Difference between JT400.jar and jt400Native.jar (observation)

HiI just observed this difference between creating JDBC connection using
jt400.jar and jt400native.jar

If you have a user id with invalid job description and have jt400native.jar
in classpath then you get error as below, but if you change classpath to use
jt400.jar file then you get a valid connection, it seems that jt400 some how
ignores job description,


Tue Apr 21 17:21:18:070 IST 2009 as400: Connection null (159644216) :
Throwing exception. Actual exception: The application server rejected the
connection. (General security error.) sqlState: 08004 vendor code
-99999.java.sql.SQLException: The application server rejected the
connection. (General security error.)
at java.lang.Throwable.<init>(Throwable.java:195)
at java.lang.Exception.<init>(Exception.java:41)
at java.sql.SQLException.<init>(SQLException.java:40)
at
com.ibm.as400.access.JDError.throwSQLException(JDError.java:528)
at
com.ibm.as400.access.AS400JDBCConnection.setProperties(AS400JDBCConnection.java:3021)
at
com.ibm.as400.access.AS400JDBCDriver.prepareConnection(AS400JDBCDriver.java:1256)
at
com.ibm.as400.access.AS400JDBCDriver.initializeConnection(AS400JDBCDriver.java:1107)
at
com.ibm.as400.access.AS400JDBCDriver.connect(AS400JDBCDriver.java:357)
at java.sql.DriverManager.getConnection(DriverManager.java:512)
at java.sql.DriverManager.getConnection(DriverManager.java:140)
at
GetAS400JDBCConnection.getJDBCConnection(GetAS400JDBCConnection.java:28)
at GetAS400JDBCConnection.main(GetAS400JDBCConnection.java:35)

java.sql.SQLException: The application server rejected the connection.
(General security error.)
at java.lang.Throwable.<init>(Throwable.java:195)
at java.lang.Exception.<init>(Exception.java:41)
at java.sql.SQLException.<init>(SQLException.java:40)
at
com.ibm.as400.access.JDError.throwSQLException(JDError.java:528)
at
com.ibm.as400.access.AS400JDBCConnection.setProperties(AS400JDBCConnection.java:3021)
at
com.ibm.as400.access.AS400JDBCDriver.prepareConnection(AS400JDBCDriver.java:1256)
at
com.ibm.as400.access.AS400JDBCDriver.initializeConnection(AS400JDBCDriver.java:1107)
at
com.ibm.as400.access.AS400JDBCDriver.connect(AS400JDBCDriver.java:357)
at java.sql.DriverManager.getConnection(DriverManager.java:512)
at java.sql.DriverManager.getConnection(DriverManager.java:140)
at
GetAS400JDBCConnection.getJDBCConnection(GetAS400JDBCConnection.java:28)
at GetAS400JDBCConnection.main(GetAS400JDBCConnection.java:35)