public boolean getBoolean(String key, Filter filter) { Boolean value = getBoolean(key, filter, null); assertNotNull(key, value); return value.booleanValue();
public boolean getBoolean(String key) { return properties.getBoolean(key);
    public boolean getBoolean(String key, Filter filter) {        Boolean value = getBoolean(key, filter, null);                assertNotNull(key, value);        return value.booleanValue();    }