Question

我将json反序列化为ArrayList

时出现此错误

12-31 05:29:10.963: W/System.err(2939): org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of java.util.ArrayList out of VALUE_TRUE token

这里是json的结构：

{
"c_Evenement" : [{
        "id" : {
            "o_id" : 9,
            "t_id" : 1,
            "key" : "1_9"
        },
        "bla1" : "bla bla bla bla",
        "bla2" : "bla bla bla bla",
        "bla3" : "bla bla bla bla",
        "bla4" : "bla bla bla bla"
    }
],
"themes" : [{
        "id" : 1,
        "nom" : "Administration"
    }
    ],
"c_Theme" : [{
        "id" : {
            "couche_id" : 761,
            "theme_id" : 1,
            "key" : "1_761"
        },
        "layerId" : 0
    }
],
"message" : null,
"ok" : true
}

这里是LireTheme课程：

@JsonIgnoreProperties(ignoreUnknown=true)
public class LireTheme {

private Themes themes;
private CouchesTheme c_Theme;
private ClassesEvenement c_Evenement;

private String message;
private boolean ok;

//getters and setters

}

这里的LireTheme类只是一个映射HashMap：

public class LireThemes extends HashMap<String, ArrayList<LireTheme>> {
    private static final long serialVersionUID = 1L;
}

以及我如何反序化它：

LireThemes lirethemes = null;
ArrayList<LireTheme> themeList = null;
final InputStream stream = context.getAssets().open("lireThemes.json");
lirethemes = objectMapper.readValue(stream, LireThemes.class);
themeList = lirethemes.get("themes");

我真的需要帮助。

Answer 1

是的，现在我可以看到这些属性中的每一个都是集合，而不是简单的属性。因此，对于每一个，杰克逊都试图映射到列表，例如。所以，试试：

@JsonIgnoreProperties(ignoreUnknown=true)
public class LireTheme {

private List<Themes> themes;
private List<CouchesTheme> c_Theme;
private List<ClassesEvenement> c_Evenement;

private String message;
private boolean ok;

//getters and setters

}

希望这有帮助！

Jackson：无法从VALUE_TRUE标记中反序列化java.util.ArrayList的实例

1 个答案: