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Components and Pallete are empty [message #1840181]

Thu, 08 April 2021 08:35

Jerzy Kaczorek

Messages: 2
Registered: April 2021
Location: Polska

Junior Member

Hello Everybody!

After months I've opened Eclipse to work on old swing projects and I've got a sight of my IDE with broken design view. In the meantime I uninstelled some old jdks - it could be a reason however WindowBuilder doesn't work now in any old or new project.
Yes, installing new eclipse environment and installing and running WindowBuilder causes the same problem. Logs are fullfilled with erros I do not understand so I'm conpletely confused.

Could anyone help me?
Thank you in advance.

example log fragment:

!ENTRY org.eclipse.ui 4 0 2021-04-08 10:27:23.837
!MESSAGE Unhandled event loop exception
!STACK 0
java.lang.NullPointerException: Cannot invoke "org.eclipse.jface.viewers.ISelectionProvider.addSelectionChangedListener(org.eclipse.jface.viewers.ISelectionChangedListener)" because "this.m_selectionProvider" is null
at org.eclipse.wb.internal.core.editor.UndoManager.addSelectionListener(UndoManager.java:187)
at org.eclipse.wb.internal.core.editor.UndoManager.refreshDesignerEditor(UndoManager.java:382)
at org.eclipse.wb.internal.core.editor.UndoManager.activate(UndoManager.java:90)
at org.eclipse.wb.internal.core.editor.DesignPage.handleActiveState_True(DesignPage.java:263)
at org.eclipse.wb.internal.core.editor.DesignPage.handleActiveState(DesignPage.java:241)
at org.eclipse.wb.internal.core.editor.multi.DefaultMultiMode.showPage(DefaultMultiMode.java:125)
at org.eclipse.wb.internal.core.editor.multi.DefaultMultiMode$1.widgetSelected(DefaultMultiMode.java:63)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:252)

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Re: Components and Pallete are empty [message #1840206 is a reply to message #1840181]

Thu, 08 April 2021 15:46

Jerzy Kaczorek

Messages: 2
Registered: April 2021
Location: Polska

Junior Member

Solved:

So I reply to myself:
I re-installed removed jdks and set compiler compliance level to earlier version - so now it works. However it is sad, that the new Java versions have problems with older environments.

If someone knows how to force jdk 16 to work with older projects based on WindowBuilder, I will be grateful to her/him.

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