Mybatis do not find the correct handler for a class

[marnavleo]

MyBatis version

3.4.4

Situation
One generic handler for several java classes:
@MappedTypes({ FirtsClass,.., LastClass, ... 57 classes})
public class ConstantTranslationHandler<E extends Enum & HasValue> extends BaseTypeHandler {
...
}

Just one handler declared in ibatis-config

Result

• 57 handlers are created when the application is started
• When the resultmap is obtained, the handler is called correctly, but the wrong handler!!!
• I debugged and i realized that there was one handler per each class but the TypeHandlerRegistry always return the last instanced handler .

[harawata]

Hi @marnavleo ,

Does the ConstantTranslationHandler have a proper constructor?
There are some concrete examples in the comments on #42 .

If you create a small example project like these and upload it to your GitHub repo, I will look into it.

[marnavleo]

It has a constructor that receives one parameter: the type of the enum that calls the handler.

Enum

@XmlType(name = "claves_cargo")
@XmlEnum
public enum ClavesCargo implements HasValue  {
    AR,
    CN;
    public String value() {
        return name();
    }
    public static ClavesCargo fromValue(String v) {
        return valueOf(v);
    }
}

Interface

public interface HasValue {
	public String value() ;
}

Handler

@MappedTypes({ ClavesCargo.class, ClavesZona.class })
public class ConstantTranslationHandler<E extends Enum<E> & HasValue> extends BaseTypeHandler<E> {
       //Patch to inyect spring bean
	private ClavesSingleton clavesSingleton = null;
	private ClavesSingleton getClavesSingleton() {
		if(clavesSingleton==null){
			this.clavesSingleton=(ClavesSingleton) 
                                     ParcheIbatisSpring.getBean(ClavesSingleton.class);
		}
		return clavesSingleton;
	}

	private Class<E> type;
	private final E[] enums;
        //Constructor
	_public ConstantTranslationHandler(Class<E> type) {
	    if (type == null)
	      throw new IllegalArgumentException("Type argument cannot be null");
	    this.type = type;
	    this.enums = type.getEnumConstants();
	    if (this.enums == null)
	      throw new IllegalArgumentException(type.getSimpleName()
	          + " does not represent an enum type.");
	  }_
	@Override
	public void setNonNullParameter(PreparedStatement ps, int i, E parameter, JdbcType jdbcType) throws SQLException {
		ps.setString(i, parameter.value());
	}

	@SuppressWarnings("unchecked")
	@Override
	public E getNullableResult(ResultSet rs, String columna) throws SQLException {
		String dato = rs.getString(columna);
		ClavesC clave = getClavesSingleton().getClaveBy(KeyEnumDictionary.getClave(type), dato);
		E output = null;		
		if(clave!=null){
			output =(E) EnumFactory.getInstanceOf(type, clave.getClaveEIAC());
		}
		return output;
	}

	@Override
	public E getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
		return null;
	}

	@Override
	public E getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
		return null;
	}

Mybatis-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
	<typeHandlers>
		<typeHandler handler="xxx.xxx.handler.ConstantTranslationHandler" "/>
	</typeHandlers>
</configuration>

The ibatis mapper

<resultMap type="xxx.xxx.Cargo" id="Cargo">
	<result column="numeroOrden" property="numeroOrden" javaType="java.lang.Long"/>
	<result column="claseCargo" property="claseCargo" javaType="xxx.xxx.ClavesCargo" typeHandler="aegon.aegon.vida.eiac.generacion.handler.ConstantTranslationHandler"/>
	<result column="importe" property="importe" javaType="java.math.BigDecimal"/>
	<result column="descripcionCargo" property="descripcionCargo" javaType="java.lang.String"/>
</resultMap>

[harawata]

OK, then please create a small example project like these and upload it to your GitHub repo.
Thanks!

[ljz0721cx]

I have same problems as marnavleo,But I user a object,if not support?

public class EnDecryptHandler<E extends SecurityDTO & SecurityKey> extends BaseTypeHandler<SecurityKey> {
    private static Logger logger = LoggerFactory.getLogger(EnDecryptHandler.class);
   
    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, SecurityKey parameter, JdbcType jdbcType)
            throws SQLException {
        ps.setString(i, "str");
    }

[ljz0721cx]

Sorry，I've already solved it

[harawata]

This may be the same issue as #995 .