Unknown GUI toolkit Error

[et1113]

I'm using Windows 10 version 21H2, Eclipse Version: 2022-09 (4.25.0), and Oracle JDK version 18.01.1

I have uninstalled and reinstalled WindowBuilder multiple times to try to fix this issue. I have also tried to install older versions, installing from the zip and installing from all of the available software sites listed below, and I still can't get rid of the error (full error code pasted below). Any suggestions?

 

Full context stack trace:
org.eclipse.wb.internal.core.utils.exception.DesignerException: 103 (Unknown GUI toolkit). guiIntro.LabGuiIntro
at org.eclipse.wb.internal.core.parser.JavaInfoParser.prepareParseContext(JavaInfoParser.java:1204)
at org.eclipse.wb.internal.core.parser.JavaInfoParser.parse(JavaInfoParser.java:244)
at org.eclipse.wb.internal.core.parser.JavaInfoParser$1.runObject(JavaInfoParser.java:153)
at org.eclipse.wb.internal.core.parser.JavaInfoParser$1.runObject(JavaInfoParser.java:1)
at org.eclipse.wb.internal.core.utils.execution.ExecutionUtils.runDesignTime(ExecutionUtils.java:160)
at org.eclipse.wb.internal.core.parser.JavaInfoParser.parse(JavaInfoParser.java:150)
at org.eclipse.wb.internal.core.editor.DesignPage.internal_refreshGEF(DesignPage.java:553)
at org.eclipse.wb.internal.core.editor.DesignPage$8$1.run(DesignPage.java:468)
at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:183)
at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:133)
at org.eclipse.swt.widgets.Display.syncExec(Display.java:4792)
at org.eclipse.wb.internal.core.editor.DesignPage$8.run(DesignPage.java:464)
at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:434)
at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:352)
at org.eclipse.jface.dialogs.ProgressMonitorDialog.run(ProgressMonitorDialog.java:470)
at org.eclipse.wb.internal.core.editor.DesignPage.internal_refreshGEF_withProgress(DesignPage.java:484)
at org.eclipse.wb.internal.core.editor.DesignPage.internal_refreshGEF(DesignPage.java:432)
at org.eclipse.wb.internal.core.editor.UndoManager.refreshDesignerEditor(UndoManager.java:389)
at org.eclipse.wb.internal.core.editor.UndoManager.activate(UndoManager.java:90)
at org.eclipse.wb.internal.core.editor.DesignPage.handleActiveState_True(DesignPage.java:275)
at org.eclipse.wb.internal.core.editor.DesignPage.handleActiveState(DesignPage.java:252)
at org.eclipse.wb.internal.core.editor.multi.DefaultMultiMode.showPage(DefaultMultiMode.java:127)
at org.eclipse.wb.internal.core.editor.multi.DefaultMultiMode$1.widgetSelected(DefaultMultiMode.java:63)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:252)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4251)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1066)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1090)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1075)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:778)
at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3248)
at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1882)
at org.eclipse.swt.custom.CTabFolder.lambda$0(CTabFolder.java:332)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4251)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1066)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4068)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3645)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1155)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1046)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:643)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:550)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:171)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:152)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:136)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:402)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:577)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:659)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:596)
at org.eclipse.equinox.launcher.Main.run(Main.java:1467)
at org.eclipse.equinox.launcher.Main.main(Main.java:1440)

[wimjongman]

You are not using the correct java subclass. Please try to create a new class from the toolbar. If you think you do, please attach your java source (do not paste it in a comment).

[et1113]

Thank you! That is exactly how I created the class. Attached is my java file. Hoping I'm just missing something.

test.zip

[wimjongman]

This has a class in test.zip, but this is not guiIntro.LabGuiIntro that is in your stack trace.

The test class you have placed in the zip file works fine for me. What OS are you using?

[et1113]

Sorry, I deleted the original file in my post in trying to fix it. I get the same error with the test class, though. My OS is Windows 10 version 21H2

[et1113]

I was able to fix it by adding JavaSE 1.7 to my build path library. Here's the video I followed :) https://youtu.be/xsHLY-jV4AU

[ognjengit]

For me adding JavaSE 1.7 still doesnt work...

[marroukihatem]

Even after installing Window builder components in eclipse, if you get this error, switch to code and insert below code and then switch to design
it work with me same probleme

import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JTextArea;

public class One { // Your class name

public static void main(String[] args) {

  JFrame f = new JFrame("A JFrame");
  f.setSize(250, 250);
  f.setLocation(300,200);
  f.getContentPane().add(BorderLayout.CENTER, new JTextArea(10, 40));
  f.setVisible(true);
  
}

}

[lcaron]

Can you please tell us what version of Eclipse, WindowBuilder and Java do you use ?

[wimjongman]

Even after installing Window builder components in eclipse, if you get this error, switch to code and insert below code and then switch to design it work with me same probleme

import java.awt.BorderLayout; import javax.swing.JFrame; import javax.swing.JTextArea;

public class One { // Your class name

public static void main(String[] args) {

  JFrame f = new JFrame("A JFrame");
  f.setSize(250, 250);
  f.setLocation(300,200);
  f.getContentPane().add(BorderLayout.CENTER, new JTextArea(10, 40));
  f.setVisible(true);
  
}

}

I think that this code will not work in Windowbuilder. You have to extend a GUI class or create one from the wizards.

explorer_i2CAiC85Ma.mp4