Read/write table lock

[Fabio Galarraga]

Hi to all:
Somebody knows how to make a read/writa table lock?
I'm trying with java source:

stmt.execute("LOCK TABLES table-x READ, table-x WRITE");
----
stmt.execute("UNLOCK TABLES");

but it fails.

Best regards,
Fabio Galarraga
fabio@stripped