Problem Hibernate 3.2.0 tutorial on tomcat-5.5.17

KeesVanElst · **Joined:** Wed Apr 18, 2007 8:39 am **Posts:** 4

Hi, I'm a newbie on Hibernate and got to the end of the tutorial when I had to deploy the resulting war file on Tomcat and trouble began (Tc does work with other apps). Whatever I try I see one of these two exceptions

javax.servlet.ServletException: Servlet execution threw an exception
root cause
java.lang.ExceptionInInitializerError
util.HibernateUtil.<clinit>(Unknown Source)
events.EventManagerServlet.doGet(Unknown Source)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

or

javax.servlet.ServletException: Servlet execution threw an exception
java.lang.NoClassDefFoundError
events.EventManagerServlet.doGet(Unknown Source)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

Now the directory structure of my project is:

C:\HibernateTutorial>
│ build.xml
│ log4j.properties
│ web.xml
├───data
├───lib
│ antlr-2.7.6.jar
│ asm-attrs.jar
│ asm.jar
│ cglib-2.1.3.jar
│ commons-collections-2.1.1.jar
│ commons-logging-1.0.4.jar
│ dom4j-1.6.1.jar
│ hibernate3.jar
│ hsqldb.jar
│ jboss-cache.jar
│ jsp-api.jar
│ jsse.jar
│ jta.jar
│ log4j-1.2.11.jar
│ mysql-connector-java-3.0.17-ga-bin.jar
│ readme.txt
└───src
│ hibernate.cfg.xml
├───events
│ Event.hbm.xml
│ Event.java
│ EventManager.java
│ EventManagerServlet.java
│ Person.hbm.xml
│ Person.java
└───util
HibernateUtil.java

Changes I made while testing: I changed <hibernate-mapping> in hbm.xml files into <hibernate-mapping package="events">, I added jboss-cache.jar to lib, changed log4j.properties into version with log4j.rootLogger=debug, stdout, and after deploying war file on Tomcat added copy of log4j.properties to C:\tc5\webapps\hibernate-tutorial\WEB-INF\classes.

CLASSPATH = .;C:\tc5\common\lib\servlet-api.jar;C:\tc5\common\lib\jsp-api.jar;C:\Servlets+JSP;C:\mysqcon\mysql-connector-java-3.0.17-ga-bin.jar;

ANT_HOME = C:\apache-ant-1.6.5

CATALINA_HOME = C:\tc5

JAVA_HOME = C:\Program Files\Java\jdk1.5.0_11

Path = %SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;C:\Program Files\MySQL\MySQL Server 4.1\bin;C:\apache-ant-1.6.5\bin;C:\Program Files\Java\jdk1.5.0_11\bin";%PATH%

I'm slightly going nuts here.
Can somebody PLEASE help me out?
Cheers
Kees

christian · **Posted:** Wed Apr 18, 2007 11:36 am

Why don't you use the WORKING source that comes with the tutorial and compare it to yours?

KeesVanElst · **Joined:** Wed Apr 18, 2007 8:39 am **Posts:** 4

christian wrote:

Why don't you use the WORKING source that comes with the tutorial and compare it to yours?

I'll do that, thanks. After a day of trial and error you can miss the obvious ;)
I'll post the results here.
Cheers,
Kees

KeesVanElst · **Joined:** Wed Apr 18, 2007 8:39 am **Posts:** 4

Well that wasn't very helpful unfortunately: the lib directory totally empty, web.xml lacking, and no further hints on configuration issues. After all not so obvious as one might think.
Anyone who succesfully deployed war file and run hibernate-tutorial demo-application from hibernate-3.2.0?

christian · **Posted:** Thu Apr 19, 2007 5:07 am

There was a mistake in the Hibernate build, the web.xml was not included. It's in SVN and very very trivial:

Code:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

    <servlet>
        <servlet-name>Event Manager</servlet-name>
        <servlet-class>events.EventManagerServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>Event Manager</servlet-name>
        <url-pattern>/eventmanager</url-pattern>
    </servlet-mapping>
</web-app>

There is nothing else to configure. Of course the lib directory is empty, because we don't package the same libraries twice. Read the readme.txt in that directory.

KeesVanElst · **Joined:** Wed Apr 18, 2007 8:39 am **Posts:** 4

Hi Christian,
That web.xml was identical to the one I got from the tutorial.html.
After that I decided to compare code in source files and discovered some differences

1. in Event.hbm.xml: I had the
<set name="participants" table="PERSON_EVENT" inverse="true">
outside the <class name="events.Event" table="EVENTS"> declaration

2. Event.java: I had setParticipants(Set participants) as protected method i.o. public (while tutorial.html declares it as private...)

3. EventManager.java: I didn't have org.hibernate.criterion.Expression imported and the tutorial.html didn't mention adding a main attribute "addemailtoperson" so I erroniously concluded it was meant for Person.java

After compiling the revised version into war file and deploying it I first got a TransactionException which was caused by not having started HSQLDB.

Finally got it working.
The tutorial.html is really great (looks like it got copied partly into the book Java Persistance with Hibernate) but description is not 100% exact so it takes some trial and error and support to get it running.
Thanks for your time!
Kees