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Posted to users@tomcat.apache.org by Суржин Константин Вадимович <Su...@vniizht.ru> on 2015/10/27 12:45:36 UTC
jsp to servlet
Hi.
win XP.
Apache Tomcat 8.0.15
jdk8
animal.jsp (page code below)
Animal.java(page code below)
line 10 -> animalBean_0 = new org.animal.Animal();
and all right.
line 16 -> animalBean_1 = (Animal) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "Animal");
but I need a line 1 in animal.isp and I get differing code ( not new org.animal.Animal();)
and ☹
HTTP Status 500 - /animal.jsp (line: 16, column: 8) The value for the useBean class attribute Animal is invalid.
and ☹
org.apache.jasper.JasperException: java.lang.ClassNotFoundException: org.apache.jsp.animal_jsp
Maybe something is missing or incorrect on this page?? http://wiki.apache.org/tomcat/FAQ/Class_Not_Found
================
animal.jsp
================
1 <%@page import="org.animal.Animal"%>
2 <%@page language="java" contentType="text/html" pageEncoding="UTF-8"%>
3 <!DOCTYPE html>
4 <html>
5 <head>
6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
7 <title>JSP Page</title>
8 </head>
9 <body>
10 <jsp:useBean id="animalBean_0" class="org.animal.Animal" scope="session">
11 <%-- intialize bean properties --%>
12 <jsp:setProperty name="animalBean_0" property="name" value="puppy" />
13 <jsp:setProperty name="animalBean_0" property="age" value="12" />
14 </jsp:useBean>
15 Sample Bean: <%= animalBean_0%>
16 <jsp:useBean id="animalBean_1" class="Animal" scope="session">
17 <%-- intialize bean properties --%>
18 <jsp:setProperty name="animalBean_1" property="name" value="floppy" />
19 <jsp:setProperty name="animalBean_1" property="age" value="2" />
20 </jsp:useBean>
21 Sample Bean: <%= animalBean_1%>
22 </body>
23 </html>
==================
Animal.java
==================
package org.animal;
public class Animal {
private String name = "no name";
private Integer age = 0;
public Animal(){
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
@Override
public String toString() {
return "Animal [name=" + name + ", age=" + age + "]";
}
}
Re: jsp to servlet
Posted by Christopher Schultz <ch...@christopherschultz.net>.
On 10/28/15 4:27 AM, Суржин Константин Вадимович wrote:
>> You are asking for a bean with the class name "Animal", and the JSP compiler and/or runtime >can't find it. I'm guessing you meant to use "org.animal.Animal" here?
>
> <jsp:useBean id="animalBean_1" class="org.animal.Animal" scope="session">
>
> JSP compiler produce next servlet code:
> org.animal.Animal animalBean_1 = new org.animal.Animal();
>
> It's OK without import directive.
>
> Or
>
> <%@page import="org.animal.Animal"%>
> <jsp:useBean id="animalBean_1" type="Animal" beanName="org.animal.Animal" scope="session">
>
> JSP compiler produce next servlet code:
> Animal animalBean_1 = (Animal) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "org.animal.Animal");
>
> And (ClassLoader) the JSP compiler and/or runtime can find Animal.class
>
> But:
> <%@page import="org.animal.Animal"%>
> <jsp:useBean id="animalBean_1" class="Animal" scope="session">
>
> But in this case JSP compiler produce of different servlet code
> Animal animalBean_1 = (Animal) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "Animal");
>
> The method instantiate(...,...) does not have a fully qualified name of Animal and It's does not work.
>
> And (ClassLoader) the JSP compiler and/or runtime TomCat or GlassFish can't find Animal class in /WEB-INF/classes/org/animal/
>
> So, directive <%@page import="org.animal.Animal"%> has no effect here and
> beanName="" or class="" org.animal.Animal" cannot be short.
> Only fully qualified class name acceptable.
> Maybe it's a bug.
No, it's not:
http://www.oracle.com/technetwork/java/syntaxref12-149806.pdf
The spec for <jsp:useBean> is that both "type" and "class" attributes
should be specified as "package.Class" and not "Class" with an import. I
think the package name is required, regardless of any page imports.
> But FAQ writes:
> ======================
> Make sure:
>
> Your bean is packaged in a class.
> You have fully qualified your class name (e.g.: com.bar.package.MyClass ) OR
> You have imported your class into your jsp (e.g.: <%@ page import="com.bar.package.MyClass"%> )
You don't need to import the class at all if you are always using
<jsp:useBean>.
> =======================
>
>> Or do you have a class, Animal, in the default package?
>
> package org.animal;
> public class Animal {...}
Don't use the default package for anything: it's just a recipe for
confusion.
-chris
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RE: jsp to servlet
Posted by Суржин Константин Вадимович <Su...@vniizht.ru>.
>You are asking for a bean with the class name "Animal", and the JSP compiler and/or runtime >can't find it. I'm guessing you meant to use "org.animal.Animal" here?
<jsp:useBean id="animalBean_1" class="org.animal.Animal" scope="session">
JSP compiler produce next servlet code:
org.animal.Animal animalBean_1 = new org.animal.Animal();
It's OK without import directive.
Or
<%@page import="org.animal.Animal"%>
<jsp:useBean id="animalBean_1" type="Animal" beanName="org.animal.Animal" scope="session">
JSP compiler produce next servlet code:
Animal animalBean_1 = (Animal) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "org.animal.Animal");
And (ClassLoader) the JSP compiler and/or runtime can find Animal.class
But:
<%@page import="org.animal.Animal"%>
<jsp:useBean id="animalBean_1" class="Animal" scope="session">
But in this case JSP compiler produce of different servlet code
Animal animalBean_1 = (Animal) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "Animal");
The method instantiate(...,...) does not have a fully qualified name of Animal and It's does not work.
And (ClassLoader) the JSP compiler and/or runtime TomCat or GlassFish can't find Animal class in /WEB-INF/classes/org/animal/
So, directive <%@page import="org.animal.Animal"%> has no effect here and
beanName="" or class="" org.animal.Animal" cannot be short.
Only fully qualified class name acceptable.
Maybe it's a bug.
But FAQ writes:
======================
Make sure:
Your bean is packaged in a class.
You have fully qualified your class name (e.g.: com.bar.package.MyClass ) OR
You have imported your class into your jsp (e.g.: <%@ page import="com.bar.package.MyClass"%> )
=======================
> Or do you have a class, Animal, in the default package?
package org.animal;
public class Animal {...}
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Re: jsp to servlet
Posted by Christopher Schultz <ch...@christopherschultz.net>.
Суржин,
On 10/27/15 7:45 AM, Суржин Константин Вадимович wrote:
> Hi.
> win XP.
> Apache Tomcat 8.0.15
> jdk8
> animal.jsp (page code below)
> Animal.java(page code below)
>
> line 10 -> animalBean_0 = new org.animal.Animal();
> and all right.
>
> line 16 -> animalBean_1 = (Animal) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "Animal");
> but I need a line 1 in animal.isp and I get differing code ( not new org.animal.Animal();)
> and ☹
> HTTP Status 500 - /animal.jsp (line: 16, column: 8) The value for the useBean class attribute Animal is invalid.
> and ☹
> org.apache.jasper.JasperException: java.lang.ClassNotFoundException: org.apache.jsp.animal_jsp
>
> Maybe something is missing or incorrect on this page?? http://wiki.apache.org/tomcat/FAQ/Class_Not_Found
You are asking for a bean with the class name "Animal", and the JSP
compiler and/or runtime can't find it. I'm guessing you meant to use
"org.animal.Animal" here?
Or do you have a class, Animal, in the default package?
-chris
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