Apache Maven 3 Cookbook

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1. Author:Srirangan
   
2. ISBN-10:1849512442
   
3. Year:2011
   
4. Pages:224
   
5. Language:English
   
6. File size:4.89 MB
   
7. File format:PDF
   
8. Category:Programming

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Apache Maven 3 Cookbook.pdf (4.81 MB)

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不错的好书。

Importing an existing Maven project in Eclipse

If you have already set up a Maven project from the command-line, then it can easily be imported to Eclipse.

If you have not yet set up Eclipse and verified that Maven exists, please follow the Getting ready section of the preceding recipe.

How to do it...

To import an existing Maven project in Eclipse, perform the following steps:

• Navigate to File | Import… and click on Maven:
  
• Choose the project we created in the previous chapter:
  
• Import the project. You will see contents identical to what we saw when creating a new Maven project.
  

How it works...

Eclipse has built-in support for Maven projects. When a Maven project is imported, it parses the pom file, pom.xml, for the specified project. Based on the project's pom configuration file, it creates relevant Eclipse configurations to recognize source files, tests, and artifacts.

It also identifies all the dependencies of the project, downloads these using Maven (if they haven't been downloaded already), and adds them to the project dependencies.

1. Creating a new Maven project in NetBeans
   
2. 
   
3. NetBeans is another popular IDE. This is backed by Oracle, is equally feature-rich and extensible, and supports multiple languages, such as Eclipse.
   
4. 
   
5. As of writing this, NetBeans 8.0.2 is the most recent edition. The screenshots in this book reflect this version.
   
6. 
   
7. Getting ready
   
8. 
   
9. NetBeans can be downloaded in two different ways (if not downloaded already):
   
10. 
    
11. Oracle provides a download of the latest JDK along with the latest version of NetBeans. This is a good option, especially if you have not installed JDK yet.
    
12. If JDK is already installed, then NetBeans can be downloaded separately from https://netbeans.org/. There are different bundles of NetBeans (similar to Eclipse). You can choose one from Java SE or Java EE, or all of them, based on your preference.
    
13. How to do it...
    
14. 
    
15. Now that NetBeans is installed, let us create a new Maven project, by performing the following steps:
    
16. 
    
17. Navigate to Tools | Options. Choose Java and click on the Maven tab. You will notice Maven Home showing up as Bundled with (Version: 3.0.5):
    
18. How to do it...
    
19. You can leave it as is or change it to your Maven installation by choosing the dropdown.
    
20. Now navigate to File | New Project.
    
21. Choose Maven from Categories: and Java Application from Projects:, as shown in the following screenshot:
    
22. 
    
23. Specify the details of the project:
    
24. 
    
25. You are done! A new project is now created in NetBeans.
    
26. 
    
27. How it works...
    
28. 
    
29. Like Eclipse, NetBeans has built-in support for Maven. Unlike Eclipse, NetBeans did not use the Maven archetype for a quick start. Instead, it created a new project using its template. In this case, you will notice that it did not create the dummy source and test class that the quick archetype creates.

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1. Creating a new Maven project in IntelliJ IDEA
   
2. 
   
3. IntelliJ IDEA is an IDE from JetBrains. It has both Community and commercial editions. IntelliJ IDEA is enormously popular among developers and is regularly updated with the latest language and platform features.
   
4. 
   
5. For the purpose of this cookbook, we will use the Community Edition. The steps are the same for the commercial edition as well.
   
6. 
   
7. As of writing this book, IntelliJ IDEA 14.0.3 is the most recent edition. The screenshots in this book reflect this version.
   
8. 
   
9. Getting ready
   
10. 
    
11. As IntelliJ IDEA needs a Java environment to run, let us first ensure that the Java environment is set up on our system:
    
12. 
    
13. Ensure that JDK is installed.
    
14. Download IntelliJ IDEA by visiting https://www.jetbrains.com/idea/ and clicking on the Download link.
    
15. Ensure the project SDK is set to your Java installation.
    
16. How to do it...
    
17. 
    
18. Use the following steps to create a new Maven project in IntelliJ IDEA:
    
19. 
    
20. Open IntelliJ IDEA.
    
21. Click on Create New Project.
    
22. Choose Maven.
    
23. Select the Create from archetype option and choose maven-archetype-quickstart:1.1:
    
24. How to do it...
    
25. Specify the values required to create the project:
    
26. 
    
27. Confirm the values for the project:
    
28. 
    
29. You are done! A new Maven project is created in IntelliJ IDEA.
    
30. 
    
31. How it works...
    
32. 
    
33. IntelliJ IDEA has first-class support for Maven. It can create a new Maven project as per archetype by downloading the required plugins and dependencies from the repository. It uses the configured Maven settings, which can be customized as specified in the next section.

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1. Understanding the Maven lifecycle, phases, and goals
   
2. 
   
3. As we start using Maven, we need to understand the Maven project lifecycle. Maven is implemented based around the concept of a build lifecycle. This means there is a clearly defined process to build and distribute artifacts with Maven.
   
4. 
   
5. What makes up a lifecycle? The stages of a lifecycle are called phases. In each phase, one or more goals can be executed.
   
6. 
   
7. Getting ready
   
8. 
   
9. Maven is set up on your system and is verified as working. For setting up Apache Maven, refer to the first three recipes of Chapter 1, Getting Started.
   
10. 
    
11. How to do it...
    
12. 
    
13. To build a Maven project, perform the following steps:
    
14. 
    
15. Open the command prompt.
    
16. Run one of the Maven commands that we are familiar with:
    
17. mvn package
    
18. Observe the various steps that get executed.

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1. Understanding the pom file
   
2. 
   
3. Every Maven project has a pom file that defines what the project is all about and how it should be built. Pom is an acronym for project object model. Let us take a peek at this file.
   
4. 
   
5. How to do it...
   
6. 
   
7. Let's understand the pom file, by performing the following steps:
   
8. 
   
9. Go to a Maven project that we created in previous chapters.
   
10. Open the file named pom.xml.

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1. Understanding Maven settings
   
2. 
   
3. Now that we have got an idea of the essential elements of a pom file, let us also examine the various setting properties of Maven.
   
4. 
   
5. How to do it...
   
6. 
   
7. To understand the Maven settings, perform the following steps:
   
8. 
   
9. Open the settings.xml file in the .m2 subfolder of your HOME folder, if it exists:
   
10. 
    
11. Otherwise, open the settings.xml file in the conf folder of your Maven installation (as defined in M2_HOME).

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