CallableStatement PostgreSQL Error:A CallableStatement was executed with an invalid number of parameters

Hi All,
Im trying to write sample stored functions in postgresql and call them using
the CallableStatement offered by JDBC.

Here's some my test code
[code=java]
Consumer bean =new Consumer();
CallableStatement pstmt = null;
try {
con.setAutoCommit(false);
String query = "{ ? = call getData( ? ) }";
pstmt = con.prepareCall(query);
pstmt.registerOutParameter(1, Types.OTHER);
pstmt.setInt(2,5);
pstmt.execute(); // execute update statement
bean=(Consumer)pstmt.getObject(1);
System.out.println("bean"+bean.getConsumer_name());
.....
[/code]
And my Stored function is of the form .
[code=sql]
CREATE FUNCTION getData(int) RETURNS SETOF db_consumer AS $$
SELECT * FROM db_consumer WHERE consumer_id = $1;
$$ LANGUAGE SQL;
[/code]

However, I'm getting the following error when I try to run the code .

[code=java]
org.postgresql.util.PSQLException: A CallableStatement was executed with an
invalid number of parameters
at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:408)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:381)
at com.enzen.cis.dao.Updatetest.main(Updatetest.java:44)

[/code]
Any idea on why this is happening would be appreciated.

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