Maven-tycho says Lombok required artifact is missing although other dependencies work - maven

Question

I created a p2 repo to add plugins that I later use as tycho dependencies. I however stumble across the error stack below for the lombok dependency. I know lombok is a bit of a special dependency. So I downloaded it and added it to my plugins folder and installed it. I get a different error than when I simply don't have the lombok.jar folder in the plugins folder but the suggestions listed in the error stack did not fix the issue. I also tried solutions discussed in this other stackoverflow post
mvn package fails with Required Artifact Missing even though it exists in my Remote Repository
but I still have the same mistake. My groovy dependency was added without problems.
``` mvn eclipse:eclipse
[INFO] Scanning for projects...
[INFO] Computing target platform for MavenProject: com.project:com.project.bbcode.parser:1.0.0-SNAPSHOT # C:\Users\Khady\temp\bbcode-lite-parser\pom.xml
[WARNING] Missing POM for org.projectlombok:com.project.lombok:jar:1.16.8
[ERROR] Internal error: java.lang.RuntimeException: Could not resolve project dependencies: Missing:
[ERROR] ----------
[ERROR] 1) org.projectlombok:com.project.lombok:jar:1.16.8
[ERROR]
[ERROR] Try downloading the file manually from the project website.
[ERROR]
[ERROR] Then, install it using the command:
[ERROR] mvn install:install-file -DgroupId=org.projectlombok -DartifactId=com.project.lombok -Dversion=1.16.8 -Dpackaging=jar -Dfile=/path/to/file
[ERROR]
[ERROR] Alternatively, if you host your own repository you can deploy the file there:
[ERROR] mvn deploy:deploy-file -DgroupId=org.projectlombok -DartifactId=com.project.lombok -Dversion=1.16.8 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]
[ERROR]
[ERROR] Path to dependency:
[ERROR] 1) com.project:com.project.bbcode.parser:pom:1.0.0-SNAPSHOT
[ERROR] 2) org.projectlombok:com.project.lombok:jar:1.16.8
[ERROR]
[ERROR] ----------
[ERROR] 1 required artifact is missing.
[ERROR]
[ERROR] for artifact:
[ERROR] com.project:com.project.bbcode.parser:pom:1.0.0-SNAPSHOT
[ERROR]
[ERROR] from the specified remote repositories:
[ERROR] project-plugins (file:C:/Users/Khady/temp/repository, releases=false, snapshots=false),
[ERROR] eclipse-luna (http://download.eclipse.org/releases/luna, releases=false, snapshots=false),
[ERROR] central (https://repo.maven.apache.org/maven2, releases=true, snapshots=false),
[ERROR] projectlombok.org (http://projectlombok.org/mavenrepo, releases=true, snapshots=true)
[ERROR] -> [Help 1]
org.apache.maven.InternalErrorException: Internal error: java.lang.RuntimeException: Could not resolve project dependencies
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:121)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: java.lang.RuntimeException: Could not resolve project dependencies
at org.eclipse.tycho.p2.resolver.P2DependencyResolver.collectPomDependencies(P2DependencyResolver.java:276)
at org.eclipse.tycho.p2.resolver.P2DependencyResolver.computePreliminaryTargetPlatform(P2DependencyResolver.java:204)
at org.eclipse.tycho.core.resolver.DefaultTychoResolver.resolveProject(DefaultTychoResolver.java:109)
at org.eclipse.tycho.core.maven.TychoMavenLifecycleParticipant.afterProjectsRead(TychoMavenLifecycleParticipant.java:95)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:266)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
... 11 more
Caused by: org.apache.maven.artifact.resolver.MultipleArtifactsNotFoundException: Missing:
----------
1) org.projectlombok:com.project.lombok:jar:1.16.8
Try downloading the file manually from the project website.
Then, install it using the command:
mvn install:install-file -DgroupId=org.projectlombok - DartifactId=com.project.lombok -Dversion=1.16.8 -Dpackaging=jar -Dfile=/path/to/file
Alternatively, if you host your own repository you can deploy the file there:
mvn deploy:deploy-file -DgroupId=org.projectlombok -DartifactId=com.project.lombok -Dversion=1.16.8 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]
Path to dependency:
1) com.project:com.project.bbcode.parser:pom:1.0.0-SNAPSHOT
2) org.projectlombok:com.project.lombok:jar:1.16.8
----------
1 required artifact is missing.
for artifact:
com.project:com.project.bbcode.parser:pom:1.0.0-SNAPSHOT
from the specified remote repositories:
project-plugins (file:C:/Users/Khady/temp/repository, releases=false, snapshots=false),
eclipse-luna (http://download.eclipse.org/releases/luna, releases=false, snapshots=false),
central (https://repo.maven.apache.org/maven2, releases=true, snapshots=false),
projectlombok.org (http://projectlombok.org/mavenrepo, releases=true, snapshots=true)
at org.apache.maven.artifact.resolver.DefaultResolutionErrorHandler.throwErrors(DefaultResolutionErrorHandler.java:71)
at org.apache.maven.DefaultProjectDependenciesResolver.resolveImpl(DefaultProjectDependenciesResolver.java:164)
at org.apache.maven.DefaultProjectDependenciesResolver.resolve(DefaultProjectDependenciesResolver.java:76)
at org.apache.maven.DefaultProjectDependenciesResolver.resolve(DefaultProjectDependenciesResolver.java:60)
at org.eclipse.tycho.p2.resolver.P2DependencyResolver.collectPomDependencies(P2DependencyResolver.java:263)
... 17 more
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/InternalErrorException
```
My POM file (there is a parent POM by the way)
``` <?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.project</groupId>
<artifactId>com.project.bbcode.parser</artifactId>
<version>1.0.0-SNAPSHOT</version>
<packaging>eclipse-plugin</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<tycho-version>0.26.0</tycho-version>
</properties>
<repositories>
<repository>
<id>project-plugins</id>
<url>file:C:/Users/Khady/temp/repository</url>
<layout>p2</layout>
</repository>
<repository>
<id>eclipse-luna</id>
<layout>p2</layout>
<url>http://download.eclipse.org/releases/luna</url>
</repository>
<repository>
<snapshots>
<enabled>false</enabled>
</snapshots>
<id>central</id>
<name>Central Repository</name>
<url>https://repo.maven.apache.org/maven2</url>
</repository>
<repository>
<id>projectlombok.org</id>
<url>http://projectlombok.org/mavenrepo</url>
</repository>
</repositories>
<build>
<sourceDirectory>src/main/java</sourceDirectory>
<testSourceDirectory>test/main/groovy</testSourceDirectory>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.groovy</include>
</includes>
</resource>
</resources>
<testResources>
<testResource>
<directory>test/main/groovy</directory>
<includes>
<include>**/*.groovy</include>
</includes>
<excludes>
<exclude>**/*.java</exclude>
</excludes>
</testResource>
</testResources>
<plugins>
<plugin> <!-- enable the Tycho build extension -->
<groupId>org.eclipse.tycho</groupId>
<artifactId>tycho-maven-plugin</artifactId>
<version>0.26.0</version>
<extensions>true</extensions>
</plugin>
<plugin> <!-- To compile java code -->
<groupId>org.eclipse.tycho</groupId>
<artifactId>tycho-compiler-plugin</artifactId>
<version>0.26.0</version>
<configuration>
<compilerArgs>
<arg>-warn:-raw,unchecked</arg>
</compilerArgs>
</configuration>
</plugin>
<plugin> <!-- To run tests -->
<groupId>org.eclipse.tycho</groupId>
<artifactId>tycho-surefire-plugin</artifactId>
<version>0.26.0</version>
<configuration> <!-- for UI test -->
<useUIHarness>true</useUIHarness>
</configuration>
</plugin>
<plugin>
<groupId>org.eclipse.tycho.extras</groupId>
<artifactId>tycho-p2-extras-plugin</artifactId>
<version>${tycho-version}</version>
<executions>
<execution>
<phase>prepare-package</phase>
<goals>
<goal>publish-features-and-bundles</goal>
</goals>
<configuration>
<compress>false</compress>
<artifactRepositoryLocation>/C:/Users/Khady/temp/repository</artifactRepositoryLocation>
<metadataRepositoryLocation>/mypath/target/repository</metadataRepositoryLocation>
<sourceLocation>/C:/Users/Khady/temp/plugins</sourceLocation>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.eclipse.tycho</groupId>
<artifactId>tycho-p2-repository-plugin</artifactId>
<version>${tycho-version}</version>
<configuration>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>verify-repository</goal>
<goal>archive-repository</goal>
</goals>
<configuration>
<compress>true</compress>
<includeAllDependencies>true</includeAllDependencies>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.eclipse.tycho</groupId>
<artifactId>tycho-p2-publisher-plugin</artifactId>
<version>${tycho-version}</version>
<configuration>
<publishArtifacts>true</publishArtifacts>
</configuration>
</plugin>
<plugin>
<groupId>org.eclipse.tycho</groupId>
<artifactId>target-platform-configuration</artifactId>
<version>${tycho-version}</version>
<configuration>
<resolver>p2</resolver>
<pomDependencies>consider</pomDependencies>
<ignoreTychoRepositories>true</ignoreTychoRepositories>
<environments>
<environment>
<os>win32</os>
<ws>win32</ws>
<arch>x86</arch>
</environment>
<environment>
<os>linux</os>
<ws>gtk</ws>
<arch>x86_64</arch>
</environment>
<environment>
<os>macosx</os>
<ws>cocoa</ws>
<arch>x86_64</arch>
</environment>
</environments>
</configuration>
</plugin>
</plugins>
<pluginManagement>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<compilerId>groovy-eclipse-compiler</compilerId>
<verbose>true</verbose>
<fork>true</fork>
<compilerArguments>
<javaAgentClass>lombok.launch.Agent</javaAgentClass>
</compilerArguments>
</configuration>
<dependencies>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-eclipse-compiler</artifactId>
<version>2.9.1-01</version>
</dependency>
<!-- for 2.8.0-01 and later you must have an explicit dependency on groovy-eclipse-batch -->
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-eclipse-batch</artifactId>
<version>2.3.7-01</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.16.8</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</pluginManagement>
</build>
<!-- DEPENDENCIES -->
<dependencies>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-all</artifactId>
<version>2.4.3</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.16.8</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.14.1</version>
<type>maven-plugin</type>
</dependency>
</dependencies>
</project>
```

Answer 1

Lombok acts a bit differently as a dependency. There are two ways of getting your lombok dependent code to work.
You can either add lombok as a dependency as shown below, then use mvn install to get it to work each time you do a mvn clean. Alternatively you can hit the Maven -> Update Project... found if you right click on the project in Eclipse every time you do a mvn clean. It should get lombok loaded back in again.
<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok-maven -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok-maven</artifactId>
<version>1.16.8.0</version>
</dependency>
I found all of this cubbersome so I looked into an alternative solution that doesn't require right click or mvn install after every mvn clean. I used delombok a powerful tool to convert lombok code to something your maven tycho compiler can digest. http://awhitford.github.io/lombok.maven/lombok-maven-plugin/delombok-mojo.html . Just add this to your pom and change the name of your source folder to src/main/lombok. Don't worry when it runs it will create/update the src/main/java folder with all delomboked code in it. So Maven will still use src/main/java as a source folder to compile all code.
<!--LOMBOK SCHBANG-->
<plugin>
<groupId>org.projectlombok</groupId>
<artifactId>lombok-maven-plugin</artifactId>
<version>1.16.8.0</version>
<executions>
<execution>
<id>delombok</id>
<phase>generate-sources</phase>
<goals>
<goal>delombok</goal>
</goals>
</execution>
<execution>
<id>test-delombok</id>
<phase>generate-test-sources</phase>
<goals>
<goal>testDelombok</goal>
</goals>
<configuration>
<addOutputDirectory>false</addOutputDirectory>
<sourceDirectory>src/test/java</sourceDirectory>
</configuration>
</execution>
</executions>
</plugin>
<!--To copy delomboked classes back into src folder-->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.3</version>
<executions>
<execution>
<id>copy-prod-resources</id>
<phase>process-resources</phase>
<goals>
<goal>copy-resources</goal>
</goals>
<configuration>
<outputDirectory>src/main/java</outputDirectory>
<resources>
<resource>
<directory>target/generated-sources/delombok</directory>
<filtering>false</filtering>
</resource>
</resources>
</configuration>
</execution>
</executions>
</plugin>