Oracle 10g DBA cannot log on to solution _oracle

Here's the solution:
1-from the command prompt, stop isqlplus:
C:\>isqlplusctl stop
2-assuming that you install Oracle under C Drive, run the following comands:
C:\>set oracle_home=c:\oracle\product\10.2.0\db_1
C:\>set JAVA_HOME=%ORACLE_HOME%\JDK

3-change directory to:
CD%oracle_home%\oc4j\j2ee\isqlplus\application-deployments\isqlplus

4-suppose You need to create a new user with user name ' Yoyo ' and password ' ch51***** ', run the following command:
%java_home%\bin\java-djava.security.properties=%oracle_home%\oc4j\j2ee\home\config\jazn.security.props-jar%O Racle_home%\oc4j\j2ee\home\jazn.jar-user "Isql*plus dba/admin"-password welcome-adduser "ISQL*Plus DBA" Yoyo ch51**** *

5-to Check that adding this new user is successful, run the following command:
%java_home%\bin\java-djava.security.properties=%oracle_home%\oc4j\j2ee\home\config\jazn.security.props-jar%O Racle_home%\oc4j\j2ee\home\jazn.jar-user "Isql*plus dba/admin"-password welcome-listusers "ISQL*Plus DBA"
Results:
Admin
Yoyo
6-to grant a user access to the "WEBDBA role" in the command line, enter:
%java_home%\bin\java-djava.security.properties=%oracle_home%\oc4j\j2ee\home\config\jazn.security.props-jar%O Racle_home%\oc4j\j2ee\home\jazn.jar-user "Isql*plus dba/admin"-password welcome-grantrole webDba "ISQL*Plus DBA" yoyo
7-now, run start isqlplus again and enjoy it:
Isqlplusctl start
8. Revisit: HTTP://HOSTNAME:5560/ISQLPLUS/DBA, give username and password: Yoyo and ch51***** (all lowercase), you can see the Isqlplus login interface,
Then provide user name: SYSTEM, Password: ch51*****, connection identification: (Description= (address_list= address= (protocol=tcp) (Host=kcsqlbi) (port=1521)) ) (Connect_data= (SERVICE_NAME=ORCL)), permission Sysdba, you can access it.