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From Adile Abbadi <ad...@minitdrugs.com>
Subject RE: Error 500 messages
Date Fri, 22 Jul 2005 18:42:20 GMT
Hi Tim,

Thanx for the information - I forgot about that. I guess the question is why
did it work in Tomcat 3 and not Tomcat 4 and second is there a workaround to
get it to work?

Adile


-----Original Message-----
From: Tim Funk [mailto:funkman@joedog.org]
Sent: July 22, 2005 12:20 PM
To: Tomcat Users List
Subject: Re: Error 500 messages


This line <jsp:include page="top.html" flush="true"> will commit the
response
and send html back to the client. Once that is done - no error messages will
be sent back to the client and you will end up with a blank screen.

-Tim

Adile Abbadi wrote:

> Hi Rob,
>
> Thanx for this - this is great - I may have to use this because I think I
> have truly found a bug in Tomcat as this issue is not happening on my
Tomcat
> 3 server. I did a bit more investigation and I found some interesting
> things. This is going to be a long email with code and stuff but whoever
> wants to read it please do - because the results are weird.
>
> I created the following simple JSP page
>
> <%@ page language="java"
> import="javax.crypto.*,java.sql.*,java.net.*,dbc.DBConnectionManager" %>
> <%^M
>         String query = "select * from patient_info where ref_client = 38
and
> pat_lname like '%SM'ITH%';";
>         DBConnectionManager connMgr;
>         connMgr = DBConnectionManager.getInstance();
>         Connection Conn = connMgr.getConnection("podb");
>         Statement SQLS = Conn.createStatement();
>         ResultSet rs = SQLS.executeQuery(query);
>         String col1 = null;
>         String col2 = null;
>         while(rs.next()) {
>                 col1 = rs.getString("pat_id");
>                 col2 = rs.getString("pat_fname");
> %>
> <%=col1%>: <%=col2%><br>
> <br>
> <%
>         }
>         rs.close();
>         SQLS.close();
>         connMgr.freeConnection("podb",Conn);
> %>
>
> As you can see I did a syntax error in the query and  the error comes to
the
> screen as expected
>
> javax.servlet.ServletException: ERROR:  syntax error at or near "ITH" at
> character 74
>
> I said that's weird so I tried to compare my complicated JSP files to what
I
> have here to see what is different (if I did something wrong)  and I found
> this
>
> If I add an include at certain parts of the page - I see the result I was
> talking about. For example if I do this:
>
> <jsp:include page="top.html" flush="true">
> <%@ page language="java"
> import="javax.crypto.*,java.sql.*,java.net.*,dbc.DBConnectionManager" %>
> <%^M
>         String query = "select * from patient_info where ref_client = 38
and
> pat_lname like '%SM'ITH%';";
>         DBConnectionManager connMgr;
>         connMgr = DBConnectionManager.getInstance();
>         Connection Conn = connMgr.getConnection("podb");
>         Statement SQLS = Conn.createStatement();
>         ResultSet rs = SQLS.executeQuery(query);
>         String col1 = null;
>         String col2 = null;
>         while(rs.next()) {
>                 col1 = rs.getString("pat_id");
>                 col2 = rs.getString("pat_fname");
> %>
> <%=col1%>: <%=col2%><br>
> <br>
> <%
>         }
>         rs.close();
>         SQLS.close();
>         connMgr.freeConnection("podb",Conn);
> %>
>
> I get the error page as I should - however If I move the include to below
> the <%@ page language="java".... - I get a blank page!!
>
> Now here is where it gets weirder - if I force a java syntax error like as
> follows (I corrected the query):
>
> <jsp:include page="top.html" flush="true">
> <%@ page language="java"
> import="javax.crypto.*,java.sql.*,java.net.*,dbc.DBConnectionManager" %>
> <%^M
>         String query = "select * from patient_info where ref_client = 38
and
> pat_lname like '%SMITH%';";
>         DBConnectionManager connMgr;
>         connMgr = DBConnectionManager.getInstance();
>         Connection Conn = connMgr.getConnection("podb");
>         Statement SQLS = Conn.createStatement();
>         ResultSet rs = SQLS.executeQuery(query);
>         String col1 = null;
>         String col2 = null;
>         if (col1.equals("yes") {
> 	//test
>        }
>         while(rs.next()) {
>                 col1 = rs.getString("pat_id");
>                 col2 = rs.getString("pat_fname");
> %>
> <%=col1%>: <%=col2%><br>
> <br>
> <%
>         }
>         rs.close();
>         SQLS.close();
>         connMgr.freeConnection("podb",Conn);
> %>
>
> An error will get thrown to the screen
>
> org.apache.jasper.JasperException: Unable to compile class for JSP
>
> An error occurred at line: 2 in the jsp file: /testdb.jsp
>
> /var/lib/tomcat4/work/Standalone/localhost/podims/testdb_jsp.java:57: ')'
> expected
> 	if (col1.equals("yes") {
>
> However if I try to force a null pointer error by correcting my syntax
> error - I get a blank screen! If remove the include I get the null pointer
> error no problem. The other behaviour I noticed as well is that as I said
> before if the include is above the <%@ page language.... piece it works
> fine - only if its an html - if its another jsp file - I get a blank
screen
> as well.
>
> So has anyone else seen this behaviour - is there a fix or a work around -
> should I got back to Tomcat 3?? I'm going to try your suggestion Rob and
see
> if that helps at all, but to me its seems like an issue with the JSP
> compiler.
>
> Cheers
>
> Adile
>

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