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Generate allure report with mvn allure:report

I am trying to build allure report with mvn allure:report command, but after that I get 404 Not found error inside my report.
Below is my pom.xml file:
<?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>framework.testowy</groupId>
<artifactId>framework-testowy</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.source>1.8</maven.compiler.source>
<!-- Dependency versions -->
<selenium.version>3.141.59</selenium.version>
<testng.version>7.3.0</testng.version>
<drivermanager.version>3.8.1</drivermanager.version>
<metalloid.version>2.2.0</metalloid.version>
<allure.version>2.13.6</allure.version>
<!-- Configurable variables -->
<threads>2</threads>
<browser>firefox</browser>
<!-- Selenium Grid variables -->
<remote>false</remote>
<seleniumGridURL>http://127.0.0.1:4444/wd/hub</seleniumGridURL>
<platform></platform>
<browserVersion></browserVersion>
<!-- Allure -->
<aspectj.version>1.8.10</aspectj.version>
<allure.directory>target/allure-results</allure.directory>
</properties>
<build>
<plugins>
<plugin>
<groupId>io.qameta.allure</groupId>
<artifactId>allure-maven</artifactId>
<version>2.8</version>
<configuration>
<reportVersion>2.4.1</reportVersion>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>3.0.0-M5</version>
<configuration>
<argLine>
-javaagent:"${settings.localRepository}/org/aspectj/aspectjweaver/${aspectj.version}/aspectjweaver-${aspectj.version}.jar"
</argLine>
<parallel>methods</parallel>
<threadCount>${threads}</threadCount>
<systemPropertyVariables>
<browser>${browser}</browser>
<remoteDriver>${remote}</remoteDriver>
<gridURL>${seleniumGridURL}</gridURL>
<desiredPlatform>${platform}</desiredPlatform>
<desiredBrowserVersion>${browserVersion}</desiredBrowserVersion>
<allure.results.directory>${allure.directory}</allure.results.directory>
</systemPropertyVariables>
</configuration>
<dependencies>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>${aspectj.version}</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<!-- https://mvnrepository.com/artifact/org.seleniumhq.selenium/selenium-java -->
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-java</artifactId>
<version>${selenium.version}</version>
</dependency>
<dependency>
<!-- https://mvnrepository.com/artifact/org.testng/testng -->
<groupId>org.testng</groupId>
<artifactId>testng</artifactId>
<version>${testng.version}</version>
</dependency>
<!-- https://github.com/bonigarcia/webdrivermanager -->
<dependency>
<groupId>io.github.bonigarcia</groupId>
<artifactId>webdrivermanager</artifactId>
<version>${drivermanager.version}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.github.metalloid-project/page-factory -->
<dependency>
<groupId>com.github.metalloid-project</groupId>
<artifactId>metalloid-page-factory</artifactId>
<version>${metalloid.version}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/io.qameta.allure/allure-testng -->
<dependency>
<groupId>io.qameta.allure</groupId>
<artifactId>allure-testng</artifactId>
<version>${allure.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
mvn test command generates allure-results folder inside project's root folder/target
After that, command mvn allure:serve successfully generates following report:
Then if I execute mvn allure:report command new folder is generated under target/site/allure-maven-plugin with index.html inside it but it looks like this:
Does anyone know how to fix that and what is the cause? Thank you in advance.

How to use a maven to download jars with all dependencies?

Since I need to download a lot of jars/dependencies to create a special JRE distribution for special application, to avoid to download on maven repository web site.
I created an project on Maven, put my dependencies on pom.xml and it has been downloaded all jars "~.m2/repository" (user folder) but it's very difficult to get jar by jar of the ".m2/repository" folder, and I really dont know what my project uses since this folder contains all jars from all projects.
Has any magic command copy only the jars of my project needs?

Yes,
As you did, create a app, edit you pom.xml, and put all your dependencies into dependencies block.
<dependencies>
<dependency>
<groupId>org.deeplearning4j</groupId>
<artifactId>deeplearning4j-core</artifactId>
<version>1.0.0-beta5</version>
</dependency>
<dependency>
<groupId>org.deeplearning4j</groupId>
<artifactId>deeplearning4j-modelimport</artifactId>
<version>1.0.0-beta5</version>
</dependency>
<dependency>
<groupId>org.nd4j</groupId>
<artifactId>nd4j-native-platform</artifactId>
<version>1.0.0-beta5</version>
</dependency>
<dependency>
<groupId>com.google.cloud.dataflow</groupId>
<artifactId>google-cloud-dataflow-java-sdk-all</artifactId>
<version>2.5.0</version>
</dependency>
</dependencies>
Then ou can create your package, open a terminal navigate to your project and execute the command:
mvn package
After the BUILD you can copy only the jars that the project uses (also all dependencies), using the next command:
mvn dependency:copy-dependencies
And check the folder "target/dependency" and all jars will be stored into this folder, and you can copy this for your JRE/lib/ext.

You can use maven-dependency-plugin for this. See below sample pom.xml file.
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>org.learn</groupId>
<artifactId>stack-overflow</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>com.googlecode.json-simple</groupId>
<artifactId>json-simple</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>org.dbunit</groupId>
<artifactId>dbunit</artifactId>
<version>2.6.0</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>copy</id>
<phase>package</phase>
<goals>
<goal>copy</goal>
</goals>
</execution>
</executions>
<configuration>
<artifactItems>
<artifactItem>
<groupId>org.dbunit</groupId>
<artifactId>dbunit</artifactId>
<version>2.6.0</version>
<overWrite>false</overWrite>
</artifactItem>
<artifactItem>
<groupId>com.googlecode.json-simple</groupId>
<artifactId>json-simple</artifactId>
<version>1.1.1</version>
</artifactItem>
</artifactItems>
<outputDirectory>C:/Temp</outputDirectory>
</configuration>
</plugin>
</plugins>
</build>
</project>
For more details on using this plugin, hear over to
https://maven.apache.org/plugins/maven-dependency-plugin/examples/copying-artifacts.html
Edit:
Sorry, since you want to copy all the dependencies, you can use below configuration.
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>org.learn</groupId>
<artifactId>stack-overflow</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>com.googlecode.json-simple</groupId>
<artifactId>json-simple</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>org.dbunit</groupId>
<artifactId>dbunit</artifactId>
<version>2.6.0</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<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>C:/Temp</outputDirectory>
<overWriteReleases>false</overWriteReleases>
<overWriteSnapshots>false</overWriteSnapshots>
<overWriteIfNewer>true</overWriteIfNewer>
<excludeTransitive>true</excludeTransitive><!-- Use this if you want
to copy only the dependencies that you deplacred. -->
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>

when I run java Maven Project from cmd I get MojoExecutionException

I have problem by running Maven-Project from command_line
I used this command in cmd to run class named mainClass
mvn -e exec:java -Dexec.mainClass="com.example.Main"
and here is what I have in my pom 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>Linux</groupId>
<artifactId>Linux</artifactId>
<version>1.0</version>
<dependencies>
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-java</artifactId>
<version>2.37.1</version>
</dependency>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-all</artifactId>
<!-- Needs to be the same version that REST Assured depends on -->
<version>2.1.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.1</version>
</dependency>
</dependencies>
</project>
I get Mojo Exception caused by class not found exception, but actually I don't know where I should provide the name or the path to the class I want to run
this is the response of the command in command-line

I have modified your Maven pom.xml and added Maven mojo plugin. You can find below the code.
First you have to build project and then you can execute the Main java class.
Here, follow the steps.
Go to command prompt and go to the project/directory containing pom.xml.
Type the command mvnw clean package. I have used maven wrapper.
Then type command mvnw exec:java -Dexec.mainClass="com.so.help.maven.Main"
You can find the sample project in github.
<?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>execute-java-maven</groupId>
<artifactId>execute-java-maven</artifactId>
<version>1.0-SNAPSHOT</version>
<name>execute-java-maven</name>
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.9</version>
</dependency>
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-java</artifactId>
<version>2.37.1</version>
</dependency>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-all</artifactId>
<!-- Needs to be the same version that REST Assured depends on -->
<version>2.1.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
</dependency>
</dependencies>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.6.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.6.0</version>
<configuration>
<executable>java</executable>
<arguments>
<argument>com.so.help.maven.Main</argument>
</arguments>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>

Maven upgraded DROOLS version and now can no longer build

I am new to maven and java. I am working on a Java/DROOLS project. I was experiencing errors which seemed to be fixed with the next version of DROOLS. I changed the version in my pom.xml and then did mvn package.
The files were downloaded but every line of code that references DROOLS throws a compile error of package org.drools does not exist.
[ERROR] /C:/Dev/src/main/java/com/company/project/drools/client/DroolsRulesRunner.java:[11,18] package org.drools does not exist
[ERROR] /C:/Dev/src/main/java/com/company/project/drools/client/DroolsRulesRunner.java:[12,29] package org.drools.definition does not exist
Any help would be greatly appreciated.
Edit
Here is my 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.bericotechnologies</groupId>
<artifactId>sbt-rules</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>my-app</name>
<url>http://maven.apache.org</url>
<properties>
<drools.version>7.6.0.Final</drools.version>
<jbpm5.version>7.6.0.Final</jbpm5.version>
</properties>
<dependencies>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-jdk14</artifactId>
<version>1.7.12</version>
</dependency>
<dependency>
<groupId>org.jbpm</groupId>
<artifactId>jbpm-flow</artifactId>
<version>${jbpm5.version}</version>
</dependency>
<dependency>
<groupId>org.jbpm</groupId>
<artifactId>jbpm-bpmn2</artifactId>
<version>${jbpm5.version}</version>
</dependency>
<dependency>
<groupId>org.jbpm</groupId>
<artifactId>jbpm-flow-builder</artifactId>
<version>${jbpm5.version}</version>
</dependency>
<dependency>
<groupId>pl.maciejwalkowiak</groupId>
<artifactId>junit-drools</artifactId>
<version>1.0</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-all</artifactId>
<version>1.3</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
<version>2.9</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-compiler</artifactId>
<version>${drools.version}</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.core</artifactId>
<version>2.6.3</version>
</dependency>
<dependency>
<groupId>com.microsoft.sqlserver</groupId>
<artifactId>sqljdbc4</artifactId>
<version>4.0</version>
</dependency>
<dependency>
<groupId>com.microsoft.sqlserver</groupId>
<artifactId>sqljdbc</artifactId>
<version>4.0</version>
</dependency>
<dependency>
<groupId>org.rzo.yajsw</groupId>
<artifactId>wrapper</artifactId>
<version>11.11</version>
</dependency>
<dependency>
<groupId>org.rzo.yajsw</groupId>
<artifactId>wrapperApp</artifactId>
<version>11.11</version>
</dependency>
</dependencies>
<repositories>
<repository>
<id>jboss</id>
<name>jboss</name>
<url>https://repository.jboss.org/nexus/content/groups/public/</url>
</repository>
<repository>
<id>maciejwalkowiak.pl</id>
<url>https://github.com/maciejwalkowiak/maven-repo/raw/releases/</url>
</repository>
</repositories>
<build>
<resources>
<resource>
<directory>src/main/rules</directory>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<groupId>com.google.code.sortpom</groupId>
<artifactId>maven-sortpom-plugin</artifactId>
<version>2.3.0</version>
<executions>
<execution>
<phase>verify</phase>
<goals>
<goal>sort</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>com.berico.psip.run.RunDroolsService</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
</project>
The only thing that I changed is
<properties>
<drools.version>5.6.0.Final</drools.version>
<jbpm5.version>5.5.0.Final</jbpm5.version>
</properties>
to
<properties>
<drools.version>7.6.0.Final</drools.version>
<jbpm5.version>7.6.0.Final</jbpm5.version>
</properties>
If I change it back everything works fine. I can see the 7.6.0.Final jars in the repository.

You have broken imports and you have to fix them.
There's changes in the package structure of Drools between versions 5.6.0.Final and 7.6.0.Final. The package "definitions" is now under org.drools.core.definitions (v7.6.0.Final) and not under org.drools.definitions (5.6.0.Final).
You need to remove all imports beginning with org.drools in your classes and re-import the missing Drools classes again with the new package locations - those from version 7.6.0.Final.

gwt-maven-plugin runs permutations even when there are no changes

We are using GWT in our product with mojo gwt-maven-plugin 2.4 to compile the GWT code.
But we observed that when we run mvn install, the gwt maven plugin is running the permutations even when no code changes are made to GWT code.
After struggling on this issue for quite some time, we were able to reproduce it with a simple setup using 2 maven projects:
1st project(MyGwtMavenSampleSource) : Contains the GWT code along with the gwt module xml file
2nd project (MavenBuilderMod): Contains the MyGwtMavenSampleSource as maven dependency and will build the war
file.
Below are the poms for both the projects:
1st Project: MyGwtMavenSampleSource
<?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">
<!-- POM file generated with GWT webAppCreator -->
<modelVersion>4.0.0</modelVersion>
<groupId>GWTMavenPlugin</groupId>
<artifactId>MyGwtMavenSampleSource</artifactId>
<packaging>jar</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>GWT Maven Archetype</name>
<properties>
<!-- Convenience property to set the GWT version -->
<gwtVersion>2.4.0</gwtVersion>
<!-- GWT needs at least java 1.5 -->
<webappDirectory>${project.build.directory}/${project.build.finalName}</webappDirectory>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-servlet</artifactId>
<version>${gwtVersion}</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-user</artifactId>
<version>${gwtVersion}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.7</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.0.0.GA</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.0.0.GA</version>
<classifier>sources</classifier>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.*</include>
</includes>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.*</include>
</includes>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
2nd Project: MavenBuilderMod
<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>GWTMavenPlugin</groupId>
<artifactId>MavenBuilderMod</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<properties>
<!-- Convenience property to set the GWT version -->
<gwtVersion>2.4.0</gwtVersion>
<!-- GWT needs at least java 1.5 -->
<webappDirectory>${project.build.directory}/${project.build.finalName}</webappDirectory>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-servlet</artifactId>
<version>${gwtVersion}</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-user</artifactId>
<version>${gwtVersion}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.7</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.0.0.GA</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.0.0.GA</version>
<classifier>sources</classifier>
<scope>test</scope>
</dependency>
<dependency>
<groupId>GWTMavenPlugin</groupId>
<artifactId>MyGwtMavenSampleSource</artifactId>
<version>0.0.1-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
</dependencies>
<build>
<outputDirectory>${webappDirectory}/WEB-INF/classes</outputDirectory>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.8</version>
<executions>
<execution>
<id>src-dependencies</id>
<phase>package</phase>
<goals>
<goal>unpack-dependencies</goal>
</goals>
<configuration>
<classifier>sources</classifier>
<failOnMissingClassifierArtifact>false</failOnMissingClassifierArtifact>
<outputDirectory>${project.build.directory}/sources</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
<!-- GWT Maven Plugin -->
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>2.4.0</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
</goals>
</execution>
</executions>
<!-- Plugin configuration. There are many available options, see
gwt-maven-plugin documentation at codehaus.org -->
<configuration>
<runTarget>MyGwtMavenSampleSource.html</runTarget>
<hostedWebapp>${webappDirectory}</hostedWebapp>
<modules>
<module>com.ca.gwt.maven.sample.MyGwtMavenSampleSource</module>
</modules>
</configuration>
</plugin>
<!-- Copy static web files before executing gwt:run -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.1.1</version>
<executions>
<execution>
<phase>compile</phase>
</execution>
</executions>
<configuration>
<webappDirectory>${webappDirectory}</webappDirectory>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.5</source>
<target>1.5</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
So, the question is, how can we make gwt-maven-plugin / compiler to run the permutations only on code change in this kind of setup.
Note: This works as expected (i.e permutations are run only when the code is changed) if gwt module xml file is placed in the same maven module that contains the gwt-maven-plugin

The root issue is Maven's broken support for incremental builds, and possibly broken incremental-build support in the gwt-maven-plugin (particularly if you're still using a more-than-2-year-old version!).
The gwt-maven-plugin somehow sees that the gwt.xml file has changed (track the build of your first module, ideally it should really be a no-op if nothing changed; re-copying the resources and/or rebuilding the JAR would probably be enough to trigger the issue downwards), and particularly is more recent than the nocache.js file it produced.
I think a better setup is to run the gwt-maven-plugin in the first module and package everything in a ZIP or WAR, that you can then use as a WAR overlay. It unfortunately makes running DevMode a bit harder, but it's workable.