jodd-json/src/main/java/jodd/json/JsonObject.java
public Boolean getBoolean(final String key, final Boolean def) {
		Boolean val = getBoolean(key);

		if (val == null) {
			if (map.containsKey(key)) {
				return null;
			}
			return def;
		}

		return val;
	}
public Boolean getBoolean(final String key, final Boolean def) {
		Boolean val = getBoolean(key);

		if (val == null) {
			if (map.containsKey(key)) {
				return null;
			}
			return def;
		}

		return val;
	}
public Boolean getBoolean ( final String key , final Boolean def ) { Boolean val = getBoolean ( key ) ; if ( val == null ) { if ( map . containsKey ( key ) ) { return null ; } return def ; } return val ; }
Like {@link #getBoolean(String)} but specifies a default value to return if there is no entry.
Like {