Son To wrote:
> Hi,
> data sent by POST does not get properly sent to my servlet that uses JNI.
> I am sending username/password to the servlet which looks up a user's
> email address via JDBC connection to mySQL and extracts the hostname from
> the email address. The servlet then uses JNI to call rexec to
> authenticate. Other servlet that does not use JNI does not experience this
> problem.
>
> This works fine, but for some reason after a few hours, it stops working
> and gives an default error page. I printed the username and password
> gotten from the form using POST method to stderr and it is null.
> restarting apache or recompiling the servlet fixes the problem.
>
> jserv.log contains
> [14/07/1999 22:48:42:012] (ERROR) ajp11: Servlet Error:
> java.lang.NullPointerException: :
> [14/07/1999 22:48:42:037] (ERROR) an error returned handling request via
> protocol "ajpv11"
>
> jserv.trace
> [19990714 224841.999 EDT] java.lang.NullPointerException:
> at AuthenticateServlet.authenticate(AuthenticateServlet.java:60)
> at AuthenticateServlet.doPost(AuthenticateServlet.java:36)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:521)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
> at
> org.apache.jserv.JServConnection.processRequest(JServConnection.java:
> 335)
> at org.apache.jserv.JServConnection.run(JServConnection.java:197)
> at java.lang.Thread.run(Thread.java)
>
What this stack trace tells you is that at line 60 of AuthenticateServlet,
you used a variable that currently has a null value as an object reference.
Obviously, without seeing the source code, it is not possible to provide any
more advice on what might be going on. But, this is an application
programming error, not a problem with Apache JServ or JNI.
Craig McClanahan
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