Problem with client_encoding UTF8

Hello:

I'm trying to restore a postgres database backup programmatically, I use
JDBC driver (postgresql-9.1-902.jdbc4), and I get the following error,

org.postgresql.util.PSQLException: The server's client_encoding parameter
was changed to UTF8. The JDBC driver requires client_encoding to be UNICODE
for correct operation.
at
org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1366)
at
org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:192)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:451)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:350)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:343)

This is my code:
PreparedStatement preparedStatement;

String content = getScriptContents("C:/script.sql"); //here I read the
contents of the script
String[] statements = content.split(";");

//here I execute with preparedStatement each script line, the error shows in
this line
//SET client_encoding = 'UTF8';

for (String string : statements) {
if (!string.equals("")) {
preparedStatement =
currentConnection.getJDBCConnection().prepareStatement(string);
preparedStatement.execute();
preparedStatement.close();
}
}

The database where I want to restore has as encoding UTF8, so I don't know
why appears this error.

I read this posts, but I'm not clear what is the solution that any of you
proposed for this problem:
http://archives.postgresql.org/pgsql-jdbc/2008-02/msg00175.php
http://postgresql.1045698.n5.nabble.com/SET-client-encoding-UTF8-td2174216.html
http://postgresql.1045698.n5.nabble.com/Re-HACKERS-JDBC-connections-to-9-1-td4310977.html

In the third post it is proposed a patch but I'm not sure if this solve the
error and it seems hasn't been included in the driver after all, please I
would really appreciatte if you tell me why this is happening and which is
the solution for it.

One curious thing, I made a test creating the connection like this, and the
error didn't appear, the restore was successful.
Connection connection =
DriverManager.getConnection("jdbc:postgresql://192.168.2.241:5432/demo_desktop",
"user", "pass");

Before I used for create the connection this class
org.netbeans.api.db.explorer.DatabaseConnection (from NetBeans Platform), I
don't understand why with this one appears the error and with
DriverManager.getConnection doesn't.

Thanks in advance,
Carmen

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