executeQuery method in this PreparedStatement object executes DML/DDL queries

A DESCRIPTION OF THE PROBLEM :
executeQuery method in this PreparedStatement object executes DML/DDL queries when I am connecting to Oracle database using JDBC thin driver. Its successfully executing the DML/DDL commands and then throwing error as no resultset is returned by these commands.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Error should be thrown without executing the DML/DDL commands
ACTUAL -
Error is thrown after successfully executing the DML/DDL commands

FREQUENCY : often