Hibernate Tutorial - Fix 1 of 6 - Missing Version Information In The POM

I tried to follow the Hibernate Tutorial posted on official Hibernate site. Here is the link to the tutorial. I was using Apache Maven version 2.2.1 and I had to make a lot of modifications to the tutorial code (specially in pom.xml) to make it work. I want to post these fixes/code updates and maybe it might help someone who is having problems walking through the tutorial.

There were so many issues and the post was getting big so I am splitting it into different posts. you can skip reading the 'preface' section of the other posts in this series.

Problem 1 of 6:
Missing version information in the pom.xml

I started the tutorial to go back to basics and brush-up on my hibernate knowledge, and I was really excited about learning Maven in the process. Just a few steps into the tutorial (section 1.1.5), I was trying to compile using the maven command:

mvn compile

And I hit my first road-block - I was getting the following error:

[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Error building POM (may not be this project's POM).


Project ID: org.hibernate.tutorials:hibernate-tutorial
POM Location: C:\Users\Krishna\workspace\hibernate\pom.xml
Validation Messages:

    [0]  'dependencies.dependency.version' is missing for org.hibernate:hibernate-core:jar
    [1]  'dependencies.dependency.version' is missing for javax.servlet:servlet-api:jar
    [2]  'dependencies.dependency.version' is missing for org.slf4j:slf4j-simple:jar
    [3]  'dependencies.dependency.version' is missing for javassist:javassist:jar


Reason: Failed to validate POM for project org.hibernate.tutorials:hibernate-tutorial at C:\Users\Krishna\workspace\hibernate\pom.xml


[INFO] ------------------------------------------------------------------------
[INFO] Trace
org.apache.maven.reactor.MavenExecutionException: Failed to validate POM for project org.hibernate.tutorials:hibernate-tutorial at C:\Users\Krishna\workspace\hibernate\pom.xml
 at org.apache.maven.DefaultMaven.getProjects(DefaultMaven.java:404)
 at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:272)
 at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
 at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
 at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
 at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
 at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
 at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: org.apache.maven.project.InvalidProjectModelException: Failed to validate POM for project org.hibernate.tutorials:hibernate-tutorial at C:\Users\Krishna\workspace\hibernate\pom.xml
 at org.apache.maven.project.DefaultMavenProjectBuilder.processProjectLogic(DefaultMavenProjectBuilder.java:1077)
 at org.apache.maven.project.DefaultMavenProjectBuilder.buildInternal(DefaultMavenProjectBuilder.java:880)
 at org.apache.maven.project.DefaultMavenProjectBuilder.buildFromSourceFileInternal(DefaultMavenProjectBuilder.java:508)
 at org.apache.maven.project.DefaultMavenProjectBuilder.build(DefaultMavenProjectBuilder.java:200)
 at org.apache.maven.DefaultMaven.getProject(DefaultMaven.java:604)
 at org.apache.maven.DefaultMaven.collectProjects(DefaultMaven.java:487)
 at org.apache.maven.DefaultMaven.getProjects(DefaultMaven.java:391)
 ... 12 more
[INFO] ------------------------------------------------------------------------
[INFO] Total time: < 1 second
[INFO] Finished at: Tue May 11 15:18:01 PDT 2010
[INFO] Final Memory: 1M/15M
[INFO] ------------------------------------------------------------------------

I fixed it by adding the necessary version information. Here is the updated pom.xml

  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  4.0.0
  org.hibernate.tutorials
  hibernate-tutorial
  1.0-SNAPSHOT
  First hibernate tutorials
  
     ${artifactId}
  
  
     
        org.hibernate
        hibernate-core
        3.3.1.GA
     
     
      javax.servlet
      servlet-api
          [2.4,)       
     
     
        org.slf4j
        slf4j-simple
        1.5.6
     
     
        javassist
        javassist
        [3.0,)
     
    
      junit
      junit
      3.8.1
      test