Bug 91072 F2/Hover for external javadoc does not work
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/JavadocConfigurationBlock.java
in2= packagelistURL.openConnection().getInputStream();
				if (MessageDialog.openConfirm(fShell, fTitle, fValidMessage))
					spawnInBrowser(indexURL);
			} catch (IOException e) {
				MessageDialog.openWarning(fShell, fTitle, fInvalidMessage);
			} finally {
				if (in1 != null) { try { in1.close(); } catch (IOException e) {} }
				if (in2 != null) { try { in2.close(); } catch (IOException e) {} }
			}				
		}
	}
	
	private class JDocConfigurationAdapter implements IDialogFieldListener {
		
		public void dialogFieldChanged(DialogField field) {
			jdocDialogFieldChanged(field);
		}
	}
	private void jdocDialogFieldChanged(DialogField field) {
		if (field == fURLField) {
			fURLStatus= updateURLStatus();
			statusChanged();
		} else if (field == fArchiveField) {
			fArchiveStatus= updateArchiveStatus();
			statusChanged();
		} else if (field == fArchivePathField) {
			fArchivePathStatus= updateArchivePathStatus();
			statusChanged();
		} else if (field == fValidateURLButton || field == fValidateArchiveButton) {
			EntryValidator validator= new EntryValidator();