#vulnerable code 
                                @SuppressWarnings("unchecked")
    private Object getMapArg(ManagedMap<XmlManagedNode, XmlManagedNode> values, Class<?> setterParamType) {
        Map<Object, Object> m = null;
        if (VerifyUtils.isNotEmpty(values.getTypeName())) {
            try {
                m = (Map<Object, Object>) XmlApplicationContext.class.getClassLoader()
                        .loadClass(values.getTypeName())
                        .newInstance();
            } catch (Throwable t) {
                log.error("map inject error", t);
            }
        } else {
            m = (setterParamType == null ? new HashMap<>() : ConvertUtils.getMapObj(setterParamType));
            log.debug("map ret [{}]", m.getClass().getName());
        }
        for (XmlManagedNode o : values.keySet()) {
            Object k = getInjectArg(o, null);
            Object v = getInjectArg(values.get(o), null);
            m.put(k, v);
        }
        return m;
    } 
                            #location 14 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @SuppressWarnings("unchecked")
    private Object getMapArg(ManagedMap<XmlManagedNode, XmlManagedNode> values, Class<?> setterParamType) {
        Map<Object, Object> m = null;
        if (VerifyUtils.isNotEmpty(values.getTypeName())) {
            try {
                m = (Map<Object, Object>) XmlApplicationContext.class.getClassLoader()
                                                                     .loadClass(values.getTypeName())
                                                                     .newInstance();
            } catch (Throwable t) {
                log.error("map inject error", t);
            }
        } else {
            m = (setterParamType == null ? new HashMap<>() : ConvertUtils.getMapObj(setterParamType));
            if (m != null && log.isDebugEnabled()) {
                log.debug("map ret [{}]", m.getClass().getName());
            }
        }

        if (m != null) {
            for (XmlManagedNode o : values.keySet()) {
                Object k = getInjectArg(o, null);
                Object v = getInjectArg(values.get(o), null);
                m.put(k, v);
            }
        }
        return m;
    }