Develop Reference

I cannot compile my javafx maven project on Raspberry pi

I created a java project which compiles and runs fine on my mac with "mvn compile". But once I fetch it from gitlab on my Pi it won't compile on linux.
I consulted many pages but none seem to apply to this particular issue.
Can anyone help me? I would be really grateful!
The error:
[INFO] Scanning for projects...
[INFO]
[INFO] ----------------------< SmartMirror:SmartMirror >-----------------------
[INFO] Building SmartMirror 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.816 s
[INFO] Finished at: 2022-07-23T14:54:44+02:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project SmartMirror: Could not resolve dependencies for project SmartMirror:SmartMirror:jar:0.0.1-SNAPSHOT: The following artifacts could not be resolved: org.openjfx:javafx-controls:jar:${javafx.platform}:19-ea+9, org.openjfx:javafx-graphics:jar:${javafx.platform}:19-ea+9, org.openjfx:javafx-base:jar:${javafx.platform}:19-ea+9, org.openjfx:javafx-fxml:jar:${javafx.platform}:19-ea+9: Failure to find org.openjfx:javafx-controls:jar:${javafx.platform}:19-ea+9 in https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced -> [Help 1]
[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/DependencyResolutionException
The POM.xml file:
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>SmartMirror</groupId>
<artifactId>SmartMirror</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<mainClass>main.Main</mainClass>
<maven.compiler.source>1.9</maven.compiler.source>
<maven.compiler.target>1.9</maven.compiler.target>
<javafx.platform>linux</javafx.platform>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.3.0</version>
<executions>
<execution>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<shadedArtifactAttached>true</shadedArtifactAttached>
<transformers>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>main.Main</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.10.1</version>
</plugin>
<plugin>
<groupId>org.openjfx</groupId>
<artifactId>javafx-maven-plugin</artifactId>
<version>0.0.8</version>
<configuration>
<mainClass>Main</mainClass>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.openjfx/javafx-controls -->
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-controls</artifactId>
<version>19-ea+9</version>
<classifier>linux</classifier>
</dependency>
<!-- https://mvnrepository.com/artifact/org.openjfx/javafx-fxml -->
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-fxml</artifactId>
<version>19-ea+9</version>
<classifier>linux</classifier>
</dependency>
<dependency>
<groupId>com.mashape.unirest</groupId>
<artifactId>unirest-java</artifactId>
<version>1.4.9</version>
</dependency>
</dependencies>
</project>
The module-info.java file:
module SmartMirror {
exports weather to javafx.graphics, javafx.fxml;
exports main to javafx.graphics, javafx.fxml;
opens weather to javafx.graphics, javafx.fxml;
opens main to javafx.graphics, javafx.fxml;
requires javafx.base;
requires javafx.controls;
requires javafx.fxml;
requires transitive javafx.graphics;
requires transitive json;
}
Edit:
Thank you so far for your answers. Though the issue persists. Any more ideas?

I used this command on Raspberry Pi 3B (Raspberry Pi OS lite 32bit) :
mvn -Djavafx.platform=linux-arm32-monocle clean compile
if you use 64bit version :
mvn -Djavafx.platform=linux-aarch64-monocle clean compile

Maven including non-defined dependencies

My Maven is failing with the following error:
[ERROR] Failed to execute goal on project sdcf4j-twitch: Could not resolve dependencies for project com.github.twitch4j:sdcf4j-twitch:jar:1.0.9: Failed to collect dependencies at com.github.twitch4j:twitch4j:jar:v0.10.2 -> org.projectlombok:lombok:jar:+: Failed to read artifact descriptor for org.projectlombok:lombok:jar:+: Could not transfer artifact org.projectlombok:lombok:pom:+ from/to jitpack.io (https://jitpack.io): Transfer failed for https://jitpack.io/org/projectlombok/lombok/+/lombok-+.pom 400 Bad Request -> [Help 1]
I already tried completely wiping Intellij IDEA's files, and re-adding the dependencies, which didn't help with the error, but some wrong dependencies, that my IDE displayed.
Of course I already tried without any lombok plugin, (lombok) annotation paths and a mvn clear, but that didn't help either.
The Maven code for that project is the following:
<?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>
<parent>
<groupId>de.btobastian.sdcf4j</groupId>
<artifactId>sdcf4j</artifactId>
<version>1.0.9</version>
</parent>
<groupId>com.github.twitch4j</groupId>
<artifactId>sdcf4j-twitch</artifactId>
<version>1.0.9</version>
<repositories>
<repository>
<id>jcenter</id>
<url>https://jcenter.bintray.com/</url>
</repository>
<repository>
<id>jitpack.io</id>
<url>https://jitpack.io</url>
</repository>
</repositories>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<annotationProcessorPaths>
<path>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.16</version>
</path>
</annotationProcessorPaths>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<!-- Include source -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<version>2.0.4</version>
<executions>
<execution>
<id>attach-sources</id>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>
<!-- Include JavaDocs -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<version>2.10.2</version>
<executions>
<execution>
<id>attach-javadocs</id>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
<configuration>
<stylesheet>java</stylesheet>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<!-- The core module -->
<dependency>
<groupId>de.btobastian.sdcf4j</groupId>
<artifactId>sdcf4j-core</artifactId>
<version>${project.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.github.twitch4j</groupId>
<artifactId>twitch4j</artifactId>
<version>v0.10.2</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.16</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
The Parent Pom does not differ from the original at https://github.com/Bastian/sdcf4j/blob/8f569ee5dc36be09c6595c12833d109b7127c23e/pom.xml.
If one sets up the folders correctly, you can add sdcf4j-twitch as a module in sdcf4j, just like sdcf4j-core,sdcf4j-discord4j in L17
Complete Build log:
[INFO] Scanning for projects...
[INFO]
[INFO] -----------------< com.github.twitch4j:sdcf4j-twitch >------------------
[INFO] Building sdcf4j-twitch 1.0.9
[INFO] --------------------------------[ jar ]---------------------------------
Downloading from jitpack.io: https://jitpack.io/org/projectlombok/lombok/+/lombok-+.pom
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.968 s
[INFO] Finished at: 2020-12-10T22:55:31+01:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project sdcf4j-twitch: Could not resolve dependencies for project com.github.twitch4j:sdcf4j-twitch:jar:1.0.9: Failed to collect dependencies at com.github.twitch4j:twitch4j:jar:v0.10.2 -> org.projectlombok:lombok:jar:+: Failed to read artifact descriptor for org.projectlombok:lombok:jar:+: Could not transfer artifact org.projectlombok:lombok:pom:+ from/to jitpack.io (https://jitpack.io): Transfer failed for https://jitpack.io/org/projectlombok/lombok/+/lombok-+.pom 400 Bad Request -> [Help 1]
[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/DependencyResolutionException

Java modules not working with aspectj-maven-plugin

I am trying to migrate my java project to 11 and using modules, but it seems that the aspectj compiler does not recognise modules from my maven dependencies?
Error:
mvn clean compile
[INFO] Scanning for projects...
[INFO]
[INFO] ---------------------------< com.test:test >----------------------------
[INFO] Building test 1
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) # test ---
[INFO] Deleting /Users/piotr/Documents/mvntest/target
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) # test ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /Users/piotr/Documents/mvntest/src/main/resources
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) # test ---
[INFO] Required filename-based automodules detected: [passay-1.6.0.jar]. Please don't publish this project to a public artifact repository!
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 2 source files to /Users/piotr/Documents/mvntest/target/classes
[INFO]
[INFO] --- aspectj-maven-plugin:1.12.6:compile (default) # test ---
[INFO] Showing AJC message detail for messages of types: [error, warning, fail]
[ERROR] passay cannot be resolved to a module
/Users/piotr/Documents/mvntest/src/main/java/module-info.java:2
requires passay;
^
[ERROR] Must declare a named package because this compilation unit is associated to the named module 'test'
/Users/piotr/Documents/mvntest/src/main/java/main.java:1
(no source information available)
[ERROR] The type org.passay.PasswordValidator is not accessible
/Users/piotr/Documents/mvntest/src/main/java/main.java:1
import org.passay.PasswordValidator;
^^^^^^^^^^^^^^^^^^^^^^^^^^^
[ERROR] PasswordValidator cannot be resolved to a type
/Users/piotr/Documents/mvntest/src/main/java/main.java:5
System.out.println(new PasswordValidator());
^^^^^^^^
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.169 s
[INFO] Finished at: 2020-12-14T10:22:00+01:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal com.nickwongdev:aspectj-maven-plugin:1.12.6:compile (default) on project test: AJC compiler errors:
[ERROR] error at requires passay;
[ERROR] ^
[ERROR] /Users/piotr/Documents/mvntest/src/main/java/module-info.java:2:0::0 passay cannot be resolved to a module
[ERROR] error at (no source information available)
[ERROR] /Users/piotr/Documents/mvntest/src/main/java/main.java:1:0::0 Must declare a named package because this compilation unit is associated to the named module 'test'
[ERROR] error at import org.passay.PasswordValidator;
[ERROR] ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[ERROR] /Users/piotr/Documents/mvntest/src/main/java/main.java:1:0::0 The type org.passay.PasswordValidator is not accessible
[ERROR] error at System.out.println(new PasswordValidator());
[ERROR] ^^^^^^^^
[ERROR] /Users/piotr/Documents/mvntest/src/main/java/main.java:5:0::0 PasswordValidator cannot be resolved to a type
[ERROR]
[ERROR] -> [Help 1]
[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/MojoExecutionException
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>com.test</groupId>
<artifactId>test</artifactId>
<packaging>jar</packaging>
<version>1</version>
<properties>
<java.version>11</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<aspectj.version>1.9.6</aspectj.version>
</properties>
<dependencies>
<dependency>
<groupId>org.passay</groupId>
<artifactId>passay</artifactId>
<version>1.6.0</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>${aspectj.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<release>${java.version}</release>
</configuration>
</plugin>
<plugin>
<groupId>com.nickwongdev</groupId>
<artifactId>aspectj-maven-plugin</artifactId>
<version>1.12.6</version>
<dependencies>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjtools</artifactId>
<version>${aspectj.version}</version>
</dependency>
</dependencies>
<configuration>
<complianceLevel>${java.version}</complianceLevel>
<weaveMainSourceFolder>true</weaveMainSourceFolder>
</configuration>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>test-compile</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
src/main/java/module-info.java:
module test {
requires passay;
}
src/main/java/main.java:
import org.passay.PasswordValidator;
public class main {
public static void main() {
System.out.println(new PasswordValidator());
}
}

In order for this to work the AspectJ Maven plugin would have to support at least the command line parameter --module-info for the AspectJ compiler ajc, analogous to javac. That the parameter exists is not documented in the ajc command line help but indirectly in the AspectJ 1.9.0 release notes.
I have never worked with Java 9+ modules before, even though I use recent Java versions for other reasons. I had to experiment a bit in order to find out how to compile and run your project from the command line, and basically it was something like this:
ajc -11 --module-path "C:\Users\alexa\.m2\repository\org\passay\passay\1.6.0\passay-1.6.0.jar" -cp "C:\Users\alexa\.m2\repository\org\aspectj\aspectjrt\1.9.6\aspectjrt-1.9.6.jar" -sourceroots src\main\java -outjar target\test-1.jar
java --module-path target\test-1.jar;C:\Users\alexa\.m2\repository\org\passay\passay\1.6.0\passay-1.6.0.jar;C:\Users\alexa\.m2\repository\org\aspectj\aspectjrt\1.9.6\aspectjrt-1.9.6.jar --module test/de.scrum_master.stackoverflow.q65286736.Application
Sorry, but I have moved your main class outside the default package like this (the main method was also pseudo code without any parameters):
module test {
requires passay;
}
package de.scrum_master.stackoverflow.q65286736;
import org.passay.PasswordValidator;
public class Application {
public static void main(String[] args) {
System.out.println(new PasswordValidator());
}
}
Then I experimentally added a parameter javaModules to the plugin, as you can see here in my pull request. Feel free to build it yourself by cloning my repository fork.
Then modify your POM 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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.test</groupId>
<artifactId>test</artifactId>
<packaging>jar</packaging>
<version>1</version>
<properties>
<java.version>11</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<aspectj.version>1.9.6</aspectj.version>
</properties>
<dependencies>
<dependency>
<groupId>org.passay</groupId>
<artifactId>passay</artifactId>
<version>1.6.0</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>${aspectj.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<release>${java.version}</release>
<useIncrementalCompilation>false</useIncrementalCompilation>
</configuration>
</plugin>
<plugin>
<groupId>com.nickwongdev</groupId>
<artifactId>aspectj-maven-plugin</artifactId>
<version>1.12.7-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjtools</artifactId>
<version>${aspectj.version}</version>
</dependency>
</dependencies>
<configuration>
<complianceLevel>${java.version}</complianceLevel>
<encoding>${project.build.sourceEncoding}</encoding>
<!--<weaveMainSourceFolder>true</weaveMainSourceFolder>-->
<showWeaveInfo>true</showWeaveInfo>
<Xlint>ignore</Xlint>
<!--<verbose>true</verbose>-->
<!--<warn>constructorName,packageDefaultMethod,deprecation,maskedCatchBlocks,unusedLocals,unusedArguments,unusedImport</warn>-->
<!--<argumentFileName>argumentFileName.txt</argumentFileName>-->
<javaModules>
<javaModule>
<groupId>org.passay</groupId>
<artifactId>passay</artifactId>
</javaModule>
</javaModules>
</configuration>
<executions>
<execution>
<phase>process-sources</phase>
<goals>
<goal>compile</goal>
<goal>test-compile</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
The decisive difference is of course the usage of the new parameter:
<javaModules>
<javaModule>
<groupId>org.passay</groupId>
<artifactId>passay</artifactId>
</javaModule>
</javaModules>
Now the project compiles and you can also run the application with the second command I posted above, i.e. java --module-path target\test-1.jar;.... For me IntelliJ IDEA recognised the new parameter in its POM syntax highlighting and also runs the application without any problems.
This is not full support for all Java module related parameters you can think of, but I think it is a starting point. Feedback welcome.

Cannot generate runnable JAR for very simple Eclipse Maven project

I would like to generate a runnable JAR for my Eclipse Java projects. The JAR should contain all my code, with unmodified namespaces, classes, resources etc.
My workspace is organized into a multitude of different projects.
When I right-click a project node in Project Explorer, and select "Run As > Maven install", I get the following:
[INFO] Scanning for projects...
[INFO]
[INFO] ---------------------< foo.Project1:foo.Project1 >----------------------
[INFO] Building foo.Project1 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[WARNING] The POM for foo.Project2:foo.Project2:jar:0.0.1-SNAPSHOT is missing, no dependency information available
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.220 s
[INFO] Finished at: 2020-06-26T12:20:11+02:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project foo.Project1: Could not resolve dependencies for project foo.Project1:foo.Project1:jar:0.0.1-SNAPSHOT: Could not find artifact foo.Project2:foo.Project2:jar:0.0.1-SNAPSHOT -> [Help 1]
[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/DependencyResolutionException
foo.Project1 runs fine under Eclipse. Its pom.xml file is:
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>foo.Project1</groupId>
<artifactId>foo.Project1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>foo.Project2</groupId>
<artifactId>foo.Project2</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
(A ZIP of the two projects can be accessed here: https://wetransfer.com/downloads/b9bb4aa840daa6e7b2dd2c793acdb56420200626103047/32c0fd)
I tried the first solution suggested in How can I create an executable JAR with dependencies using Maven? (with 2300+ score) by:
1: adding the following in the build section of the pom.xml:
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>foo.Project1.Application</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</plugin>
</plugins>
2: right-clicking the project node, then "Run As > Maven build..."
3: defining "Goals" as: clean compile assembly:single, and hitting Run
Same errors.
What am I doing wrong?

If you want to use foo.Project2 as dependency, you need to build it first with clean install.
You always need to build a project before you can use it as dependency in the Maven build.
Eclipse cheats a bit by also allowing you to reference projects from the workspace and therefore allows you to run the program. But for the "real build", you need to build everything in the right order.

Could not find goal 'devmode' in plugin org.codehaus.mojo

I am a beginner in GWT and Maven. I created a new GWT Application project in Eclipse. Then, I converted that project into Maven Project by right-click on Project name => Configure => Convert to Maven Project and I saw that a pom file was generated for that project. Next, I run as project as Maven build but it was not compiled since a goal was not specified there. Actually, I don't understand what exactly have I to write under that goal section, therefore, I wrote package under that and then again I built maven and it compiled successfully.
After that, I tried to run this maven project in Command Prompt on the SuperDevMode using the 2nd step mentioned on Run the GWT Project under the Setting up a new project section. But while following these steps on Command Prompt, I got an error that devmode could not be found. Here is my Command prompt log:
C:\Users\TEST>cd eclipse-workspace/MyWebApp
C:\Users\TEST\eclipse-workspace\MyWebApp>mvn war:exploded
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building MavenApp 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-war-plugin:3.1.0:exploded (default-cli) # abcdef ---
[INFO] Exploding webapp
[INFO] Assembling webapp [abcdef] in [C:\Users\TEST\eclipse-workspace\MyWebApp\target\abcdef-0.0.1-SNAPSHOT]
[INFO] Processing war project
[INFO] Webapp assembled in [63 msecs]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.920 s
[INFO] Finished at: 2017-08-30T11:24:53+05:30
[INFO] Final Memory: 12M/107M
[INFO] ------------------------------------------------------------------------
C:\Users\TEST\eclipse-workspace\MyWebApp>mvn gwt:devmode
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.301 s
[INFO] Finished at: 2017-08-30T11:25:02+05:30
[INFO] Final Memory: 8M/107M
[INFO] ------------------------------------------------------------------------
[ERROR] Could not find goal 'devmode' in plugin org.codehaus.mojo:gwt-maven-plugin:2.8.1 among available goals clean, compile, compile-report, css, debug, eclipse, eclipseTest, generateAsync, help, i18n, mergewebxml, resources, run, run-codeserver, source-jar, test -> [Help 1]
[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/MojoNotFoundException
Here is my pom.xml file:
<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>MyWebApp</groupId>
<artifactId>abcdef</artifactId>
<version>0.0.1-SNAPSHOT</version>
<build>
<sourceDirectory>src</sourceDirectory>
<testSourceDirectory>test</testSourceDirectory>
<resources>
<resource>
<directory>src</directory>
<excludes>
<exclude>**/*.java</exclude>
</excludes>
</resource>
</resources>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.6.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
<name>MavenApp</name>
<description>It is a maven app</description>
</project>
I searched a lot to resolve this error but found no solution for that issue. Please help me to fix this issue as I am very confused on how to fix it.
Edit: After further study, I used mvn gwt:run as an alternative to the command mvn gwt:devmode, but still I got another error on command prompt as given below:
[ERROR] Failed to execute goal org.codehaus.mojo:gwt-maven-plugin:2.8.1:run (default-cli) on project MyWebApp: The parameters 'runTarget' for goal org.codehaus.mojo:gwt-maven-plugin:2.8.1:run are missing or invalid

Without any more information than gwt:devmode, Maven will try to find an appropriate plugin, based on its default settings. It happens that a gwt-maven-plugin exists with org.codehaus.mojo as groupId, fitting in Maven built-in plugin resolution.
But this is not the plugin you're looking for.
You are probably trying to use this one, so just add this to your pom.xml, in the <plugins> section:
<plugin>
<groupId>net.ltgt.gwt.maven</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>1.0-rc-8</version>
<extensions>true</extensions>
<configuration>
<moduleName>com.example.app.App</moduleName>
</configuration>
</plugin>
Adapting the moduleName if needed.

Well, I was able to solve this issue by copying some dependencies, plugin, and configuration from the pom.xml file (which is generated in the project created by the webAppCreator using maven) to the pom.xml file of my project created in the Eclipse. So, this is my pom.xml file created finally:
<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>MyPersonalProject</groupId>
<artifactId>MyPersonalProject</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<!-- Setting maven.compiler.source to something different to 1.8
needs that you configure the sourceLevel in gwt-maven-plugin since
GWT compiler 2.8 requires 1.8 (see gwt-maven-plugin block below) -->
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<!-- Don't let your Mac use a crazy non-standard encoding -->
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
</properties>
<dependencyManagement>
<dependencies>
<!-- ensure all GWT deps use the same version (unless overridden) -->
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt</artifactId>
<version>2.8.1</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-servlet</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-user</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-dev</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>
<sourceDirectory>src</sourceDirectory>
<testSourceDirectory>test</testSourceDirectory>
<resources>
<resource>
<directory>src</directory>
<excludes>
<exclude>**/*.java</exclude>
</excludes>
</resource>
</resources>
<plugins>
<plugin>
<groupId>net.ltgt.gwt.maven</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>1.0-rc-6</version>
<executions>
<execution>
<goals>
<goal>import-sources</goal>
<goal>compile</goal>
<goal>import-test-sources</goal>
<goal>test</goal>
</goals>
</execution>
</executions>
<configuration>
<moduleName>mypackage.MyPersonalproject</moduleName>
<failOnError>true</failOnError>
<!-- GWT compiler 2.8 requires 1.8, hence define sourceLevel here if you use
a different source language for java compilation -->
<sourceLevel>1.8</sourceLevel>
<!-- Compiler configuration -->
<compilerArgs>
<!-- Ask GWT to create the Story of Your Compile (SOYC) (gwt:compile) -->
<arg>-compileReport</arg>
<arg>-XcompilerMetrics</arg>
</compilerArgs>
<!-- DevMode configuration -->
<warDir>${project.build.directory}/${project.build.finalName}</warDir>
<classpathScope>compile+runtime</classpathScope>
<!-- URL(s) that should be opened by DevMode (gwt:devmode). -->
<startupUrls>
<startupUrl>MyPersonalProject.html</startupUrl>
</startupUrls>
</configuration>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.6.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
When I run this application using maven in the Command Prompt, it ran successfully except showing 2 or 3 warnings in the Command Prompt log. Also, I noticed that the SNAPSHOT generated in the version is different for the pom.xml created by Eclipse as compared to the one created by the maven project on command prompt.