Program: 152158
Project: 152158
Buggy source:
public static void setLaF() throws Exception {
  Config config=PersistenceManager.getConfig();
  String laf=config.getLookAndFeel();
  JFrame.setDefaultLookAndFeelDecorated(config.isLafWindowDecorated());
  JDialog.setDefaultLookAndFeelDecorated(config.isLafWindowDecorated());
  if (laf.equals(LAF_SYSTEM)) {
    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
  }
 else   if (laf.equals(LAF_CROSSPLATFORM)) {
    UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
  }
 else   if (laf.equals(LAF_GTK)) {
    UIManager.setLookAndFeel(GTKLookAndFeel.class.getName());
  }
 else   if (laf.equals(LAF_JGOODIES)) {
    String themeString=config.getLafJGoodiesTheme();
    PlasticTheme theme=null;
    for (    Object o : PlasticLookAndFeel.getInstalledThemes()) {
      PlasticTheme ptheme=(PlasticTheme)o;
      if (ptheme.getName().equals(themeString)) {
        theme=ptheme;
        break;
      }
    }
    PlasticLookAndFeel.setPlasticTheme(theme != null ? theme : new ExperienceBlue());
    UIManager.setLookAndFeel(new PlasticXPLookAndFeel());
  }
 else   if (laf.equals(LAF_SUBSTANCE)) {
    String skinString=config.getLafSubstanceSkin();
    String skin=null;
    new SubstanceLookAndFeel();
    for (    SkinInfo skinInfo : SubstanceLookAndFeel.getAllSkins().values()) {
      if (skinInfo.getDisplayName().equals(skinString)) {
        skin=skinInfo.getClassName();
        break;
      }
    }
    SubstanceLookAndFeel.setSkin(skin != null ? skin : new SaharaSkin().getClass().getName());
    UIManager.setLookAndFeel(new SubstanceLookAndFeel());
  }
 else {
    throw new IllegalArgumentException("String_Node_Str");
  }
}

Fixed version (ground truth):
public static void setLaF() throws Throwable {
  Config config=PersistenceManager.getConfig();
  String laf=config.getLookAndFeel();
  JFrame.setDefaultLookAndFeelDecorated(config.isLafWindowDecorated());
  JDialog.setDefaultLookAndFeelDecorated(config.isLafWindowDecorated());
  if (laf.equals(LAF_SYSTEM)) {
    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
  }
 else   if (laf.equals(LAF_CROSSPLATFORM)) {
    UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
  }
 else   if (laf.equals(LAF_GTK)) {
    UIManager.setLookAndFeel(GTKLookAndFeel.class.getName());
  }
 else   if (laf.equals(LAF_JGOODIES)) {
    String themeString=config.getLafJGoodiesTheme();
    PlasticTheme theme=null;
    for (    Object o : PlasticLookAndFeel.getInstalledThemes()) {
      PlasticTheme ptheme=(PlasticTheme)o;
      if (ptheme.getName().equals(themeString)) {
        theme=ptheme;
        break;
      }
    }
    PlasticLookAndFeel.setPlasticTheme(theme != null ? theme : new ExperienceBlue());
    UIManager.setLookAndFeel(new PlasticXPLookAndFeel());
  }
 else   if (laf.equals(LAF_SUBSTANCE)) {
    String skinString=config.getLafSubstanceSkin();
    String skin=null;
    new SubstanceLookAndFeel();
    for (    SkinInfo skinInfo : SubstanceLookAndFeel.getAllSkins().values()) {
      if (skinInfo.getDisplayName().equals(skinString)) {
        skin=skinInfo.getClassName();
        break;
      }
    }
    SubstanceLookAndFeel.setSkin(skin != null ? skin : new SaharaSkin().getClass().getName());
    UIManager.setLookAndFeel(new SubstanceLookAndFeel());
  }
 else {
    throw new IllegalArgumentException("String_Node_Str");
  }
}