SonarLint V3:“Serializable"中的字段；对于 List 接口，类应该是瞬态的或可序列化的

2022-01-17 00:00:00 sonarqube intellij-idea java sonarlint

我的问题与 this 非常相似 除了我在 SonarLint V3 (squid:S1948) 中遇到的这个问题.

My question is very similar to this except that this issue I have encountered in SonarLint V3 (squid:S1948).

我的代码是:

public class Page<T> implements Serializable {

    Summary summary;
    List<T> elements;

    public Page() {
        summary = new Summary();
    }

    public List<T> getItemsReceived() {
        return elements;
    }

    public void setItemsReceived(List<T> list) {
        this.elements = list;
    }

    public Summary getSummary() {
        return summary;
    }

    public void setSummary(Summary summary) {
        this.summary = summary;
    }

}

摘要对象实现可序列化.

The Summary Object implements serializable.

public class Summary implements Serializable {

    int offset;
    int limit;
    long totalElements;

    public int getOffset() {
        return offset;
    }

    public void setOffset(int offset) {
        this.offset = offset;
    }

    public int getLimit() {
        return limit;
    }

    public void setLimit(int limit) {
        this.limit = limit;
    }

    public long getTotalNumberOfElements() {
        return totalElements;
    }

    public void setTotalNumberOfElements(long totalNumberOfElements) {
        this.totalElements = totalNumberOfElements;

    }

}

现在，如果我将 List 替换为 ArrayList ，那么 SonarLint 中会出现另一个警告，即我们应该使用接口而不是实现类.

Now, If I replace List by ArrayList , then another warning in SonarLint arises that we should be using interface instead of implementation classes.

我认为这可能会在 SonarQube 中解决，但对于 SonarLint 我不知道.这是一个错误还是我做错了什么?

I think this might be resolved in SonarQube but for SonarLint I don't know. Is this a bug or am I doing something wrong ?

推荐答案

SonarLint 是对的.问题是不能保证 elements 字段是可序列化的.您需要像这样在 T 类型上添加类型绑定

SonarLint is right. The problem is that there is no guarantee that elements field is serializable. You need to add type bound on T type like this 

public class Page<T extends Serializable> implements Serializable {}

这样，如果为列表选择的实现是可序列化的(Java 中的标准集合类型也是如此)，则列表将是可序列化的.

This way the list will be serializable if implementation chosen for it is serializable (which is true for standard collection types in Java).

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