I had a similar issue where few UI elements were displaying in tiny fonts. I have printed all the keys using below code and updated the specific elements
for (Iterator i = UIManager.getLookAndFeelDefaults().keySet().iterator(); i.hasNext();) {
String key = new String();
Object tmpKey = i.next();
if (tmpKey instanceof StringBuffer) {
StringBuffer s = (StringBuffer) tmpKey;
key = s.toString();
} else {
key = (String) tmpKey;
}
//Print all the keys available in UI manager
System.out.println("Key: " + key);
if (key.endsWith("TabbedPane.font")) {
Font font = UIManager.getFont(key);
Font biggerFont = font.deriveFont(2* font.getSize2D());
// change ui default to bigger font
UIManager.put(key, biggerFont);
}else if(key.endsWith("Tree.rowHeight")){
int rowHeight = UIManager.getInt(key);
int bigRowHeight = 2*rowHeight;
UIManager.put(key, bigRowHeight);
}
}