Develop Reference

How to add a scala dependency to a Java project in intelliJ that use maven

I want to use a scala dependency in a pure Java project. There is no need to write scala in my project but of course I will have to use classes/etc defined in the scala project that I add as a dependency. Want to do this in a intelliJ maven project.
My pom looks like this:
<?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>com.xxx</groupId>
<artifactId>xxxx</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>group ID</groupId>
<artifactId>scala dependancy</artifactId>
</dependency>
</dependencies>
</project>
Although I dont see any errors in pom, intellij is unable to import packages defined in the scala library. Essentially it cant find them.
What am I doing wrong here?

You can do so by adding the following dependency to your pom.xml file:
<dependencies>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>2.11.7</version>
</dependency>
</dependencies>
<build>
<plugins>
<!-- This plugin compiles Scala files -->
<plugin>
<groupId>net.alchim31.maven</groupId>
<artifactId>scala-maven-plugin</artifactId>
<executions>
<execution>
<id>scala-compile-first</id>
<phase>process-resources</phase>
<goals>
<goal>add-source</goal>
<goal>compile</goal>
</goals>
</execution>
<execution>
<id>scala-test-compile</id>
<phase>process-test-resources</phase>
<goals>
<goal>testCompile</goal>
</goals>
</execution>
</executions>
</plugin>
<!-- This plugin compiles Java files -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
<executions>
<execution>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
</execution>
</executions>
</plugin>
<!-- This plugin adds all dependencies to JAR file during 'package' command.
Pay EXTRA attention to the 'mainClass' tag.
You have to set name of class with entry point to program ('main' method) -->
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.5.3</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<archive>
<manifest>
<mainClass>ScalaRunner</mainClass>
</manifest>
</archive>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
Take a look at this for more information.

How to exclude and include properly classes, packages and jar classes, lib from the jacoco report (Instrumentation offline)

I am using JaCoCo code coverage, but the report is including classes from jar, lib. (Offline Instrumentation, Maven)
I solved the problem with the offline configuration since "aspectj-maven-plugin" was changing the class files, and also now I successfully exclude the packages outside of target/classes -> src. thanks to this answer in stackoverflow.
But now I am getting the classes from jar, lib inside the report and I have not idea how to exclude then. I Show my configuration and examples below
I also tried this solution Exclude classes of jar files from jacoco coverage report But it doesn't work for me.
<exclude>**/lib/*</exclude>
My jacoco offline configuration:
<properties>
<jacoco.version>0.8.4</jacoco.version>
<argLine></argLine>
</properties>
<dependency>
<groupId>org.jacoco</groupId>
<artifactId>org.jacoco.agent</artifactId>
<classifier>runtime</classifier>
<version>${jacoco.version}</version>
</dependency>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>${jacoco.version}</version>
<executions>
<execution>
<goals>
<goal>instrument</goal>
<goal>restore-instrumented-classes</goal>
<goal>report</goal>
</goals>
<configuration>
<!-- this configuration affects all goals -->
<excludes>
<exclude>*</exclude>
<exclude>com/company/rrPackage/**/*.class</exclude>
<exclude>org/**/*.class</exclude>
</excludes>
</configuration>
</execution>
</executions>
</plugin>
surefire-plugin
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.15</version>
<configuration>
<testNGArtifactName>...</testNGArtifactName>
<suiteXmlFiles>
<suiteXmlFile>...</suiteXmlFile>
</suiteXmlFiles>
<skip>${skip.test}</skip>
<systemPropertyVariables>
<jacoco-agent.destfile>target/jacoco.exec</jacoco-agent.destfile>
</systemPropertyVariables>
<properties>
...
</properties>
</configuration>
</plugin>
And the reason what I think that I am getting classes from jar inside de jacoco:report. In my pom.xml I have the following dependencies:
<dependency>
<groupId>org.hsqldb</groupId>
<artifactId>hsqldb</artifactId>
<version>2.2.9</version>
</dependency>
Also I have a couple of import in my classes like this
import org.hsqldb.lib.StringUtil;
for example:
This has no dependency on the pom.xml but is used in one of the project classes, and jacoco shows it in the report
import javax.mail.internet.AddressException;
I have other cases with the same behavior that result in the same problem: Jacoco show those classes from jar in the report, as shown in the images

Try includes instead of excludes. Notice that you need .class at the end.
try something like that:
<configuration>
<includes>
<include>com/company/package/**/*.class</include>
</includes>
</configuration>
Base on your example:
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>${jacoco.version}</version>
<executions>
<execution>
<goals>
<goal>instrument</goal>
<goal>restore-instrumented-classes</goal>
<goal>report</goal>
</goals>
<configuration>
<!-- this configuration affects all goals -->
<includes>
<include>com/company/packageToInclude/**/*.class</include>
</includes>
</configuration>
</execution>
</executions>
</plugin>

I don't know how you generate lib directory, because you don't provide complete example.
However in case of the following example
src/main/java/Example.java
class Example {
}
src/test/java/ExampleTest.java
public class ExampleTest {
#org.junit.Test
public void test() {
new Example();
}
}
and pom.xml
<?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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>example</artifactId>
<version>0.1-SNAPSHOT</version>
<properties>
<jacoco.version>0.8.4</jacoco.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>org.jacoco</groupId>
<artifactId>org.jacoco.agent</artifactId>
<classifier>runtime</classifier>
<version>${jacoco.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<phase>test-compile</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<includeArtifactIds>junit</includeArtifactIds>
<outputDirectory>${project.build.directory}/classes/lib</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>${jacoco.version}</version>
<executions>
<execution>
<goals>
<goal>instrument</goal>
<goal>restore-instrumented-classes</goal>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<systemPropertyVariables>
<jacoco-agent.destfile>target/jacoco.exec</jacoco-agent.destfile>
</systemPropertyVariables>
</configuration>
</plugin>
</plugins>
</build>
</project>
execution of mvn clean verify produces
$ ls -R target/classes
target/classes:
Example.class lib
target/classes/lib:
junit-4.12.jar
and following report
And after addition of following <configuration>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>${jacoco.version}</version>
<executions>
<execution>
<goals>
<goal>instrument</goal>
<goal>restore-instrumented-classes</goal>
<goal>report</goal>
</goals>
<configuration>
<excludes>
<exclude>lib/**</exclude>
</excludes>
</configuration>
</execution>
</executions>
</plugin>
execution of the same command mvn clean verify produces following report
If the above doesn't help, then please provide absolutely complete example allowing everybody else to reproduce exactly the same what you do.

Include Scala project in Java Maven dependency

Im new to scala, Im trying to include scala project into my java project.
I have separate scala and java project and Im using scala in java.
It is working fine when I add scalaTest to my java project build path. Is there any way I can edit my pom.xml that automatically refer the scalaTest project while maven build?.
I have added scala dependency in my pom.xml
Or is there any way that I can include both java and scala files into my java project and run ?

If you the following pom.xml you should be able to compile Java and Scala sources from within the same project via mvn.
<?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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>javaScala</artifactId>
<version>1.0-SNAPSHOT</version>
<name>javaScala</name>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>2.11.7</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.scala-tools</groupId>
<artifactId>maven-scala-plugin</artifactId>
<version>2.15.2</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>testCompile</goal>
</goals>
</execution>
</executions>
<configuration>
<sourceDir>src/main/scala</sourceDir>
<testSourceDir>src/test/scala</testSourceDir>
<jvmArgs>
<jvmArg>-Xms64m</jvmArg>
<jvmArg>-Xmx1024m</jvmArg>
</jvmArgs>
</configuration>
</plugin>
</plugins>
</build>
</project>

Answers to my own question
Add Scala project in class path (buildpath) of java project.
Export Scala project as jar and import to your java project.
To include both java and scala in single java project, follow this.
Include java files into - src/main/java
Include scala files into - src/main/scala
Use this pom.xml
Download project from https://github.com/rthoma24/Java-Scala.git
maven commands
mvn compile
mvn exec:java -Dexec.mainClass=main.java.Test
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>ted-gao</groupId>
<artifactId>scala-java-mix</artifactId>
<version>1.0-SNAPSHOT</version>
<name>Scala-Java mixture</name>
<description>Showcase mixing Scala and Java</description>
<packaging>jar</packaging>
<build>
<plugins>
<!-- ensure that we use JDK 1.6 -->
<plugin>
<inherited>true</inherited>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
<plugin>
<groupId>org.scala-tools</groupId>
<artifactId>maven-scala-plugin</artifactId>
<version>2.15.2</version>
<executions>
<!-- Run scala compiler in the process-resources phase, so that dependencies on
scala classes can be resolved later in the (Java) compile phase -->
<execution>
<id>scala-compile-first</id>
<phase>process-resources</phase>
<goals>
<goal>compile</goal>
</goals>
</execution>
<!-- Run scala compiler in the process-test-resources phase, so that dependencies on
scala classes can be resolved later in the (Java) test-compile phase -->
<execution>
<id>scala-test-compile</id>
<phase>process-test-resources</phase>
<goals>
<goal>testCompile</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<executions>
<!-- Add src/main/scala to source path of Eclipse -->
<execution>
<id>add-source</id>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>src/main/scala</source>
</sources>
</configuration>
</execution>
<!-- Add src/test/scala to test source path of Eclipse -->
<execution>
<id>add-test-source</id>
<phase>generate-test-sources</phase>
<goals>
<goal>add-test-source</goal>
</goals>
<configuration>
<sources>
<source>src/test/scala</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
<!-- to generate Eclipse artifacts for projects mixing Scala and Java -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-eclipse-plugin</artifactId>
<version>2.8</version>
<configuration>
<downloadSources>true</downloadSources>
<downloadJavadocs>true</downloadJavadocs>
<projectnatures>
<projectnature>org.scala-ide.sdt.core.scalanature</projectnature>
<projectnature>org.eclipse.jdt.core.javanature</projectnature>
</projectnatures>
<buildcommands>
<buildcommand>org.scala-ide.sdt.core.scalabuilder</buildcommand>
</buildcommands>
<classpathContainers>
<classpathContainer>org.scala-ide.sdt.launching.SCALA_CONTAINER</classpathContainer>
<classpathContainer>org.eclipse.jdt.launching.JRE_CONTAINER</classpathContainer>
</classpathContainers>
<excludes>
<!-- in Eclipse, use scala-library, scala-compiler from the SCALA_CONTAINER rather than POM <dependency> -->
<exclude>org.scala-lang:scala-library</exclude>
<exclude>org.scala-lang:scala-compiler</exclude>
</excludes>
<sourceIncludes>
<sourceInclude>**/*.scala</sourceInclude>
<sourceInclude>**/*.java</sourceInclude>
</sourceIncludes>
</configuration>
</plugin>
<!-- When run tests in the test phase, include .java and .scala source files -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.8.1</version>
<configuration>
<includes>
<include>**/*.java</include>
<include>**/*.scala</include>
</includes>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>2.9.0</version>
</dependency>
</dependencies>
</project>
If mvn install/compile gives any error, delete your m2 directory and try again.

How to configure Maven to build two versions of an artifact, each one for a different target JRE

I have a maven module that I need to use in the J2ME client and in the EJB server. In the client I need to compile it for target 1.1 and in the server for target 1.6 .
I also need to deploy the 1.6 version to a Nexus repository, so the members working on the server project can include this dependency without needing to download the source code.
I've read at http://java.dzone.com/articles/maven-profile-best-practices that using profiles is not the best way of doing this, but the author didn't say what's the best way.
Here is my pom.xml:
<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>
<parent>
<artifactId>proj-parent</artifactId>
<groupId>br.com.comp.proj</groupId>
<version>0.0.4-SNAPSHOT</version>
</parent>
<artifactId>proj-cryptolib</artifactId>
<name>proj - Cryto Lib</name>
<dependencies>
<dependency>
<groupId>br.com.comp</groupId>
<artifactId>comp-proj-mobile-messages</artifactId>
<version>0.0.2-SNAPSHOT</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.3</source>
<target>1.1</target>
<fork>true</fork>
</configuration>
</plugin>
</plugins>
</build>
</project>

As Haylem suggests thought you'll need to do it in two steps, one for the compile and one for the jars.
For the compiler
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.5</version>
<executions>
<execution>
<configuration>
<source>1.3</source>
<target>1.5</target>
<fork>true</fork>
<outputDirectory>${project.build.outputDirectory}_jdk5</outputDirectory>
</configuration>
</execution>
<execution>
<configuration>
<source>1.3</source>
<target>1.6</target>
<fork>true</fork>
<outputDirectory>${project.build.outputDirectory}_jdk6</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
And then for the jar plugin
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.3.1</version>
<executions>
<execution>
<goals>
<goal>jar</goal>
</goals>
<configuration>
<classesDirectory>${project.build.outputDirectory}_jdk5</classesDirectory>
<classifier>jdk5</classifier>
</configuration>
</execution>
<execution>
<goals>
<goal>jar</goal>
</goals>
<configuration>
<classesDirectory>${project.build.outputDirectory}_jdk6</classesDirectory>
<classifier>jdk6</classifier>
</configuration>
</execution>
</executions>
</plugin>
you can then refer to the required jar by adding a <classifier> element to your dependency. e.g.
<dependency>
<groupId>br.com.comp.proj</groupId>
<artifactId>proj-cryptolib</artifactId>
<version>0.0.4-SNAPSHOT</version>
<classifier>jdk5</classifier>
</dependency>

You can configure this via the Maven compiler plugin.
Take a look at the Maven compiler plugin documentation.
You could enable this via different profiles for instance.
If you only want to have different target versions you could simply use a variable target. Something like this:
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.3</source>
<target>${TARGET_VERSION}</target>
<fork>true</fork>
</configuration>
</plugin>

To complement my comment to wjans' answer, as you requested more details.
The following would have the compiler plugin executed twice to produce two different sets of classfiles, identified by what is called a classifier (basically, a marker for Maven to know what you refer to when a single project can produce multiple artifacts).
Roughly, something like:
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.5</version>
<executions>
<execution>
<configuration>
<source>1.3</source>
<target>1.5</target>
<fork>true</fork>
<classifier>jdk5</classifier>
</configuration>
</execution>
<execution>
<configuration>
<source>1.3</source>
<target>1.6</target>
<fork>true</fork>
<classifier>jdk6</classifier>
</configuration>
</execution>
</executions>
</plugin>
Note that people sometimes frown on using classifiers, as they on using profiles, as they can possibly mean that your project should be scinded in multiple projects or that you are harming your build's portability.

Maven2 Binding to a custom Phase

I have a custom plugin that is defined using the pom.xml
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>pram.plugintest</groupId>
<artifactId>pram.plugintest</artifactId>
<packaging>maven-plugin</packaging>
<version>1.1-SNAPSHOT</version>
<name>pram.plugintest Maven Mojo</name>
<url>http://maven.apache.org</url>
<build>
<plugins>
<plugin>
<artifactId>maven-plugin-plugin</artifactId>
<version>2.3</version>
<configuration>
<goalPrefix>blah</goalPrefix>
</configuration>
</plugin>
</plugins>
<resources>
<resource>
<directory>src/main/resources</directory>
</resource>
</resources>
</build>
<dependencies>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-plugin-api</artifactId>
<version>2.0</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
Running
mvn blah:touch
Creates a text file in the target directory as expected. I now create a lifecycles.xml file in the resources directory specified in the pom
<lifecycles>
<lifecycle>
<id>touch</id>
<phases>
<phase>
<id>package</id>
<executions>
<execution>
<goals>
<goal>touch</goal>
</goals>
</execution>
</executions>
</phase>
</phases>
</lifecycle>
</lifecycles>
In another maven project, I would like to bind the running of mvn blah:touch to an execution task similar to this
...
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<executions>
<execution>
<id>test1</id>
<phase>blah:touch</phase>
<goals>
<goal>java</goal>
</goals>
<configuration>
<mainClass>mainClass=org.sonatype.mavenbook.weather.Main</mainClass>
</configuration>
</execution>
</executions>
</plugin>
...
However running this creates the text file but doesn't attempt to run org.sonatype.mavenbook.weather.Main
Is this the correct approach?
Ultimately what I would like is to have multiple execution sections in the exec-maven-plugin that are not bound to the default phases. Logically it would look like this
...
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<executions>
<execution>
<id>test1</id>
<phase>blah:touch</phase>
<goals>
<goal>java</goal>
</goals>
<configuration>
<mainClass>mainClass=org.sonatype.mavenbook.weather.Main</mainClass>
</configuration>
</execution>
<execution>
<id>test2</id>
<phase>blah:touch2</phase>
<goals>
<goal>java</goal>
</goals>
<configuration>
<mainClass>mainClass=org.sonatype.mavenbook.weather.SomeOtherClass</mainClass>
</configuration>
</execution>
</executions>
</plugin>
...
So if I run mvn blah:touch then org.sonatype.mavenbook.weather.Main will be executed and if I run mvn blah:touch2 then org.sonatype.mavenbook.weather.SomeOtherClass will be executed instead.
It seems like it should be straightforward to do but there's nothing in the documentation that seems to point out how to do this.

You can not use the exec-maven-plugin for this and you do not need the lifecycle.xml if you only would like to execute your plugin during a build.
To execute your plugin during a specific Maven phase, you simply have to add
<plugins>
<plugin>
<groupId>your.group.id</groupId>
<artifactId>your.artifact.id</artifactId>
<executions>
<execution>
<id>unique-execution-id</id>
<goals>
<goal>the.goal.of.your.plugin</goal>
</goals>
<phase>maven.phase</phase>
<configuration>
....
</configuration>
</execution>
</executions>
</plugin>
</plugins>
Please specify the goal in the goal element without the prefix.
Did you read http://www.sonatype.com/books/mvnref-book/reference/writing-plugins-sect-plugins-lifecycle.html?