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Composite consructor throws IllegalArgumentException on a non-null argument [message #534115]

Tue, 18 May 2010 07:03

Alexey Romanov

Messages: 263
Registered: May 2010

Senior Member

This piece of code (in Scala)

val contents = {
  assert(mainWindow.detailsPane != null)
  new Composite(mainWindow.detailsPane, SWT.NONE)
}

throws an exception:

Exception occurred
java.lang.IllegalArgumentException: Argument not valid
    at org.eclipse.swt.SWT.error(Unknown Source)
    at org.eclipse.swt.SWT.error(Unknown Source)
    at org.eclipse.swt.SWT.error(Unknown Source)
    at org.eclipse.swt.widgets.Widget.error(Unknown Source)
    at org.eclipse.swt.widgets.Widget.checkParent(Unknown Source)
    at org.eclipse.swt.widgets.Widget.<init>(Unknown Source)
    at org.eclipse.swt.widgets.Control.<init>(Unknown Source)
    at org.eclipse.swt.widgets.Scrollable.<init>(Unknown Source)
    at org.eclipse.swt.widgets.Composite.<init>(Unknown Source)
    at main.scala.NodeViewPresenter$NodeViewImpl.<init>(NodeViewPresenter.scala:41)

According to the documentation, IllegalArgumentException should only be thrown when the parent is null, but I am checking for that. detailsPane is a CTabFolder. (As I understand from examples, the controls I want to set as contents of CTabItem should be children of the CTabFolder.) Can anybody say why this could happen?

[Updated on: Tue, 18 May 2010 07:09]

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