Java class on jsp

how can we call a java class on click of submit button in jsp page?

thanks for info..
I have another problem . i need to code for a page where users can request for the account on my project. users have to fill firts, last name and intranet id and on submitting their details should be send to my email id and they receive the meaasge" your details have been submitted" i tried to use acegi security system. but i already have acegiSecurityconfiguration file where users are being authenticating with their login name and password.. should i write new file? please guide me in this.

Similar Messages

Accessing java class in JSP on Tomcat 5.5 server

Just i want to use a java class in JSP.
Explanation in following steps :
a. MY JSP Code - SimpleBean.jsp
b. My Java file - test.java
c. Path ( Root, jdk, jre , myfiles-test.java, SimpleBean.jsp )
d. Environment Variables
e. Error Message faced
Now Brief explanation.
a. MY JSP Code :
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*,test" errorPage="" %>
<td>
<%! test obj = new test();
obj.setAge(32); %>
<%= obj.getAge(); %>
</td>
b. My Java file - test.java
package test;
class test
private int age;
public int getAge()
     return age;
     public void setAge(int intage)
          this.age = intage;
c. Path ( Root, jdk, jre , myfiles-test.java, SimpleBean.jsp )
Tomcat Root : c:\Program Files\apache\tomcat5.5\webapps\ROOT
jdk : C:\Program Files\Java\jdk1.5.0\bin;
jre : C:\Program Files\Java\jre1.5.0\bin;
test.java : c:\Program Files\apache\tomcat5.5\webapps\ROOT\NRMS\test\test.java
SimpleBean.jsp : c:\Program Files\apache\tomcat5.5\webapps\ROOT\NRMS\test\SimpleBean.jps
d. Environment Variables :
PATH :
C:\Program Files\Java\jdk1.5.0\bin; C:\Program Files\Java\jre1.5.0\bin;
CLASSPATH :
.;C:\Program Files\Java\jre1.5.0\bin;
e. Error Message Faced : ( on accessing url http://localhost:8080/NRMS/SimpleBean.jsp )
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSP
Generated servlet error:
The import test cannot be resolved
An error occurred at line: 26 in the jsp file: /NRMS/test/SimpleBean.jsp
Generated servlet error:
test cannot be resolved (or is not a valid type) for the field SimpleBean_jsp.obj
An error occurred at line: 26 in the jsp file: /NRMS/test/SimpleBean.jsp
Generated servlet error:
test cannot be resolved or is not a type
An error occurred at line: 26 in the jsp file: /NRMS/test/SimpleBean.jsp
Generated servlet error:
Syntax error on token(s), misplaced construct(s)
An error occurred at line: 26 in the jsp file: /NRMS/test/SimpleBean.jsp
Generated servlet error:
Syntax error on token "32", delete this token
An error occurred at line: 28 in the jsp file: /NRMS/test/SimpleBean.jsp
Generated servlet error:
Syntax error on token ";", delete this token
     org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
     org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:328)
     org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:389)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:288)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
     org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:556)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:296)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:245)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.4 logs.
Apache Tomcat/5.5.4
Please explain where i am doing the mistake.
Thanks in advance.
Regards,
Lax.

>
<%@ page contentType="text/html; charset=iso-8859-1"
language="java" import="java.sql.*,test" errorPage=""
%>Your class is test.test.The compiler wouldnt know what test is from your import.
Change import as
java.sql.*,test.test
<%! test obj = new test();
obj.setAge(32); %>The symbol '!' ?

Java Classes and JSP`s (urgent)

hi, my question is:
How can i invoke normal java classes` methods using Jsp`s for this??, is it possible??, if it is, then how do you do this, and where do you have to put the java classes in order to find them from a jsp.
thanks

Hi,
You can access normal java classes in JSP pages. You have to import them in the header like this:
<%@ page language="java" import="//your java class file with package"%>
or if u r using java beans, then use the <usebean> tag. Put the java classes in the classes directory. Which server u r using? If it is JWS, then u have a specified classes directory, where u have to put all the class files along with their packages. Hope this will help.
atanu.

How to load java class from jsp page?

hi all!
Does anyone know how to load java class from jsp page?
I try to load java class from jsp page.
Is it possible to load java class fom jsp page?
thanks and have a good day!

What I mean is How to load/open java class file from jsp page?
I think we can open Applet from jsp page by using
<applet code=helloApplet.class width=100 height=100>
</applet>
but, how to open java class which is an application made by Frame?
thanks and have a good day

Calling java class from jsp page

Dear Friends.
I wrote jsp page and java class.
Am calling java class from jsp page. after processing result,
I have to refresh jsp page from java class.
processing time may take 5 minutes or 1 minute etc. that depends on user.
Can It be possible ? if possible , How ?

Ok, I get a very strange error now:
org.apache.jasper.JasperException: Unable to compile class for JSPerror: An error has occurred in the compiler; please file a bug report (http://java.sun.com/cgi-bin/bugreport.cgi).
What is this??? Anyone?

Problem while trying to execute Java class in JSP using RunTime Class

Hi,
I want to execute a JAVA class through a JSP. For this I am using following code ....
JSP (AAA.jsp) CODE ............
try
String[] cmd = new String[3];
cmd[0] = "cmd.exe" ;
cmd[1] = "/C" ;
cmd[2] = "java -DPeBS_CONFIG_HOME=D:/CASLIntegration/PeBS/srcvob/PeBS/config Service_Statement_Application 22/May/2001 22/May/2003";
Runtime rt = Runtime.getRuntime();
System.out.println("Execing " + cmd[0] + " " + cmd[1] + " " + cmd[2]);
Process proc = rt.exec(cmd);
// any error message?
StreamGobbler errorGobbler = new StreamGobbler(proc.getErrorStream(), "ERROR");
// any output?
StreamGobbler outputGobbler = new StreamGobbler(proc.getInputStream(), "OUTPUT");
// kick them off
errorGobbler.start();
outputGobbler.start();
// any error???
int exitVal = proc.waitFor();
System.out.println("ExitValue: " + exitVal);
catch (Throwable t)
t.printStackTrace();
StreamGobbler THread class Code ..........
import java.util.*;
import java.io.*;
public class StreamGobbler extends Thread
InputStream is;
String type;
StreamGobbler(InputStream is, String type)
this.is = is;
this.type = type;
public void run()
try
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line=null;
while ( (line = br.readLine()) != null)
System.out.println(type + ">" + line);
} catch (IOException ioe)
ioe.printStackTrace();
I have successfully compiled and placed the class file for the above class in JSP's servlet engine. However, when I execute the JSP through explorer Web Browser, I get following compile time error:
An error occurred between lines: 36 and 86 in the jsp file: /casl/LocalApp/VehicleServiceStmt/AAA.jsp
Generated servlet error:
D:\Tomcat\work\localhost\_\casl\LocalApp\VehicleServiceStmt\AAA$jsp.java:118: No constructor matching StreamGobbler(java.io.InputStream, java.lang.String) found in class StreamGobbler.
StreamGobbler errorGobbler = new StreamGobbler(proc.getErrorStream(), "ERROR");
^
An error occurred between lines: 36 and 86 in the jsp file: /casl/LocalApp/VehicleServiceStmt/AAA.jsp
Generated servlet error:
D:\Tomcat\work\localhost\_\casl\LocalApp\VehicleServiceStmt\AAA$jsp.java:121: No constructor matching StreamGobbler(java.io.InputStream, java.lang.String) found in class StreamGobbler.
StreamGobbler outputGobbler = new StreamGobbler(proc.getInputStream(), "OUTPUT");
I am unable to determine the reason of why the constructor which exists in the StreamGobbler Class is not recevied in JSP. If I try to write the same code in JSP as a JAVA class, keeping StreamGobler class same, the programme executes successfully.
Please help me find solution to this at the earliest. Thanks in advance,
Prachi

Thanks,
I got it working by making the constructor Public.
-Prachi

Ordinary java class and jsp page

hi i want to use some java class(not javabean ) in my jsp . how do i import them and use them?

You can just import the package into your JSP, and access it like any other class of the Standard Java API that you access.
fun_one

Passing parameters from a Java class to Jsp page

Hi everybody. I'm newbie in using Java class in conjunction with JSP pages. Infact I have a problem. How can I pass the parameters used in a Java class (as UserName, Password, and so on..) to a JSP page? What methods (and classes) I have to use?
Thank you in advance
Have a nice day

It still doesn't work. I write the code
//my java class
package channel_service;
import java.util.Vector;
* <p>Title: </p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2002</p>
* <p>Company: </p>
* @author unascribed
* @version 1.0
public class CallMenu {
private Vector parameters = new Vector();
public void setParameters( String UserId ) {
parameters.add(0, UserId);
//parameters.add(2, Pin);
//parameters.add(3, UserName);
//parameters.add(4, Greeting);
public Vector getParameters() {
return parameters;
//my jsp page
<%@ page import="Channel_Service.src.channel_service.CallMenu" %>
<%@ page import="java.util.Vector" %>
<html>
<head><title>User Menu Page</title></head>
<body>
<center><h1><i><b>This is your personal User Menu page</b></i></h1></center>
<br>
<br>
<center><h2><i>In the list below you'll find all your personal information (as UserID, Password and so on...)
and all the function you have the rights to use</i></h2></center>
<br>
<br>
<table align=center>
<tr>
<%
CallMenu cl = new CallMenu();
cl.setParameters();
Vector params = cl.getParameters();
String UserId = (String)params.elementAt(0);
String Pin = (String)params.elementAt(1);
String UserName = (String)params.elementAt(2);
String Greeting = (String)params.elementAt(3);
%>
<td><h2><b><i>User ID = <%= UserId %></td></tr>
<tr><td><h2><b><i>PIN = <%= Pin %></td></tr>
<tr><td><h2><b><i>User Name = <%= UserName %></td></tr>
<tr><td><h2><b><i>The system says <%= Greeting %></td></tr>
</table>
</body>

Calling a java class in JSP in Weblogic 5.1

Hi
I am trying to call a java class in a jsp page. But it is giving an error:
Compilation of 'C:\weblogic\myserver\classfiles\jsp_servlet\_knet\_buy.java' failed:
C:\weblogic\myserver\classfiles\jsp_servlet\_knet\_buy.java:79: cannot access jsp_servlet._knet.e24PaymentPipe
probably occurred due to an error in /knet/buy.jsp line 25:
e24PaymentPipe pipe = new e24PaymentPipe();
Is this a problem bcos of the wrong path of the class file which i am calling?
Please help this is urgent

Hello All
As I tried to deploy the easiest project (dummy.war) on WebLogic 8.1.5, There is only one class (without package) Login.class
*********** Listing of the dummy WAR ***********
META-INF/
META-INF/MANIFEST.MF
WEB-INF/
WEB-INF/classes/
WEB-INF/classes/Login.class
WEB-INF/web.xml
index.jsp
login.jsp
************ Output of deployment from Admin Console****************
Log:
A log of the task's activities.
[Deployer:149033]preparing application dummy on intranetAdmin
[Deployer:149033]prepared application dummy on intranetAdmin
[Deployer:149033]activating application dummy on intranetAdmin
[Deployer:149033]failed application dummy on intranetAdmin
[Deployer:149034]An exception occurred for task [Deployer:149026]
Deploy application dummy on intranetAdmin.:
Exception:weblogic.management.ApplicationException: start() failed.
Module: dummy Error: weblogic.management.DeploymentException:
[HTTP:101216]Servlet: "index" failed to preload on startup in Web application:
" dummy ".
weblogic.servlet.jsp.CompilationException: Compilation of D:\apps\wlsapp\
INTRAN~1\.\intranetAdmin\.wlnotdelete\extract\intranetAdmin_ dummy _ dummy
\jsp_servlet\__index.java failed.
D:\apps\wlsapp\INTRAN~1\.\intranetAdmin\.wlnotdelete\extract\
intranetAdmin_dummy_dummy\jsp_servlet\__index.java:22: '.' expected
import Login; //[ /login.jsp; Line: 8]
^
1 error
at weblogic.servlet.jsp.JspStub.compilePage(JspStub.java:478)
at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:246)
at weblogic.servlet.jsp.JspStub.prepareServlet(JspStub.java:196)
at weblogic.servlet.internal.WebAppServletContext.preloadServlet(WebAppServletContext.
java:3430)
at weblogic.servlet.internal.WebAppServletContext.preloadServlets(WebAppServletContext.
java:3387)
at weblogic.servlet.internal.WebAppServletContext.preloadServlets(WebAppServletContext
.java:3373)
at weblogic.servlet.internal.WebAppServletContext.preloadResources(WebAppServletContext.java:3356)
at weblogic.servlet.internal.WebAppServletContext.setStarted(WebAppServletContext.java:
6208)
at weblogic.servlet.internal.WebAppModule.start(WebAppModule.java:864)
at weblogic.j2ee.J2EEApplicationContainer.start(J2EEApplicationContainer.java:2134)
at weblogic.j2ee.J2EEApplicationContainer.activate(J2EEApplicationContainer.java:2175)
at weblogic.management.deploy.slave.SlaveDeployer$ComponentActivateTask.
activateContainer(SlaveDeployer.java:2520)
at weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.doCommit(SlaveDeployer
.java:2438)
at weblogic.management.deploy.slave.SlaveDeployer$Task.commit(SlaveDeployer.java:2155)
at weblogic.management.deploy.slave.SlaveDeployer$Task.checkAutoCommit(SlaveDeployer.java:2254)
at weblogic.management.deploy.slave.SlaveDeployer$Task.prepare(SlaveDeployer.java:2149)
at weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.prepare(SlaveDeployer.
java:2401)
at weblogic.management.deploy.slave.SlaveDeployer.processPrepareTask(SlaveDeployer.java:
883)
at weblogic.management.deploy.slave.SlaveDeployer.prepareDelta(SlaveDeployer.java:591)
at weblogic.management.deploy.slave.SlaveDeployer.prepareUpdate(SlaveDeployer.java:500)
at weblogic.drs.internal.SlaveCallbackHandler$1.execute(SlaveCallbackHandler.java:25)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:224)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:183)
Caused by: java.io.IOException: Compiler failed executable.exec
at weblogic.utils.compiler.CompilerInvoker.compileMaybeExit(CompilerInvoker.java:470)
at weblogic.utils.compiler.CompilerInvoker.compile(CompilerInvoker.java:328)
at weblogic.utils.compiler.CompilerInvoker.compile(CompilerInvoker.java:336)
at weblogic.utils.compiler.CompilerInvoker.compile(CompilerInvoker.java:321)
at weblogic.servlet.jsp.JspStub.compilePage(JspStub.java:451)
... 22 more
- with nested exception:
[java.io.IOException: Compiler failed executable.exec]
I put this class into a dummy package named sample, changed package declaration within this class and changed import statement within jsp pages like this :
<%@ page import="sample.Login " %>
<jsp:useBean id="logUsr" scope="session" class="sample.Login" />
When I did like this, everything is ok. No more exception.
If my application has so many java classes under WEB-INF/classes/ without creating package, it may be so inconvenience.
Please kindly let me know why this exception (class not found exception) occurred.
And what is the solution? I cannot deploy the application successfully yet.
many thanks,
Zin Ko Win

Import java-classes in JSP-page

Hi,
I'm starting with JSP and with trying one of the first examples in the book "beginning J2EE 1.4" from wrox, i got following problem.
i'm trying to import a java-class in the package CH03 with
<%@ page import="Ch03.FaqCategories" %>but he didn't find the package Ch03.
I try already many things and i have no idea of the cause of the problem. So it's difficult to give information that leads to the solution.
Maybe helpfull is the direcory-structure:
jsp-page: /Ch03/welcome.jsp
java-classe: /Ch03/WEB-INF/classes/Ch03/FaqCategories.class
If you need source-codes or other information, just ask.
Thanks,
Dennis

Thank you,
Your help was one step into the good direction and that problem is solved.
The application work now with studio one, but if i try it to work it with a stand-alone tomcat server it doesn't work anymore. I go first try to solve this problem by my self or at least try to describe the problem more exactly, before i ask for new help.
but if you have any idea, that's always welcome...
with regards,
Dennis

Java Classes in JSP

I'd like to use some of my java classes from my JSP pages, how do I do
          this?
          ie: I have a class
          public class Test
          public static void uselessFunx()
          //do nothing
          How would I get access to the Test class and call uselessFunx()?
          Thanx.


Good point Toad. That is a loaded question!
          If you do want to 'hack' in your classes, then you should
          A) Use the PAGE directive to import the class package into your JSP <%@ page
          import="mypackages.myclasses.*" %>
          B) Instantiate the class using a scriptlet <% Test myTest = new Test(); %>
          C) Reference the class from a scriptlet <% String result =
          myTest.uselessFunx(); %>
          D) You can output results referencing these new variables using <%= result
          %>
          Make sure you're using packages. Otherwise you'll have great difficulty
          convincing the JSP that it's in the same package as your class.
          "Toad" <[email protected]> wrote in message
          news:[email protected]...
          > This is a loaded question. I would recommend using custom actions (tags)
          or
          > the built-in jsp:usebean tag. Though not recommended you can also
          > instantiate a class inside a sniplet. If these are unfamiliar topics
          > definitely consider reading an introductory JSP article or two.
          >
          > "S D" <[email protected]> wrote in message
          > news:[email protected]...
          > > I'd like to use some of my java classes from my JSP pages, how do I do
          > > this?
          > >
          > > ie: I have a class
          > >
          > > public class Test
          > > {
          > > public static void uselessFunx()
          > > {
          > > file://do nothing
          > > }
          > > }
          > >
          > > How would I get access to the Test class and call uselessFunx()?
          > >
          > > Thanx.
          >
          >

Using java classes in jsp

hi everybody
I'm using Apache Tomcat 5.5.7 and I want to develop very very simple jsp-files.
I have a java class file called MyClass.
When I start the jsp file with the code line
MyClass class = new MyClass();
I get this error: MyClass cannot be resolved or is not a type
As I know the hierachy must be the following:
ProjectRoot/WEB-INF/classes/MyClass.class
ProjectRoot/start.jsp
In the java class the Constructor is empty... so I cannot see why this should make a problem. I also tried to put the class file into a package and import the package. I had the same error then.
I read something about the web.xml file which should be in the WEB-INF directory.
will this help me... and if yes, what do I need to write into it?
If I did any mistake I would be happy if somebody could give me a hint.
Cheers
alex

1 - The class needs to be in a package. eg com.mypackage.MyClass. This file lives in /WEB-INF/classes/com/mypackage/MyClass.class
2 - in your jsp you include the line
<%@ page import="com.mypackage.MyClass" %>
<%
MyClass myClass = new MyClass();
%>
3 - Also note that "class" is a reserved word in java, and can not be used as a variable identifier.
4 - Yes you most probably should have a web.xml file in the WEB-INF directory.
Look under the webbapps/ROOT/WEB-INF for a basic example.
Cheers,
evnafets

Java class in jsp ?

Hi All,
I have create the java class file. the file was runing fine. but , i include the class file include the jsp file. it can't be working. please give me a solution. i have attached the file.
<%@ page contentType="text/html; charset=utf-8" language="java" import="java.io.*" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
<%@
     public class execall{
     public static void RunTest()
          Runtime r=Runtime.getRuntime();
          Process p=null;
          try
          String s="c:/Program Files/Chessware/TouchIt/TouchItf.exe";
          p=r.exec(s);
          catch(Exception e){
          System.out.println("error==="+e.getMessage());
          e.printStackTrace();
     public static void main(String[] a)
          RunTest();
%>
</body>
</html>
Regards,
Prabha

myposts wrote:
Don't write javacode inside jsp.Fully agree with you.
You just call it in scriptlet.You now contradicts yourself. Scriptlets are Javacode inside JSP.
Omit scriptlets. Write Java code in Java classes only. Use a Servlet to control the requests. Use Javabeans to transfer data. Use utility classes for common logic.

Tag to take a java class in JSP page

Hi,
� need to get a tag to get a java class for example Test.java into a JSP page like MyJSP.jsp so that � can ,after doing this, call its methods, variables etc.
Thank you !

� know a way to do th�s us�ng JRun but the programme � have (NETBEANS IDE 3) does not accept �t.

Scope of a java class in JSP page

Hi
If I use a java bean using the
<jsp:useBean
id="beanSomeName"
scope="page|request|session|applicaton
I can specify the scope of of the bean after which I can assume it is Garbage Collected.
However if I just create a new Java Class in a jsp bean ( I inherited this code ) what will be scope of this java class. When will it be Garbage collected.
Is it Page scope?
Thanks
bib/-

If you do
<% MyClass c = new MyClass(); %>
and don't do anything else to store it in the request or session than it is like page scope.
if you do
<%! MyClass c = new MyClass(); %>
it is more like application scope.

Java class on jsp

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