Output build of Maven

Question

<?xml version="1.0" encoding="UTF-8"?>
<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>ABC</groupId>
<artifactId>ABCSPA</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<build>
    <finalName>ABCSPA</finalName>
    <plugins>
        <plugin>
            <groupId>org.apache.tomcat.maven</groupId>
            <artifactId>tomcat7-maven-plugin</artifactId>
            <version>2.1</version>
            <configuration>
                <port>8080</port>
                <path>${project.build.finalName}</path>
                <server>tomcatserver</server>
                <url>http://localhost:8080/manager/text</url>
                <username>admin</username>
                <password>admin</password>
                <additionalConfigFilesDir>${basedir}/src/main/tomcat/conf</additionalConfigFilesDir>
                <systemProperties>
                    <log4j.configuration>file:./src/main/tomcat/conf/log4j.xml</log4j.configuration>
                </systemProperties>
            </configuration>
            <dependencies>
                <dependency>
                    <groupId>log4j</groupId>
                    <artifactId>log4j</artifactId>
                    <version>1.2.16</version>
                </dependency>
                <dependency>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-simple</artifactId>
                    <version>1.6.1</version>
                </dependency>
                <dependency>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                    <version>1.7.1</version>
                </dependency>
                <dependency>
                    <groupId>postgresql</groupId>
                    <artifactId>postgresql</artifactId>
                    <version>9.1-901-1.jdbc4</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-expression</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-jdbc</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-orm</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-tx</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-web</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-webmvc</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-aop</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-aspects</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-beans</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-context</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-context-support</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-core</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-expression</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework.security</groupId>
                    <artifactId>spring-security-acl</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework.security</groupId>
                    <artifactId>spring-security-aspects</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework.security</groupId>
                    <artifactId>spring-security-config</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework.security</groupId>
                    <artifactId>spring-security-core</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework.security</groupId>
                    <artifactId>spring-security-core-tiger</artifactId>
                    <version>2.0.8.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework.security</groupId>
                    <artifactId>spring-security-crypto</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework.security</groupId>
                    <artifactId>spring-security-ldap</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <dependency>
                    <groupId>org.springframework.security</groupId>
                    <artifactId>spring-security-openid</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                <depenency>
                    <groupId>org.springframework.security</groupId>
                    <artifactId>spring-security-remoting</artifactId>
                    <version>3.2.5.RELEASE</version>
                </dependency>
                    <dependency>
                        <groupId>org.springframework.security</groupId>
                        <artifactId>spring-security-taglibs</artifactId>
                        <version>3.2.5.RELEASE</version>
                    </dependency>
                    <dependency>
                        <groupId>org.springframework.security</groupId>
                        <artifactId>spring-security-web</artifactId>
                        <version>3.2.5.RELEASE</version>
                    </dependency>
                    <dependency>
                        <groupId>org.springframework.data</groupId>
                        <artifactId>spring-data-jpa</artifactId>
                        <version>1.2.0.RELEASE</version>
                    </dependency>
            </dependencies>
        </plugin>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
            <configuration>
                <source>1.6</source>
                <target>1.6</target>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>sonar-maven-plugin</artifactId>
            <version>2.7.1</version>
        </plugin>
    </plugins>
</build>
<dependencies>
    <!-- Hibernate -->
    <dependency>
        <groupId>org.hibernate.javax.persistence</groupId>
        <artifactId>hibernate-jpa-2.0-api</artifactId>
        <version>1.0.1.Final</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
        <version>4.2.4.Final</version>
        <exclusions>
            <exclusion>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <!-- Spring -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
        <version>3.1.1.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>3.1.1.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>3.1.1.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-core</artifactId>
        <version>3.1.1.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-config</artifactId>
        <version>3.1.1.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-taglibs</artifactId>
        <version>3.1.1.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-web</artifactId>
        <version>3.1.1.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
        <version>3.1.1.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>3.2.3.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-oxm</artifactId>
        <version>3.1.1.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-jpa</artifactId>
        <version>1.2.0.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>cglib</groupId>
        <artifactId>cglib</artifactId>
        <version>2.2</version>
    </dependency>
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjrt</artifactId>
        <version>1.7.0</version>
    </dependency>

    <!-- JSon -->
    <dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-jaxrs</artifactId>
        <version>1.8.2</version>
    </dependency>

    <!-- Tiles -->
    <dependency>
        <groupId>org.apache.tiles</groupId>
        <artifactId>tiles-api</artifactId>
        <version>2.2.2</version>
    </dependency>
    <dependency>
        <groupId>org.apache.tiles</groupId>
        <artifactId>tiles-core</artifactId>
        <version>2.2.2</version>
        <exclusions>
            <exclusion>
                <groupId>org.slf4j</groupId>
                <artifactId>jcl-over-slf4j</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.apache.tiles</groupId>
        <artifactId>tiles-jsp</artifactId>
        <version>2.2.2</version>
    </dependency>
    <dependency>
        <groupId>org.apache.tiles</groupId>
        <artifactId>tiles-servlet</artifactId>
        <version>2.2.2</version>
    </dependency>
    <dependency>
        <groupId>org.apache.tiles</groupId>
        <artifactId>tiles-template</artifactId>
        <version>2.2.2</version>
    </dependency>

    <!-- Servlet -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.0.1</version>
        <scope>provided</scope>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>jsp-api</artifactId>
        <version>2.2</version>
        <scope>provided</scope>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>

    <!-- Utilities -->
    <dependency>
        <groupId>commons-lang</groupId>
        <artifactId>commons-lang</artifactId>
        <version>2.4</version>
    </dependency>
    <dependency>
        <groupId>com.google.guava</groupId>
        <artifactId>guava</artifactId>
        <version>10.0.1</version>
    </dependency>

    <!-- Log -->
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.1</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.16</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <artifactId>commons-logging</artifactId>
        <groupId>commons-logging</groupId>
        <version>1.1.1</version>
    </dependency>

    <!-- Junit -->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.11</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
        <version>3.2.5.RELEASE</version>
    </dependency>
</dependencies>
</project>

The list of folders getting generated in pom.xml:

apache-tomcat-maven-plugin
classes
generated-sources
generated-test-sources
m2e-wtp
maven-archiver
maven-status
surefire
test-classes
ABCSPA
tomcat
ABCSPA.war

Can some one explain why all these folders are being generated? For example: in 'generated-sources', there is a folder 'annotation' which is an empty folder.

score 2 · Accepted Answer · answered Jan 20 '16 at 09:28

In Maven, the target folder is intended to be the working build directory of Maven. This folder is inherently temporary. The logic is that this folder contains generated data, i.e. data that Maven creates at build-time. Never should you store permanent data inside this folder (the corollary is that the entries of that folder should never be version-controlled). Since this data will be generated, it should be safe to delete it before the build.

Quoting from Maven docs:

Examples for this is the build directory, which is target.

This directory is defined in the Super POM, which means all Maven projects (unless they override the property project.build.directory), will have this folder.

As such, what gets generated in it during the build depends only on what your POM is and how your build is happening. It would be too broad to try to explain all the entries in there (and I'm sure a lot of those aren't even documented as they are really temporary internal details of each plugin). There a few entries inside that will be common though:

the maven-compiler-plugin will generate by default the folder generated-sources/annotations because that's the default value for the property generatedSourcesDirectory
target/classes corresponds to the project.build.outputDirectory of the Super POM. It will contain all the generated classes by the maven-compiler-plugin.
the maven-war-plugin will generated the war by default inside this folder because that's the default value of the outputDirectory attribute.

Since this folder is supposed to remain temporary, the maven-clean-plugin has the purpose of cleaning it:

clean:clean attempts to clean a project's working directory of the files that we're generated at build-time. By default, it discovers and deletes the directories configured in project.build.directory, project.build.outputDirectory, project.build.testOutputDirectory, and project.reporting.outputDirectory.

Note that it is a good practice to invoke the maven-clean-plugin to delete those working directories before each build (not doing it can lead to weird compile behaviour, like being able to compile code that shouldn't be).

A special note about the folder m2e-wtp: this is M2Eclipse specific folder. Its presence is only tied to this Eclipse Plugin integrating Maven (so it is not linked to Maven itself per se).

Thanks a lot Tunaki :) Could you please tell why 'maven-status', 'maven-archiver' and 'apache-tomcat-maven-plugin' empty folder are geneerated? — Meenakshi, Jan 20 '16 at 09:43
@Meenakshi Those are probably generated the [Maven Archiver](https://maven.apache.org/shared/maven-archiver/) when creating the WAR. But as I said, don't worry too much about that. It's an implementation detail. — Tunaki, Jan 20 '16 at 09:47

Output build of Maven

1 Answers1

Linked