Excluding “provided” dependencies from Maven assem

问题:

I am trying to use the Maven assembly plugin to build a jar-with-dependencies, except those that have provided scope.

I have copied the jar-with-dependencies into an assembly.xml file and configured its use in my pom. Here it is for reference:

<?xml version="1.0" encoding="UTF-8"?>
<assembly>
  <id>injectable-jar</id>
  <formats>
    <format>jar</format>
  </formats>
  <includeBaseDirectory>false</includeBaseDirectory>
  <dependencySets>
    <dependencySet>
      <unpack>true</unpack>
      <scope>runtime</scope>
    </dependencySet>
  </dependencySets>
  <fileSets>
    <fileSet>
      <directory>${project.build.outputDirectory}</directory>
    </fileSet>
  </fileSets>
</assembly>

I have found out, that if I set the scope to provided, then I can build a jar that contains exactly what I don't want, but I cannot figure out how to get inverse behavior of that.

回答1:

This is a bit clunky, but you can use the maven-dependency-plugin to copy/unpack all the dependencies into your project, then use the assembly plugin to do the packaging.

The copy-dependencies and unpack-dependencies goals both have an optional excludeScope property you can set to omit the provided dependencies. The configuration below copies all dependencies into target/lib, your assembly plugin descriptor can be modified to use a fileSet to include those jars.

Update: Just tested this to confirm it works. Added the configuration for binding the assembly plugin to the package phase, and the relevant modifications to the assembly descriptor.

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-dependency-plugin</artifactId>
  <executions>
    <execution>
      <id>copy-dependencies</id>
      <phase>process-resources</phase>
      <goals>
        <goal>copy-dependencies</goal>
      </goals>
      <configuration>
        <excludeScope>provided</excludeScope>
        <outputDirectory>${project.build.directory}/lib</outputDirectory>
      </configuration>
    </execution>
  </executions>
</plugin>
<plugin>
  <artifactId>maven-assembly-plugin</artifactId>
  <version>2.2-beta-4</version>
  <executions>
    <execution>
      <id>jar-with-deps</id>
      <phase>package</phase>
      <goals>
        <goal>single</goal>
      </goals>
    </execution>
  </executions>
  <configuration>
    <descriptors>
      <descriptor>src/main/assembly/my-assembly.xml</descriptor>
    </descriptors>
  </configuration>
</plugin>

The fileSet section of the my-assembly descriptor would look like this:

<assembly>
  <fileSets>
    <fileSet>
      <directory>${project.build.directory}/lib</directory>
      <outputDirectory>/</outputDirectory>
      <includes>
        <include>*.*</include>
      </includes>
    </fileSet>
  </fileSets>
...

</assembly>

回答2:

In theory the tags "ignoreNonCompile" and "excludeScope" should help, but be warned that they do not necessarily work properly.

With maven3 and the maven-dependency-plugin 2.4, one solution is:

<configuration>
<excludeArtifactIds>junit,mockito-all</excludeArtifactIds>
<excludeTransitive>true</excludeTransitive>
</configuration>

回答3:

With the latest Maven (I was testing on Maven 3.0) this appears to work as expected, with some caveats:

The requested scope (in the dependencySet) may include additional scopes based on the following definition: http://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html#Dependency_Scope

Thus, if you request compile scope you will get both compile and provided. However, if you request runtime scope you should get compile and runtime (but not provided).

回答4:

This is an old post, but the maven-dependency-plugin now has an "excludeScope" option that you can set to "provided" or whatever scope you need.

http://maven.apache.org/plugins/maven-dependency-plugin/copy-dependencies-mojo.html#excludeScope

For example,

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-dependency-plugin</artifactId>
    <version>2.10</version>
    <executions>
        <execution>
            <id>copy-dependencies</id>
            <phase>prepare-package</phase>
            <goals>
                <goal>copy-dependencies</goal>
            </goals>
            <configuration>
                <outputDirectory>${project.build.directory}/lib</outputDirectory>
                <overWriteReleases>false</overWriteReleases>
                <overWriteSnapshots>false</overWriteSnapshots>
                <overWriteIfNewer>true</overWriteIfNewer>
                <excludeScope>provided</excludeScope>
            </configuration>
        </execution>
    </executions>
</plugin>