How is JSPC called? - java

Given:
Upon running mvn clean install JSP compiler jspc reports issues
Issues are confirmed real. When deploying code as is (without fixing anything) JSP is broken at runtime
Upon fixing the issues and deploying the application, issues go away
Problem: Fix is not recognized by JSPC
How is JSPC called?
<plugin>
<groupId>org.codehaus.mojo.jspc</groupId>
<artifactId>jspc-maven-plugin</artifactId>
<configuration>
<includeInProject>false</includeInProject>
<sources>
<directory>${basedir}/myapp/src/main/webapp/</directory>
<includes>
<include>**/*.jsp</include>
</includes>
</sources>
<source>1.6</source>
<target>1.6</target>
</configuration>
<executions>
<execution>
<goals>
<goal>compile</goal>
</goals>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.codehaus.mojo.jspc</groupId>
<artifactId>jspc-compiler-tomcat6</artifactId>
<version>2.0-alpha-3</version>
</dependency>
</dependencies>
</plugin>
What errors are reported?
[ERROR] MyClass cannot be resolved to a type
More details about the problem:
Similar question about this here
It seems like a classpath problem, but where in pom can it be set please?

Try adding
<workingDirectory>${basedir}/myapp/target/classes</workingDirectory>
inside <configuration> tags

Related

Maven - URI is non hierarchial

Im trying learn Spring and Maven but im having some trouble.
When I go to run my tests from the terminal using mvn clean install I'm getting this error: java.lang.IllegalArgumentException: URI is not hierarchical . This is the block of code that throws the error :
LocationWeatherRootResponseTest.class.getClassLoader().getResource("extent.xml")).toURI()
When I change the above code to the following Im getting a null pointer exception.
LocationWeatherRootResponseTest.class.getClassLoader().getResourceAsStream("extent.xml")))
Update
When I change the code to the below Im getting a new error.
File file = new File(WeatherTest.class.getClassLoader().getResource("extent.xml").getPath());
Reporter.loadXMLConfig(file);
stacktrace :
java.io.FileNotFoundException: file:/home/user/IdeaProjects/spring-cucumber-test-harness/common/target/common-1.0-SNAPSHOT.jar!/extent.xml (No such file or directory)
I managed to solve this issue using maven-remote-resources-plugin . Now when I run mvn clean install on the master POM the framework runs from e2e.
In the module containing the resources I wanted to share, I added the following to the POM file
<build>
<plugins>
<plugin>
<artifactId>maven-remote-resources-plugin</artifactId>
<version>1.7.0</version>
<executions>
<execution>
<goals>
<goal>bundle</goal>
</goals>
</execution>
</executions>
<configuration>
<includes>
<include>**/*.xml</include>
</includes>
</configuration>
</plugin>
</plugins>
</build>
In the module where I want to use the resource. I added the following
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-remote-resources-plugin</artifactId>
<version>1.7.0</version>
<configuration>
<resourceBundles>
<resourceBundle>{groupId}:{resource artifactId}:1.0-SNAPSHOT</resourceBundle>
</resourceBundles>
</configuration>
<executions>
<execution>
<goals>
<goal>process</goal>
</goals>
</execution>
</executions>
</plugin>

Unable to get Jacoco to work with Powermockito using offline instrumentation

Given that Jacoco doesn't play nicely with PowerMockito when instrumenting "on the fly", I've been trying to configure offline instrumentation in the hope this will give me proper unit test coverage for classes that use PowerMockito.
I've setup my pom as below but I still get zero % coverage on my test class. Any help much appreciated as it's driving me slowly bonkers!
<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>mandy</groupId>
<artifactId>jacoco-test</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>jacoco-test Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<powermock.version>1.5.4</powermock.version>
<jacoco.version>0.7.1.201405082137</jacoco.version>
</properties>
<dependencies>
<dependency>
<groupId>org.jacoco</groupId>
<artifactId>org.jacoco.agent</artifactId>
<classifier>runtime</classifier>
<version>${jacoco.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-module-junit4</artifactId>
<version>${powermock.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-api-mockito</artifactId>
<version>${powermock.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>${jacoco.version}</version>
<executions>
<execution>
<id>instrument</id>
<phase>process-classes</phase>
<goals>
<goal>instrument</goal>
</goals>
</execution>
<execution>
<id>restore-report</id>
<phase>prepare-package</phase>
<goals>
<goal>restore-instrumented-classes</goal>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.17</version>
<configuration>
<!--<argLine>${argLine}</argLine>-->
<systemPropertyVariables>
<!-- JaCoCo runtime must know where to dump coverage: -->
<jacoco-agent.destfile>target/jacoco.exec</jacoco-agent.destfile>
</systemPropertyVariables>
</configuration>
</plugin>
</plugins>
<finalName>jacoco-test</finalName>
</build>
</project>
here is my class under test:
public class Utils {
private Utils() {
}
public static String say(String s) {
return "hello:"+s;
}
}
here is my test:
#RunWith(PowerMockRunner.class)
#PrepareOnlyThisForTest(Utils.class)
#PowerMockIgnore("org.jacoco.agent.rt.*")
public class UtilsTest {
#Test
public void testSay() throws Exception {
PowerMockito.mockStatic(Utils.class);
Mockito.when(Utils.say(Mockito.anyString())).thenReturn("hello:mandy");
assertEquals("hello:mandy", Utils.say("sid"));
}
}
I run mvn clean install which generates the jacoco.exe
Coverage report (generated from jacoco.exec using an ant script ):-
This pom worked for me:
<build>
<finalName>final-name</finalName>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.18.1</version>
<configuration>
<systemPropertyVariables>
<jacoco-agent.destfile>target/jacoco.exec</jacoco-agent.destfile>
</systemPropertyVariables>
</configuration>
</plugin>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.7.2.201409121644</version>
<executions>
<execution>
<id>default-instrument</id>
<goals>
<goal>instrument</goal>
</goals>
</execution>
<execution>
<id>default-restore-instrumented-classes</id>
<goals>
<goal>restore-instrumented-classes</goal>
</goals>
</execution>
<execution>
<id>default-report</id>
<phase>prepare-package</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
See this link.
I saw the same behavior, though after following the thread on the GitHub issue it seems to be fixed in 1.6.5, which proved true for me.
Hopefully this will save someone a headache later :).
Working configuration with:
jacoco-maven-plugin 0.7.7.201606060606
powermock 1.6.5
I am not using offline instrumentation.
For me this sample of Offline Instrumentation works well.
But it turns in my case that there is a simplier solution: just do not include the tested class in #PrepareForTest({}) annotation before its declaration.
I used Jacoco offline instrumentation and after execution of test restore ed original classes with help of "restore-instrumented-classes" goal. My JaCoCo configuration look like this:
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.7.9</version>
<executions>
<execution>
<id>default-prepare-agent</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>jacoco-instrument</id>
<goals>
<goal>instrument</goal>
</goals>
</execution>
<execution>
<id>jacoco-restore-instrumented-classes</id>
<goals>
<goal>restore-instrumented-classes</goal>
</goals>
</execution>
<execution>
<id>jacoco-report</id>
<phase>package</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
<configuration>
<excludes>
<exclude>*</exclude>
</excludes>
</configuration>
</plugin>
I made it work using the javaagent of PowerMock.
see here: https://github.com/powermock/powermock/wiki/PowerMockAgent
Remove the #RunWith annotations, put the PowerMockRule as described in the link above. Make it public.
Put the following line in the maven-surefire-plugin configuration:
-javaagent:${org.powermock:powermock-module-javaagent:jar}
(used the technique described here : Can I use the path to a Maven dependency as a property?)
<?xml version="1.0" encoding="UTF-8"?>
<project>
<modelVersion>4.0.0</modelVersion>
<groupId>com.stackoverflow</groupId>
<artifactId>q2359872</artifactId>
<version>2.0-SNAPSHOT</version>
<name>q2359872</name>
<properties>
<!-- Must be listed in the dependencies section otherwise it will be null. -->
<my.lib>${org.jmockit:jmockit:jar}</my.lib>
</properties>
<dependencies>
<dependency>
<groupId>org.jmockit</groupId>
<artifactId>jmockit</artifactId>
<version>1.11</version>
</dependency>
</dependencies>
<build>
<defaultGoal>generate-sources</defaultGoal>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.3</version>
<executions>
<execution>
<goals>
<goal>properties</goal>
</goals>
</execution>
</executions>
</plugin>
<!-- Example usage: -->
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2</version>
<executions>
<execution>
<goals>
<goal>exec</goal>
</goals>
<phase>generate-sources</phase>
</execution>
</executions>
<configuration>
<executable>echo</executable>
<arguments>
<argument>path to jar=</argument>
<argument>${org.jmockit:jmockit:jar}</argument>
<argument>my.lib=</argument>
<argument>${my.lib}</argument>
</arguments>
</configuration>
</plugin>
<!-- end of Example usage -->
</plugins>
</build>
</project>
I ended up using offline instrumentation and Jacoco (similar to what you have done) in conjunction with sonar and I was able to get the coverage numbers from that.
I was also facing the same issue. I was able to generate report partially. I have used both these tags for my test cases #RunWith(PowerMockRunner.class)
#PrepareForTest({}). And the report was not getting generated for the test cases where i used the above mentioned tags. But for one of the test case there was only this tag #RunWith(PowerMockRunner.class). Somehow the report was getting generated for that case. And also i have never used offline instrumentation. When i tried using the offline instrumentation i was getting error saying that the class was already instrumented. I tried various scenarios and followed various links but could not generate the report. Finally as per the above comment i upgraded my version of powermock from 1.5.5 to 1.6.5 and i was able to generate the report. Following is my pom.xml entry
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.7.5.201505241946</version>
<executions>
<execution>
<id>pre-unit-test</id>
<goals>
<goal>prepare-agent</goal>
</goals>
<configuration>
<!-- Sets the path to the file which contains the execution data. -->
<destFile>${basedir}/target/jacoco.exec</destFile>
<!--
Sets the name of the property containing the settings
for JaCoCo runtime agent.
-->
</configuration>
</execution>
<execution>
<!--<id>post-unit-test</id>
<phase>test</phase>-->
<id>default-report</id>
<phase>verify</phase>
<goals>
<goal>report</goal>
</goals>
<configuration>
<!-- Sets the path to the file which contains the execution data. -->
<dataFile>${basedir}/target/jacoco.exec</dataFile>
<!-- Sets the output directory for the code coverage report. -->
<outputDirectory>${basedir}/target/jacoco-ut</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
Following is my entry in pom .xml for maven-surefire-plugin
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<argLine>#{argLine}</argLine>
<skipTests>false</skipTests>
<testFailureIgnore>true</testFailureIgnore>
</configuration>
</plugin>
#{argLine} was set as a property
<properties>
<argLine>-noverify -Xms512m -Xmx1024m -XX:PermSize=128m -XX:MaxPermSize=512m</argLine>
</properties>
And upgraded my powermock version from 1.5.5 to 1.6.5 . Finally i could see my report generation for the classes where i used the following tags in my test cases
#RunWith(PowerMockRunner.class) #PrepareForTest({})
Use below maven plugin code snippet this works fine in jenkins as well as in local and shows full code coverage for PowermockRunner unit tests
<build>
<plugins>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>${jacoco-maven-plugin.version}</version>
<executions>
<execution>
<id>pre-test</id>
<goals>
<goal>prepare-agent</goal>
</goals>
<configuration>
<append>true</append>
</configuration>
</execution>
<execution>
<id>pre-integ-test</id>
<goals>
<goal>prepare-agent-integration</goal>
</goals>
<configuration>
<append>true</append>
</configuration>
</execution>
<execution>
<id>jacoco-instrument</id>
<goals>
<goal>instrument</goal>
</goals>
</execution>
<execution>
<id>jacoco-restore-instrumented-classes</id>
<goals>
<goal>restore-instrumented-classes</goal>
</goals>
</execution>
</executions>
<configuration>
<excludes>
<exclude>*</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
Code Coverage with JaCoCo explained the reason
The simplest way to use JaCoCo it is — on-the-fly instrumentation with using JaCoCo Java Agent. In this case a class in modified when it is being loaded. You can just run you application with JaCoCo agent and a code coverage is calculated. This way is used by Eclemma and Intellij Idea. But there is a big issue. PowerMock instruments classes also. Javassist is used to modify classes. The main issue is that Javassist reads classes from disk and all JaCoCo changes are disappeared. As result zero code coverage for classes witch are loaded by PowerMock class loader.
We are going to replace Javassist with ByteBuddy (#727) and it should help to resolve this old issue. But right now there is NO WAY TO USE PowerMock with JaCoCo On-the-fly instrumentation. And no workaround to get code coverage in IDE.
JaCoCo Offline Instrumentation can solve this problem.
The sample of Offline Instrumentation fixed my problem .
I have tried these versions of the below softwares; they work together and generate the jacoco report without any extra effort. I use the gradle build tool with powermock, mockito and wiremock.
powermock-api-mockito2:2.0.2
powermock-module-junit4:2.0.2
gradle 5.6.2
The above correctly generates the jacoco coverage report.
I had same issue with JaCoCo On-the-fly and PowerMock. 0% code coverage was generated every time
Found out that JaCoCo version 0.7.7.201606060606 and PowerMock version 1.6.2 are compatible and code coverage is generated successfully.
The report is correct. The provided test leads to no coverage as you mock what happens when calling the method "say". One should never mock the "instance/class under test", only do this for the dependencies and surroundings of the test subject.
In this case: The code return "hello:"+s; is never reached by the test and the constructor of Utils is not called. There is no coverage displayed as there is no test coverage of these lines at all.
Nevertheless using JaCoCo and PowerMock together is not trivial. I am currently looking for how to get it to run, too. Maybe your provided test is just unluckily written and JaCoCo is already working as it should?

Could not find dependencies for aspectj-maven-plugin

I have a problem with CTW aspects using aspectj-maven-plugin. I get the following error (execution entry is being highlighted):
Multiple annotations found at this line:
- Execution default of goal org.codehaus.mojo:aspectj-maven-plugin:1.5:compile failed: Plugin
org.codehaus.mojo:aspectj-maven-plugin:1.5 or one of its dependencies could not be resolved: Could not find artifact
com.sun:tools:jar:1.7.0_21 at specified path C:\Program Files\Java\jre7/../lib/tools.jar (org.codehaus.mojo:aspectj-maven-
plugin:1.5:compile:default:compile)
- Execution default of goal org.codehaus.mojo:aspectj-maven-plugin:1.5:test-compile failed: Plugin
org.codehaus.mojo:aspectj-maven-plugin:1.5 or one of its dependencies could not be resolved: Could not find artifact
com.sun:tools:jar:1.7.0_21 at specified path C:\Program Files\Java\jre7/../lib/tools.jar (org.codehaus.mojo:aspectj-maven-
plugin:1.5:test-compile:default:test-compile)
On the configuration:
<build>
<plugins>
<!-- http://mojo.codehaus.org/aspectj-maven-plugin/usage.html -->
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>aspectj-maven-plugin</artifactId>
<version>1.5</version>
<configuration>
<showWeaveInfo>true</showWeaveInfo>
<outxml>true</outxml>
<source>1.7</source>
<target>1.7</target>
<sources>
<source>
<basedir>src/main/java</basedir>
<includes>
<include>**/*Aspect.java</include>
</includes>
</source>
</sources>
</configuration>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>test-compile</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
What am I doing wrong? It looks like as if this plugin was unable to find jdk? But why?
Is your JAVA_HOME set properly? Please check that. It worked perfectly for me. So I think you should add below mentioned plugin and try:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
Run mvn compile after that.
Please check the JAVA_HOME env variable. This happened to me when JAVA_HOME is pointed to JRE folder rather than jdk folder.
I had this problem running with java 11, seems like it is only compatible with java 8.
Looking into the project, aspectj-maven-plugin it looks like the update was committed but never actually merged.

Weblogic 11g Maven deploy Issue

I am trying to deploy a war file on Weblogic 11g server using Maven (weblogic-maven-plugin) v 10.3.4
But I am getting below error on running mvn wls:deploy
Cannot find MW_HOME at location.....C:\work_maven\springmvc\Oracle\Software. You must define the middlewareHome parameter for the Maven goal.
I have installed weblogic at C:\bea11g
I also have MW_HOME set to above weblogic path.
My project's pom.xml build looks like this:
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.0.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
<plugin>
<groupId>com.oracle.weblogic</groupId>
<artifactId>weblogic-maven-plugin</artifactId>
<version>10.3.4</version>
<configuration>
<middlewareHome>C:\bea11g</middlewareHome>
<adminurl>t3://localhost:7001</adminurl>
<user>weblogic</user>
<password>weblogic1</password>
<upload>true</upload>
<action>deploy</action>
<remote>false</remote>
<verbose>true</verbose>
<source>
${project.build.directory}/${project.build.finalName}.${project.packaging}
</source>
<name>${project.build.finalName}</name>
</configuration>
<executions>
<execution>
<phase>install</phase>
<goals>
<goal>deploy</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
Any help is greatly appreciated.
Thanks.
MW_HOME should be set to C:\bea11g, the directory where you installed WebLogic.
However, it looks like it is set to C:\work_maven\springmvc\Ora cle\Software.
Double check your environment variable setup and retry.
[Edit]
See here for reference:
http://docs.oracle.com/cd/E24329_01/web.1211/e24368/maven.htm
It looks like you need to set weblogicHome rather than middlewareHome in your plugin configuration.
It looks like something was wrong with the weblogic-maven-plugin installation and configuration.
I followed the link http://docs.oracle.com/cd/E21764_01/web.1111/e13702/maven_deployer.htm and now it is working fine.

How to use of the Maven Enforcer plugin?

I'd like to use the Maven Enforcer plugin to check to see if I have duplicate classes on my path.
I've tried the example from here.
But when I run it like this:
mvn enforcer:enforce
I get this error:
Failed to execute goal
org.apache.maven.plugins:maven-enforcer-plugin:1.0.1:enforce
(default-cli) on project datapopulator: The parameters 'rules' for
goal org.apache.maven.plugins:maven-enforcer-plugin:1.0.1:enforce are
missing or invalid
Is there a way to use this correctly?
EDIT #1
If changing my config to this:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-enforcer-plugin</artifactId>
<version>1.0.1</version>
<executions>
<execution>
<id>enforce-versions</id>
<goals>
<goal>enforce</goal>
</goals>
<configuration>
<rules>
<AlwaysPass />
</rules>
<fail>true</fail>
</configuration>
</execution>
</executions>
</plugin>
Produces the same error.
The reason why your first version did not work is because there is a difference between a plug-in configuration inside the execution tag and a plug-in configuration outside the execution tag. The execution is only used when your plug-in is triggered by a special phase of the complete Maven build.
The Maven guide to configuration explains it better:
Configurations inside the tag differ from those that are outside in that they cannot be used from a direct command line invocation. Instead they are only applied when the lifecycle phase they are bound to are invoked. Alternatively, if you move a configuration section outside of the executions section, it will apply globally to all invocations of the plugin.
Try this, moving the configuration outside executions, so it isn't bound to the life cycle phase.
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-enforcer-plugin</artifactId>
<version>1.0.1</version>
<executions>
<execution>
<id>enforce-versions</id>
<goals>
<goal>enforce</goal>
</goals>
</execution>
</executions>
<configuration>
<rules>
<AlwaysPass />
</rules>
<fail>true</fail>
</configuration>
</plugin>
Now when you do mvn enforcer:enforce, it picks the rules from your pom.xml.
See these answers
You can use the special default command line execution id, default-cli to invoke it (see Maven Docs), see my example below. This works at least with 3.1.1 and the article cited says it should work with 2.2.0+
mvn enforcer:enforce
However if you are using above Maven 3.1.1 (I can confirm it works in 3.3.3 with enforcer v 1.4.1) you can specify the execution id you wish using the new # syntax (see Maven JIRA and the answers above);
e.g. for the example below use
mvn enforcer:enforce#dependency-convergence
Here's a snippet from my pom;
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-enforcer-plugin</artifactId>
<version>1.4.1</version>
<executions>
<execution>
<id>dependency-convergence</id>
<phase>install</phase>
<goals>
<goal>enforce</goal>
</goals>
<configuration>
<rules>
<DependencyConvergence />
</rules>
<fail>true</fail>
</configuration>
</execution>
<execution>
<id>default-cli</id>
<goals>
<goal>enforce</goal>
</goals>
<configuration>
<rules>
<DependencyConvergence/>
</rules>
<fail>true</fail>
</configuration>
</execution>
</executions>
</plugin>
...
I don't know why it won't work with the config being in an execution, but this worked for me:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-enforcer-plugin</artifactId>
<version>1.0</version>
<configuration>
<rules>
<banDuplicateClasses>
<findAllDuplicates>true</findAllDuplicates>
</banDuplicateClasses>
</rules>
<fail>false</fail>
</configuration>
<dependencies>
<dependency>
<groupId>org.codehaus.mojo</groupId>
<artifactId>extra-enforcer-rules</artifactId>
<version>1.0-alpha-1</version>
</dependency>
</dependencies>
</plugin>

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