Dünyada 10 çeşit insan vardır, binary bilenler ve bilmeyenler.

.0.0.1:1521:XE");
// create a Connection object and connect to the database
// as store_user using the Oracle JDBC Thin driver
Connection myConnection = ds.getConnection();
Properties p = ds.getConnectionProperties();
System.out.println(p.getProperty("disableDefineColumnType"));
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This code will throw "null exception". Because
   Properties p = ds.getConnectionProperties();
line return exactly null :)

Solution: We must set it first.

ref: http://forums.oracle.com/forums/thread.jspa?forumID=99&threadID=403342