java - SWT Composite 构造函数在非空参数上抛出 IllegalArgumentException

Question

这段代码(Scala)

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

抛出异常:

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)

根据documentation ， IllegalArgumentException 仅当父级为 null 时才抛出，但我正在检查这一点。 detailsPane 是一个CTabFolder。为什么会发生这种情况？

Answer 1

给出的解决方案at the Eclipse forums : detailsPane 结果被处置了。