GWT and Spring Boot with gwt-maven-plugin

<?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>

<parent>
<artifactId>kurento-room</artifactId>
<groupId>org.kurento</groupId>
<version>6.1.1-SNAPSHOT</version>
</parent>

<artifactId>kurento-room-gwt</artifactId>
<packaging>jar</packaging>
<name>Kurento Room GWT</name>

<licenses>
<license>
<name>GNU Lesser General Public License</name>
<url>http://www.gnu.org/licenses/lgpl-2.1.txt</url>
<distribution>repo</distribution>
</license>
</licenses>

<organization>
<name>Kurento</name>
<url>http://www.kurento.org</url>
</organization>

<scm>
<url>${kurento-room.scm.url}</url>
<connection>scm:git:${kurento-room.scm.connection}</connection>
<developerConnection>scm:git:${kurento-room.scm.connection}</developerConnection>
<tag>develop</tag>
</scm>

<properties>
<!-- Convenience property to set the GWT version -->
<gwtVersion>2.8.0-SNAPSHOT</gwtVersion>

<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

<start-class>org.kurento.room.gwt.server.KurentoRoomDemoApp</start-class>
</properties>

<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt</artifactId>
<version>${gwtVersion}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>

<build>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>false</filtering>
</resource>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
<includes>
<include>banner.txt</include>
</includes>
</resource>
</resources>

<plugins>
<!-- GWT Maven Plugin -->
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>2.7.0</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
</goals>
</execution>
</executions>
<configuration>
<extraJvmArgs>-Xmx6g </extraJvmArgs>
<logLevel>INFO</logLevel>
<style>${gwt.style}</style>
<bindAddress>0.0.0.0</bindAddress>
<webappDirectory>src/main/resources/static</webappDirectory>
<supoerDevMode>true</supoerDevMode>
<runTarget>index.html</runTarget>
<draftCompile>true</draftCompile>
<jsInteropMode>JS</jsInteropMode>
<enableAssertions>false</enableAssertions>
<modules>
<module>org.kurento.room.gwt.KurentoRoomGwt</module>
</modules>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<mainClass>${start-class}</mainClass>
<layout>ZIP</layout>
</configuration>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<executions>
<execution>
<id>java</id>
<goals>
<goal>java</goal>
</goals>
</execution>
</executions>
<configuration>
<mainClass>${start-class}</mainClass>
</configuration>
</plugin>

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<descriptor>src/assembly/bin.xml</descriptor>
<finalName>${project.artifactId}-${project.version}</finalName>
<appendAssemblyId>false</appendAssemblyId>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-antrun-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<configuration>
<tasks>
<copy
file="${project.build.directory}/target/${project.artifactId}-${project.version}-bin.zip"
tofile="${project.build.directory}/target/${project.artifactId}-${project.version}.zip" />
</tasks>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>

<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.1.0.Final</version>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-user</artifactId>
<scope>provided</scope>
<exclusions>
<exclusion>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-dev</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.kurento</groupId>
<artifactId>kurento-room-server</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.commons</groupId>
<artifactId>commons-logging</artifactId>
</exclusion>
</exclusions>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.kurento</groupId>
<artifactId>kurento-room-client-js</artifactId>
<version>6.1.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j</artifactId>
</dependency>

</dependencies>


</project>

Hi all,

I am trying to integrate GWT in a given spring boot project (Kurento Room). Everything looks good until I launch SpringBoot. The error that I see is:

Caused by: java.lang.IncompatibleClassChangeError: Implementing class

over some server classes. After googling a bit, normally that is because I have two versions of the same library/classes in my Tomcat. So far so good.

The thing is if I comment in my pom.xml everything related gwt (gwt-maven-plugin, gwt's dependencies...) the problem disappears.  The gwt classes are minimal, just an empty EntryPoint with an:

 

Window.alert("Hello World"); 

 

So, I imagine is something related with gwt-maven-plugin. What am I missing? Can you give me some ideas?

Some notes:

I have searched inside the final jar and using "find" command only shows one class.

I have run the duplicate-maven-plugin and there is no strange things related with the classes.

I am running in GWT 2.8-SNAPSHOT with 2.7.0 maven plugin. Java 1.8 

I have attached pom.xml and exception stack strace( https://docs.google.com/document/d/1LuJ5oJ4rwbMl9Wbx881XyN5GwI2mCdhKk6L_RdIIoCM/edit?usp=sharing ) just in case I am missing something. 

Thanks in advance,

Adolfo. 

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