Problem with Oracle 8.1.7 and JDBC

Question

Im connecting to Oracle 8.1.7 (running on a MS Windows Server) from a JBoss 2.4.10,
running on a Linux box. The code that generates the problem looks like this :
String query = "SELECT some_fields FROM some_table WHERE id = ?";
Prepared Statement ps = conn.prepareStatement(query);
ps.setString(1, id.toString());
ps.executeQuery(); // this throws the folowing exception
java.sql.SQLException: Zamkni?ta instrukcja
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:169)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:211)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:274)
at oracle.jdbc.driver.OracleStatement.ensureOpen(OracleStatement.java:49
35)
at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePrepar
edStatement.java:382)
at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePrepare
dStatement.java:339)
at org.jboss.pool.jdbc.PreparedStatementInPool.executeQuery(PreparedStat
ementInPool.java:71)
The connection is ok. The statement is not closed or anything. The syntax of the query is ok, because i tested it on the Oracle console. What is
strange, is that this exception is thrown only some times. What I mean is that
regardles of the id parameter, the execution of this query some times throws
an excpetion, and some times not, without any special patern.
I will be gratefull for all help
MIchal
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Answer 1

ID is a NUMBER and id.toString() is not a number, for
example it ca be a null reference.
well we tryed also this version :
ps.setLong(1, id.longValue());
moreover the exception wasn't thrown for the value of id :56 but was thrown for the value of id : 88. Hence I think it is a case of something other than my code.
michal