Maven build error: Failed to execute goal, missing a class
I'm trying to package the sample application from vaadin 7.0.0 with the maven plugin for eclipse, but every time a run the goal "package", building fails with the following error:
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project essai: Execution default-compile of goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile failed: A required class was missing while executing org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile: org/codehaus/plexus/compiler/util/scan/InclusionScanException
[ERROR] -----------------------------------------------------
[ERROR] realm = plugin>org.apache.maven.plugins:maven-compiler-plugin:2.3.2
[ERROR] strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
[ERROR] urls[0] = file:/C:/Users/Benoit/.m2/repository/org/apache/maven/plugins/maven-compiler-plugin/2.3.2/maven-compiler-plugin-2.3.2.jar
[ERROR] urls[1] = file:/C:/Users/Benoit/.m2/repository/org/codehaus/plexus/plexus-utils/1.1/plexus-utils-1.1.jar
[ERROR] Number of foreign imports: 1
[ERROR] import: Entry[import from realm ClassRealm[maven.api, parent: null]]
The result of mvn package -X is here: http://pastebin.com/jk5uW8Ut
My pom.xml is the following: http://maven.apache.org/maven-v4_0_0.xsd"> 4.0.0 com.mycompany essai war 0.0.1-SNAPSHOT Vaadin Web Application
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<vaadin.version>7.0.0.rc2</vaadin.version>
<vaadin.plugin.version>${vaadin.version}</vaadin.plugin.version>
</properties>
<repositories>
<repository>
<id>vaadin-addons</id>
<url>http://maven.vaadin.com/vaadin-addons</url>
</repository>
<repository>
<id>vaadin-snapshots</id>
<url>http://oss.sonatype.org/content/repositories/vaadin-snapshots/</url>
<releases>
<enabled>false</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>vaadin-snapshots</id>
<url>http://oss.sonatype.org/content/repositories/vaadin-snapshots/</url>
<releases>
<enabled>false</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>
<dependencies>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-server</artifactId>
<version>${vaadin.version}</version>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-client-compiled</artifactId>
<version>${vaadin.version}</version>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-client</artifactId>
<version>${vaadin.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-themes</artifactId>
<version>${vaadin.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.4</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
<!-- As we are doing "inplace" GWT compilation, ensure the widgetset -->
<!-- directory is cleaned properly -->
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>2.4.1</version>
<configuration>
<filesets>
<fileset>
<directory>src/main/webapp/VAADIN/widgetsets</directory>
</fileset>
</filesets>
</configuration>
</plugin>
<plugin>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-maven-plugin</artifactId>
<version>${vaadin.plugin.version}</version>
<configuration>
<extraJvmArgs>-Xmx512M -Xss1024k</extraJvmArgs>
<!-- <runTarget>mobilemail</runTarget> -->
<!-- We are doing "inplace" but into subdir VAADIN/widgetsets. This
way compatible with Vaadin eclipse plugin. -->
<webappDirectory>${basedir}/src/main/webapp/VAADIN/widgetsets
</webappDirectory>
<hostedWebapp>${basedir}/src/main/webapp/VAADIN/widgetsets
</hostedWebapp>
<noServer>true</noServer>
<!-- Remove draftCompile when project is ready -->
<draftCompile>false</draftCompile>
<compileReport>true</compileReport>
<style>OBF</style>
<strict>true</strict>
<runTarget>http://localhost:8080/</runTarget>
</configuration>
<executions>
<execution>
<configuration>
<!-- if you don't specify any modules, the plugin will find them -->
<!-- <modules> <module>com.vaadin.demo.mobilemail.gwt.ColorPickerWidgetSet</module>
</modules> -->
</configuration>
<goals>
<goal>resources</goal>
<goal>update-widgetset</goal>
<goal>compile</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.mortbay.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
</plugin>
</plugins>
<pluginManagement>
<plugins>
<!--This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself.-->
<plugin>
<groupId>org.eclipse.m2e</groupId>
<artifactId>lifecycle-mapping</artifactId>
<version>1.0.0</version>
<configuration>
<lifecycleMappingMetadata>
<pluginExecutions>
<pluginExecution>
<pluginExecutionFilter>
<groupId>com.vaadin</groupId>
<artifactId>
vaadin-maven-plugin
</artifactId>
<versionRange>
[7.0.0.rc2,)
</versionRange>
<goals>
<goal>resources</goal>
<goal>update-widgetset</goal>
<goal>compile</goal>
</goals>
</pluginExecutionFilter>
<action>
<ignore></ignore>
</action>
</pluginExecution>
</pluginExecutions>
</lifecycleMappingMetadata>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
I'm new to maven and even if I found many post about this error, I haven't been able to understand what could cause this error.
Answer
Here seems to be the problem:
[FATAL] Non-parseable POM C:\Users\Benoit.m2\repository\org\apache\maven\maven-parent\16\maven-parent-16.pom
Because of this error maven was unable to add to plugin's classpath all the necessary libraries.
I recommend you to remove everything under C:\Users\Benoit\.m2\repository\org\apache\maven\ and rebuild the project. This should help.