Develop Reference

Skip default jar creation in maven causes error

Im using maven 3.8.3. Tryig to avoid the step of the default jar creation, using the answers I found in topics like:
remove jar created by default in maven
What is the best way to avoid maven-jar?
What I tried:
1.
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>2.3.3</version>
<executions>
<execution>
<id>default-jar</id>
<phase>none</phase>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>2.3.3</version>
<executions>
<execution>
<id>default-jar</id>
<phase/>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<executions>
<execution>
<id>default-jar</id>
<phase>none</phase>
<configuration>
<finalName>unwanted</finalName>
<classifier>unwanted</classifier>
</configuration>
</execution>
</executions>
</plugin>
I also checked the solution of <packaging>pom</packaging> instead of jar. but I'm not sure this is the use case.
More details: This is a non-empty module, containing resources and generated unversioned java sources.
Solutins #1-#3 caused me the following error:
The packaging for this project did not assign a file to the build artifact.
Please assist, Thanks in advance.

Exclude *target* directory from the maven-checkstyle-plugin scan

I am using Apache Maven Checkstyle plugin in my pom.xml.
I am trying to exclude the target directory from the check style scan but no luck so far. Here is the pom code i am trying.
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-checkstyle-plugin</artifactId>
<executions>
<execution>
<id>checkstyle-check</id>
<phase>test</phase>
<goals>
<goal>check</goal>
</goals>
</execution>
</executions>
<configuration>
<configLocation>checkstyles.xml</configLocation>
<failsOnError>true</failsOnError>
<failOnViolation>true</failOnViolation>
<consoleOutput>true</consoleOutput>
<includes>**\/*.java,**\/*.groovy</includes>
<excludes>**WHAT GOES HERE TO EXCLUDE THE TARGET DIRECTORY**</excludes>
</configuration>
</plugin>

In Apache Maven Checkstyle Plugin version 3 to specify the location of the source directories we have to use sourceDirectories parameter. Then we can specify only directories of application/library and test sources to be used for Checkstyle:
<sourceDirectories>
<sourceDirectory>${project.build.sourceDirectory}</sourceDirectory>
<sourceDirectory>${project.build.testSourceDirectory}</sourceDirectory>
</sourceDirectories>
Now only src/main/java and src/test/java will be analysed.
Here is my full working example:
<!-- Apache Maven Checkstyle Plugin (checks Java code adheres to a coding standard) -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-checkstyle-plugin</artifactId>
<version>${maven-checkstyle-plugin.version}</version>
<executions>
<execution>
<phase>test</phase>
<goals>
<goal>check</goal>
</goals>
</execution>
</executions>
<configuration>
<sourceDirectories>
<sourceDirectory>${project.build.sourceDirectory}</sourceDirectory>
<sourceDirectory>${project.build.testSourceDirectory}</sourceDirectory>
</sourceDirectories>
<!-- relates to https://github.com/checkstyle/checkstyle/blob/master/src/main/resources/google_checks.xml -->
<configLocation>/src/main/resources/checkstyle.xml</configLocation>
</configuration>
</plugin>

<excludes>**/generated/**/*</excludes>
This will remove the generated files from the plugin.

How to add src/test/java contents to the output maven jar that gets created

I see a lot of similar questions. But unable to make this work.
I have tried testresources and build-helper-maven-plugin so far
Also I read in 1 thread how to write my own assembly plugin to do something like that.
But posting this again to see if there are cleaner ways that I don't know of
This is existing code and i got to fix it. The thing is when i open the jar after a successful build i am unable to find the src/test/java classes inside the jar. We got a maven build-helper-maven-plugin and maven-jar-plugin. But I don't see the test classes in it still.
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>1.7</version>
<executions>
<execution>
<id>add-source</id>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>src/test/java</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>2.3.1</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>jar</goal>
</goals>
<configuration>
<classifier>test</classifier>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
I see the generated classes in a test-classes directory inside the target folder. But not inside the jar
I want them inside the jar as I am depending on that jar in another project. The other project is not compiling because its importing that test class inside src/test/Java
I cannot create a new project just for this case as I don't have that liberty.

Did you try maven-dependency-plugin (instead of build-helper-maven-plugin) in combination with maven-jar-plugin ?
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.9</version><!--$NO-MVN-MAN-VER$-->
<executions>
<execution>
<id>unpack</id>
<phase>prepare-package</phase>
<goals>
<goal>unpack</goal>
</goals>
<configuration>
<artifactItems>
<artifactItem>
<groupId>you-project-group-id</groupId>
<artifactId>you-project-artifact-id</artifactId>
<version>${project.version}</version>
<type>test-jar</type>
<overWrite>false</overWrite>
<outputDirectory>${project.build.directory}/classes</outputDirectory>
</artifactItem>
</artifactItems>
</configuration>
</execution>
</executions>
</plugin>

How do I prevent a ZIP file created by maven from being deployed?

I'm using the maven-dependency-plugin to gather all of the dependencies for my application and then package them up in a ZIP file with the maven-assembly-plugin. That part is all working great.
However, when I do mvn deploy, it deploys the ZIP file to my Archiva server, which I don't want. I'd just like to have the JAR's deployed there individually.
Is there any way to prevent the upload of the ZIP file?
Here are the relevant sections of my POM:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/lib</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.3</version>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
<configuration>
<finalName>myProject-${project.version}</finalName>
<outputDirectory>../</outputDirectory>
<descriptors>
<descriptor>src/main/assembly/assembly.xml</descriptor>
</descriptors>
</configuration>
</execution>
</executions>
</plugin>

Try adding
<attach>false</attach>
to maven-assembly-plugin's configuration section. This should prevent the generated ZIP from being deployed. See http://maven.apache.org/plugins/maven-assembly-plugin/single-mojo.html

Place all libraries and files for a project in one folder

I use maven in my java build process. The following is a snippet of code that creates an single jar with all dependencies. In order to reduce the data transfer on small changes to the build I'd like to place all project files (including dependencies) in the folder target/build . I plan to rsync the folder with the remote machine running the app and run the app with:
java -cp target/build/* <classname>
How do I modify this snippet to achieve this? I've read the documentation here but don't know how to piece the fix together:
http://maven.apache.org/plugins/maven-assembly-plugin/
http://maven.apache.org/plugins/maven-assembly-plugin/assembly.html
http://maven.apache.org/plugins/maven-assembly-plugin/descriptor-refs.html
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.3</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>

Are you asking how to get maven to copy your dependencies to the target folder when you build?
I think you want the maven dependency plugin. It copies the dependencies of your project to an output folder you specify.
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.3</version>
<executions>
<execution>
<id>install</id>
<phase>install</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${targetDirectory}</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
It sounds like you may also need to maven jar plugin to tell it where to package your jar to.
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.3.1</version>
<configuration>
<outputDirectory>${dir}</outputDirectory>
</configuration>
</plugin>

Use the maven dependency plugin
It has the gole: copy-dependencies. This should do what you want.
Example (take from the documentation)
<project>
[...]
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.5.1</version>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/alternateLocation</outputDirectory>
<overWriteReleases>false</overWriteReleases>
<overWriteSnapshots>false</overWriteSnapshots>
<overWriteIfNewer>true</overWriteIfNewer>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
[...]
</project>