@XmlElement(required = false)
private List<String> list;

public List<String> getList() { return list; }

public List<String> getList() {
    if (list == null) {
        list = new ArrayList<String>();
    }
    return list;
}

解决方法

@XmlElement(required = false)
private List<String> list = new ArrayList<String>();

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