Question

我想将JfreeChart 1.0.9更新为1.0.19。在我的应用程序中，我通过zip中的序列化保存一些对象并加载它我再次反序列化它。（简单）现在，当我将JFreeChart更新为新版本时，JfreeChart的DataRange类会给我带来麻烦。

我收到此错误：

public class DateRange extends Range implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -4705682568375418157L;

    /** The lower bound for the range. */
    private Date lowerDate;

    /** The upper bound for the range. */
    private Date upperDate;
...

我分析了DateRange的类，并找到了问题。

DateRange.java 1.0.9：

public class DateRange extends Range implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -4705682568375418157L;

    /** The lower bound for the range. */
    private long lowerDate;

    /** The upper bound for the range. */
    private long upperDate;
...

DateRange.java 1.0.19：

private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException{
}

你应该看到问题所在。 lowerDate和upperDate字段的类型从java.util.Date更改为long。现在我无法再次反序列化现有项目。（对于新项目来说这不是问题）

你有解决方法如何解决它？

我唯一要解决的问题是修改源代码并将以下方法添加到此处解释的DateRange.java中：Serialization

#skip-external-locking 
#bind-address       = 127.0.0.0

但我不想在可能的情况下修改jfreechart。

Answer 1

I solved it myself. I changed the DateRange.java and modify the type of lowerDate and upperDate from long to Date. (it's not very nice solution)

With the readObject it didn't work because I get an EOFException when I deserialize the other objects.

When somebody have a better solution I would like to hear it.

改变类型的Libary类的反序列化

1 个答案: