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JSP, Tomcat, Classpath Error

Elton Hughes
Ranch Hand

Joined: Jun 19, 2003
Posts: 72
Hello All,

I am trying to learn about JSP and I am doing the exercises in the book "Beginning JSP2" from Apress. Until the last exercise, things were going well.

Here is what I am using:
Mac OS X 10.4.6
Tomcat 5.0.28
MySQL 5.0.16
MySQL ConnectorJ 3.1.13

Here is the latest script:

<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core_rt" %>
<%@ taglib prefix="sql" uri="http://java.sun.com/jstl/sql_rt" %>

<sql:setDataSource var="datasource"
driver="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost/publish"
user="publishuser" password="XXXXXXXXXX"/>

<sql:query var="books" dataSource="${datasource}">
SELECT id, title, price FROM book
</sql:query>

<html>
<head>
<title>JSP gateway to the Publish Database</title>
</head>

<body>
<table border="1">
<tr>
<td>id</td>
<td>title</td>
<td>price</td>
</tr>

<c:forEach items="${books.rows}" var="row">

<tr>
<td><cut value="${row.id}" /></td>
<td><cut value="${row.title}" /></td>
<td><cut value="${row.price}" /></td>
</tr>

</c:forEach>

</table>
</body>
</html>

Unfortunately, I am getting this error message and I do not understand what it is saying. The message is:

javax.servlet.ServletException: org/aspectj/lang/Signature
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
org.apache.jsp.bookList_jsp._jspService(bookList_jsp.java:80)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

java.lang.NoClassDefFoundError: org/aspectj/lang/Signature
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Class.java:242)
org.apache.taglibs.standard.tag.common.sql.DataSourceWrapper.setDriverClassName(DataSourceWrapper.java:46)
org.apache.taglibs.standard.tag.common.sql.SetDataSourceTagSupport.doStartTag(SetDataSourceTagSupport.java:102)
org.apache.jsp.bookList_jsp._jspx_meth_sql_setDataSource_0(bookList_jsp.java:100)
org.apache.jsp.bookList_jsp._jspService(bookList_jsp.java:64)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

It looks like a class is missing. But the instructions only called for the mysql connector jar to go into the WEB-INF/lib directory, so I am at a loss as to what to do next.

Thank you for your time.

Elton
Bear Bibeault
Author and ninkuma
Marshal

Joined: Jan 10, 2002
Posts: 61648
    
  67

Indeed, it means that the org.aspectj.lang.Signature class is missing from the classpath. You'll need to track down where you need to et it from.

But....

You said:

Tomcat 5.0.28


and


<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core_rt" %>
<%@ taglib prefix="sql" uri="http://java.sun.com/jstl/sql_rt" %>


which means you are using JSTL 1.0 with Tomcat 5.

These are not compatible and will cause you future problems.

If you are using Tomcat 5, you should be sure that your web.xml is declared as a Servlets 2.4 web app, and you should be using JSTL 1.1.

The JSP FAQ has more details.


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Elton Hughes
Ranch Hand

Joined: Jun 19, 2003
Posts: 72
Hi Bear,

Thank you for pointing that out. As someone who is learning from a book, I can only assume the authors had a good reason for mixing things up. The book I am learning from earned 8 horseshoes.

What should the taglib lines be?

Thanks,

Elton
Bear Bibeault
Author and ninkuma
Marshal

Joined: Jan 10, 2002
Posts: 61648
    
  67

http://java.sun.com/jsp/jstl/core

This assumes you have installed the JSTL 1.1 jars.
Stefan Evans
Bartender

Joined: Jul 06, 2005
Posts: 1018
The aspectj issue is coming from the MySQL driver I believe.
Maybe you have a "test" build of it?
Check that you have the right driver installed.

A related post on the mysql forums.
http://forums.mysql.com/read.php?39,22579,33723#msg-33723
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: JSP, Tomcat, Classpath Error