question: private void readObject ( ObjectInputStream s ) throws IOException , ClassNotFoundException { s . defaultReadObject ( ) ; if ( name == null ) { if ( types != null ) { throw new InvalidObjectException ( "cannot have types with null name" ) ; } } else { try { check ( ) ; } catch ( RuntimeException e ) { rethrow ( e ) ; } } if ( constraints != null && constraints . isEmpty ( ) ) { throw new InvalidObjectException ( "constraints cannot be empty" ) ; } }
target:  Verifies that the method name, parameter types, and constraints are valid.