Isolation level when using UserTransaction

Question

          What isolation level does WLS assign to JDBC connection objects when used within
          a user-controlled JTA transaction?
          e.g. when using the following code within a servlet:
          UserTransaction ut = (UserTransaction) ictx.lookup("java:comp/Usertransaction");
          ut.begin();
          DataSource ds = ictx.lookup("java:comp/env/jdbc/datasource");
          Connection conn = ds.getConnection();
          ResultSet rs = ps.executeQuery("....");
          conn.commit();
          Does weblogic force a specific isolation level, or will it fall back to the default
          of the database?
          We are using WLS 8.1 SP1 and Oracle 9.
          /Johan
          

Answer 1

          johan Eltes wrote:
          > What isolation level does WLS assign to JDBC connection objects when used within
          > a user-controlled JTA transaction?
          > e.g. when using the following code within a servlet:
          >
          > UserTransaction ut = (UserTransaction) ictx.lookup("java:comp/Usertransaction");
          > ut.begin();
          > DataSource ds = ictx.lookup("java:comp/env/jdbc/datasource");
          > Connection conn = ds.getConnection();
          > ...
          > ResultSet rs = ps.executeQuery("....");
          > ...
          > conn.commit();
          >
          > Does weblogic force a specific isolation level, or will it fall back to the default
          > of the database?
          > We are using WLS 8.1 SP1 and Oracle 9.
          The Spec says that the connection should be in the DBMS's default isolation level
          until set differently. For Oracle you will be in READ-COMMITTED. That's what you want
          because Oracle's SERIALIZABLE isolation level is problematic, not doing what most
          folks assume...
          Joe
          > /Johan