code: private SQLException classNotFound(Object interfaceNames, Set<String> packagesSearched, String dsId, Throwable cause) {
          if (cause instanceof SQLException)
              return (SQLException) cause;
  
          // TODO need an appropriate message when sharedLib is null and classes are loaded from the application
          String sharedLibId = sharedLib.id();
  
          // Determine the list of folders that should contain the JDBC driver files.
          Collection<String> driverJARs = getClasspath(sharedLib, false);
  
          String message = sharedLibId.startsWith("com.ibm.ws.jdbc.jdbcDriver-")
                          ? AdapterUtil.getNLSMessage("DSRA4001.no.suitable.driver.nested", interfaceNames, dsId, driverJARs, packagesSearched)
                          : AdapterUtil.getNLSMessage("DSRA4000.no.suitable.driver", interfaceNames, dsId, sharedLibId, driverJARs, packagesSearched);
  
          return new SQLNonTransientException(message, cause);
      }
docs: Returns an exception to raise when the data source class is not found.
  
  @param interfaceNames names of data source interface(s) or java.sql.Driver for which we could not find an implementation class.
  @param packagesSearched packages in or beneath which we have searched for data source implementation classes.
  @param dsId identifier for the data source that is using this JDBC driver.
  @param cause error that already occurred. Null if not applicable.
  @return an exception to raise when the data source class is not found.