Using a JavaBean in JSP
Hello,
I am very new at this, and I am doing a very simple tutorial to use a JavaBean in JSP. I have followed all the procedures from my tutorial, and I get the following error:
org.apache.jasper.JasperException: Can't find a method to write property 'make' of type 'java.lang.String' in a bean of type 'com.wrox.cars.CarBean'
I have the bean:
package com.wrox.cars;
import java.io.Serializable;
public class CarBean implements Serializable {
private String make = "Ford";
public CarBean(){
public String getMake(){
return make;
public void SetMake(String make)
this.make = make;
and the JSP:
<jsp:useBean id="myCar" class="com.wrox.cars.CarBean" />
I have a <jsp:getProperty name="myCar" property="make" /><br>
<jsp:setProperty name="myCar" property="make" value="Ferrari" />
Now I have a <jsp:getProperty name="myCar" property="make" /><br>
The only thing I am missing is this step, where I have been looking for these JAR files and can't find them
I have downloaded many JSTL libraries, and still can't find them/
- dom.jar
- jaxp-api.jar
- jdbc2_0-stdext.jar
- sax.jar
- xalan.jar
- xercesImpl.jar
I really appreciate any help.
Thanks a lot.
Although I should know that, it seems that the error was in the tutorial.
Thanks again,
Similar Messages
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Scope when using a JavaBean with JSP
what is the meaning of this question .....?
"Which of the following can not be used as the scope when using a JavaBean with JSP? "
question 4
site :http://java.sun.com/developer/Quizzes/jsptut/The question is clearly written. I don't see how you can be confused. But let's assume you are since you would not have posed the question.
Dumbed-down:
There are 4 scopes or areas of variable visibility in JavaServer Pages. Which of those can areas can not be used with JavaBeans?
Does that help? -
Problem with JavaBeans in JSP.IT'S URGENT!!!
Hi, i have problems with JavaBeans in JSP.
In a jsp file( locating in ROOT directory of tomcat 4.0.6 :jakarta-tomcat-4.0.6\webapps\root ) i have this code:
<jsp:useBean id="paramBean" class="licentza.ParamBean" />
<jsp:setProperty name="paramBean"
property="nume"
value='<%= request.getParameter("numeUser") %>' />
where ParamBean it's a "bean" class locating in jakarta-tomcat-4.0.6\webapps\examples\web-inf\classes\licentza (licentza is the package i'm using).
And i get this error:
Generated servlet error:
D:\jakarta-tomcat-4.0.6\work\Standalone\localhost\_\dora\intrare2$jsp.java:67: Class licentza.ParamBean not found.
ParamBean paramBean = null;
What is the problem?Thank you.Hi,
Put the class file or the package under :jakarta-tomcat-4.0.6\webapps\root\WEB-INF\classes.
Rajesh -
Hi
I want to use code that parses regular expressions with java and to that end I would like to use jregex1.2_01.jar (if there is a native jar file in oracle that does the same, that woule be good, but I could not find anything that refers to regex or jregex).
I tried to put that new jar file in two locations in the portal area under WEB-INF\lib, namely in:
C:\oracle\ora9ias\j2ee\OC4J_Portal\applications\portal\portal\WEB-INF\lib
where there are a lot of other jar files and also in:
C:\oracle\ora9ias\j2ee\OC4J_Portal\applications\jpdk\jpdk\WEB-INF\lib
However, when I try to compile my code, it fails on the import line:
import jregex.util.io.*;
(the line itself is correct)
Obviously the jregex1.2_01.jar file is not in my classpath, but when oracle was installed, it did not create a CLASSPATH environment variable, so I would not like to make one that may exclude others oracle jars that then are not listed in CLASSPATH.
I have two questions:
1. How does import additional jars into Oracle, so that they can be used by java programs, and are there any inherent dangers in doing that?
2. Where do I place my class file, if I want to use that class file as a javabean. The bean will be referred to by a jsp file which has been imported as a portlet. I assumed I would place my beans under
C:\oracle\ora9ias\j2ee\OC4J_Portal\applications\jpdk\jpdk\WEB-INF\lib
as my jsp files are residing close to that, namely in:
C:\oracle\ora9ias\j2ee\OC4J_Portal\applications\jpdk\jpdk\htdocs\myjsps
but I am not sure.
Can anyone help me with setting up additional jars so they can be used by java files (to be used as javabeans) and with the location and use of javabeans in Oracle Portal?
Any help will be greatly appreciated.
Thanks very much
HugoHi Hugo,
When developing server-side applications, forget about the CLASSPATH environment variable. You must instead become familiar with how the server's classloading scheme operates.
From your post, it looks as though you already are familiar to some degree, because you have correctly identified one of the places to put extra jar files, namely WEB-INF/lib.
At first glance, I would have expected your import to work with the jar file located in WEB-INF/lib - have you made sure you bounced the server?
Also, make sure that any dependencies of jregex are also included in WEB-INF/lib.
Another thing to try is add an entry into ${OH}/j2ee/OC4J_Portal/config/application.xml which explicitly references the jregex jar file.
Regards,
Gareth
(PDK team) -
In Jsp TagLib how can I get the Attribute value (like JavaBean) in jsp
Dear Friends,
TagLib how can I get the Attribute value (like JavaBean) in jsp .
I do this thing.
public void setPageContext(PageContext p) {
pc = p;
pc.setAttribute("id", new String("1") );
pc.setAttribute("first_name",new String("Siddharth")); //,pc.SESSION_SCOPE);
pc.setAttribute("last_name", new String("singh"));
but in Jsp
<td>
<%=pageContext.getAttribute("first_name"); %>
cause null is returing.
Pls HELP me
with regards
Siddharth SinghFirst, there is no need to pass in the page context to the tag. It already is present. How you get to it depends on what type of tag:
Using [url http://java.sun.com/j2ee/1.4/docs/api/javax/servlet/jsp/tagext/SimpleTagSupport.html]SimpleTagSupport
public class MyTag extends SimpleTagSupport
public void doTag()
PageContext pc = (PageContext)getJspContext();
pc.setAttribute("first_name", "Siddharth");
pc.setAttribute("last_name", "Singh");
pc.setAttribute("id", "1");
}Using [url http://java.sun.com/j2ee/1.4/docs/api/javax/servlet/jsp/tagext/TagSupport.html]TagSupport or it's subclass [url http://java.sun.com/j2ee/1.4/docs/api/javax/servlet/jsp/tagext/BodyTagSupport.html]BodyTagSupport the page context is aleady declared as an implicit object:
public class MyTag extends TagSupport
public void doStartTag()
pageContext.setAttribute("first_name", "Siddharth");
pageContext.setAttribute("last_name", "Singh");
pageContext.setAttribute("id", "1");
}In each case, this sort of thing should work:
<mytags:MyTag />
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The use of javabean in a servlet
I used a javabean in (scope=application) a jsp, but now I want to use that bean in my servlet, can anybody show me how?
why not share with others ??
please write out -
Hi,
I know its an easy question and probably a silly one to ask, but still please take time to answer this. Why do we use JavaBeans with JSP to make use of reusable code. Cant we use simple classes for this?
Thanks in advanceHi,
JavaBeans technology is the component architecture for the Java 2 Platform, Standard Edition (J2SE). Components (JavaBeans) are reusable software programs that you can develop and assemble easily to create sophisticated applications. By using Java beans, JSP allows you to keep much more of your code separate from the html than other html embedded languages. Java beans basically let you keep all the logic of your page (like the code to connect to a database, manipulate data etc�) in a separate file known as a Java bean. Then from within your html page - all you do is use one tag to 'use' the bean, and then a few other short tags to send data to and from the bean.
the website http://java.sun.com/products/jsp/html/jsptut.html is a good start, simple and easy understand.
Good luck!
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How to use a javaBean in a servlet without FORMS...
Hi,
I would like to use a javaBean in a Servlet.
I know how you can do this with the code
HttpSession session = request.getSession();
in your servlet.
However, by using this code you have to call the servlet by a FORM. Is it possible to call the servlet (which calls the javaBean) in your JSP file without a FORM?
Greetings
TigiThanks Anthony,
I'm working with Tigi on the same project and now I can tell you that the problem is solved.
request.getRequestDisptacher("/myServlet");hehe, you switched the 't' and the 'a'
<%@ include file="/myServlet" %>this is the one we use :)
But what is the difference between the first one and the last one? Now We are using the last one because that's the shortest :) not a pretty good reason huh :)
cheers,
Soep -
I wrote a very simple program to try to figure out how to use a javabean from multiple jsp pages. There are 2 jsps ("page1.jsp", "page2.jsp") and 1 bean ("TestBean.java"). The 1st JSP uses a bean called "myBean". It sets a value and successfully displays the value using the bean id ("myBean"). When I click the link to go to page2.jsp, however, I get a "cannot resolve symbol" error (italicized below). This error doesn't make sense to me because I set the bean to "session" scope and I never closed my browser during the session. I know I must be missing something very basic but I can't figure out what it is. Any help would be much appreciated!
C:\jakarta-tomcat-5.0.18\work\Catalina\localhost\test\org\apache\jsp\page2_jsp.java:46: cannot resolve symbol
symbol : variable myBean
location: class org.apache.jsp.page2_jsp
int beanInt = myBean.getMyInt();
^
1 error
Page1.jsp:
<jsp:useBean id="myBean" scope="session" class="test.TestBean" />
<jsp:setProperty name="myBean" property="myInt" value="99" />
<html><head> <title></title></head><body>
<% int someInt = myBean.getMyInt(); %>
<%= "someInt = " + someInt %>
<A href="page2.jsp">Continue</A>
</body></html>-----------------------------------------------------------
Page2.jsp:
<html>
<head><title></title></head><body>
<%
int beanInt = myBean.getMyInt();
%>
<%= "beanInt = " + beanInt %>
</body></html>-----------------------------------------------------------
TestBean.java:
package test;
public class TestBean {
int myInt;
public void setMyInt(int a) {
myInt = a;
public int getMyInt() {
return myInt;Yes you set your bean to session scope,
but you need to include the useBean statement on every
page you want to use that bean in scriptlet code.
<jsp:useBean id="myBean" scope="session"
class="test.TestBean" />
It worked, thanks! I have a follow-up question though:
What if I decide in "page2.jsp" to change the definiton of my useBean statement (but NOT the "id")? For example, in "page2.jsp" what would the effect be if I wrote this statement (changes only in the scope of the bean)...
<jsp:useBean id="myBean" scope="application" class="test.TestBean" />...or...
<jsp:useBean id="myBean" scope="request" class="test.TestBean" />I chose those 2 scopes since one is broader and the other is "less broad". From the small amount of testing I've done it looks like any changes in the definition of the bean cause a new bean to be created (regardless of the "id" used). Does that sound correct to you or is there more to it than this? I just want to make sure I have the concept down. And, again, thanks very much for the help. -
When i use a javabean in my jsp it doesnt find my class, I need to put anything in web.xml?? Im using Tomcat 4.0
I have beans.jsp:
<jsp:useBean id="languageBean" scope="page" class="LanguageBean">
<jsp:setProperty name="languageBean" property="*"/>
</jsp:useBean>
<html>
<head>
<title>useBean action test result</title>
And LanguageBeans.class in web-inf/classes/LanguageBean.class
what must I put in web.xml?
Thanks,
DanielHi Daniel,
1. Check ur classpath.
2. add .class to the foll code : class="LanguageBean.class" >
3. Comment out the code to check the bean's availability in the jsp code.
<jsp:setProperty name="languageBean" property="*"/>
Try to execute a method available in the LanguageBean class.
If ur still getting the error post ur bean code here and the stack trace.
Seetesh -
When toe use a JavaBean versus a taglib?
From my knowledge so far (probably basic knowledge) it appears that custom taglibs for an application could easily be used as java Beans.
I was just reading a book which gave examples of how to use tags and create your own taglib for an application. It seems that all the taglib just is used to call functions, and a bean can be used in the same way.
For example,
<%@ taglib prefix = "myQuery" uri = "..." %>
<%@ taglib prefix = "c" uri = " ... " %>
${myQuery.setId(1)} // Here to set any value really
<c:set var = "items" value="${myQuery:getItems()}" scope="application" />
My question is is this method OK to use the call to setId or should I use a Bean?
<jsp:useBean id="myQuery" class="..." >
<jsp:setProperty name="id" property="1">
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connect with databases? I read about the sql tag,
but I don't want all that stuff in my JSP page - I'd
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If I have a Bean, that has a void function in it...The key is to call the void function from some other setter or getter funtion in the bean that JSTL will call:
>
For example, I have a class which is going to connect
to a database and run queries. So, I would first
set the properties needed by the query (<c: set
target="...")Use the setter methods to store the values locally in the bean...
run the queryNot yet....
get the properties back (${someBean.someValue})This calls a Object getSomeValue() method. The first part of the getSomeValue method would be to call the 'run the query' function that connects to the database, does the SQL, etc, and returns a representation of the data. This method would then read that representation and convert it such that the web page can handle it.
<general idea in code>
private java.util.Map runQuery() {
//get values needed for the connection
makeDBConnection();
ResultSet rs = getResultsOfQuery(/*whatever params*/);
java.util.Map results = fillMapFromResultSet(rs);
return results;
public String getSomeValue() {
java.util.Map results = runQuery();
return (String) results.get("SomeValue");
}>
But how can I run the query without using a scriplet?
I read about using a taglib for that, but if I create
a separate tag and call the query function, wouldn't
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Adobe - Developer Center : Flex quick start guide for PHP
developers:
Apr 30, 2007 ... In this example, I changed the result data
type to XML with E4X support by setting .... In Flex you would
download a file using this code:
Link:
http://www.adobe.com/devnet/flex/articles/php_getstarted.html
2d. Tutorial - Flex 3 Getting Started - Adobe Learning
Resources:
See Calling XML Web Services over the Web Using the Web
Service References ... For information on integrating PHP and Flex
using AMF to encode the data,
Link:
http://learn.adobe.com/wiki/display/Flex/2d.+Tutorial
Mike Potter: Flex and PHP - A simple sample:
I have other example with PHP and MySql and give the same
error, and a example .... Flex Data Services... I choose None (???)
because I work with php and
Link:
http://blogs.adobe.com/mikepotter/2006/02/flex_and_php_a_1.html
Adobe - Developer Center : Transmitting data between Flex and
PHP:
Sep 4, 2007 ... Now that the user interface is set up and
ready to go you can add the HTTP services to go ask for the data
from the PHP code. In Flex you
Link:
http://www.adobe.com/devnet/flex/articles/flex_php_json.html
Integrating Adobe Flex and PHP:
Mar 1, 2006 ... The first step is to download Flex Builder
2.0 from the Adobe labs ... For example, you could use this same
PHP script to pass data to a
Link:
http://devzone.zend.com/article/11-Integrating-Adobe-Flex-and-PHP
Disclaimer: This response is generated automatically by the
Adobe NewsBot based on Adobe
Community
Engine. -
How to use switch statement in JSP?
Hi,
I am using switch satement in jsp.
the code as follows:
switch(flag)
case 1: query="select * from cust";
break;
case 2: query="select * from cust where minp="+mini+"and maxp="+maxi;
break;
default: query="";
out.println(query);but, i am getting some number format exception. I don't know where i am going wrong.
Please help
Regards,
AshviniI got the solution
Thanks anyways
Regards,
AShvini -
Hi all,
I am using return statement in JSP page after a redirect to stop executing that page. If the data bean is not present then it must go to previous page. When this return statement is executed the previous page is displayed but url in browser remains same. Why it is so ?. Is there any other way to tell a JSP page to stop executing and redirect to another page.
rgds
Antony PaulHi Antony,
do you use the "forward()" method or the "redirect()" method???
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How to use connection pooling in jsp?
I'm new to world of JSP. I'm developing web application using Oracle 8i and JSP to implement it. I'm using jakarta-tomcat server for this purpose.
I'll frequently access the database. so I want to use the connection pooling.
Can anybody explain the simple procedure to use it
thanxHello syyuen,
Please help me, here iam sending u my server.xml , web.xml and servlet
application. I put classes12.jar in tomcat/common/lib. and above servlet
class application under tomcat/webapps/root/web-inf/classes
and this is a simple servlet program for getting connection from the
connection pool of tomcat using tyrex..
my oracle database name is "myuser" and password is "mypass"
either u check my server.xml or tell me where under which tag should i
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other places..??
server.xml
<Server port="8005" shutdown="SHUTDOWN" debug="0">
<!-- Tomcat Stand-Alone Service -->
<Service name="Tomcat-Standalone">
<!-- Non-SSL HTTP/1.1 Connector on port 8080 -->
<Connector className="org.apache.catalina.connector.http.HttpConnector"
port="8080" minProcessors="5" maxProcessors="75"
enableLookups="true" redirectPort="8443"
acceptCount="10" debug="0" connectionTimeout="60000"/>
<!-- AJP 1.3 Connector on port 8009 -->
<Connector className="org.apache.ajp.tomcat4.Ajp13Connector"
port="8009" minProcessors="5" maxProcessors="75"
acceptCount="10" debug="0"/>
<!-- Top level container in our container hierarchy -->
<Engine name="Standalone" defaultHost="localhost" debug="0">
<!-- Global logger unless overridden at lower levels -->
<Logger className="org.apache.catalina.logger.FileLogger"
prefix="catalina_log." suffix=".txt"
timestamp="true"/>
<!-- Because this Realm is here, an instance will be shared globally
<Realm className="org.apache.catalina.realm.MemoryRealm" /> -->
<!-- Replace the above Realm with one of the following to get a Realm
stored in a database and accessed via JDBC -->
<!-- <Realm className="org.apache.catalina.realm.JDBCRealm" debug="99"
driverName="org.gjt.mm.mysql.Driver"
connectionURL="jdbc:mysql://localhost/authority?user=test;password=test"
userTable="users" userNameCol="user_name" userCredCol="user_pass"
userRoleTable="user_roles" roleNameCol="role_name" />
-->
<Realm className="org.apache.catalina.realm.JDBCRealm" debug="99"
driverName="oracle.jdbc.driver.OracleDriver"
connectionURL="jdbc:oracle:thin:@oracle:1521:ORCL"
connectionName = "mail"
connectionPassword = "mail"
userTable="users" userNameCol="user_name" userCredCol="user_pass"
userRoleTable="user_roles" roleNameCol="role_name" />
<!-- <Realm className="org.apache.catalina.realm.JDBCRealm" debug="99"
driverName="sun.jdbc.odbc.JdbcOdbcDriver"
connectionURL="jdbc:odbc:CATALINA"
userTable="users" userNameCol="user_name" userCredCol="user_pass"
userRoleTable="user_roles" roleNameCol="role_name" />
-->
<!-- Define the default virtual host -->
<Host name="localhost" debug="1" appBase="webapps" unpackWARs="true">
<Valve className="org.apache.catalina.valves.AccessLogValve"
directory="logs" prefix="localhost_access_log." suffix=".txt"
pattern="common"/>
<Logger className="org.apache.catalina.logger.FileLogger"
directory="logs" prefix="localhost_log." suffix=".txt"
timestamp="true"/>
<!-- Tomcat Root Context -->
<!-- <Context path="" docBase="ROOT" debug="0"/> -->
<!-- Tomcat Manager Context -->
<Context path="/manager" docBase="manager" debug="0" privileged="true"/>
<!-- MY CONTEXT HERE -->
<Context path="/localhost" docBase="localhost" debug="0" reloadable="false" override="true">
<Resource name="jdbc/myConnection" auth="SERVLET" type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/myConnection">
<parameter><name>user</name><value>myuser</value></parameter>
<parameter><name>password</name><value>mypass</value></parameter>
<parameter><name>driverClassName</name><value>oracle.jdbc.driver.OracleDriver</value></parameter>
<parameter>
<name>url</name>
<value>jdbc:oracle:thin:@oracle:1521:ORCL</value>
</parameter>
<parameter>
<name>maxActive</name>
<value>32</value>
</parameter>
<parameter>
<name>maxIdle</name>
<value>10</value>
</parameter>
</ResourceParams>
<!-- END OF MY Context, Oracle username=myuser,password=mypass -->
<!-- i pasted this context from somebody . should i need whole context or resource name in that...???? -->
<!-- Tomcat Examples Context
<Context path="/examples" docBase="examples" debug="0" reloadable="true" crossContext="true">
-->
<!--
<Logger className="org.apache.catalina.logger.FileLogger" prefix="localhost_examples_log." suffix=".txt" timestamp="true"/>
<Ejb name="ejb/EmplRecord" type="Entity" home="com.wombat.empl.EmployeeRecordHome" remote="com.wombat.empl.EmployeeRecord"/>
<Environment name="maxExemptions" type="java.lang.Integer" value="15"/>
<Parameter name="context.param.name" value="context.param.value" override="false"/>
<Resource name="jdbc/EmployeeAppDb" auth="SERVLET" type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/EmployeeAppDb">
<parameter><name>user</name><value>sa</value></parameter>
<parameter><name>password</name><value></value></parameter>
<parameter><name>driverClassName</name><value>org.hsql.jdbcDriver</value></parameter>
<parameter><name>driverName</name><value>jdbc:HypersonicSQL:database</value></parameter>
</ResourceParams>
<Resource name="mail/Session" auth="Container" type="javax.mail.Session"/>
<ResourceParams name="mail/Session">
<parameter>
<name>mail.smtp.host</name>
<value>localhost</value>
</parameter>
</ResourceParams>
-->
</Context>
</Host>
</Engine>
</Service>
<!-- Define an Apache-Connector Service -->
<Service name="Tomcat-Apache">
<Connector className="org.apache.catalina.connector.warp.WarpConnector"
port="8008" minProcessors="5" maxProcessors="75"
enableLookups="true" appBase="webapps"
acceptCount="10" debug="0"/>
<!-- Replace "localhost" with what your Apache "ServerName" is set to -->
<Engine className="org.apache.catalina.connector.warp.WarpEngine"
name="Apache" debug="0">
<!-- Global logger unless overridden at lower levels -->
<Logger className="org.apache.catalina.logger.FileLogger"
prefix="apache_log." suffix=".txt"
timestamp="true"/>
<!-- Because this Realm is here, an instance will be shared globally -->
<Realm className="org.apache.catalina.realm.MemoryRealm" />
</Engine>
</Service>
</Server>
web.xml
<web-app>
<servlet>
<servlet-name>conServlet</servlet-name>
<servlet-class>conServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>conServlet</servlet-name>
<url-pattern> /conServlet </url-pattern>
</servlet-mapping>
<resource-ref>
<description> Resource reference to java.sql.Connection
factory defined in server.xml
</description>
<res-ref-name>jdbc/myConnection</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
</web-app>
servlet application
DataSource ds = (DataSource) new InitialContext().lookup("java:comp/env/jdbc/myConnection");
conn = ds.getConnection();
out.println("conn : " + conn);
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Why won't my Time capsule power on after shutting itself down?
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Today when I went to repair disk permissions I noticed the top line in the drives was in red and says the the disk has a hardware problem that cannot be repaired! I repaired the disk permissions and all seems OK. The second line "macintosh HD is OK?