeclarationFragment.accept0(VariableDeclarationFragment.java:224)
   at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2450)
   at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2520)
   at org.eclipse.jdt.core.dom.VariableDeclarationStatement.accept0(VariableDeclarationStatement.java:272)
   at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2450)
   at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2520)
   at org.eclipse.jdt.core.dom.Block.accept0(Block.java:135)
   at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2450)
   at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2497)
   at org.eclipse.jdt.core.dom.MethodDeclaration.accept0(MethodDeclaration.java:501)
   at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2450)
   at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2520)
   at org.eclipse.jdt.core.dom.AnonymousClassDeclaration.accept0(AnonymousClassDeclaration.java:142)
   at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2450)
   at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2497)
   at org.eclipse.jdt.core.dom.ClassInstanceCreation.accept0(ClassInstanceCreation.java:334)
   at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2450)
   at org.eclipse.jdt.core.dom.ASTNode.acceptChildren(ASTNode.java:2520)
   at org.eclipse.jdt.core.dom.MethodInvocation.accept0(MethodInvocation.java:244)
   at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2450)
   at org.eclipse.jdt.core.dom.ASTNode.acceptChild(ASTNode.java:2497)
   at org.eclipse.jdt.core.dom.ExpressionStatement.accept0(ExpressionStatement.java:143)
   at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2450)
   at com.swtdesigner.model.util.ast.ASTNodeUtilities.findMostRecentAssignmentInBlock(ASTNodeUtilities.java:2102)
   at com.swtdesigner.model.util.ast.ASTNodeUtilities.getMostRecentAssignment(ASTNodeUtilities.java:2080)
   at com.swtdesigner.model.JavaInfo.isRepresentedByNoCache(JavaInfo.java:3961)
   at com.swtdesigner.model.JavaInfo.isRepresentedBy(JavaInfo.java:3899)
   at com.swtdesigner.model.swt.layout.LayoutDataInfo$1.visit(LayoutDataInfo.java:58)
   at org.eclipse.jdt.core.dom.MethodInvocation.accept0(MethodInvocation.java:236)
   at org.eclipse.jdt.core.dom.ASTNode.accept(ASTNode.java:2450)
   at com.swtdesigner.model.util.ast.ASTNodeList.accept(ASTNodeList.java:194)
   at com.swtdesigner.model.swt.layout.LayoutDataInfo.findParentSetLayoutDataInvocation(LayoutDataInfo.java:51)
   at com.swtdesigner.model.swt.layout.LayoutDataInfo.acceptAsParent(LayoutDataInfo.java:42)
   at com.swtdesigner.model.parser.JavaInfoParser.isParentAndChild(JavaInfoParser.java:825)
   at com.swtdesigner.model.parser.JavaInfoParser.findParentFor(JavaInfoParser.java:743)
   at com.swtdesigner.model.parser.JavaInfoParser.getRootNodes(JavaInfoParser.java:331)
   at com.swtdesigner.gef.DesignerEditor.parseCompilationUnit(DesignerEditor.java:966)
   at com.swtdesigner.gef.DesignerEditor.handleActivate(DesignerEditor.java:900)
   at com.swtdesigner.gef.DesignerEditor.handleActivate(DesignerEditor.java:866)
   at com.swtdesigner.editors.MultiPageEditor.showDesignEditor(MultiPageEditor.java:325)
   at com.swtdesigner.editors.MultiPageEditor$2.widgetSelected(MultiPageEditor.java:168)
   at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:90)
   at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
   at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:843)
   at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:867)
   at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:852)
   at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:660)
   at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3138)
   at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1922)
   at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:288)
   at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
   at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:843)
   at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3080)
   at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2713)
   at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1699)
   at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1663)
   at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:367)
   at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:143)
   at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:103)
   at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:226)
   at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:376)
   at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:163)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   at java.lang.reflect.Method.invoke(Unknown Source)
   at org.eclipse.core.launcher.Main.invokeFramework(Main.java:334)
   at org.eclipse.core.launcher.Main.basicRun(Main.java:278)
   at org.eclipse.core.launcher.Main.run(Main.java:973)
   at org.eclipse.core.launcher.Main.main(Main.java:948)


Code: Select all

package testWidgets2;

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CCombo;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.forms.events.HyperlinkAdapter;
import org.eclipse.ui.forms.events.HyperlinkEvent;
import org.eclipse.ui.forms.widgets.FormToolkit;
import org.eclipse.ui.forms.widgets.Hyperlink;

public abstract class BaseSelector3 extends Composite {

  private CCombo combo;

  public abstract int launchEditor();
 
  public BaseSelector3(Composite parent, int style) {
    super(parent, style);
    FormToolkit toolkit = new FormToolkit(Display.getCurrent());
    toolkit.adapt(this);
    toolkit.paintBordersFor(this);
    final FormLayout formLayout = new FormLayout();
    formLayout.marginHeight = 1;
    setLayout(formLayout);

    combo = new CCombo(this, SWT.READ_ONLY | SWT.FLAT);
   
    final Hyperlink hyperlink = toolkit.createHyperlink(this, "edit", SWT.NONE);

    final FormData formData_1 = new FormData();
    formData_1.top = new FormAttachment(combo, 0, SWT.TOP);
    formData_1.right = new FormAttachment(100, 0);
    hyperlink.setLayoutData(formData_1);
    hyperlink.addHyperlinkListener(new HyperlinkAdapter() {
      public void linkActivated(HyperlinkEvent e) {
        int ret = launchEditor();
      }
    });

    final FormData formData = new FormData();
    formData.bottom = new FormAttachment(100, -1);
    formData.top = new FormAttachment(0, 1);
    formData.right = new FormAttachment(hyperlink, -5, SWT.LEFT);
    formData.left = new FormAttachment(0, 1);
    combo.setLayoutData(formData);
    toolkit.adapt(combo);
    combo.addSelectionListener(new SelectionListener() {
      public void widgetDefaultSelected(SelectionEvent e) {
      }
      public void widgetSelected(SelectionEvent e) {
        //fireModificationEvent();
      }
    });

    //
  }
 

  public void dispose() {
    super.dispose();
  }

  protected void checkSubclass() {
  }
}


[Paul.Helster]

I found the source of the problem: there is an abstract method in this abstract class. The assignement using this abstract method

Code: Select all

int ret = launchEditor();


causes designer to throw an exception.

If I comment out this line, it loads and renders fine.

I have many classes like this that are abstract. Is this supposed to be well supported or am I stretching it?

[Paul.Helster]

In fact, any call to an abstract method in a UI class causes the same exception.

[Eric Clayberg]

In fact, any call to an abstract method in a UI class causes the same exception.

Designer can't execute abstract code within a class being edited.

Rather than comment the code our, you can hide it from the parser with a code hiding tag.

Code: Select all

int ret = launchEditor(); //$hide$

[Paul.Helster]

Code: Select all

int ret = launchEditor(); //$hide$


Thanks, this worked. Note that this exact code was not causing any problems in 4.0.1.

[Eric Clayberg]

Thanks, this worked. Note that this exact code was not causing any problems in 4.0.1.

Major improvements have been made in Designer's ability to display dynamically computed values at design time. We can now parse and evaluate a much greater range of code than we could in the past.