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Home » Eclipse Projects » WindowBuilder » WindowBuilder Design view not working on Eclipse Mars (Version 4.5)(windowBuilder throws an Internal Error)
icon5.gif  WindowBuilder Design view not working on Eclipse Mars (Version 4.5) [message #1434617] Tue, 30 September 2014 10:46 Go to next message
Wallace Roets is currently offline Wallace RoetsFriend
Messages: 1
Registered: September 2014
Junior Member
Good day all,

Not sure if I am doing something wrong, but when I create a class via the WindowBuilder and then click on the Design tab, I get the following:
Internal Error
WindowBuilder encountered unexpected internal error.

This could be caused by a WindowBuilder bug or by a misconfiguration issue, conflict, partial update, etc.

org.eclipse.wb.internal.core.utils.check.AssertionFailedException: Version 4.5 is not present in [3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 4.2, 4.3, 4.4]

I allready tried to update (Help > Check for Updates). Is there anything (other than downgrading my Eclipse) I can do to get this to work again?

Thanking you all in advance
Re: WindowBuilder Design view not working on Eclipse Mars (Version 4.5) [message #1445299 is a reply to message #1434617] Wed, 15 October 2014 08:46 Go to previous message
Sébastien GUISSE is currently offline Sébastien GUISSEFriend
Messages: 3
Registered: July 2014
Junior Member

I have resolved this problem with this workarround :
¤ Decompile RcpDescriptionVersionsProviderFactory.class of org.eclipse.wb.rcp_1.7.0.r44x201405021526.jar located in eclipse/plugins/
¤ Do a copy of this jar (before any modification) : org.eclipse.wb.rcp_1.7.0.r44x201405021526.jar.copy
¤ Create an eclipse project and add the decompiled classe to modify and include all needed dependencies
¤ Add 4.5 version to AllVersions List
==> final List allVersions = ImmutableList.of("3.2", "3.3", "3.4", "3.5", "3.6", "3.7", "3.8", "4.2", "4.3", "4.4","4.5");
¤ Compile RcpDescriptionVersionsProviderFactory
¤ Finally modify classes of org.eclipse.wb.rcp_1.7.0.r44x201405021526.jar with Winrar by coping /bin/org/eclipse/wb/internal/rcp/ :
* RcpDescriptionVersionsProviderFactory$MyFromListDescriptionVersionsProvider.class

I have joined the modified jar.

FYI : Here is the modified code :

package org.eclipse.wb.internal.rcp;

import java.util.List;
import java.util.Map;

import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.swt.SWT;
import org.eclipse.wb.internal.core.model.description.resource.FromListDescriptionVersionsProvider;
import org.eclipse.wb.internal.core.model.description.resource.IDescriptionVersionsProvider;
import org.eclipse.wb.internal.core.model.description.resource.IDescriptionVersionsProviderFactory;


public final class [color=blue]RcpDescriptionVersionsProviderFactory [/color]implements IDescriptionVersionsProviderFactory {
	public static final IDescriptionVersionsProviderFactory INSTANCE = new RcpDescriptionVersionsProviderFactory();

	public Map<String, Object> getVersions(final IJavaProject javaProject, final ClassLoader classLoader) throws Exception {
		if (!isRCP(javaProject)) {
			return (Map) ImmutableMap.of();

		final String version = getSWTVersion();
		return (Map) ImmutableMap.of("rcp_version", version);

	public IDescriptionVersionsProvider getProvider(final IJavaProject javaProject, final ClassLoader classLoader) throws Exception {
		if (!isRCP(javaProject)) {
			return null;

		final String version = getSWTVersion();
		final List allVersions = ImmutableList.of("3.2", "3.3", "3.4", "3.5", "3.6", "3.7", "3.8", "4.2", "4.3", "4.4","4.5");
		return new MyFromListDescriptionVersionsProvider(this, allVersions, version);

	private boolean isRCP(final IJavaProject javaProject) throws JavaModelException {
		return javaProject.findType("org.eclipse.swt.custom.CTabFolder") != null;

	private static String getSWTVersion() {
		final int version = SWT.getVersion();
		final int major = version / 1000;
		final int minor = (version - (major * 1000)) / 100;
		return major + "." + minor;

	private class MyFromListDescriptionVersionsProvider extends FromListDescriptionVersionsProvider {
		MyFromListDescriptionVersionsProvider(final RcpDescriptionVersionsProviderFactory paramRcpDescriptionVersionsProviderFactory,
		                                      final List $anonymous0, final String $anonymous1) {
			super($anonymous0, $anonymous1);

		protected boolean validate(final Class<?> componentClass) throws Exception {
			final String className = componentClass.getName();

			return (className.startsWith("org.eclipse.swt.")) || (className.startsWith("org.eclipse.jface."))
			       || (className.startsWith("org.eclipse.ui."));

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