I have a maven project that uses the aspectj-compiler-plugin. I use intertype declarations so there are references to Aspect code in my Java code. Because of this, the maven-compiler-plugin fails to compile since it does not compile the aspect code.
My question is: how do I disable the maven-compiler-plugin from running because it is not doing anything useful?
There are several ways that I can get this project compiling, but they are sub-optimal:
Add exclusion filters to the maven-compiler-plugin. The plugin will still run, but it will not try to compile anything. Problem is that this breaks the ajdt project configurator in Eclipse
Move all java code to the aspectj folders. This doesn't feel right either.
You can disable the a plugin by set the phase of the plugin to none.
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<executions>
<execution>
<id>default-compile</id>
<phase>none</phase>
</execution>
</executions>
</plugin>
</plugins>
</build>
In Maven 3, the following will do this, for example disabling the clean plugin:
<build>
<plugins>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>2.4.1</version>
<executions>
<execution>
<id>default-clean</id>
<phase>none</phase>
</execution>
</executions>
</plugin>
</plugins>
</build>
The same technique can be used for any other plugin defined in the super-POM, the packaging type, or the parent POM. The key point is that you must copy the <id> shown by help:effective-pom, and change the <phase> to an invalid value (e.g. "none"). If you don't have the <id> (as e.g. in Jintian DENG's original answer – it has since been edited to add one), it will not work, as you have discovered.
Either configure the skipMain parameter:
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<skipMain>true</skipMain>
</configuration>
</plugin>
</plugins>
</build>
Or pass the maven.main.skip property:
mvn install -Dmaven.main.skip=true
The reason maven-compiler-plugin executes in the first place is because you trigger one of the default lifecycle bindings. For example if you're packaging jar using mvn package, it will trigger compile:compile at compile phase.
Maybe try not to use the default lifecycle, but use mvn aspectj:compile instead.
http://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html has more information about maven default lifecycle bindings
Related
Just started with Maven for real; got a big surprise right away.
I understand (or I think I do) the concept of fat jar/uberjars. Package your code with all the dependencies, etc. maven-shade-plugin, found docs, some example, checked that it works. Now adding it to my POC project, which came from the maven-archetype-quickstart - what could possibly go wrong, eh?
To put it short, quickstart arrange the the following way:
<build>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<plugin>
...
So I just threw in a plugin for shading, ready to call it a day:
<!-- Maven Shade Plugin -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.3</version>
<executions>
<!-- Run shade goal on package phase -->
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
Not so fast. First, I noticed that mvn clean package didn't mention maven-shade-plugin being executed (like the working example did). Hours of searching followed, and I was staring the "root cause" in the face - <pluginManagement>, offered by quickstart archetype, was it - somehow. Removing that tag magically allowed maven.shade.plugin to do its job. Otherwise, nope.
(Replica: https://github.com/alexakarpov/shade-me
unshade is the bad branch, master is good).
Talk about violation of the Principle of Least Surprise, eh =)
Can someone explain what's going on? The comment in generated pom mentioned something about parent pom, but I'm not doing anything with multi-pom setup yet..
<pluginManagement> role is described in Maven documentation :
Plugin Management contains plugin elements in much the same way [than plugins], except that rather than configuring plugin information for this particular project build, it is intended to configure project builds that inherit from this one.
Its goal here in the project generated by the archetype is to set specified versions of default plugins (maven-clean-plugin, maven-jar-plugin, ...). Note that these default plugins do not appear in your POM <plugins> section, but they are declared implicitly (you can check it by running mvn help:effective-pom).
But adding a plugin to <pluginManagement> section does not make your project invoke that plugin. Here, you can just set configuration and the version of the plugin you want to use. To invoke the plugin, you should absolutely declare it in <plugins> section.
In some projects (most of time multi-module projects), you could see the plugin and its configuration declared in <pluginManagement> of parent POM, and then referenced on <plugins> section of modules needing invocation of that plugin : thus, you do not have to repeat the same configuration on each module.
<pluginManagement> is mostly used if you want to use POM inheritance. Otherwise, on simple projects, you can just declare them in <plugins> section. I've also seen some projects defining all configuration in <pluginManagement>, just to make <plugins> section shorter and more readable, like the following example. It's just a matter of taste.
<build>
<!-- pluginManagement section : set versions and configurations -->
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.3</version>
<executions>
<!-- Run shade goal on package phase -->
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</pluginManagement>
<!-- plugins section : plugins that are invoked when building the project -->
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
</plugin>
</plugins>
</build>
You can also read more on StackOverflow : Maven : What is pluginManagement?
Easy question here. I want to add sonar to be executed on every Maven build. I tried:
<plugin>
<groupId>org.sonarsource.scanner.maven</groupId>
<artifactId>sonar-maven-plugin</artifactId>
<version>3.1.1</version>
</plugin>
and
<plugin>
<groupId>org.codehaus.sonar</groupId>
<artifactId>sonar-maven-plugin</artifactId>
<version>5.1</version>
</plugin>
and
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>sonar-maven-plugin</artifactId>
<version>2.7.1</version>
</plugin>
because a) I couldn't figure out what the plug-ins do and/or b) which one is the current one.
If I only add the above to <build> -> <plugins> it's not executed ever (so the plug-in doesn't have a default execution). So of course I added a <execution> instruction, and after that Sonar gets executed, but with the following error message:
<executions>
<execution>
<phase>prepare-package</phase>
<goals>
<goal>sonar</goal>
</goals>
</execution>
</executions>
Failed to execute goal org.sonarsource.scanner.maven:sonar-maven-plugin:3.1.1:sonar (default) on project org.acme.project.build: Can not execute Findbugs: This project contains Java source files that are not compiled.
It does not seem to matter which phase I use (I tried validate and compile and test and prepare-package and package even though not all of them make sense). I am sure there is no source code generation anywhere in the project. And the static classes get compiled just fine.
I think the problem might be that the plug-in gets executed for every module, including the parent pom project. Which is weird, because sonar:sonar skips that project.
But the project structure is simple and I can't find anything unusual about it:
<groupId>group</groupId>
<artifactId>org.acme.project.build</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>pom</packaging>
<modules>
<module>org.acme.project</module>
</modules>
<profiles>
<profile>
<id>sonar</id>
<properties>
<sonar.host.url>http://sonar.acme.org/</sonar.host.url>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.sonarsource.scanner.maven</groupId>
<artifactId>sonar-maven-plugin</artifactId>
<version>3.1.1</version>
<executions>
<execution>
<phase>compile</phase>
<goals>
<goal>sonar</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
</profiles>
The project org.acme.project has nothing besides its own artifact ID and the parent. The command line is: mvn clean deploy -Dsonar.login=Wile.Coyote -Dsonar.password=*********** -Psonar
The log shows that sonar is always executed before the install phase, which of course is way to early.
So how do I use Sonar's Maven plug-in to analyze my code?
a) I couldn't figure out what the plug-ins do
The plugin is used to gather the details from code coverage reports and the repository code scanning for getting to analyze possible bugs, duplications etc. You can search for a sample sonar report to find what all and how to get these details with maven using two methods like settings.xml and maven plugin is detailed at SonarQube Scanner for Maven and
SonarQube - analyzing with Maven
b) which one is the current one.
The maven central suggests that the current plugin from org.codehaus.mojo used as
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>sonar-maven-plugin</artifactId>
<version>3.2</version>
</plugin>
has been moved to
<plugin>
<groupId>org.sonarsource.scanner.maven</groupId>
<artifactId>sonar-maven-plugin</artifactId>
<version>3.2</version>
</plugin>
So you should ideally be using the one from groupId - org.sonarsource.scanner.maven as also suggested by the SonarQube Docs
Also the artifact from org.codehaus.sonar version 5.1 seems to be outdated and not maintained.
I build our multi-project application with Maven(lots of pom.xml-s). We recently introduced AspectJ, however I suspect AspectJ contributes to performance problems. In order to be sure, I'd like to build the application this time without AspectJ and see how it performs. But I would not really like to remove all AspectJ related stuff from pom.xml, so it would be handy if there was some kind of flag or something that could exclude AspectJ from build. Is there any?
Update: this does not seem to have any effect: -Dmaven.aspectj.skip=true
If you want to disable the aspectj-maven-plugin temporarily, you could add a profile to the parent pom.xml which deregisters the executions of the plugin (by assigning them to phase none). Could look like this (add your own execution IDs if you have some):
<profile>
<id>noAspectJ</id>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>aspectj-maven-plugin</artifactId>
<executions>
<execution>
<id>compile</id>
<phase>none</phase>
</execution>
<execution>
<id>test-compile</id>
<phase>none</phase>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
A simple maven cmd activates this:
mvn clean install -PnoAspectJ
I include the following snippet in a projects object model
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<version>2.1.2</version>
</plugin>
according to maven.apache.org the plugin attaches the jar goal to the package phase.
However doing "mvn clean ; mvn package" does not generate a project-sources.jar in the target directory.
EDIT: Propably i do not understand the comment from the website, which i quoted: "[The source:jar goal] Binds by default to the lifecycle phase: package." I expected that, when i include the plugin section as shown above maven already binds the source:jar goal to the package phase. Am i mistaking here? What does the comment mean?
matthias.
The documentation is a little misleading. The plugin has a default execution phase of package but there is no default goal. I believe that you have specify a goal in order for the plugin to work.
You need to bind the plugin to a maven life-cycle goal for it to generate the source jar. Otherwise, you need to invoke it explicitly mvn source:jar.
As documented here, you can bind it to the jar goal.
Try this:
<project>
...
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<version>2.1.2</version>
<executions>
<execution>
<id>attach-sources</id>
<goals>
<goal>jar-no-fork</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
...
</project>
It uses then the default binding of jar-no-fork goal to package phase of the lifecycle and that's probably what you need here.
I'm playing around with writing a maven plugin for the first time. I've written a simple plugin with a goal that writes a hello world message to the output. I've also used the #phase annotation to create a default binding to the install lifecycle phase. This shows up in my plugin.xml as install element of my mojo element.
My understanding is that I can now simply add this to my build.plugins section, without specifying any execution, and my plugin goal will execute during the install phase. This doesn't happen though. Here's the configuration that doesn't create any exeuction of my goal:
<build>
<plugins>
<plugin>
<groupId>com.emc.chad</groupId>
<artifactId>hello-plugin</artifactId>
<version>0.0.1-SNAPSHOT</version>
</plugin>
</plugins>
</build>
However, if I change this to specify an execution explicitly, it works:
<plugin>
<groupId>com.emc.chad</groupId>
<artifactId>hello-plugin</artifactId>
<version>0.0.1-SNAPSHOT</version>
<executions>
<execution>
<id>test</id>
<phase>install</phase>
<goals>
<goal>hello</goal>
</goals>
<configuration>
</configuration>
</execution>
</executions>
</plugin>
I understand why this works of course, but shouldn't the first work as well, considering my plugin.xml phase specification?