usebean « Bean « JSP-Servlet Q&A

2. jsp:useBean usage

Marco I'm not a jsp or bean expert but if I understand your question correctly you want to know why to use a bean instead of a regular class. To be a bean a class meets certain specific requirments, such as accessor methods, that may or may not be in another class. Because of this you can use things like this: ...

3. UseBean

When you get an object as a bean you can use all of the getProperty and setProperty methods. Those will not work with a normal class instance you would get from another tag. Also by creating a bean and conforming to all of the required rules you have a much better chance of creating somehtng that is truely a reusable component ...

4. Basic useBean question

5. Using The UseBean from Jsp

Hi! Friends, I have a jsp page using the property and have a BeanClass . Also i have the package etc. I have placed the jsp file in Jsp folder and the BeanClass in pakage. Tomcat gives me the following error:- org.apache.jasper.JasperException: Unable to compile class for JSP C:\jtomcat\work\Standalone\localhost\zz\jsp\numguess$ Class num.NumberGuessBean not found in import. import num.NumberGuessBean; ^ 1 error ...

6. Problems with jsp:useBean

7. Jsp:useBean Problem

8. Problems with jsp:useBean

9. jsp:useBean question

10. UseBean

11. conditional usebean

im trying to do the folowing in my jsp but i get errors when i try to access the beans i.e underfined variable or class name myContentManagerUpdateBean (i get this error even if bnId is not null) any ideas. thanks in advance. <% if (request.getParameter("bnId") != null) { %> <% myContentManagerUpdateBean.contentFullDetailsFromDB(); } else { ...

12. Simple jsp:useBean question

13. jsp:useBean

In order to access class B, you can do any of the following: 1.) instantiate class B as a Bean (i.e. jsp:useBean) 2.) instantiate an instance of class B in your jsp page 3.) use composition (i.e. class A maintains an instance member of type class B) If you use scheme 1, you can access class B by using getAttribute and ...

14. Difference between jsp:useBean and ....

Theoretically speaking, is there any difference as far as object resources is concern, when you extend or import a class(bean) and using that class(bean) as bean by The only thing differ is the syntax of course but for using it as the objects resources is the same. Am I making sense? Thanks.

15. jsp:usebean and Maps

16. jsp usebean sharing issues

Hi, I am using a bean called productTransfer in two different JSP's: JSP 1: JSP 2: While I am still in the same session, if I first use JSP 1 and then use JSP 2 after that, will my instance of productTransfer (invTransfer) be the same as the instance used in JSP 1 ...

17. setting classpath for 'jsp:useBean'

19. jsp:useBean ClassCastException

I have a jsp where I use jsp:useBean. I only get the exception in the JSP after I try to update the bean in the session data (in a struts action class). Should beans only be read only, set up once never to be changed ? I am getting this error on Jrun4. If I initialize the bean with some initial ...

20. UseBean

Hi, i have a jsp where i have 2 combo boxes and a button. On selection of the values from the 2 combo boxes and after clicking on 'go' the page should display a list which fulfills the above criteria. how do i do it?? for eg. One combo-box contains codes and the other contains the range. so once the user ...

21. using jsp:useBean

Hi, I am trying to put some properties from a JavaBean (user) into the session scope after the user logs in. This is done via authentication. I am sure that my JavaBean is written properly and that all the properties I want to put in the scope are there. The problem I have is that for some rezone when I try ...

22. how to use usebean

23. jsp:useBean

Hi, I'm making a cd store web app where my index is in jsp. Within this index page I have another jsp page included that is only to contain the categories of music genres which are stored on my database. What I want to do is be able to use the jsp:useBean and have the bean read from the database and ...

24. How to use Java Application in jsp:useBean

Originally posted by ramprasad madathil: By the way, what Adeel meant when he said 'No' to your first post was that the syntax of the useBean tag does not give you an easy way to invoke methods (other than the get and set methods) on the bean. You would have to do it the scriptlet way as you have posted subsequently. ...

25. useBean

26. Doubt: jsp:useBean

27. jsp:usebean

28. JSP usebean

29. Problem in usebean

hi i am developing a application in jsp. & i am getting an error in tomcat server on using usebean org.apache.jasper.JasperException: Unable to compile class for JSP An error occurred at line: 36 in the jsp file: /tool/tool.jsp Generated servlet error: tool.connection.SqlConnect cannot be resolved or is not a type An error occurred at line: 36 in the jsp file: /tool/tool.jsp ...

30. problem in usebean

31. Again problem in usebean

32. useBean

33. bean vs jsp:useBean problem

Hi all, I have a little problem that I'd like to resolve just for my own gratification. A have a simple class as follows: package beans; public class hellobean { private String name = "world"; public void setName (String name) { = name; } public String getName() { return name; } } As you can see it's a no big ...

34. useBean problem

35. A jsp:useBean question

36. jsp usebean question

37. Regarding jsp:useBean

38. about jsp:useBean

39. Convention for placement of jsp:useBean

40. usebean

41. jsp:useBean

42. jsp:useBean

43. jsp:useBean InstantiationException

44. jsp:usebean

45. Jsp:useBean

46. JSP:usebean

47. useBean

48. jsp:useBean

Can I use nested in other wordrs one in another. if yes what suould we do when a top side bean's scope is session and inside benas scope page. does it mean once session is timed-out page scoped variable also go invisible? regards, rahul [ November 08, 2006: Message edited by: Rauhl Roy ]

49. a big doubt on jsp:useBean

Hi guys....could you please help me out with's not mentioned in the errata list for HFSJ....The 12th bullet on Page 414 point says --If you specify a "type" attribute in , you can set properties in ONLY on properties of the "type", but NOT on properties that exist only in the actual "class" type.(In other words, polymorphism and normal ...

50. usebean problem newbie

51. jsp:usebean -- need info

52. jsp:useBean doubt

53. Problem with using jsp:useBean

Hey Merrill, I tried that too, I am getting an InstatntiationException, the stack trace is as below javax.servlet.ServletException: class com.sapmarkets.isa.catalog.webcatalog.WebCatArea : java.lang.InstantiationException: com.sapmarkets.isa.catalog.webcatalog.WebCatArea at org.apache.jasper.runtime.PageContextImpl.handlePageException( at org.apache.jsp.catalog.ProductDetailB2C_jsp._jspService( at org.apache.jasper.runtime.HttpJspBase.service( at javax.servlet.http.HttpServlet.service( at org.apache.jasper.servlet.JspServletWrapper.service( at org.apache.jasper.servlet.JspServlet.serviceJspFile( at org.apache.jasper.servlet.JspServlet.service( at javax.servlet.http.HttpServlet.service( at org.apache.catalina.core.ApplicationDispatcher.invoke( at org.apache.catalina.core.ApplicationDispatcher.doForward( at org.apache.catalina.core.ApplicationDispatcher.forward( at org.apache.struts.action.ActionServlet.processActionForward( at com.sapmarkets.isa.core.ActionServlet.processActionForward( at org.apache.struts.action.ActionServlet.process( at com.sapmarkets.isa.core.ActionServlet.process( at org.apache.struts.action.ActionServlet.doPost( at javax.servlet.http.HttpServlet.service( at javax.servlet.http.HttpServlet.service( at org.apache.catalina.core.ApplicationDispatcher.invoke( ...

54. jsp:useBean help is required

55. Doubt in jsp:useBean

56. jsp:usebean | NoClassDefFoundError

57. About jsp:useBean

hi all, i am using jsp:usebean in my jsp page.but Bean class is abstract. when i try to use this Exception is coming..i know it will works fine for non-abstract class.. for abstract class we have to mention "type" attribute insteadof class in usebean.i tried this also..but i am getting "bean must exist ...

58. jsp:useBean doubt

hi guys, i want to develop an website using jsp. actually i am using the javascript for actions in my page. but i am facing a problem with Internetexplorer what it is my javascript code supports only on IE not in i want to change the code in jsp:usebean there any possible to devlop in jsp:usebean. what my requirement ...

59. jsp:useBean and generic type?

60. usebean doubt

61. problem in useBean

62. Doubt in working of jsp:useBean

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <%@ page import="*,java.util.*,org.omkar.swajsp.dao.*,org.omkar.swajsp.vo.*"%> Welcome to SWA_JSP <% InputStream inputStream2 = application .getResourceAsStream("WEB-INF/classes/org/omkar/swajsp/resources/"); Properties properties = new Properties(); properties.load(inputStream2); String databaseName = properties.getProperty("databaseName"); String databaseUsername = properties .getProperty("databaseUserName"); String databasePassword = properties .getProperty("databasePassword"); String jdbcDriverName = properties.getProperty("jdbcDriverName"); String jdbcConnectionString = properties ...

63. jsp usebean

64. Regarding useBean

65. "jsp:usebean" question

I define a bean in first.jsp using "jsp:usebean" with "scope=session" and populate all fields in bean. I then forward to second.jsp which makes no reference to bean created in first.jsp. Then second.jsp forwards to third.jsp, which has "jsp:usebean" defined for the bean created in first.jsp. I lost all of the values which were populated from first.jsp. I thought that as long ...

66. Problem with jsp:useBean

67. problem with jsp:useBean ...Pl help

68. jsp:usebean

69. where to place beans for jsp:useBean

70. jsp:usebean

Well here is the code for the html(beans.html) useBean action test result

useBean action test result

Hello, .

Your favourite language is .

My comments on your language:

Code :beans.jsp ...

72. Test 498 question relating to jsp:useBean

The jsp:useBean action looks for a named instance in the specified scope and if it is isn't there, it creates it. This means that answer (c) will try to find a bean called appInfo on the page. However, the startup process initialises the JavaBean and binds this into the servlet context. This is (if you like) a global area for the ...

73. Is this legal in jsp:useBean...

74. Using jsp:useBean for a bean with one argument constructor

Hi Celina, from what I have experienced it seems that at least Tomcat requires that the class have a default constructor (e.g. a non-argument constructor). I think the definition of what a java-bean is also states that there must exist a default constructor for the class. To handle the problem you can do a work-around where you demand that jsp-pages which ...

75. Pissy jsp:usebean

First, this really pisses me off and I was hoping some people could check out the behavior on other JSP implementations. I'm running Tomcat 3.2.1 This might be documented somewhere and I admit I haven't looked everywhere, but it seems so fundamental that it should be mentioned somewhere IN BOLD. Ok, here is the meat of the matter. You are ...

76. JSP & useBean

Hi All, Something does not feel right here !! I declared a bean with the useBean tag and gave it a scope of request. I then use the bean in my jsp file and set up the values manually like this.... <% foo.setName = "abc"; ... ... %> At the end the user is allowed to ...

77. useBean-like bean instantiation behavior from a Servlet?

Certainly I could, however the same argument could be made for useBean in JSPs... but it's a handy concise construct for mapping from an HTML form to Java bean. Changes to the Java bean do not require corresponding servlet changes (specifically: adding new properties). And I'm hoping to have those same benefits in a servlet. I'll note that I found it ...

80.  conditional body

82. deserilize using usebean

84. JSP polymorphism problem in

85.  example

86. jsp usebean

87. why use ?

88. Advantages of UseBean

89. Using jsp:useBean across JSPs

Hi all, I have a problem with 3 JSPs, say A.jsp and B.jsp and A.jsp includes B.jsp A uses a useBean named 'userinfo' which is picked from the session initialized in C.jsp. If I directly access A.jsp everything works fine. Heres the problem: I have to access both A(B included) and B separately. If I try to access B.jsp which expects ...

90. JSP useBean Question

91.  and coding