Why Server Cannot Produce Same Warning Message Compared To Local Deployed Project

I have a question: I have a Java/JSP/JavaScript project that access back end Oracle database, and provide interaction through tomcat. After we deployed our project, I found one button does not generate necessary warning message from server, but when I deployed and tested our project on local PC, it does generate correct warning message. I am using the same IE, same tomcat version, and I am sure my container is pointing to the same database, and I am sure I using same version of project code by checking with GIT.
 
Here is the button that I click:

<a target="frmMain" href="RealignServlet?button=REALIGNMENT" title="Procedure Alignment">Align</a><br> 

And here is part of the code of RealignServlet:
 
    public class RealignServlet extends SiapBaseServlet { 
    private static final long serialVersionUID = 1L;
    private static final Logger logger = AppLogger.getLogger(RealignServlet.class.getName());
    private static final String PROC_QUERY_JSP = "ProcQuery.jsp";
    private static final String REALIGN = "REALIGNMENT";
 
[Code] .....
 
Our problem is server could not generate alignMsg. But we can get it on local deployed project.