CREATE OR REPLACE TYPE "ARRAY_STRING" IS TABLE OF VARCHAR2(4000);

Connected to Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 
Connected as mumytroll@mumytroll_oracle

SQL> select * from v$version;
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE	11.2.0.3.0	Production
TNS for Linux: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production

SQL> select * from nls_session_parameters
  2  /
PARAMETER                      VALUE
------------------------------ ----------------------------------------
NLS_LANGUAGE                   RUSSIAN
NLS_TERRITORY                  CIS
NLS_CURRENCY                   р.
NLS_ISO_CURRENCY               CIS
NLS_NUMERIC_CHARACTERS         ,
NLS_CALENDAR                   GREGORIAN
NLS_DATE_FORMAT                DD.MM.RR
NLS_DATE_LANGUAGE              RUSSIAN
NLS_SORT                       RUSSIAN
NLS_TIME_FORMAT                HH24:MI:SSXFF
NLS_TIMESTAMP_FORMAT           DD.MM.RR HH24:MI:SSXFF
NLS_TIME_TZ_FORMAT             HH24:MI:SSXFF TZR
NLS_TIMESTAMP_TZ_FORMAT        DD.MM.RR HH24:MI:SSXFF TZR
NLS_DUAL_CURRENCY              р.
NLS_COMP                       BINARY
NLS_LENGTH_SEMANTICS           BYTE
NLS_NCHAR_CONV_EXCP            FALSE
17 rows selected

SQL> 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="sample.SampleMapper">

<update id="getArrayString" statementType="CALLABLE" parameterType="java.util.Map" >
<![CDATA[
declare
  v ARRAY_STRING := ARRAY_STRING();
begin
  v.extend(1);
  v(v.Last()) := 'Param1';
  v.extend(1);
  v(v.Last()) := 'Param2';
  v.extend(1);
  v(v.Last()) := 'Param3';
  v.extend(1);
  v(v.Last()) := 'Param4';
  #{map.result, jdbcType=ARRAY, javaType=OBJECT, jdbcTypeName=ARRAY_STRING, typeHandler=sample.SampleHandler, mode=OUT} :=  v;
end;
]]>

  </update>

</mapper>

package sample;

import oracle.jdbc.OracleTypes;
import oracle.sql.ARRAY;
import oracle.sql.ArrayDescriptor;
import org.apache.ibatis.type.JdbcType;
import org.apache.ibatis.type.TypeHandler;

import java.sql.*;

public class SampleHandler implements TypeHandler {


  @Override
  public void setParameter(PreparedStatement preparedStatement, int i, Object o, JdbcType jdbcType) throws SQLException {
    // Сюда не заходим даже.
  }

  @Override
  public Object getResult(ResultSet resultSet, String s) throws SQLException {
    return null;  //To change body of implemented methods use File | Settings | File Templates.
  }

  @Override
  public Object getResult(ResultSet resultSet, int i) throws SQLException {
    return null;  //To change body of implemented methods use File | Settings | File Templates.
  }

  @Override
  public Object getResult(CallableStatement callableStatement, int i) throws SQLException {
    Object z = callableStatement.getObject(i);
    ARRAY b = (ARRAY) z;
    Object[] x = (Object[]) b.getArray();
    for (Object o : x) {
      // Выводим что нам прилетело.
      System.out.println("==>" + o.toString() + "  " + o.getClass().getName());
    }
    return x; 
  }

}

package sample;

import org.apache.ibatis.annotations.Param;

import java.util.Map;

public interface SampleMapper {
  public void getArrayString(@Param("map") Map<String, Object> map);
}

package sample;

import oracle.sql.ARRAY;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.util.HashMap;
import java.util.Map;
import static org.junit.Assert.assertNotNull;

@RunWith(SpringJUnit4ClassRunner.class)
public class SampleMapperTest extends AbstractMapperTest {

  @Autowired
  SampleMapper sampleMapper;

  @Test
  public void testGetArrayString() throws Exception {

    Map<String, Object> param = new HashMap<String, Object>();
    SampleMapper.getArrayString(param);
    assertNotNull("Должны получить значение", param.get("result"));
  }
}