When a new instance of this CreationSupport is created, one must also call setJavaInfo. The result of this oversight can be observed with the following example:
public class MyFrame extends JFrame {
private static final long serialVersionUID = 1L;
private JPanel contentPane;
/**
* Create the frame.
*/
public MyFrame() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
}
}
When adding and immediately removing a JPanel, the editor crashes with the following exception:
org.eclipse.wb.internal.core.utils.check.AssertionFailedException: null argument
at org.eclipse.wb.internal.core.utils.check.Assert.fail(Assert.java:225)
at org.eclipse.wb.internal.core.utils.check.Assert.isNotNull(Assert.java:174)
at org.eclipse.wb.internal.core.utils.check.Assert.isNotNull(Assert.java:159)
at org.eclipse.wb.core.model.ObjectInfo.addChild(ObjectInfo.java:181)
at org.eclipse.wb.core.model.ObjectInfo.addChild(ObjectInfo.java:164)
at org.eclipse.wb.internal.swing.model.layout.ImplicitLayoutCreationSupport$2.childRemoveAfter(ImplicitLayoutCreationSupport.java:59)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at org.eclipse.wb.core.model.broadcast.BroadcastSupport.lambda$0(BroadcastSupport.java:207)
at org.eclipse.wb.core.model.broadcast.ObjectEventListener$ByteBuddy$uhzXxpnH.childRemoveAfter(Unknown Source)
at org.eclipse.wb.core.model.ObjectInfo.removeChild(ObjectInfo.java:248)
at org.eclipse.wb.internal.swing.model.layout.absolute.AbsoluteLayoutCreationSupport.delete(AbsoluteLayoutCreationSupport.java:83)
at org.eclipse.wb.core.model.JavaInfo$7.run(JavaInfo.java:818)
at org.eclipse.wb.internal.core.utils.execution.ExecutionUtils.run(ExecutionUtils.java:331)
at org.eclipse.wb.core.model.JavaInfo.delete(JavaInfo.java:805)
at org.eclipse.wb.internal.core.model.JavaInfoUtils.deleteJavaInfo(JavaInfoUtils.java:2048)
at org.eclipse.wb.internal.core.model.creation.ConstructorCreationSupport.delete(ConstructorCreationSupport.java:418)
at org.eclipse.wb.core.model.JavaInfo$7.run(JavaInfo.java:818)
at org.eclipse.wb.internal.core.utils.execution.ExecutionUtils.run(ExecutionUtils.java:331)
at org.eclipse.wb.core.model.JavaInfo.delete(JavaInfo.java:805)
at org.eclipse.wb.core.model.AbstractComponentInfo.delete(AbstractComponentInfo.java:226)
at org.eclipse.wb.internal.core.editor.actions.DeleteAction$2.executeEdit(DeleteAction.java:123)
at org.eclipse.wb.core.gef.command.EditCommand.lambda$0(EditCommand.java:50)
at org.eclipse.wb.internal.core.utils.execution.ExecutionUtils.run(ExecutionUtils.java:331)
at org.eclipse.wb.core.gef.command.EditCommand.execute(EditCommand.java:50)
...
The following method introduced with https://github.com/eclipse-windowbuilder/windowbuilder/pull/182 creates a partially initialized instance of the ImplicitLayoutCreationSupport:
https://github.com/eclipse-windowbuilder/windowbuilder/blob/a28301b17ac3cfef7c4a3d3adb2533bccae6f123/org.eclipse.wb.swing/src/org/eclipse/wb/internal/swing/model/component/ContainerInfo.java#L626-L650
When a new instance of this CreationSupport is created, one must also call
setJavaInfo. The result of this oversight can be observed with the following example:When adding and immediately removing a JPanel, the editor crashes with the following exception: