问当映射嵌套类时，Mybatis "java.lang.IllegalArgumentException: Result Maps集合已包含值“错误

EN

package com.test;   
public class ObjectA {
  private List<ObjectB> entries;

  public ObjectA(List<ObjectB>  entries) {
    this.entries = entries;
  }

  public void setEntries(List<ObjectB> entries) {
    this.entries = entries;
  }

  public List<ObjectB> getEntries() {
    return this.entries;
  }

  public class ObjectB {
    private String param1;

    public ObjectB(String param1) {
        this.param1 = param1;
    }

    public void setParam1(String param1) {
        this.param1 = param1;
    }

    public String getParam1() {
        return this.param1;
    }

  }
}

<resultMap id="ObjectA" type="com.test.ObjectA">
    <collection property="entries" resultMap="Entries"/>
</resultMap>
<resultMap id="Entries" type="com.test.ObjectA.ObjectB">
    <result property="param1" column="column1"/>
</resultMap>