Question

I found that Maven implies specific directory layout. But I don’t understand from here: http://maven.apache.org/guides/introduction/introduction-to-the-standard-directory-layout.html
where java libraries needed to compile and run my code should be placed. I think they shouldn’t be placed under ‘src/main/resources’ because resources is something like images or so. Also it doesn’t look right to place them under ‘src/main/java’. If I wouldn’t use maven, I’d place libraries in project’s root lib directory. But I don’t think that for maven project it will be right. Please advise.

UPD: I solved the problem. The matter was that I set packages for my sources as src.main.myApp instead of main.myApp. This seems to upset maven.

Answer 1

Maven handles your project dependencies in a different way to a ‘Standard’ Java project.

You declare the libraries you depend on in your project’s pom.xml:

e.g.

<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>org.example</groupId>
    <artifactId>your-project</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>your-project-web</name>

    <dependencies>
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-mapper-asl</artifactId>
            <version>1.8.5</version>
        </dependency>
    </dependencies>     
</project>

When you use a maven command to build the project, i.e. mvn install, it will download the dependencies for you and store them in your local repository.