How to Pass Java List of Objects to Oracle Stored Procedure Using MyBatis?

I can't tell if you do already or not, but you'll need Oracle objects defined.

CREATE OR REPLACE TYPE SCHEMA."YOUR_OBJECT" AS OBJECT
(
    field_one    varchar2(50),
    field_two    varchar2(100)
);
/
CREATE OR REPLACE TYPE SCHEMA."YOUR_OBJECT_ARRAY" AS TABLE OF YOUR_OBJECT;
/

Then you can write type handlers to map the Java objects to the Oracle objects.

import oracle.sql.ARRAY;
import oracle.sql.ArrayDescriptor;
import oracle.sql.STRUCT;
import oracle.sql.StructDescriptor;
....
public class YourTypeHandler implements TypeHandler
{
....
    public void setParameter(PreparedStatement ps, int i, Object parameter, JdbcType jdbcType) throws SQLException
    {
        List<YourObject> objects = (List<YourObject>) parameter;

        StructDescriptor structDescriptor = StructDescriptor.createDescriptor("YOUR_OBJECT", ps.getConnection());

        STRUCT[] structs = new STRUCT[objects.size()];
        for (int index = 0; index < objects.size(); index++)
        {
            YourObject pack = packs.get(index);
            Object[] params = new Object[2];
            params[0] = pack.getFieldOne();
            params[1] = pack.getFieldTwo();
            STRUCT struct = new STRUCT(structDescriptor, ps.getConnection(), params);
            structs[index] = struct;
        }

        ArrayDescriptor desc = ArrayDescriptor.createDescriptor("YOUR_OBJECT_ARRAY", ps.getConnection());
        ARRAY oracleArray = new ARRAY(desc, ps.getConnection(), structs);
        ps.setArray(i, oracleArray);
    }
}

Then invoke the procedure,

call your_proc
(
#{yourObjects, javaType=Object, jdbcType=ARRAY, jdbcTypeName=YOUR_OBJECT_ARRAY, mode=IN, typeHandler=YourObjectArrayTypeHandler}
)

Andy Pryor's answer is very good I tested it and it really works. But it has an error at typeHandler:

call your_proc
(
#{yourObjects, javaType=Object, jdbcType=ARRAY, jdbcTypeName=YOUR_OBJECT_ARRAY, mode=IN, typeHandler=YourObjectArrayTypeHandler}
)

should be:

call your_proc
(
#{yourObjects, javaType=Object, jdbcType=ARRAY, jdbcTypeName=YOUR_OBJECT_ARRAY, mode=IN, typeHandler=YourTypeHandler}
)

The TypeHandler has an error as well: (there is no "packs" and there is some difference in the method parameters in my version)

@Override
public void setParameter(PreparedStatement ps, int i, Object parameter, String arg3) throws SQLException {
    List<YourObject> objects = (List<YourObject>) parameter;

    StructDescriptor structDescriptor = StructDescriptor.createDescriptor("YOUR_OBJECT", ps.getConnection());

    STRUCT[] structs = new STRUCT[objects.size()];
    for (int index = 0; index < objects.size(); index++)
    {
        YourObject pack = objects.get(index);
        Object[] params = new Object[2];
        params[0] = pack.getFieldOne();
        params[1] = pack.getFieldTwo();
        STRUCT struct = new STRUCT(structDescriptor, ps.getConnection(), params);
        structs[index] = struct;
    }

    ArrayDescriptor desc = ArrayDescriptor.createDescriptor("YOUR_OBJECT_ARRAY", ps.getConnection());
    ARRAY oracleArray = new ARRAY(desc, ps.getConnection(), structs);
    ps.setArray(i, oracleArray);
}

And here is an example for xml mapping:

  <parameterMap id="updateHierPersonAssignMap" class="java.util.Map" >                      
    <parameter property="p_array" jdbcType="ARRAY" javaType="Object" mode="IN" typeHandler="com.aamtech.ria.model.domain.typehandler.YourTypeHandler"/>
  </parameterMap>
  <procedure id="updateHierPersonAssign" parameterMap="updateHierPersonAssignMap" >
    <![CDATA[ 
        { call ria_am_util_pkg.j_update_hier_person_assign( ? ) }
    ]]>
  </procedure>  

And here is how you can call it from the DAO:

public void update(List array) {
    Map<String, Object> queryParams = new HashMap<String, Object>();
    queryParams.put("p_array", array);
    try {
        client.update("HashMapResult.updateHierPersonAssign", queryParams);
    } catch (SQLException e) {
    }
}

And my procedure looks like this (it just inserts a row into a test table):

Procedure j_update_hier_person_assign (p_array IN YOUR_OBJECT_ARRAY) is
  begin
     FOR i IN 1..p_array.count LOOP
       --dbms_output.put_line();
       insert into test (a) values (p_array(i).field_one);
     END LOOP;
  end;