AliasToBeanResultTransformer 。问题：Could not find setter for 0 on class MyClass

As you are using AliasToBeanResultTransformer, you have to declare proper alias names in your query, as its name says that it will transform the results into your resultClass using thealias names.

The transformTuple method of AliasToBeanResultTransformer class uses the alias names to find the setter methods of your resultClass (StudentDto):

下面这个就是AliasToBeanResultTransformer类的transformTuple方法：

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public Object transformTuple(Object[] tuple, String[] aliases) {         Object result;         try {             if ( setters == null ) {                 setters = new Setter[aliases.length];                 for ( int i = 0; i < aliases.length; i++ ) {                     String alias = aliases[i];                     if ( alias != null ) {                         setters[i] = propertyAccessor.getSetter( resultClass, alias );                     }                 }             }             result = resultClass.newInstance();             for ( int i = 0; i < aliases.length; i++ ) {                 if ( setters[i] != null ) {                     setters[i].set( result, tuple[i], null );                 }             }         }         catch ( InstantiationException e ) {             throw new HibernateException( "Could not instantiate resultclass: " + resultClass.getName() );         }         catch ( IllegalAccessException e ) {             throw new HibernateException( "Could not instantiate resultclass: " + resultClass.getName() );         }         return result;     }

 

In order to make AliasToBeanResultTransformer work properly you need to use proper alias names in yourquery. If the property name in your StudentDto class is name, you should useselect student.name as name; using select student.name as n will again throw exception. The alias names that you are using in the query should be same as the property names in your DTO class.