How do I pass a user-defined type as an input to a stored procedure?

After a fair bit of mucking around, I was able to develop a solution. A few observations:

• There is not much documentation about how to do this on the web.
• It seems to me that using user-defined types as inputs is not well supported.
• I found I had to use a Struct which was counter-intuitive (as only arrays were used for outputs).
• The SQLData interface was not used, ie. writeSQL() was never called as I found I had to build the struct manually. readSQL() is called when mapping outputs.
• I had to use DB-specific code for array creation, in my case this meant Oracle classes.

It's possible I may be going about things the wrong way, so I'd welcome comments on my solution.

public void useExample(Example example) throws SQLException {
    String query = "begin example.useExample(?); end;";
    Connection connection = jdbcTemplate.getDataSource().getConnection();
    CallableStatement callableStatement = connection.prepareCall(query);

    Map<String, Class<?>> typeMap = connection.getTypeMap();
    typeMap.put(Example.SQL_OBJECT_TYPE_NAME, ExampleMapper.class);
    connection.setTypeMap(typeMap);

    // Manually convert the example object into an SQL type.
    Object[] exampleAttributes = new Object[]{example.ID, example.Name};
    Struct struct = connection.createStruct(type.getObjectType(), exampleAttributes);

    // Build the array using Oracle specific code.
    DelegatingConnection<OracleConnection> delegatingConnection = (DelegatingConnection<OracleConnection>) new DelegatingConnection(connection);
    OracleConnection oracleConnection = (OracleConnection) delegatingConnection.getInnermostDelegate();
    Object[] data = new Object[]{struct};
    Array array oracleConnection.createOracleArray(Example.SQL_TABLE_TYPE_NAME, data);

    // Set the input value (finally).
    callableStatement.setObject("p_example", array);

    callableStatement.execute();
}