OS Authentication from Java Program

We are getting the below error while trying to get oracle connection using OS authentication.
from the unix shell, we are able to "sqlplus /" . ie., invoke a sqlplus session using / account
java.sql.SQLException: ORA-01004: default username feature not supported; logon denied
echo $TNS_ADMIN
/data/oracle/product/8.1.7.4/network/admin
We gave the below options
Option 1:
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
conn = DriverManager.getConnection("jdbc:oracle:oci8:@database","","");
Option 2:
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
conn = DriverManager.getConnection("jdbc:oracle:oci8:/@database");
However when substituted with actual user id and password the connection works
conn = DriverManager.getConnection("jdbc:oracle:oci8:@database", user , password);
The 8.1.7.4 oracle client is installed and am using classes12.jar of oracle8i version
Can you pls. help

Karthikeyan,
The error message says it all: feature is not supported.
For your information, your question has been asked (and answered) several times previously in this forum. Did you try searching the forum archives?
Personally, I just live with this limitation -- it's not critical for me. Have you tried the MetaLink Web site?
Good Luck,
Avi.

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