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I try to use the Eclipse Oxygen v4.7.3a (Oxygen) Java IDE.

I try to use window builder to build a GUI application with Java, but when I try to add the window I have an error message.

I tried to google it, but I cannot even know what that message needs from me.

It says:

problem opening wizard

The selected wizard could not be started.
Plug-in org.eclipse.wb.swing was unable to load class org.eclipse.wb.internal.swing.wizards.application.NewSwingApplicationWizard.
An error occurred while automatically activating bundle org.eclipse.wb.core.java (528).

My java -version output:

OpenJDK version "10" 2018-03-20
OpenJDK Runtime Environment (build 10+46-Ubuntu-5ubuntu1)
OpenJDK 64-Bit Server VM (build 10+46-Ubuntu-5ubuntu1, mixed mode)
Peter Mortensen
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1 Answers1

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I had exactly the same error occur in Eclipse Oxygen.3a on my Mac with Java JDK 10 installed. There is code in WindowBuilder 1.9 that uses a Java feature that was either altered or dropped in Java 10. I was able to resolve the problem by making two changes (they assume that a Java 9 JDK is available on your system; if not, you must install it):

  • change the Java VM for Eclipse to one in a Java 9 JDK (using the -vm setting in eclipse.ini; see this link for a good post on how to do that)
  • change the JRE for the project to a Java 9 JRE

The first change is the more important one since Window Builder is a development aid running as part of Eclipse.

I made the project JRE change for my own sanity so I didn't have a mix of Java versions. You may be able to skip that change (I didn't try it).

I still have Java 10 as the default for the system, so you don't have to completely fall back to Java 9 if you install both JDKs. It may take some tweaking to get both Java 9 and 10 installed and have the one you prefer working as the system default.

TyW
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