SYS-CON MEDIA Authors: Pat Romanski, Gary Arora, Zakia Bouachraoui, Yeshim Deniz, Liz McMillan

Blog Feed Post

How I Created a Standard pom.xml file for Eclipse and NetBeans

After building my environment for JavaServer Faces in the Eclipse IDE it was time to move onto NetBeans. It should be simple, I thought. I was very, very wrong.

NetBeans Step 1

Create a new project for Maven->Web Application. Fill in the usual details about the Maven project. When complete and the project appears immediately edit the pom.xml file and replace the section that starts with <dependencies> until the end with the contents from my pom.xml file from my previous blog posts.

At this point the project is ready for you to write your code. Or so I thought . . .

NetBeans revealed a flaw in my pom.xml file. In Eclipse the classpath of a Maven project includes the server’s library. This makes the TomEE lib folder’s jar files available to Eclipse. This is not the case with NetBeans. When it handles a Maven based project it expects all references to libraries to be declared in the pom.xml only. The ability to add libraries to a project through the IDE is removed.

When I began working on this project  I was looking for a Maven dependency that referred to the TomEE libraries and not the Java EE 6 Oracle libraries. So the following dependency refers to the wrong version of the libraries.

<dependency>
   <groupId>javax</groupId>
   <artifactId>javaee-web-api</artifactId>
   <version>6.0</version>
   <scope>provided</scope>
</dependency>

Here is where I made one of many mistakes. I believed that the Maven TomEE plugin provided the correct libraries. So I placed in my pom.xml file:

<dependency>
   <groupId>org.apache.openejb.maven</groupId>
   <artifactId>tomee-maven-plugin</artifactId>
   <version>1.6.0</version>
   <scope>provided</scope>
</dependency>

This plugin has nothing to do with TomEE libraries. Instead its purpose is to allow a Maven pom.xml to be written that could, as listed on the TomEE maven Plugin page, do the following:

  • easy provisioning of a TomEE server
  • server start and stop
  • application deploy and undeploy

I did not notice the problem in Eclipse because it saw the TomEE libraries but when I tried to write a Facelet template file with NetBeans it reported that there was No Faces library in the classpath. So back to Google I went.

I found a blog entitled Developing Java EE 6 Applications With TomEE and NetBeans. It created a project by using an archetype. It showed how to add an archetype to Netbeans. It used the tomee-webapp-archetype.

The issue that I have with archetypes is that I must tell my students to delete or ignore parts of the project they create. When I used Maven in the classroom with Eclipse last term I used the maven-archetype-quickstart. Most of my students were confused by the generated files and chose to leave them in place unchanged. Most of my students’ projects displayed “Hello World!” in the console when run because they would not change the App.java file. Now I plan to start projects without an archetype.

What I was really interested in was the pom.xml file it created. It contained the dependency I was looking for that referenced the library used by TomEE:

<dependency>
   <groupId>org.apache.openejb</groupId>
   <artifactId>javaee-api</artifactId>
   <version>6.0-5</version>
   <scope>provided</scope>
</dependency>

It also included a plugin for the JPA. Great, now for some testing.

The sample code ran in NetBeans although it complained about the following tag in an xhtml file:

<h:body bgcolor="white">

Now I was getting ticked off. The sample web app does work and the error is ignored. I know it works because I changed the color to green. What I don’t understand is how the authors of this archetype felt it was acceptable to leave an error in their code. A little research revealed that it should have been written as:

<h:body style="background-color:white">

I now think I’m all set. As a further test I decide to try to add a new JSF Facelets template file. I could not create the file because NetBeans declared that there was No Facelets Libraries Found. But I thought org.apache.openejb.javaee-api would take care of this. A look into the Dependencies folder of the project revealed that there were no JSF libraries. So back to Google and the following was added:

<dependency>
   <groupId>org.apache.myfaces.core</groupId>
   <artifactId>myfaces-impl-ee6</artifactId>
   <version>2.1.1</version>
   <scope>provided</scope>
</dependency>

How can we be told that JSF should be used in place of Servlets and JSPs only to discover that org.apache.openejb.javaee-api does not include MyFaces? I found my fix and so it’s time to move on.

The archetype sample code now ran flawlessly and I could add new Facelet template files.

I had successfully followed the Eclipse JSF Tools Tutorial – JSF 2.0 using may Maven based project setup. You can find this tutorial in the Eclipse help system. I uploaded it to my SVN repository and then brought it down to NetBeans. It ran successfully in NetBeans. Now I replaced most of the pom.xml file with the new components from the archetype sample and it continued to run flawlessly. I was on a roll. So I updated the repository from NetBeans and brought the project back into Eclipse. Eclipse was not happy.

Eclipse complained about a section of the JPA plugin in the pom.xml file.

<executions>
   <execution>
      <id>enhancer</id>
      <phase>process-classes</phase>
      <goals>
         <goal>enhance</goal>
      </goals>
   </execution>
</executions>

I could comment these lines out but NetBeans was okay with them. The error message in Eclipse stated that “Plugin execution not covered by lifecycle configuration”. Back to Google and a solution was found. It seems Eclipse’s m2e plugin needs information about the lifecycle and this needed to be added to the pom.xml. You can read about this here.

So more elements were added to the pom.xml. I did discover that while you normally place plugins as a child of the <plugins> tag, the fix for Eclipse required the plugins to be children of <pluginManagement><plugins>.

Once Eclipse was happy I moved the project back through SVN to NetBeans and it did not mind the Eclipse specific elements in the pom.xml. The Eclipse tutorial project worked on both platforms and I could create the project from scratch on both platforms.

The last niggling problem was a warning whenever I ran the Eclipse tutorial. TomEE wrote out to the console:

WARNING: Attribute ‘for’ of label component with id j_id_a is not defined

I popped this into Google and came up with this answer.

The author of the Eclipse tutorial wrote:

<h:outputLabel value="Welcome #{loginBean.name}"></h:outputLabel>

This was the cause of the problem and the Stack Overflow author of the answer made some pretty strong remarks about whomever writes this in tutorials. I concurred. The fix is:

<h:outputText value="Welcome #{loginBean.name}"></h:outputText>

The tutorial also failed to use CDI correctly but that was a simple fix.

Here is the final version of the pom.xml file. Final, that is, until I discover some other component of the Java EE 6 Web profile that is missing from the org.apache.openejb.javaee-api.

<project xmlns="http://maven.apache.org/POM/4.0.0" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
    http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.kenfogel</groupId>
   <artifactId>JSFExample01</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <packaging>war</packaging>
   <name>JSF Example</name>
   <description>JSF 2.0 Tools Tutorial from Eclipse</description>
   <dependencies>
      <dependency>
         <groupId>junit</groupId>
         <artifactId>junit</artifactId>
         <version>4.11</version>
         <scope>test</scope>
      </dependency>
      <!-- Apache OpenEJB -->
      <dependency>
         <groupId>org.apache.openejb</groupId>
         <artifactId>javaee-api</artifactId>
         <version>6.0-5</version>
         <scope>provided</scope>
      </dependency>
      <!-- Apache MyFaces library that is included with TomEE 
           but not considered  part of the javaee-api -->
      <dependency>
         <groupId>org.apache.myfaces.core</groupId>
         <artifactId>myfaces-impl-ee6</artifactId>
         <version>2.1.1</version>
         <scope>provided</scope>
      </dependency>
   </dependencies>
   <build>
      <pluginManagement>
         <plugins>
            <!--This plugin's configuration is used to store 
                Eclipse m2e settings only. It has no influence 
                on the Maven build itself. Appears harmless in 
                NetBeans -->
            <plugin>
               <groupId>org.eclipse.m2e</groupId>
               <artifactId>lifecycle-mapping</artifactId>
               <version>1.0.0</version>
               <configuration>
                  <lifecycleMappingMetadata>
                     <pluginExecutions>
                        <pluginExecution>
                           <pluginExecutionFilter>
                              <groupId>some-group-id</groupId>
                              <artifactId>some-artifact-id
                              </artifactId>
                              <versionRange>[1.0.0,)</versionRange>
                              <goals>
                                 <goal>some-goal</goal>
                              </goals>
                           </pluginExecutionFilter>
                           <action>
                              <execute>
                                 <runOnIncremental>false
                                 </runOnIncremental>
                              </execute>
                           </action>
                        </pluginExecution>
                     </pluginExecutions>
                  </lifecycleMappingMetadata>
               </configuration>
            </plugin>
            <!-- Java Persistence API settings -->
            <plugin>
               <groupId>org.apache.openjpa</groupId>
               <artifactId>openjpa-maven-plugin</artifactId>
               <version>2.3.0</version>
               <configuration>
                  <includes>**/entities/*.class</includes>
                  <excludes>**/entities/XML*.class</excludes>
                  <addDefaultConstructor>true
                  </addDefaultConstructor>
                  <enforcePropertyRestrictions>true
                  </enforcePropertyRestrictions>
               </configuration>
               <!-- Maven settings not supported by Eclipse 
                    without the plugin above. NetBeans is fine with
                    with or without the plugin above -->
               <executions>
                  <execution>
                     <id>enhancer</id>
                     <phase>process-classes</phase>
                     <goals>
                        <goal>enhance</goal>
                     </goals>
                  </execution>
               </executions>
               <dependencies>
                  <dependency>
                     <groupId>org.apache.openjpa</groupId>
                     <artifactId>openjpa</artifactId>
                     <!-- set the version to be the same as the 
                          level in your runtime -->
                     <version>2.3.0</version>
                  </dependency>
               </dependencies>
            </plugin>
            <!-- used to compile the sources of your project -->
            <plugin>
               <groupId>org.apache.maven.plugins</groupId>
               <artifactId>maven-compiler-plugin</artifactId>
               <version>3.1</version>
               <!-- Java version -->
               <configuration>
                  <source>1.7</source>
                  <target>1.7</target>
               </configuration>
            </plugin>
            <!-- used during the test phase of the build 
                 lifecycle to execute the unit tests of 
                 an application -->
            <plugin>
               <groupId>org.apache.maven.plugins</groupId>
               <artifactId>maven-surefire-plugin</artifactId>
               <version>2.16</version>
            </plugin>
            <!-- responsible for collecting all artifact 
                 dependencies, classes and resources of the web 
                 application and packaging them into a 
                 war file -->
            <plugin>
               <groupId>org.apache.maven.plugins</groupId>
               <artifactId>maven-war-plugin</artifactId>
               <version>2.4</version>
               <configuration>
                  <failOnMissingWebXml>false</failOnMissingWebXml>
                  <webXml>src/main/webapp/WEB-INF/web.xml</webXml>
               </configuration>
            </plugin>
         </plugins>
      </pluginManagement>
   </build>
   <!-- Repository to use if required files are not in the local 
        repository -->
   <repositories>
     <repository>
       <id>apache-snapshot</id>
       <name>Apache Snapshot Repository</name>
       <url>https://repository.apache.org/content/groups/snapshots/
       </url>
     </repository>
   </repositories>
   <properties>
      <project.build.sourceEncoding>UTF-8
      </project.build.sourceEncoding>
   </properties>
</project>

Please let me know if you see any errors. The fix for the Eclipse lifecycle error has meaningless information in it because I could not find any meaningful values. What I saw all appeared quite arbitrary.

I think that I can now begin planning the curriculum for my courses.

Read the original blog entry...

More Stories By Ken Fogel

In 1980 I bought for myself the most wonderful toy of the day, the Apple ][+. Obsession followed quickly and by 1983 I was writing software for small and medium sized businesses in Montreal for both the Apple and the IBM PC under the company name Omnibus Systems. In the evenings I taught continuing education courses that demystified the computer to the first generation of workers who found themselves with their typewriter on the scrap heap and a PC with WordStar taking its place.

In 1990 I was invited to join the faculty at Dawson College in the Computer Science Technology program. When I joined the program the primary language was COBOL and my responsibility was to teach small systems languages such as BASIC and C/C++.

Today I am now the chairperson and program coordinator of the Computer Science Technology program at Dawson. The program's primary language is Java and the focus is on enterprise programming.

I like to write about the every day problems my students and I face in using various languages and platforms to get the job done. And from time to time I stray from the path and write about what I plan to do, what I actually get around to doing, and what I imagine I am doing.

@omniprof

Latest Stories
While a hybrid cloud can ease that transition, designing and deploy that hybrid cloud still offers challenges for organizations concerned about lack of available cloud skillsets within their organization. Managed service providers offer a unique opportunity to fill those gaps and get organizations of all sizes on a hybrid cloud that meets their comfort level, while delivering enhanced benefits for cost, efficiency, agility, mobility, and elasticity.
Isomorphic Software is the global leader in high-end, web-based business applications. We develop, market, and support the SmartClient & Smart GWT HTML5/Ajax platform, combining the productivity and performance of traditional desktop software with the simplicity and reach of the open web. With staff in 10 timezones, Isomorphic provides a global network of services related to our technology, with offerings ranging from turnkey application development to SLA-backed enterprise support. Leadin...
DevOps has long focused on reinventing the SDLC (e.g. with CI/CD, ARA, pipeline automation etc.), while reinvention of IT Ops has lagged. However, new approaches like Site Reliability Engineering, Observability, Containerization, Operations Analytics, and ML/AI are driving a resurgence of IT Ops. In this session our expert panel will focus on how these new ideas are [putting the Ops back in DevOps orbringing modern IT Ops to DevOps].
Darktrace is the world's leading AI company for cyber security. Created by mathematicians from the University of Cambridge, Darktrace's Enterprise Immune System is the first non-consumer application of machine learning to work at scale, across all network types, from physical, virtualized, and cloud, through to IoT and industrial control systems. Installed as a self-configuring cyber defense platform, Darktrace continuously learns what is ‘normal' for all devices and users, updating its understa...
Enterprises are striving to become digital businesses for differentiated innovation and customer-centricity. Traditionally, they focused on digitizing processes and paper workflow. To be a disruptor and compete against new players, they need to gain insight into business data and innovate at scale. Cloud and cognitive technologies can help them leverage hidden data in SAP/ERP systems to fuel their businesses to accelerate digital transformation success.
Concerns about security, downtime and latency, budgets, and general unfamiliarity with cloud technologies continue to create hesitation for many organizations that truly need to be developing a cloud strategy. Hybrid cloud solutions are helping to elevate those concerns by enabling the combination or orchestration of two or more platforms, including on-premise infrastructure, private clouds and/or third-party, public cloud services. This gives organizations more comfort to begin their digital tr...
Most organizations are awash today in data and IT systems, yet they're still struggling mightily to use these invaluable assets to meet the rising demand for new digital solutions and customer experiences that drive innovation and growth. What's lacking are potent and effective ways to rapidly combine together on-premises IT and the numerous commercial clouds that the average organization has in place today into effective new business solutions.
Keeping an application running at scale can be a daunting task. When do you need to add more capacity? Larger databases? Additional servers? These questions get harder as the complexity of your application grows. Microservice based architectures and cloud-based dynamic infrastructures are technologies that help you keep your application running with high availability, even during times of extreme scaling. But real cloud success, at scale, requires much more than a basic lift-and-shift migrati...
David Friend is the co-founder and CEO of Wasabi, the hot cloud storage company that delivers fast, low-cost, and reliable cloud storage. Prior to Wasabi, David co-founded Carbonite, one of the world's leading cloud backup companies. A successful tech entrepreneur for more than 30 years, David got his start at ARP Instruments, a manufacturer of synthesizers for rock bands, where he worked with leading musicians of the day like Stevie Wonder, Pete Townsend of The Who, and Led Zeppelin. David has ...
Darktrace is the world's leading AI company for cyber security. Created by mathematicians from the University of Cambridge, Darktrace's Enterprise Immune System is the first non-consumer application of machine learning to work at scale, across all network types, from physical, virtualized, and cloud, through to IoT and industrial control systems. Installed as a self-configuring cyber defense platform, Darktrace continuously learns what is ‘normal' for all devices and users, updating its understa...
Dion Hinchcliffe is an internationally recognized digital expert, bestselling book author, frequent keynote speaker, analyst, futurist, and transformation expert based in Washington, DC. He is currently Chief Strategy Officer at the industry-leading digital strategy and online community solutions firm, 7Summits.
Addteq is a leader in providing business solutions to Enterprise clients. Addteq has been in the business for more than 10 years. Through the use of DevOps automation, Addteq strives on creating innovative solutions to solve business processes. Clients depend on Addteq to modernize the software delivery process by providing Atlassian solutions, create custom add-ons, conduct training, offer hosting, perform DevOps services, and provide overall support services.
Contino is a global technical consultancy that helps highly-regulated enterprises transform faster, modernizing their way of working through DevOps and cloud computing. They focus on building capability and assisting our clients to in-source strategic technology capability so they get to market quickly and build their own innovation engine.
When applications are hosted on servers, they produce immense quantities of logging data. Quality engineers should verify that apps are producing log data that is existent, correct, consumable, and complete. Otherwise, apps in production are not easily monitored, have issues that are difficult to detect, and cannot be corrected quickly. Tom Chavez presents the four steps that quality engineers should include in every test plan for apps that produce log output or other machine data. Learn the ste...
Digital Transformation is much more than a buzzword. The radical shift to digital mechanisms for almost every process is evident across all industries and verticals. This is often especially true in financial services, where the legacy environment is many times unable to keep up with the rapidly shifting demands of the consumer. The constant pressure to provide complete, omnichannel delivery of customer-facing solutions to meet both regulatory and customer demands is putting enormous pressure on...