Develop Reference

maven-compiler-plugin not found

I am learning Selenium and I would like to try add the maven-compiler-plugin to pom.xml and reimport maven settings. So I found this example to do it http://maven.apache.org/plugins/maven-compiler-plugin/examples/set-compiler-source-and-target.html and tried to add the code to the pom.xml. But the vrsion from the example 3.8.1 is red like on the screenshot. What it means? It is a copy from example.
Here is the whole 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>
<groupId>camaj.vladimir</groupId>
<artifactId>selenium-maven</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-java</artifactId>
<version>3.141.59</version>
</dependency>
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-server</artifactId>
<version>3.141.59</version>
</dependency>
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-chrome-driver</artifactId>
<version>3.141.59</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>4.1.1</version>
</dependency>
<dependency>
<groupId>com.google.code.tempus-fugit</groupId>
<artifactId>tempus-fugit</artifactId>
<version>1.1</version>
</dependency>
<dependency>
<groupId>com.codeborne</groupId>
<artifactId>phantomjsdriver</artifactId>
<version>1.4.4</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>

In my case, I have changed the tags from plugin to dependency like it is in the Maven Repository.
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
</dependency>

In my case the groupId for the plugin was missing:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
...

In my case, Spring Boot code works fine without changing anything, however, it gives the same error when I tried to commit in Git.
To solve this, I add the version info as follows and it worked.
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
...

I've faced this issue with my old project (which was 100% working on my old ItelliJ IDEA) and newly installed ItelliJ IDEA:
in the pom.xml I had this:
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.2</version>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
</configuration>
</plugin>
</plugins>
</build>
And IDEA throwed an error maven-compiler-plugin not found. I've added
<groupId>org.apache.maven.plugins</groupId>
and IDEA found the plugin, and after that I was free to remove org.apache.maven.plugins without breaking IDEA

I got this error with IntelliJ. tried many ways, the below worked for me:
Close your IDE.
Delete "*.iml" and ".idea" -directories(present in the root folder of project)
Run "mvn clean install" from the command-line
Re-import your project into IDEA

In IntelliJ you can right click on 3.8.1 scroll down to Maven and select "Reimport". This solved the issue for me.

In my case, invalidating cache and restarting solved the issue.

Add the Following code in your pom the issue will resolve
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
<configuration>
<source>8</source>
<target>8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>3.0.0-M1</version>
<configuration>
<useSystemClassLoader>false</useSystemClassLoader>
<forkCount>1</forkCount>
<useFile>false</useFile>
<skipTests>false</skipTests>
<testFailureIgnore>true</testFailureIgnore>
<forkMode>once</forkMode>
<suiteXmlFiles>
<suiteXmlFile>testing.xml</suiteXmlFile>
</suiteXmlFiles>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
Make sure you are reimporting your dependency after adding plugins

I went to
.m2\repository\org\apache\maven\plugins\maven-compiler-plugin
and removed older version. It worked

You need to update your project so that the dependencies are updated from Maven side.
To update:
Change the file structure to project view.
Right click on project name -> Maven -> Reload project
And it will download all the necessary dependencies.

One reason could be due to proxy setup on your system in Maven settings.
You can remove/backup the previous maven settings.xml file and this should work.
mv ~/.m2/settings.xml ~/.m2/settings.xml.bak

Maven Deploying Project as Jar - Missing Class definition

I am trying to create a runnable jar from a maven project created in Intellij Idea.
I tried building the Artifact through Intellij, but that did not work out. It could not find the main file.
After that I tried it through maven with:
- mvn compile
- mvn package
This creates a runnable jar which executes, but later when parsing a csv it throws an Exception:
Exception in thread "JavaFX Application Thread"
java.lang.NoClassDefFoundError: org/apache/commons/csv/CSVParser
But it is added in my pom.xml... I downloaded everything even the docs. I can see the org.apache.commons:commons-csv package in the external libraries, but it seems to be missing when creating the jar.
<?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>
<packaging>jar</packaging>
<groupId>sceosa</groupId>
<artifactId>CEO_SA_ReportingLine</artifactId>
<version>1.0-SNAPSHOT</version>
<build>
<finalName>CEOSA</finalName>
<plugins>
<!-- download source code in Eclipse, best practice -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-eclipse-plugin</artifactId>
<version>2.9</version>
<configuration>
<downloadSources>true</downloadSources>
<downloadJavadocs>false</downloadJavadocs>
</configuration>
</plugin>
<!-- Set a compiler level -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<!-- Make this jar executable -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.1.0</version>
<configuration>
<archive>
<manifest>
<mainClass>de.Main</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.hsqldb/hsqldb -->
<!-- https://mvnrepository.com/artifact/org.apache.maven.plugins/maven-compiler-plugin -->
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.7.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.guava/guava -->
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>25.1-jre</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-csv</artifactId>
<version>1.3</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
Can anybody see what is wrong with the pom file or intellij?

By default maven does not include dependencies when building jars. The jar will only work if you have the dependency in some other way.
You can use the maven-assembly-plugin to build a jar-with-dependencies.

I have used the maven-shade-plugin and it works great if you want to bundle all your dependencies into one jar. All you need is the plugin and provide the Main class from your project and it should have a main method. It will look something like this:
<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-shade-plugin</artifactId>
    <executions>
        <execution>
            <goals>
                <goal>shade</goal>
            </goals>
            <configuration>
                <shadedArtifactAttached>true</shadedArtifactAttached>
                <transformers>
                    <transformer implementation=
                      "org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                        <mainClass>com.test.MainClass</mainClass>
                </transformer>
            </transformers>
        </configuration>
        </execution>
    </executions>
</plugin>
And just build your project using mvn clean install and you should find the the jar in your target directory and it will be suffixed with -shaded.jar. Hope this helps

JavaFX + Maven + Ojdbc6 + IntelliJ (deploy oracle jar with Javafx application for windows)

I've been trying to deploy my JavaFX application with the Oracle client (ojdbc6) embedded into the same jar.
The application runs fine and connects to the database if I'm running it through IntelliJ, but once I run the "package" task and try and run the application from double clicking the jar or running:
"java -jar .\maven-Newton-1.0-SNAPSHOT.jar"
The application starts, but it won't connect to the DB:
`
In the code I've tried both:
Class.forName("oracle.jdbc.driver.OracleDriver");
and
Class.forName("oracle.jdbc.OracleDriver");
I'm just starting with maven and I'm not too sure if my configurations are correct:
• I've tried adding the ojdbc6.jar to the global libraries:
• I've tried adding the ojdbc6.jar file to the SDK classpath:
• And I've messed around with the module dependencies:
But my problem may be lying on the POM file because the other jar that I want to embed within my application is not deploying as well (org.reflections)
• 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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>Newton</groupId>
<artifactId>maven-Newton</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<build>
<plugins>
<plugin>
<!-- Build an executable JAR -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>Controller.Main</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}</outputDirectory>
<overWriteReleases>false</overWriteReleases>
<overWriteSnapshots>true</overWriteSnapshots>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.reflections</groupId>
<artifactId>reflections</artifactId>
<version>0.9.11</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.6</version>
</plugin>
<plugin>
<!-- https://mvnrepository.com/artifact/oracle/ojdbc6 -->
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0</version>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.reflections</groupId>
<artifactId>reflections</artifactId>
<version>0.9.11</version>
</dependency>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0</version>
</dependency>
</dependencies>
</project>
Not too sure where to go from here, any help would be very much appreciated.
Thanks

The problem is that the single jar file, you produce with the 'package' goal does not contain the ojdbc.jar in itself.
You will have to run the jar file with a classpath, e.g.
java -cp ojdbc.jar;othernecessary.jar maven-newton-project-1.0.jar
Btw, there is a distinction in maven between dependencies (which are needed for the code to work) and plugins (which are needed for maven to build). You dependency on maven-compiler-plugin and maven-resource-plugin suggests to me you are confusing these two concepts.
I would move these two into the section called <build><plugins> instead alongside the maven-jar-plugin.
If you want an easy to comprehend start, try this: http://www.darrencoxall.com/java/understanding-maven/

Maven classifier empty jars

Assume we have multimodule maven project:
parent
|-module-a-jar
|-module-b-jar
|-web-module-c-war
There is common classified specified for parent pom.xml:
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.6</version>
<configuration>
<classifier>${my.project.classifier}</classifier>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.6</version>
<configuration>
<classifier>${my.project.classifier}</classifier>
</configuration>
</plugin>
</plugins>
</pluginManagement>
Assume that I build project using
mvn clean package -Dmy.project.classifier=NIGHTLY
After building web-module-c-war contains empty folders instead of jar files:
web-module-c-war
|-WEB-INF
|-lib
|-module-a-jar
|-module-a-jar
Can you please advise how to fix this? Why this is happening?
If I remove classifier from maven-jar-plugin configuration it seems to be working fine.
Thanks

why not just make this?
pom web-module-c-war :
<groupId>xxxxx</groupId>
<artifactId>xxxx</artifactId>
<version>1.0.0-SNAPSHOT</version>
<classifier>${my.project.classifier}</classifier>
..
..
<dependency>
<groupId>${project.groupId}</groupId>
<artifactId>module-a-jar</artifactId>
<version>${project.version}</version>
<classifier>${my.project.classifier}</classifier>
</dependency>
<dependency>
<groupId>${project.groupId}</groupId>
<artifactId>module-b-jar</artifactId>
<version>${project.version}</version>
<classifier>${my.project.classifier}</classifier>
</dependency>

Maven: Generating an executable jar file with all the dependencies

I recently converted one of my Java project to a Maven project. My pom.xml looks something like this:
<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>
<packaging>jar</packaging>
<groupId>com.myproject.groupid</groupId>
<artifactId>myproject</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>MyProject</name>
<description>The first version of my maven project</description>
<dependencies>
<dependency>
<groupId>com.dependent.jar</groupId>
<artifactId>dependentjar</artifactId>
<version>0.0.1</version>
<scope>system</scope>
<type>jar</type>
<systemPath>${project.basedir}/jars/dependent.jar</systemPath>
</dependency>
<dependency>
<groupId>org.apache.ws.commons.schema</groupId>
<artifactId>XmlSchema</artifactId>
<version>1.4.3</version>
</dependency>
<dependency>
</dependencies>
<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.0</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>com.myproject.main.MainClass</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</build>
</project>
When i execute the mvn compile and mvn install, the project works fine and it also generates the jar. But when i try to run the jar [using java -jar MyProject.jar], i get an error which says: Exception in thread "main" java.lang.NoClassDefFoundError and this is because maven is not able to add the dependent jar specified in the section. [it is not available during run time]
Could anybody let me know the best possible way for me to copy the systemPath jars to the jar that is being generated by maven?
I looked at maven-shade-plugin and maven-assembly-plugin and could not find much luck with both of them. Any help would be appreciated!

Try to add this to your maven-jar-plugin configuration
<addClasspath>true</addClasspath>
<classpathPrefix>*path to dependencies*</classpathPrefix>
Also to manage your dependencies you can use Maven dependency plugin

In the build section of your pom, you can use:
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.4.2</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<artifactSet>
<includes>
<include>com:library:**</include>
</artifactSet>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
Then, on the command line, you can run mvn package, it will show in the output which jars it is excluding. Then, you can include selected jars accordingly. If you then get NoClassDefFoundError, you may need to point Java to your class, by for example using com.company.Main as an argument to the java command.