Bug 5571 JAR Packager: Reveal first checked project
If the list of projects in the JAR Packager is long it is possible that the shown projects are not checked even though there are checked projects (due to current selection). ==> reveal the first checked project.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/jarpackager/JarPackageWizardPage.java
if (fJarPackage.getJarLocation().toString().endsWith("/")) { 
			setErrorMessage(JarPackagerMessages.getString("JarPackageWizardPage.error.exportDestinationMustNotBeDirectory")); 
			fDestinationNamesCombo.setFocus();
			return false;
		}
		return ensureTargetFileIsValid(fJarPackage.getJarLocation().toFile());
	}
	/*
	 * Overrides method from WizardDataTransferPage
	 */
	protected boolean validateOptionsGroup() {
		return true;
	}
	/*
	 * Overrides method from WizardDataTransferPage
	 */
	protected boolean validateSourceGroup() {
		if (!fExportClassFilesCheckbox.getSelection()
				&& !fExportJavaFilesCheckbox.getSelection()) {
			setErrorMessage(JarPackagerMessages.getString("JarPackageWizardPage.error.noExportTypeChecked")); 
			return false;
		}
		if (getSelectedResources().size() == 0) 
			return false;
		
		if (fExportClassFilesCheckbox.getSelection() || !fExportJavaFilesCheckbox.getSelection())
			return true;
			
		
		Iterator iter= getSelectedResourcesIterator();