java.lang.RuntimeException : Unable to invoke no-args constructor for class DBExecuter. Queryjson$valIOConfigclass

Question

我正在使用 gson 的 fromjson 方法解析 json 字符串，当我将解析器作为独立的 java 应用程序运行时，它可以工作，但是当我从 EAR 运行它时，我收到此错误:

java.lang.RuntimeException:无法调用类 DBExecuter.Queryjson$valIOConfigclass 的无参数构造函数。向 Gson 注册此类型的 InstanceCreator 可能会解决此问题。

感谢有关此问题的任何帮助

json:

{
"code": "code1",
"query": "text",
"type": "10",
"_condqflg": "1",
"_pkgvarflg": "0",
"_IOSerial": "1|2|5",
"_ioConfig": [{
        "_iosl": "1",
        "_iokey": "text",
        "_iotype": "I",
        "_ioflag": "I"
    },
    {
        "_iosl": "2",
        "_iokey": "text",
        "_iotype": "V",
        "_ioflag": "I"
    },
    {
        "_iosl": "3",
        "_iokey": "text",
        "_iotype": "I",
        "_ioflag": "I"
    },
    {
        "_iosl": "4",
        "_iokey": "CLIENT_NUM",
        "_iotype": "I",
        "_ioflag": "1"
    }

],
"_valcfg": [{
        "_cfgsl": "1",
        "_cfgstr": "text",
        "_cfgioSl": "4"
    },
    {
        "_cfgsl": "2",
        "_cfgstr": "text",
        "_cfgioSl": "3|1"
    }
]
},
{
"code": "code2",
"query": "text",
"type": "10",
"_condqflg": "1",
"_pkgvarflg": "0",
"_IOSerial": "1|2|5",
"_ioConfig": [{
        "_iosl": "1",
        "_iokey": "text",
        "_iotype": "I",
        "_ioflag": "I"
    },
    {
        "_iosl": "2",
        "_iokey": "text",
        "_iotype": "V",
        "_ioflag": "I"
    },
    {
        "_iosl": "3",
        "_iokey": "text",
        "_iotype": "I",
        "_ioflag": "I"
    },
    {
        "_iosl": "4",
        "_iokey": "CLIENT_NUM",
        "_iotype": "I",
        "_ioflag": "1"
    }
],
"_valcfg": [{
        "_cfgsl": "1",
        "_cfgstr": "text",
        "_cfgioSl": "4"
    },
    {
        "_cfgsl": "2",
        "_cfgstr": "text",
        "_cfgioSl": "3|1"
    }
]
}

解析器类:

public class JSONparser extends DBImplementManager {

    ArrayList<Queryjson> jsonParseResult = new ArrayList<Queryjson>();
    HashMap<String, Queryjson> _querymap = new HashMap<>();

    public LinkedHashMap<String,Queryjson> _pgmValmap =new LinkedHashMap<String,Queryjson>();


    private JSONparser()
    {
        //load(pgmid);
    }

    private static JSONparser instance;

    public static JSONparser getInstance()
    {
        if(instance==null)
        {
            synchronized(JSONparser.class){
                if(instance==null)
                {
                    instance=new JSONparser();
                }
            }
        }
        return instance;
    }
    public void load(String pgmid, String modid)
    {
        try {
             InputStream input = Thread.currentThread()
                        .getContextClassLoader().getResourceAsStream(path);
             Reader reader = new InputStreamReader(input, "UTF-8");
             jsonParseResult = new Gson().fromJson(reader, new TypeToken<List<Queryjson>>(){}.getType());

            System.out.println("json loading begin");
            if (jsonParseResult != null ) {
                for (Queryjson _query : jsonParseResult) {
                    _querymap.put(_query.getCode(), _query);
                    _pgmValmap.put(pgmid+"_"+_query.getCode(), _query);
                    System.out.println("Result: " + _query.getCode());

                   // _query.loadmaps();

                }
            }
            System.out.println("json loading done");
        } catch (Exception e) {
            e.printStackTrace();
        }


    }
}

pojo 类:公共(public)类 Queryjson {

public Queryjson(){

}
private String code;
private String query;
private String type;
private String _condqflg;
private String _pkgvarflg;
private String _IOSerial;
private valIOConfigclass[] _ioConfig;
private valCFGclass[] _valcfg;

public String getCode() {
    return code;
}
public void setCode(String code) {
    this.code = code;
}
public String getQuery() {
    return query;
}
public void setQuery(String query) {
    this.query = query;
}
public String getType() {
    return type;
}
public void setType(String type) {
    this.type = type;
}
public String getcondqflg() {
    return _condqflg;
}
public void setcondqflg(String _condqflg) {
    this._condqflg = _condqflg;
}
public String getpkgvarflg() {
    return _pkgvarflg;
}
public void setpkgvarflg(String _pkgvarflg) {
    this._pkgvarflg = _pkgvarflg;
}
public String get_IOSerial() {
    return _IOSerial;
}
public void set_IOSerial(String _IOSerial) {
    this._IOSerial = _IOSerial;
}
public valIOConfigclass[] get_ioConfig() {
    return _ioConfig;
}
public void set_ioConfig(valIOConfigclass[] _ioConfig) {
    this._ioConfig = _ioConfig;
}

public valCFGclass[] get_valcfg() {
    return _valcfg;
}
public void set_valcfg(valCFGclass[] _valcfg) {
    this._valcfg = _valcfg;
}

public class valIOConfigclass {
    private String _iosl;
    private String _iokey;
    private String _iotype;
    private String _ioflag;

    public valIOConfigclass()
    {

    }
    public String get_iosl() {
        return _iosl;
    }
    public void set_iosl(String _iosl) {
        this._iosl = _iosl;
    }
    public String get_iokey() {
        return _iokey;
    }
    public void set_iokey(String _iokey) {
        this._iokey = _iokey;
    }
    public String get_iotype() {
        return _iotype;
    }
    public void set_iotype(String _iotype) {
        this._iotype = _iotype;
    }
    public String get_ioflag() {
        return _ioflag;
    }
    public void set_ioflag(String _ioflag) {
        this._ioflag = _ioflag;
    }
}
public class valCFGclass{
    private String _cfgsl;
    private String _cfgstr;
    private String _cfgioSl;

    public valCFGclass(){

    }
    public String get_cfgsl() {
        return _cfgsl;
    }
    public void set_cfgsl(String _cfgsl) {
        this._cfgsl = _cfgsl;
    }
    public String get_cfgstr() {
        return _cfgstr;
    }
    public void set_cfgstr(String _cfgstr) {
        this._cfgstr = _cfgstr;
    }
    public String get_cfgioSl() {
        return _cfgioSl;
    }
    public void set_cfgioSl(String _cfgioSl) {
        this._cfgioSl = _cfgioSl;
    }

}   

}

Answer 1

将您的内部类(valIOConfigclass 和 valCFGclass)标记为 static