#fixed code
                             @Override
	public SymbolReference<MethodDeclaration> solveMethod(String name, List<Type> parameterTypes) {
        Context ctx = getContext();
		return ctx.solveMethod(name, parameterTypes, typeSolver);
	}
#vulnerable code 
                             @Override
	public SymbolReference<MethodDeclaration> solveMethod(String name, List<Type> parameterTypes) {
		return getContext().solveMethod(name, parameterTypes, typeSolver());
	} 
                            #location 3 
                            #vulnerability type NULL_DEREFERENCE