Need help in Pessimistic locking

I am getting the Maiximum of primaryKey field using reportquery ..now i want to lock the object of the report query. i am doing as following
ExpressionBuilder exp=new ExpressionBuilder();
ReportQuery query=new ReportQuery();
query.setReferenceClass(Abc.class);
query.addAttribute("memberId",exp.get("memberId").maximum());
query.acquireLocksWithoutWaiting();
Vector results = (Vector)uow.executeQuery(query);
System.out.println("results---->"+results);
now i increment the value of primary key as follows
ReportQueryResult result1=(ReportQueryResult)results.get(0);
System.out.println("hello"+result1.getByIndex(0));
Integer ctr=(Integer)result1.getByIndex(0);
System.out.println("ctr:-"+ctr);
int count=ctr.intValue();
count=count+1;
System.out.println("incrementedValue:-"+count)
here i insert the new record to the database ;;
the whole code work fine but when i trying to implement the pessimistic locking by
     query.acquireLocksWithoutWaiting();
it will gives the following error..Please help me ..thanks in Advance
ServerSession(28523022)--Connection(27817788)--SELECT MAX(MemberId) FROM Abc FOR UPDATE OF * NOWAIT
Local Exception Stack:
Exception [TOPLINK-4002] (OracleAS TopLink - 10g (9.0.4.5) (Build 040930)): oracle.toplink.exceptions.DatabaseException
Exception Description: com.sybase.jdbc3.jdbc.SybSQLException: Incorrect syntax near '*'.
Internal Exception: com.sybase.jdbc3.jdbc.SybSQLException: Incorrect syntax near '*'.
Error Code: 102
     at oracle.toplink.exceptions.DatabaseException.sqlException(DatabaseException.java:227)
     at oracle.toplink.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:698)
     at oracle.toplink.threetier.ServerSession.executeCall(ServerSession.java:506)
     at oracle.toplink.internal.queryframework.CallQueryMechanism.executeCall(CallQueryMechanism.java:131)
     at oracle.toplink.internal.queryframework.CallQueryMechanism.executeCall(CallQueryMechanism.java:115)
     at oracle.toplink.internal.queryframework.CallQueryMechanism.executeSelectCall(CallQueryMechanism.java:194)
     at oracle.toplink.internal.queryframework.CallQueryMechanism.selectAllRows(CallQueryMechanism.java:565)
     at oracle.toplink.internal.queryframework.ExpressionQueryMechanism.selectAllRowsFromTable(ExpressionQueryMechanism.java:733)
     at oracle.toplink.internal.queryframework.ExpressionQueryMechanism.selectAllReportQueryRows(ExpressionQueryMechanism.java:694)
     at oracle.toplink.queryframework.ReportQuery.execute(ReportQuery.java:442)
     at oracle.toplink.queryframework.DatabaseQuery.execute(DatabaseQuery.java:493)
     at oracle.toplink.queryframework.ReadQuery.execute(ReadQuery.java:125)
     at oracle.toplink.publicinterface.Session.internalExecuteQuery(Session.java:1958)
     at oracle.toplink.threetier.ServerSession.internalExecuteQuery(ServerSession.java:629)
     at oracle.toplink.threetier.ClientSession.internalExecuteQuery(ClientSession.java:392)
     at oracle.toplink.publicinterface.Session.executeQuery(Session.java:1086)
     at oracle.toplink.publicinterface.UnitOfWork.internalExecuteQuery(UnitOfWork.java:2189)
     at oracle.toplink.publicinterface.Session.executeQuery(Session.java:1086)
     at oracle.toplink.publicinterface.Session.executeQuery(Session.java:1038)
     at com.pearson.Test.Test.insert(Test.java:664)
     at com.pearson.Test.Test.main(Test.java:78)
Caused by: com.sybase.jdbc3.jdbc.SybSQLException: Incorrect syntax near '*'.
     at com.sybase.jdbc3.tds.Tds.a(Unknown Source)
     at com.sybase.jdbc3.tds.Tds.nextResult(Unknown Source)
     at com.sybase.jdbc3.jdbc.ResultGetter.nextResult(Unknown Source)
     at com.sybase.jdbc3.jdbc.SybStatement.nextResult(Unknown Source)
     at com.sybase.jdbc3.jdbc.SybStatement.nextResult(Unknown Source)
     at com.sybase.jdbc3.jdbc.SybStatement.queryLoop(Unknown Source)
     at com.sybase.jdbc3.jdbc.SybStatement.executeQuery(Unknown Source)
     at com.sybase.jdbc3.jdbc.SybPreparedStatement.executeQuery(Unknown Source)
     at oracle.toplink.internal.databaseaccess.DatabaseAccessor.executeSelect(DatabaseAccessor.java:802)
     at oracle.toplink.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:651)
     ... 19 more

I will explain you what I am trying to do:- we want to allocate the primary key to each new inserted row. suppose there are more than one user who are trying to insert the record in the database on the click of save button..how we can handle this situation by allocating them unique Id to each row..how we can genrate unique primary key to all the users who are inserting the new rows.
Please help me how can i genrate unique primary key if more than one user inserting the data in the database. As you said use sequencing in toplink how can i use this?our database is sybase is it support Pessimistic locking or optimistic locking. need urgent help
thanks in advance

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