You said that you compiled a file called Bean.java. However, you are using
"Bean1" as the class name in the jsp:useBean command. Try changing it to
"Bean".
Janavee Boda <[EMAIL PROTECTED]> on 01/12/2001 03:17:18 PM
Please respond to A mailing list about Java Server Pages specification and
reference <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
cc: (bcc: Mark Brown/IT/Aon Consulting)
Subject: Jsp and JavaBeans
Hello Everybody,
I have one question in putting Jsp and JavaBeans together. Here i'm
providing complete details of my doubt.
I'm using ApacheWebServer and Tomcat Container3.2.
I have defined my own context path. which is "/boda" for "webapps/boda"
Under boda directory, i have web-inf, meta-inf, jsp subdirectories.
Under web-inf i have classes directory.
I have a Bean.java file in classes directory.
and my BeanTest.jsp is in tomcat\webapps\boda\jsp.
In Bean.java, i have on getter, one setter method , one accessor and one
property.
In BeanTest.jsp, i'm trying to pull the info from Bean.class.
I compiled the Bean.java and placed the class file in
tomcat\webapps\boda\web-inf\classes.
Here are my problems. (look at the end for BeanTest.jsp file)
when i'm accessing BeanTest.jsp, i'm getting the following error.
-------------------------
Error: 500
Location: /boda/jsp/BeanTest.jsp
Internal Servlet Error:
org.apache.jasper.JasperException: Unable to compile class for JSP
at org.apache.jasper.servlet.JspServlet.doLoadJSP(JspServlet.java:476)
at
org.apache.jasper.servlet.JasperLoader12.loadJSP(JasperLoader12.java:146)
at org.apache.jasper.servlet.JspServlet.loadJSP(JspServlet.java:433)
at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadIfNecessary(JspServlet.java:152)
at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:164)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:318)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:391)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
at org.apache.tomcat.core.Handler.service(Handler.java:286)
at
org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
at
org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:210)
at
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
at
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
at java.lang.Thread.run(Unknown Source)
Root cause:
java.lang.NullPointerException
at
org.apache.jasper.compiler.GetPropertyGenerator.generate(GetPropertyGenerator.java:100)
at
org.apache.jasper.compiler.JspParseEventListener$GeneratorWrapper.generate(JspParseEventListener.java:773)
at
org.apache.jasper.compiler.JspParseEventListener.generateAll(JspParseEventListener.java:220)
at
org.apache.jasper.compiler.JspParseEventListener.endPageProcessing(JspParseEventListener.java:175)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:183)
at org.apache.jasper.servlet.JspServlet.doLoadJSP(JspServlet.java:462)
at
org.apache.jasper.servlet.JasperLoader12.loadJSP(JasperLoader12.java:146)
at org.apache.jasper.servlet.JspServlet.loadJSP(JspServlet.java:433)
at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadIfNecessary(JspServlet.java:152)
at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:164)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:318)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:391)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
at org.apache.tomcat.core.Handler.service(Handler.java:286)
at
org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
at
org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:210)
at
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
at
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
at java.lang.Thread.run(Unknown Source)
------------------------
BeanTest.jsp: (delete the comment tags before and after the html tags)
<!--
<html>
<body>
<!-- Find and instantiate the bean, and refer to it as myBean -->
<%@ page language="java" %>
<jsp:useBean id="myBean" scope="page" class="Bean1"/>
STEP-1 : Use the bean's default property "World" <br>
Hello there, <%= myBean.getName() %><br>
Hi there, <jsp:getProperty name="myBean" property="name" /> <br>
howdy, <%=myBean.makeMeBig()%><br><br>
STEP-2 : Set the name property to "Sam" , using jsp:setProperty
value="Sam"<br>
<jsp:setProperty name="myBean" property="name" value="Sam" /><br><br>
STEP-3 : Use the bean's new property "Sam" <br>
Hello there, <%=myBean.getName() %> <br>
Hi there, <jsp:getProperty name="myBean" property="name" /> <br>
Howdy,<%=myBean.makeMeBig() %> <br><br>
STEP-4 : Set the name property to "Bernie", using setName() value="Bernie"
<br>
<%=myBean.setName("Bernie") %> <br>
STEP-5 : Use the bean's new property"Bernie"<br>
Hello there, <%=myBean.getName() %><br>
Hi there, <jsp:getProperty name="myBean" property="name" /><br>
Howdy, <%=myBean.makeMeBig() %> <br><br>
STEP-6 : Set the name property from the query string , using jsp:setProperty
param="name" <br>
<jsp:setProperty name="myBean" property="name" param="name" /> <br>
STEP-7 : Use the bean's new property from URL<br>
Hello there, <%=myBean.getName() %><br>
Hi there, <jsp:getProperty name="myBean" property="name" /><br>
Howdy, <%=myBean.makeMeBig() %> <br><br>
</body>
</html>
-->
Please help me. I'm in learning stage.
Thanks in advance,
Janvi.
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For digest: mailto [EMAIL PROTECTED] with body: "set JSP-INTEREST DIGEST".
Some relevant FAQs on JSP/Servlets can be found at:
http://java.sun.com/products/jsp/faq.html
http://www.esperanto.org.nz/jsp/jspfaq.html
http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
