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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=15164

NullPointerException when JDBCRealm not configured properly

           Summary: NullPointerException when JDBCRealm not configured
                    properly
           Product: Tomcat 4
           Version: 4.0.6 Final
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: Minor
          Priority: Other
         Component: Catalina
        AssignedTo: [EMAIL PROTECTED]
        ReportedBy: [EMAIL PROTECTED]


if you omit the "userCredCol" attribute from the <Realm> tag when using 
JDBCRealm (for example, if you specify it as "userCredColumn" instead) you end 
up getting a NullPointerException from JDBCRealm.authenticate (line 389).  

The misconfiguration does not directly trigger an error.  The JDBCRealm issues 
this SQL query:

SELECT null FROM user_table WHERE username_col = ?

since this is a valid query, there is no SQLException thrown; but rs.getString
(1) returns null instead of the user password column.

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