Generated sources being compiled twice - maven

Question

Using Eclipse Luna with m2eclipse, I have a parent Maven project (facturas_root) and two Maven modules inheriting from it (sharepoint_ws and api_sharepoint).
sharepoint_ws was to be used only to generate JAXWS classes to connect to the Sharepoint WebServices, so I downloaded the related WSDL and included those as resources of the project. At generate-sources phase, it works correctly and generates the sources in target\generated-sources\ws-consume\mypackage\.
Now, the issue is that I made api_sharepoint import the sharepoint_ws dependency, but it does not detect any class. I assumed that it was because the generated classes were not at src/main/java, so I added a plugin to copy them there. Now, the problem is that at the compile phase of sharepoint_ws, it finds twice the source file of each class and throws an error.
My pom.xml -> build
<plugins>
<!-- clean /src/main/java and /target/generated-sources -->
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>2.6.1</version>
<executions>
<execution>
<phase>generate-sources</phase>
<goals>
<goal>clean</goal>
</goals>
<configuration>
<filesets>
<fileset>
<directory>${basedir}/src/main/java/es</directory>
</fileset>
<fileset>
<directory>${basedir}/target/generated-sources</directory>
</fileset>
</configuration>
</execution>
</executions>
</plugin>
<!-- generate jaxws -->
<plugin>
<groupId>org.jboss.ws.plugins</groupId>
<artifactId>maven-jaxws-tools-plugin</artifactId>
<version>1.1.2.Final</version>
<executions>
<execution>
<phase>generate-sources</phase>
<goals>
<goal>wsconsume</goal>
</goals>
<configuration>
<wsdls>
<wsdl>${basedir}/resources/lists.wsdl</wsdl>
</wsdls>
<targetPackage>es.ssib.otic.facturas.sharepoint_ws</targetPackage>
<outputDirectory>${basedir}/target/generated-sources</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
<!-- copy sources -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>2.7</version>
<dependencies>
<dependency>
<groupId>org.apache.maven.shared</groupId>
<artifactId>maven-filtering</artifactId>
<version>1.3</version>
</dependency>
</dependencies>
<executions>
<execution>
<phase>generate-sources</phase>
<goals>
<goal>copy-resources</goal>
</goals>
<configuration>
<outputDirectory>${basedir}/src/main/java</outputDirectory>
<resources>
<resource>
<directory>${basedir}/target/generated-sources/wsconsume</directory>
<filtering>true</filtering>
</resource>
</resources>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
In order to try to exclude target/generated-sources I have addded this:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<executions>
<execution>
<id>default-compile</id>
<phase>compile</phase>
<configuration>
<excludes>
<exclude>**/target/generated-sources/*.java</exclude>
</excludes>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
As stated above, I do comment the "copy" plugin, the module depending on sharepoint_ws does not have any ot its classes available; I do use it I get errors in the tune of
[ERROR] /C:/Users/s004256/workspace/facturas_root/sharepoint_ws/src/main/java/es/ssib/otic/facturas/sharepoint_ws/DeleteList.java:[34,8] duplicate class: es.ssib.otic.facturas.sharepoint_ws.DeleteList
for each generated list.

Answer 1

In the first place, I recommend you'd better declare target/generated-sources as a source folder, instead of copying files here and there:
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>1.7</version>
<executions>
<execution>
<id>add-source</id>
<phase>initialize</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>${project.build.directory}/generated-sources</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
This should be enough to make Maven compile the target/generated-sources/*.java and package them all in the library, and also for Eclipse to recognize target/generated-sources as a source directory (after you execute Maven/Update Project).
By the way: You should take care of binding the plugins to a phase in the correct order: If you bound all tasks to "generate-sources", you have no gurantee about in which order will they be executed. And the same goes for the "compile" phase: You have to set properly the source folders, with its inclusions and exclusions, before the compile phase.
Take a look a the Default Maven Lifecycle and try to chose different, sequential phases for your tasks.