jface databinding Realm cannot be null

 

Realm cannot be null

When I try to add an composite (made by JFace Automatic Databinding, in this case "PeopleDB.java") to an existing Shell-Application (in this case "PersonList.java"), the error-message "Realm cannot be null" appears:

Code: Select all

org.eclipse.core.runtime.AssertionFailedException: null argument:Realm cannot be null
   at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:86)
   at org.eclipse.core.databinding.observable.ChangeManager.(ChangeManager.java:36)
   at org.eclipse.core.databinding.observable.AbstractObservable.(AbstractObservable.java:28)
   at org.eclipse.core.databinding.observable.value.AbstractObservableValue.(AbstractObservableValue.java:42)
   at org.eclipse.core.internal.databinding.beans.JavaBeanObservableValue.(JavaBeanObservableValue.java:63)
   at org.eclipse.core.internal.databinding.beans.JavaBeanObservableValue.(JavaBeanObservableValue.java:52)
   at org.eclipse.core.databinding.beans.BeansObservables.observeValue(BeansObservables.java:89)
   at org.eclipse.core.databinding.beans.BeansObservables.observeValue(BeansObservables.java:69)
   at ch.clicdesign.artistadmin.simpleclient.PeopleDB.initDataBindings(PeopleDB.java:92)
   at ch.clicdesign.artistadmin.simpleclient.PeopleDB.(PeopleDB.java:70)
   at ch.clicdesign.artistadmin.simpleclient.PersonList.createContents(PersonList.java:167)
   at ch.clicdesign.artistadmin.simpleclient.PersonList.open(PersonList.java:62)

I know, there're some workarounds to replace the code made by the Automatic Databinding, but it's not a real solution.
Does anyone have the same problem or a good tip?
Thx!

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Re: Realm cannot be null

The realm needs to be set up when your application starts. Composites will use the realm set up in the parent shell. If you don't have a realm set up in your shell, you need to do so.

The databinding example project provided with SWT Designer shows how to do this, or you can simply refer to the Eclipse Data Binding docs.

 

public static void main(String[] args) {
  Display display = Display.getDefault();
  Realm.runWithDefault(SWTObservables.getRealm(display), new Runnable() {
    public void run() {
     try {
      MainBackFrom window = new MainBackFrom();
      
      window.open();
     } catch (Exception e) {
      e.printStackTrace();
     }
    }
   });

}