Develop Reference

Maven - Exclude Plugin from another Plugin

I've got a plugin that I need to use in my build. This plugin, however, has a build-time dependency on another plugin and that dependency does not work post-Java-8.
Specifically, the plugin that I want to use has this in its pom.xml file
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-antrun-plugin</artifactId>
<dependencies>
<dependency>
<groupId>com.sun</groupId>
<artifactId>tools</artifactId>
<version>${javaVersion}</version>
<scope>system</scope>
<systemPath>${tools.jar}</systemPath>
</dependency>
</dependencies>
<executions>
<execution>
<phase>test-compile</phase>
......
</execution>
</executions>
</plugin>
It's set to the test-compile phase, so it's only ever run when the plugin itself is being built, and not when it's being used.
The problem is that it's got the systemPath as part of the dependency, and this is set to something that is not resolvable using Java 9+. That in turn causes the build for the project using the plugin to fail with:
[ERROR] 'dependencies.dependency.systemPath' for com.sun:tools:jar must specify an absolute path but is ${tools.jar} #
So either I need to completely ignore the maven-antrun-plugin as part of my using this plugin, or I need to at least make the dependencies for it work.
Any thoughts?
Cheers

Installing local jar file to maven repo without using command line

I have a maven project that I just added some features to and in order to do so I had to add a local jar dependency. I have added this jar file to the lib folder of the project on Github, and I want to make it so anyone who downloads the project off Github can install that jar to their m2 directory without having to use the maven install:install-file command through command line. The POM file has the dependency already but I need a way to programmatically install the jar file when building the snapshot with mvn install.
Thoughts?

Option 0:
Deploy the jar file to a public or comany-wide maven repository. If the project producing this jar is also a git(hub) project, consider using a service like Jitpack
Option 1:
Ugly, but could work.
<dependency>
<groupId>com.bar</groupId>
<artifactId>foo</artifactId>
<version>42</version>
<scope>system</scope>
<systemPath>${project.basedir}/lib/foo-42.jar</systemPath>
</dependency>
Option 2:
Even more ugly, but could work even better.
<build>
<plugins>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<executions>
<execution>
<id>install-foo</id>
<goals>
<goal>install-file</goal>
</goals>
<phase>generate-sources</phase>
<configuration>
<groupId>com.bar</groupId>
<artifactId>foo</artifactId>
<version>42</version>
<file>${project.basedir}/lib/foo-42.jar</file>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>

Running JAR with maven-dependencies not contained in this JAR

So i have a following problem:
I have a maven-project with several maven-dependencies. When i run mvn install it'll be packaged as .jar and the .jar together with the .pom-File will be placed inside my maven-repository. Now, this .jar does not contain other dependencies (and is also not supposed to!). Now, given that i have all the dependencies needed installed in my maven repository (which obviously maven will take care of), how can i run this jar on the command line without setting the classpath to point to every damn jar in the maven-repository? Is there any other way? mvn exec:java only seems to work within the maven-source directory, where it looks for the "pom.xml". But after installing, "pom.xml" becomes "name-version.pom" and i have a .jar instead of direct source/class-files. Is there any other way to point mvn exec:java to work with the .jar and .pom-File within the maven repository? Or maybe some other and better approach to do so?
Thanks in advance :)
EDIT1: I'll just put my comment from below in here to avoid further misunderstandings:
I do not want to put the dependency jars somewhere. I want to use the repository maven already takes care of.Theoretically given, that i have ALL libraries i will ever need already in my local maven repository. I want to be able to download any other maven project, that might be using some of the libraries i already have installed in my local repository, also install it using "maven install", then remove the source i downloaded and then execute the .jar created by maven and tell java or maven (depending on what the best approach is) to look for the dependencies of that project in my local maven repository.
I hope i made it clear enough :)
EDIT 2: So i decided to use mvn install to install the projects into my local .m2 repo and also keep the projects unpackaged in some defined folder.Then i can just call mvn exec:java inside those projects to run them and maven will resolve all the dependencies for me.

You may exclude some dependency that you don't want to be in your project like this -
<project>
...
<dependencies>
<dependency>
<groupId>sample.ProjectA</groupId>
<artifactId>Project-A</artifactId>
<version>1.0</version>
<scope>compile</scope>
<exclusions>
<exclusion> <!-- declare the exclusion here -->
<groupId>sample.ProjectB</groupId>
<artifactId>Project-B</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
</project>
For more information you may check the link

Make a Jar executable and define classpath dependencies with maven can be done using maven-jar-plugin to create a manifest file. The manifest file is usually used for that
example
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.6</version>
<configuration>
<archive>
<manifest>
<!-- It define the classpath dependencies -->
<addClasspath>true</addClasspath>
<classpathPrefix>dependency-jars/</classpathPrefix>
<!-- it makes the jar executable -->
<mainClass>com.mycompany.App</mainClass>
</manifest>
<!-- it define some entries about your artifact -->
<manifestEntries>
<Build-Maven>Maven ${maven.version}</Build-Maven>
<Build-Java>${java.version}</Build-Java>
<Build-OS>${os.name}</Build-OS>
<Build-Label>${project.version}</Build-Label>
</manifestEntries>
</archive>
</configuration>
</plugin>
When you run the command mvn package|install, the following meta-inf/manifest.mf file will be created and added into the Jar.
If you need the dependency jar be in somewhere, that can be done easily, you will use maven-dependency-plugin to copy project dependencies to somewhere you want. you can copy into your project build directory into the manifest prefix folder defined
<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}/dependency-jars/
</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
all dependencies will be in {project}/target/dependency-jars/
That approach not include any dependency into the jar all will be out the jar in somewhere you define.
You can configurate your projects using this approach as you need
whit this approach you only have to do mvn clean install and execute your jar
I hope this aproach be the solution that you need.

Maven is not adding a library to the final JAR [duplicate]

I have a proprietary jar that I want to add to my pom as a dependency.
But I don't want to add it to a repository. The reason is that I want my usual maven commands such as mvn compile, etc, to work out of the box. (Without demanding from the developers a to add it to some repository by themselves).
I want the jar to be in a 3rdparty lib in source control, and link to it by relative path from the pom.xml file.
Can this be done? How?

I want the jar to be in a 3rdparty lib in source control, and link to it by relative path from the pom.xml file.
If you really want this (understand, if you can't use a corporate repository), then my advice would be to use a "file repository" local to the project and to not use a system scoped dependency. The system scoped should be avoided, such dependencies don't work well in many situation (e.g. in assembly), they cause more troubles than benefits.
So, instead, declare a repository local to the project:
<repositories>
<repository>
<id>my-local-repo</id>
<url>file://${project.basedir}/my-repo</url>
</repository>
</repositories>
Install your third party lib in there using install:install-file with the localRepositoryPath parameter:
mvn install:install-file -Dfile=<path-to-file> -DgroupId=<myGroup> \
-DartifactId=<myArtifactId> -Dversion=<myVersion> \
-Dpackaging=<myPackaging> -DlocalRepositoryPath=<path>
Update: It appears that install:install-file ignores the localRepositoryPath when using the version 2.2 of the plugin. However, it works with version 2.3 and later of the plugin. So use the fully qualified name of the plugin to specify the version:
mvn org.apache.maven.plugins:maven-install-plugin:2.3.1:install-file \
-Dfile=<path-to-file> -DgroupId=<myGroup> \
-DartifactId=<myArtifactId> -Dversion=<myVersion> \
-Dpackaging=<myPackaging> -DlocalRepositoryPath=<path>
maven-install-plugin documentation
Finally, declare it like any other dependency (but without the system scope):
<dependency>
<groupId>your.group.id</groupId>
<artifactId>3rdparty</artifactId>
<version>X.Y.Z</version>
</dependency>
This is IMHO a better solution than using a system scope as your dependency will be treated like a good citizen (e.g. it will be included in an assembly and so on).
Now, I have to mention that the "right way" to deal with this situation in a corporate environment (maybe not the case here) would be to use a corporate repository.

Using the system scope. ${basedir} is the directory of your pom.
<dependency>
<artifactId>..</artifactId>
<groupId>..</groupId>
<scope>system</scope>
<systemPath>${basedir}/lib/dependency.jar</systemPath>
</dependency>
However it is advisable that you install your jar in the repository, and not commit it to the SCM - after all that's what maven tries to eliminate.

This is another method in addition to my previous answer at Can I add jars to maven 2 build classpath without installing them?
This will get around the limit when using multi-module builds especially if the downloaded JAR is referenced in child projects outside of the parent. This also reduces the setup work by creating the POM and the SHA1 files as part of the build. It also allows the file to reside anywhere in the project without fixing the names or following the maven repository structure.
This uses the maven-install-plugin. For this to work, you need to set up a multi-module project and have a new project representing the build to install files into the local repository and ensure that one is first.
You multi-module project pom.xml would look like this:
<packaging>pom</packaging>
<modules>
<!-- The repository module must be first in order to ensure
that the local repository is populated -->
<module>repository</module>
<module>... other modules ...</module>
</modules>
The repository/pom.xml file will then contain the definitions to load up the JARs that are part of your project. The following are some snippets of the pom.xml file.
<artifactId>repository</artifactId>
<packaging>pom</packaging>
The pom packaging prevents this from doing any tests or compile or generating any jar file. The meat of the pom.xml is in the build section where the maven-install-plugin is used.
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-install-plugin</artifactId>
<executions>
<execution>
<id>com.ibm.db2:db2jcc</id>
<phase>verify</phase>
<goals>
<goal>install-file</goal>
</goals>
<configuration>
<groupId>com.ibm.db2</groupId>
<artifactId>db2jcc</artifactId>
<version>9.0.0</version>
<packaging>jar</packaging>
<file>${basedir}/src/jars/db2jcc.jar</file>
<createChecksum>true</createChecksum>
<generatePom>true</generatePom>
</configuration>
</execution>
<execution>...</execution>
</executions>
</plugin>
</plugins>
</build>
To install more than one file, just add more executions.

This is working for me:
Let's say I have this dependency
<dependency>
<groupId>com.company.app</groupId>
<artifactId>my-library</artifactId>
<version>1.0</version>
<scope>system</scope>
<systemPath>${project.basedir}/lib/my-library.jar</systemPath>
</dependency>
Then, add the class-path for your system dependency manually like this
<Class-Path>libs/my-library-1.0.jar</Class-Path>
Full config:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<configuration>
<archive>
<manifestEntries>
<Build-Jdk>${jdk.version}</Build-Jdk>
<Implementation-Title>${project.name}</Implementation-Title>
<Implementation-Version>${project.version}</Implementation-Version>
<Specification-Title>${project.name} Library</Specification-Title>
<Specification-Version>${project.version}</Specification-Version>
<Class-Path>libs/my-library-1.0.jar</Class-Path>
</manifestEntries>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>com.company.app.MainClass</mainClass>
<classpathPrefix>libs/</classpathPrefix>
</manifest>
</archive>
</configuration>
</plugin>
<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}/libs/</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>

Basically, add this to the pom.xml:
...
<repositories>
<repository>
<id>lib_id</id>
<url>file://${project.basedir}/lib</url>
</repository>
</repositories>
...
<dependencies>
...
<dependency>
<groupId>com.mylibrary</groupId>
<artifactId>mylibraryname</artifactId>
<version>1.0.0</version>
</dependency>
...
</dependencies>

I've previously written about a pattern for doing this.
It is very similar to the solution proposed by Pascal, though it moves all such dependencies into a dedicated repository module so that you don't have to repeat it everywhere the dependency is used if it is a multi-module build.

we switched to gradle and this works much better in gradle ;). we just specify a folder we can drop jars into for temporary situations like that. We still have most of our jars defined i the typicaly dependency management section(ie. the same as maven). This is just one more dependency we define.
so basically now we can just drop any jar we want into our lib dir for temporary testing if it is not a in maven repository somewhere.

One small addition to the solution posted by Pascal
When I followed this route, I got an error in maven while installing ojdbc jar.
[INFO] --- maven-install-plugin:2.5.1:install-file (default-cli) # validator ---
[INFO] pom.xml not found in ojdbc14.jar
After adding -DpomFile, the problem was resolved.
$ mvn install:install-file -Dfile=./lib/ojdbc14.jar -DgroupId=ojdbc \
-DartifactId=ojdbc -Dversion=14 -Dpackaging=jar -DlocalRepositoryPath=./repo \
-DpomFile=~/.m2/repository/ojdbc/ojdbc/14/ojdbc-14.pom

I was facing with the same issue, and it works just removing the DlocalRepositoryPath parameter and defining the correct path from current location in the Dfile parameter:
mvn install:install-file -Dfile=./repo/com/tridion/cd_core/1.0/cd_core-1.0.jar -DgroupId=com.tridion -DartifactId=cd_core -Dversion=1.0 -Dpackaging=jar
Note: Apache Maven 3.8.6

You can use eclipse to generate a runnable Jar :
Export/Runable Jar file

Maven: add a dependency to a jar by relative path

I have a proprietary jar that I want to add to my pom as a dependency.
But I don't want to add it to a repository. The reason is that I want my usual maven commands such as mvn compile, etc, to work out of the box. (Without demanding from the developers a to add it to some repository by themselves).
I want the jar to be in a 3rdparty lib in source control, and link to it by relative path from the pom.xml file.
Can this be done? How?

I want the jar to be in a 3rdparty lib in source control, and link to it by relative path from the pom.xml file.
If you really want this (understand, if you can't use a corporate repository), then my advice would be to use a "file repository" local to the project and to not use a system scoped dependency. The system scoped should be avoided, such dependencies don't work well in many situation (e.g. in assembly), they cause more troubles than benefits.
So, instead, declare a repository local to the project:
<repositories>
<repository>
<id>my-local-repo</id>
<url>file://${project.basedir}/my-repo</url>
</repository>
</repositories>
Install your third party lib in there using install:install-file with the localRepositoryPath parameter:
mvn install:install-file -Dfile=<path-to-file> -DgroupId=<myGroup> \
-DartifactId=<myArtifactId> -Dversion=<myVersion> \
-Dpackaging=<myPackaging> -DlocalRepositoryPath=<path>
Update: It appears that install:install-file ignores the localRepositoryPath when using the version 2.2 of the plugin. However, it works with version 2.3 and later of the plugin. So use the fully qualified name of the plugin to specify the version:
mvn org.apache.maven.plugins:maven-install-plugin:2.3.1:install-file \
-Dfile=<path-to-file> -DgroupId=<myGroup> \
-DartifactId=<myArtifactId> -Dversion=<myVersion> \
-Dpackaging=<myPackaging> -DlocalRepositoryPath=<path>
maven-install-plugin documentation
Finally, declare it like any other dependency (but without the system scope):
<dependency>
<groupId>your.group.id</groupId>
<artifactId>3rdparty</artifactId>
<version>X.Y.Z</version>
</dependency>
This is IMHO a better solution than using a system scope as your dependency will be treated like a good citizen (e.g. it will be included in an assembly and so on).
Now, I have to mention that the "right way" to deal with this situation in a corporate environment (maybe not the case here) would be to use a corporate repository.

Using the system scope. ${basedir} is the directory of your pom.
<dependency>
<artifactId>..</artifactId>
<groupId>..</groupId>
<scope>system</scope>
<systemPath>${basedir}/lib/dependency.jar</systemPath>
</dependency>
However it is advisable that you install your jar in the repository, and not commit it to the SCM - after all that's what maven tries to eliminate.

This is another method in addition to my previous answer at Can I add jars to maven 2 build classpath without installing them?
This will get around the limit when using multi-module builds especially if the downloaded JAR is referenced in child projects outside of the parent. This also reduces the setup work by creating the POM and the SHA1 files as part of the build. It also allows the file to reside anywhere in the project without fixing the names or following the maven repository structure.
This uses the maven-install-plugin. For this to work, you need to set up a multi-module project and have a new project representing the build to install files into the local repository and ensure that one is first.
You multi-module project pom.xml would look like this:
<packaging>pom</packaging>
<modules>
<!-- The repository module must be first in order to ensure
that the local repository is populated -->
<module>repository</module>
<module>... other modules ...</module>
</modules>
The repository/pom.xml file will then contain the definitions to load up the JARs that are part of your project. The following are some snippets of the pom.xml file.
<artifactId>repository</artifactId>
<packaging>pom</packaging>
The pom packaging prevents this from doing any tests or compile or generating any jar file. The meat of the pom.xml is in the build section where the maven-install-plugin is used.
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-install-plugin</artifactId>
<executions>
<execution>
<id>com.ibm.db2:db2jcc</id>
<phase>verify</phase>
<goals>
<goal>install-file</goal>
</goals>
<configuration>
<groupId>com.ibm.db2</groupId>
<artifactId>db2jcc</artifactId>
<version>9.0.0</version>
<packaging>jar</packaging>
<file>${basedir}/src/jars/db2jcc.jar</file>
<createChecksum>true</createChecksum>
<generatePom>true</generatePom>
</configuration>
</execution>
<execution>...</execution>
</executions>
</plugin>
</plugins>
</build>
To install more than one file, just add more executions.

This is working for me:
Let's say I have this dependency
<dependency>
<groupId>com.company.app</groupId>
<artifactId>my-library</artifactId>
<version>1.0</version>
<scope>system</scope>
<systemPath>${project.basedir}/lib/my-library.jar</systemPath>
</dependency>
Then, add the class-path for your system dependency manually like this
<Class-Path>libs/my-library-1.0.jar</Class-Path>
Full config:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<configuration>
<archive>
<manifestEntries>
<Build-Jdk>${jdk.version}</Build-Jdk>
<Implementation-Title>${project.name}</Implementation-Title>
<Implementation-Version>${project.version}</Implementation-Version>
<Specification-Title>${project.name} Library</Specification-Title>
<Specification-Version>${project.version}</Specification-Version>
<Class-Path>libs/my-library-1.0.jar</Class-Path>
</manifestEntries>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>com.company.app.MainClass</mainClass>
<classpathPrefix>libs/</classpathPrefix>
</manifest>
</archive>
</configuration>
</plugin>
<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}/libs/</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>

Basically, add this to the pom.xml:
...
<repositories>
<repository>
<id>lib_id</id>
<url>file://${project.basedir}/lib</url>
</repository>
</repositories>
...
<dependencies>
...
<dependency>
<groupId>com.mylibrary</groupId>
<artifactId>mylibraryname</artifactId>
<version>1.0.0</version>
</dependency>
...
</dependencies>

I've previously written about a pattern for doing this.
It is very similar to the solution proposed by Pascal, though it moves all such dependencies into a dedicated repository module so that you don't have to repeat it everywhere the dependency is used if it is a multi-module build.

we switched to gradle and this works much better in gradle ;). we just specify a folder we can drop jars into for temporary situations like that. We still have most of our jars defined i the typicaly dependency management section(ie. the same as maven). This is just one more dependency we define.
so basically now we can just drop any jar we want into our lib dir for temporary testing if it is not a in maven repository somewhere.

One small addition to the solution posted by Pascal
When I followed this route, I got an error in maven while installing ojdbc jar.
[INFO] --- maven-install-plugin:2.5.1:install-file (default-cli) # validator ---
[INFO] pom.xml not found in ojdbc14.jar
After adding -DpomFile, the problem was resolved.
$ mvn install:install-file -Dfile=./lib/ojdbc14.jar -DgroupId=ojdbc \
-DartifactId=ojdbc -Dversion=14 -Dpackaging=jar -DlocalRepositoryPath=./repo \
-DpomFile=~/.m2/repository/ojdbc/ojdbc/14/ojdbc-14.pom

I was facing with the same issue, and it works just removing the DlocalRepositoryPath parameter and defining the correct path from current location in the Dfile parameter:
mvn install:install-file -Dfile=./repo/com/tridion/cd_core/1.0/cd_core-1.0.jar -DgroupId=com.tridion -DartifactId=cd_core -Dversion=1.0 -Dpackaging=jar
Note: Apache Maven 3.8.6

You can use eclipse to generate a runnable Jar :
Export/Runable Jar file