Program: 159703
Project: 159703
Buggy source:
private ImagePanel createImagePanelInstance(){
  if (background == null) {
synchronized (ThemePluginImpl.class) {
      if (background == null) {
        String filename="String_Node_Str";
        try {
          if (PreferencesDialog.getCachedValue(PreferencesDialog.KEY_BACKGROUND_IMAGE_DEFAULT,"String_Node_Str").equals("String_Node_Str")) {
            InputStream is=this.getClass().getResourceAsStream(filename);
            if (is == null)             throw new FileNotFoundException("String_Node_Str" + filename + "String_Node_Str");
            background=ImageIO.read(is);
          }
 else           if (PreferencesDialog.getCachedValue(PreferencesDialog.KEY_BACKGROUND_IMAGE,"String_Node_Str") != null) {
            String path=PreferencesDialog.getCachedValue(PreferencesDialog.KEY_BATTLEFIELD_IMAGE,"String_Node_Str");
            if (path != null) {
              background=ImageIO.read(new File(path));
            }
 else {
              InputStream is=this.getClass().getResourceAsStream(filename);
              if (is == null)               throw new FileNotFoundException("String_Node_Str" + filename + "String_Node_Str");
              background=ImageIO.read(is);
            }
          }
          if (background == null)           throw new FileNotFoundException("String_Node_Str" + filename + "String_Node_Str");
        }
 catch (        Exception e) {
          log.error(e.getMessage(),e);
          return null;
        }
      }
    }
  }
  return new ImagePanel(background,ImagePanel.SCALED);
}

Fixed version (ground truth):
private ImagePanel createImagePanelInstance(){
  if (background == null) {
synchronized (ThemePluginImpl.class) {
      if (background == null) {
        String filename="String_Node_Str";
        try {
          if (PreferencesDialog.getCachedValue(PreferencesDialog.KEY_BACKGROUND_IMAGE_DEFAULT,"String_Node_Str").equals("String_Node_Str")) {
            InputStream is=this.getClass().getResourceAsStream(filename);
            if (is == null)             throw new FileNotFoundException("String_Node_Str" + filename + "String_Node_Str");
            background=ImageIO.read(is);
          }
 else {
            String path=PreferencesDialog.getCachedValue(PreferencesDialog.KEY_BACKGROUND_IMAGE,"String_Node_Str");
            if (path != null && !path.equals("String_Node_Str")) {
              try {
                File f=new File(path);
                if (f != null)                 background=ImageIO.read(f);
              }
 catch (              Exception e) {
                background=null;
              }
            }
          }
          if (background == null) {
            InputStream is=this.getClass().getResourceAsStream(filename);
            if (is == null)             throw new FileNotFoundException("String_Node_Str" + filename + "String_Node_Str");
            background=ImageIO.read(is);
          }
          if (background == null)           throw new FileNotFoundException("String_Node_Str" + filename + "String_Node_Str");
        }
 catch (        Exception e) {
          log.error(e.getMessage(),e);
          return null;
        }
      }
    }
  }
  return new ImagePanel(background,ImagePanel.SCALED);
}