HikariCP with Oracle com.zaxxer.hikari.pool.HikariProxyCallableStatement cannot be cast to oracle.jdbc.OracleCallableStatement

Question

I using Hikari Pool and OracleCallableStatement:

My datasource:

<bean id="myDataSource" class="com.zaxxer.hikari.HikariDataSource">
      <property name="jdbcUrl" value="${my.oracle.url}"/>
      <property name="driverClassName" value="oracle.jdbc.pool.OracleDataSource"/>
      <property name="username" value="${my.oracle.user}"/>
      <property name="password" value="${my.oracle.password}"/>
</bean>

And I try make a request to Oracle: public List getProducts(int numbersMonths, Long initServiceId,

List<Long> serviceIds) throws SQLException {
        Connection cnn = null;
        OracleCallableStatement stm = null;
        ResultSet rs = null;
        List<ProductLink> res = new ArrayList<>();
        final String sql = sqlCust(sqlProducts);
        try {
            cnn = custDataSource.getConnection();
            stm = (OracleCallableStatement) cnn.prepareCall(sql);
            stm.setPlsqlIndexTable(1, serviceIds.toArray(), serviceIds.size(), serviceIds.size(), OracleTypes.BIGINT, 0);
            stm.registerOutParameter(2, OracleTypes.CURSOR);
            stm.setLong(3, initServiceId);
            stm.setInt(4, numbersMonths);
            stm.execute();
            rs = stm.getCursor(2);
            // do stuff
} catch (SQLException ex) {
            DbUtils.closeQuietly(cnn, stm, rs);
            throw ex;
        } finally {
            DbUtils.closeQuietly(cnn, stm, rs);
        }

But I have error om this line: stm = (OracleCallableStatement) cnn.prepareCall(sql);

java.lang.ClassCastException: com.zaxxer.hikari.pool.HikariProxyCallableStatement cannot be cast to oracle.jdbc.OracleCallableStatement

Also I have a error:

Failed to create instance of driver class oracle.jdbc.pool.OracleDataSource, trying jdbcUrl resolution
java.lang.ClassCastException: oracle.jdbc.pool.OracleDataSource cannot be cast to java.sql.Driver

on this line: cnn = custDataSource.getConnection();

What is wrong? Why I getting this errors?

Answer 1

In fact, since you are using a connection pool, the CallableStatement implementation is not from the driver, but from that connection pool instead.

Either you should find a way to access the core implementation (which I think is risky), or you should try to use the CallableStatement only, and not depend on Oracle implementation.