private void validate() {

		String message = null;
		String projectName = projectCombo.getText();
		
		if (projectName.isEmpty()) {
			message = "Existing Java project must be specified";
		}

		setErrorMessage(message);
		setPageComplete(message == null);
	}
Validates the fields on the page and updates the page's status.
Should be called every time a field on the page changes.
GhidraBuild/EclipsePlugins/GhidraDev/GhidraDevPlugin/src/main/java/ghidradev/ghidraprojectcreator/wizards/pages/ChooseJavaProjectWizardPage.java