Help with callback from script src= with jsp processing

I am trying to understand several different ways to get dynamic content into a system I am building. These include:
1. <script tags to fetch text from a jsp page
2. <img to fetch images from a jsp page
3. AJAX to fetch text from a jsp page.
(In all cases, the jsp pages will eventually get the data from a MySql database, but right now I am using static code.)
I am having a problem understanding how to use the <script option.
I am starting with an html page with a javascript callback function and a <script with the callback passed as a parameter. The callback function is based on a sample that I found that works, but I don't have the code for the called jsp page.
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Test javascript WebServiceCalls...</title>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
<script type="text/javaScript">
function ws_results1(obj)
     alert("in ws_results1");
       var myobj = obj.ResultSet.totalResultsAvailable;
       alert("The result is "+myobj);
     this.document.getElementById("showTest1").innerHTML = "The result is "+myobj;
</script>
</head>
<body >
<h2 > #1 <SCRIPT tag with immediate loading..... </h2>
WebServiceCalls #1: Use <script src="---.jsp?---&callback=---"> <br>
-----------------------------------------------<br>
Returned code gets inserted in calling page by callback function. <br>
NOTE: <br>
1. Page will delay loading until response is received. <br>
2. Target for callback function must preceed the %lt;script tag as it must be loaded first or it will not yet exist when the callback function executes.<br>
<br>
The following should be dynamically changed: <br>
<div id="showTest1">Please wait..</div>
The above line "Please wait.." should be replaced: <br>
<script type="text/javascript" src="TestWS1.jsp?callback=ws_results1"></script>
<br>
<br>
Rest of page loaded after return...
</body>
</html>The jsp page is below. I am pretty sure that I am missing something here...
<%
   // TestWS1.jsp: return a simple string.....
   //    (Other versions will return JSON structures or images)
// For page imports, wrap each line within a pair to avoid blanks and linefeeds...
%><%@ page import="java.lang.String" %><%
%><%@ page import="java.net.*" %><%
%><%@ page import="java.io.*"   %><%
%><%@ page import="java.util.*" %><%
%><%@ page import="javax.servlet.*" %><%
   System.out.println("TestWS1.jsp: begin");
   // Use PrintStream to allow very long content made up of strings...
   //    thanks to: http://kickjava.com/1793.htm
   ByteArrayOutputStream baos = new ByteArrayOutputStream ( ) ;
   PrintStream ps = new PrintStream ( baos ) ;
   ps.println("\"TestWS1: This is the returned string as HTML <br> This can be any HTML code.<br>\"");
   // now write the ByteArrayOutputStream to the outputstream
   response.setContentType("text/html");
   response.setHeader("Pragma", "no-cache");
   response.setHeader("Cache-Control", "no-cache");
   response.setDateHeader("Expires", 1);
   response.setDateHeader("max-age", 0);
   OutputStream os = response.getOutputStream();
   baos.writeTo(os);
   os.close();
   System.out.println("TestWS1.jsp: done");
%>When I run TestWS1.jsp, I get the expected entries in the system log and the expected output:
"TestWS1: This is the returned string as HTML <br> This can be any HTML code.<br>"However, when I run the TestWS1Call.html, I get the entries in the system log but nothing fires the javascript function.
What am I missing?
Thank you

I found a solution to loading dynamic content using the <script src= tag.
This approach seems to be useful (a) for situations in the jsp content is dependent on client-side characteristics
(such as window size) and (b) because it seems to work on any browser with javascript and does not require an
ActiveX for older versions of IE.
I wrapped the output of the jsp page inside a javascript call to the callback function
ps.println(callback+"(\"TestWS1: This is the returned string as HTML <br> This can be any HTML code.<br>\")");I also changed the content type to javascript.
response.setContentType("text/javascript");Now, when the script tag is found, the jsp page returns a javascript function call to the callback function and passes
the desired content as a single parameter. The callback function then places the content in the appropriate
location on the page.

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Thanks a bunch!!!

COULD NOT OF BEEN BOUGHT BRANDNEW IN 2011** apologies

Need some help with image processing

I have an application where I am reading Code 128 barcodes. Currently I process the images using IMAQ BCG Lookup with B=130, C=60, and G=0.75. This works for about 96% of the images. The other 4% of the images won't decode. I've fiddled with the BCG settings, but can't get any better yield.
The errors I'm getting are:
-1074396150 not a valid Code 128 barcode (~65% of failures)
-1074396142 not a valid linear barcode (~30% of failures)
-1074395277 doesn't pass checksum (~5% of failures)
I've attached a couple of images that won't decode. These are as they came from the camera without any processing. I know it would be good to get higher resolution, but unfortunately, I am stuck with what I have.
I'm hoping someone with more vision experience than I can suggest a better way to process the images.
Thanks
Attachments:
noread 1.png ‏224 KB
noread 3.png ‏248 KB

You might want to try the BCG before the expansion, also.
There is only so much you can do with low resolution images. The gaps between the bars are almost non-existant. You might be able to do some sort of high pass filter horizontally to increase the contrast after expansion.
Bruce
Bruce Ammons
Ammons Engineering

Help with JSP pre-compiling

We have a web application using Jboss4.0.5, jdk 1.6 and And 1.6.5, and now we try to do a pre-compiling as part of our build procedure.
That is the first time I am going to do a pre-comp of a major application, which includes about 1700 jsp files.
The directory tree of the application is as follows:
/project
    |--- > /web_pre-comp/pages/jsp ( it contains all the jsp files )
    |----> /web_pre-comp/WEB-INF ( it contains the web.xml file.)
    |----> /web_pre-comp/WEB-INF/tld ( it contains the tld files)
    |----> /web_pre-comp/WEB-INF/src ( it coutains the generated src file from jsp )
    |---->/web_pre-comp/WEB-INF/classes ( it contains the compiled classes once the jsp java files are generated.   )
    |----> build.xml ( the ant script )And there is my build.xml file looks like:
<project>
      <target name="pro.jsp.generate" depens="init">
       <java classname="org.apache.jasper.JspC" fork="yes">
          <classpath refid="tomcat.jsp.classpath"/>
          <arg line=" -d "/>
          <arg value="${jsp.generated.src.dir}"/>
          <arg line="-p"/>
          <arg value="${jsp.package.name}"/>
          <arg line="-webapp"/>
          <arg value="${jsp.src.dir}"/>
       </java>
   </target>
</project>When I was running the ant script, I received such message:
[java] org.apache.jasper.JasperException: The absolute uri: http://www.prounlimited.com/wandappconfig.tld cannot be resolved in either web.xml or the jar files deployed with this application
We do have suh messages included in the web.xml file.
<taglib>
        <taglib-uri>http://www.prounlimited.com/wandappconfig.tld</taglib-uri>
        <taglib-location>/WEB-INF/tld/wandappconfig.tld</taglib-location>
    </taglib>Any Ideas how to make it working ?
Another side questions is when some java file are created from JSP, I see some "005f" included in the java file name, such as "inc_sup_princing_view.jsp" creats a
"inc_005fsup_005fpricing_005fview_jsp.java" file. Does someone know why this happen ?
Thanks a lot !
Charlie

We have a web application using Jboss4.0.5, jdk 1.6
and And 1.6.5, and now we try to do a pre-compiling
as part of our build procedure. Hi Charlie,
According to your ant build script you're using Jasper compiler, but your web container is JBoss.
I know that Tomcat uses the Jasper compiler --- but I don't know if JBoss supports Jasper or not. Please check with JBoss if they support Jasper, if not they my support a different pre-compiler.
That is the first time I am going to do a pre-comp of
a major application, which includes about 1700 jsp
files.
The directory tree of the application is as follows:
/project
|--- > /web_pre-comp/pages/jsp ( it contains all
the jsp files )
|----> /web_pre-comp/WEB-INF ( it contains the
web.xml file.)
|----> /web_pre-comp/WEB-INF/tld ( it contains
the tld files)
|----> /web_pre-comp/WEB-INF/src ( it coutains the
generated src file from jsp )
|---->/web_pre-comp/WEB-INF/classes ( it contains
the compiled classes once the jsp java files are
generated.   )
|----> build.xml ( the ant script )And there is my build.xml file looks like:
<project>
<target name="pro.jsp.generate" depens="init">
<java classname="org.apache.jasper.JspC"
fork="yes">
<classpath refid="tomcat.jsp.classpath"/>
<arg line=" -d "/>
<arg value="${jsp.generated.src.dir}"/>
<arg line="-p"/>
<arg value="${jsp.package.name}"/>
<arg line="-webapp"/>
<arg value="${jsp.src.dir}"/>
java>
</target>
</project>When I was running the ant script, I received such
message:
[java] org.apache.jasper.JasperException: The
absolute uri:
http://www.prounlimited.com/wandappconfig.tld cannot
be resolved in either web.xml or the jar files
deployed with this application
Check if the tld folder is visible to the classpath tomcat.jsp.classpath used inside the Ant build file.
>
We do have suh messages included in the web.xml file.
<taglib>
taglib-uri>http://www.prounlimited.com/wandappconfig.t
ld</taglib-uri>
taglib-location>/WEB-INF/tld/wandappconfig.tld</taglib
-location>
</taglib>Any Ideas how to make it working ?
Another side questions is when some java file are
created from JSP, I see some "005f" included in the
java file name, such as "inc_sup_princing_view.jsp"
creats a
"inc_005fsup_005fpricing_005fview_jsp.java" file.
Does someone know why this happen ?
The 005f is expected, it is for internal reference for the pre-compiler, nothing to worry about.
>
Thanks a lot !
Charlie

Help with jsp session validation

i've build up a page that only users wil 'administrator' as the session is variable can access. if they don't they will be directed to the login page.
However, I'm getting a null pointer exception.
my code is as follows:
<%@ page import="java.io.*"%>
<%
     if (session.getAttribute("id").equals(null) || !(session.getAttribute("id").equals("administrator")))
          response.sendRedirect("adminlogin.htm");
%>
Error Message:
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException
root cause
java.lang.NullPointerException
any pros please help? i know it's something to do with my jsp session validation. thanks in advance.

one more thing, with regrads to the solution evnafets provided. I tried it out on all my pages that requires administrator rights and found that the code only redirects when it's not expecting any parameters. Else, it just display an error message there. Is there a way around this? Or I should let let my end user suffer?
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:248)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:289)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:260)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2396)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:405)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:380)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:508)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:533)
     at java.lang.Thread.run(Thread.java:534)
root cause
java.lang.NullPointerException
     at org.apache.jsp.view_jsp._jspService(view_jsp.java:177)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:136)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:204)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:289)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:260)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2396)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
     at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
     at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:405)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:380)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:508)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:533)
     at java.lang.Thread.run(Thread.java:534)

Help with jsp and javaBean in eclipse/Tomcat

Hi,
I am new to JSP and JavaBean. I am going through tutorial for a jsp page that uses a javaBean. I am using eclipse to create jsp page and the java bean.
My eclipse project "Date" has five package as under:-
1. Deployment Descriptor
2. Java Resources: src
3. build
4. WebContent
I have my data.jsp page in WebContent/WEB-INF/ folder. When I just run date.jsp in a browser as: http://localhost:8080/Date/date.jsp, it gets launched into the browser correctly. But when I add a JavaBean "TimeFormatterBean.java" in the Java Resources:src folder and use it in date.jsp page, I get errors as under:-
org.apache.jasper.JasperException: Unable to compile class for JSP:
An error occurred at line: 5 in the jsp file: /date.jsp
TimeFormatterBean cannot be resolved to a type
2: pageEncoding="ISO-8859-1"%>
3: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
4:
5: <jsp:useBean id="formatter" class="TimeFormatterBean"/>
6:
7: <html>
8: <head>
The data.jsp page is as under:-
<jsp:useBean id="formatter" class="TimeFormatterBean"/>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
     <h1> Date JSP </h1>
     <p> The current time is:
     <%= new java.util.Date() %>
     <jsp:getProperty name="formatter" property="name"/>
     </p>
</body>
</html>I can see "TimeFormatterBean.class" in build/classes folder.
If anyone could please help me out with this, it would be very helpful
Thanks a lot!

You probably should place TimeFormatterBean inside a package, or maybe you could try importing it , even if it�s in the default package, with something like this <%@ page import="TimeFormatterBean" %> at the top

Need serious help with JSP + JDBC/Database connection

Hey all,
I have to build an assignment using JSP pages. I am still pretty new and only learning through trial and error. I understand a bit now, and I have managed to get a bit done for it.
I am having the most trouble with a Login Screen. The requirements are that the a form in a webpage has Username/Number and Password, the user clicks Login, and thats about it. The values for the username/number and password NEED to come from the database and I cannot manage to do this. The thing I have done is basically hardcode the values into the SQL statement in the .jsp file. This works, but only for that one user.
I need it so it checks the username/number and password entered by the user, checks the database to see if they are in it, and if so, give access. I seriously am stuck and have no idea on what to do.
I dont even know if I have made these JSP pages correct for starters, I can send them out if someone is willing to look/help.
I have setup 3 other forms required for the assignment and they are reading data from the db and displaying within tables, I need to do this with non-hardcoded values aswell. Im pretty sure I need to use for example 'SELECT .... FROM .... WHERE username= +usrnm' (a variable instead of username="john" , this is hardcoded), I just CANNOT figure out how to go about it.
Its hard to explain through here so I hope I gave enough info. A friend of mine gave some psuedocode i should use to make it, it seems ok to follow, its just I do not know enough to do it. He suggested:
get the username and pass from the env vars
open the db
make an sql (eg SELECT user, pass FROM users WHERE user = envuser)
index.jsp points to login.jsp
login.jsp get the vars you put into index.jsp
opened the db
is the query returns nothing - then the user is wrong
OR if the passwords dont match
- redirect back to index.jsp
if it does match
- set up a session
- redirect to mainmenu.jsp
Anyway, thanks for any help you can give.
-Aaron

Hi,
Try this... it may help you...
mainMenu.jsp
<html>
<body>
<form method="POST" action="login.jsp">
Username: <input type="text" name="cust_no">
<p>
Password: <input type="password" name="password">
<p>
<input type="submit" value="LOGIN">
</form>
</body>
</html>
login.jsp
<%@ page import="java.io.*, java.sql.*"%>
<html>
<body>
<%
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection connection = DriverManager.getConnection("jdbc:odbc:rocky");
Statement statement = connection.createStatement();
String query = "SELECT cust_no, password FROM customers WHERE cust_no='";
query += request.getParameter("cust_no") + "' AND password='";
query += request.getParameter("password") + "';";
ResultSet resSum = statement.executeQuery(query);
if (request.getParameter("cust_no").equalsIgnoreCase(resSum.getString("cust_no") && request.getParameter("password").equalsIgnoreCase(resSum.getString("password"))
%>
<h2>You are logged in!</h2>
<%
else
%>
<h2>You better check your username and password!</h2>
<%
}catch (ClassNotFoundException cnfe){
System.err.println(cnfe);
}catch (SQLException ex ){
System.err.println( ex);
}catch (Exception er){
er.printStackTrace();
%>
</body>
</html>
I didn't check the code that I wrote. So you may have to fix some part of it. Also this may not be the best solution, but it will help you to understand the process easily.
The more efficient method is to check whether the result set returned from the database is null or not.... I hope you got the idea... Good luck!
Rajesh

Help with callback from script src= with jsp processing

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