Bug 49353 Javadoc preference does not indicate bad exe until field is edited. [javadoc]
I upgarded from Sun Java 1.4.2_02 to 1.4.2_03. When I open the Javadoc preference page, the entry fields shows "C:\Java\sun\1.4.2_02\bin\javadoc.exe", which no longer exists but the error icon and message is NOT displayed at the top of the pane. If I edit the field but leave the entry still bogus, THEN the error icon and message appear. I think the error should appear as soon as the pane is displayed. Version 3.0.m6.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javadocexport/JavadocTreeWizardPage.java
private boolean validDocletPath(String docletPath) {
		StringTokenizer tokens= new StringTokenizer(docletPath, ";"); 
		while (tokens.hasMoreTokens()) {
			File file= new File(tokens.nextToken());
			if (!file.exists())
				return false;
		}
		return true;
	}
	/**
	 * Finds the most severe error (if there is one)
	 */
	private IStatus findMostSevereStatus() {
		return StatusUtil.getMostSevere(new IStatus[] { fJavadocStatus, fPreferenceStatus, fDestinationStatus, fDocletStatus, fTreeStatus, fWizardStatus });
	}
	public void init() {
		updateStatus(new StatusInfo());
	}
	public void setVisible(boolean visible) {
		super.setVisible(visible);
		if (visible) {
			doValidation(JAVADOCSTATUS);
			doValidation(STANDARDSTATUS);
			doValidation(CUSTOMSTATUS);
			doValidation(TREESTATUS);
			doValidation(PREFERENCESTATUS);
		}
	}
}