Shadows for parameter resource: cannot find the resource in the class org.apache.maven.plugins.shade.resource.ManifestResourceTransformer

Question

I am working on a maven project. I am trying to integrate jmh benchmarking in my project. Pom.xml of my maven project ...

<parent>
    <groupId>platform</groupId>
    <artifactId>platform-root</artifactId>
    <version>3.0-SNAPSHOT</version>
    <relativePath>../../pom.xml</relativePath>
</parent>

<artifactId>platform-migration</artifactId>
<packaging>jar</packaging>
<name>Platform Migration</name>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compile.source>1.7</maven.compile.source>
    <maven.compile.target>1.7</maven.compile.target>
    <jmh.version>1.1.1</jmh.version>
    <jersey-version>2.22.1</jersey-version>
    <uberjar.name>rest-benchmarks</uberjar.name>
</properties>


<dependencies>
    <dependency>
        <groupId>platform</groupId>
        <artifactId>platform-commons</artifactId>
        <version>${platform.version}</version>
    </dependency>

    <dependency>
        <groupId>platform</groupId>
        <artifactId>platform-persistence</artifactId>
        <version>${platform.version}</version>
    </dependency>

    <dependency>
        <groupId>platform</groupId>
        <artifactId>platform-testing</artifactId>
        <version>${project.version}</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.openjdk.jmh</groupId>
        <artifactId>jmh-core</artifactId>
        <version>${jmh.version}</version>
    </dependency>
    <dependency>
        <groupId>org.openjdk.jmh</groupId>
        <artifactId>jmh-generator-annprocess</artifactId>
        <version>${jmh.version}</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.core</groupId>
        <artifactId>jersey-client</artifactId>
        <version>${jersey-version}</version>
    </dependency>

</dependencies>


<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>3.0.0</version>
            <executions>
                <execution>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                    <configuration>
                        <transformers>
                            <transformer
                                implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                <mainClass>org.openjdk.jmh.Main</mainClass>
                            </transformer>
                        </transformers>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

When I create my project using "mvn clean install", I got the following error:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-shade-plugin:3.0.0:shade (default) on project platform-migration: Unable to parse configuration of mojo org.apache.maven.plugins:maven-shade-plugin:3.0.0:shade for parameter resource: Cannot find 'resource' in class org.apache.maven.plugins.shade.resource.ManifestResourceTransformer -> [Help 1]

I do not understand why this error occurs?

Answer 1

Your configuration does not look right:

<project>
  ...
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
        <version>3.0.0</version>
        <executions>
          <execution>
            <goals>
              <goal>shade</goal>
            </goals>
            <configuration>
              <transformers>
                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                  <manifestEntries>
                    <Main-Class>xxxxxxxxxxx</Main-Class>
                  </manifestEntries>
                </transformer>
              </transformers>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
  ...
</project>

Answer 2

ManifestResourceTransformer allows you to replace existing records in MANIFEST and add new records.

,

• Main-Class app.main.class,
• X-Compile-Source-JDK maven.compile.source
• X-Compile-Target-JDK maven.compile.target.

<project>
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
        <version>3.0.0</version>
        <executions>
          <execution>
            <goals>
              <goal>shade</goal>
            </goals>
            <configuration>
              <transformers>
                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                  <manifestEntries>
                    <Main-Class>${app.main.class}</Main-Class>
                    <X-Compile-Source-JDK>${maven.compile.source}</X-Compile-Source-JDK>
                    <X-Compile-Target-JDK>${maven.compile.target}</X-Compile-Target-JDK>
                  </manifestEntries>
                </transformer>
              </transformers>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>

,

Answer 3

, , , .

pom, maven-shade-plugin pom. , Maven , . , Maven transformer .

To understand this, use mvn help:effective-pomand find the resulting configuration maven-shade-plugin. In my case, it <resource>was added to ManifestResourceTransformer, and this resource corresponded to the first entry in the parent pom configuration maven-shade-plugin.

Adding <id>to <execution>fixes the problem:

<plugins>
  <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-shade-plugin</artifactId>
    <executions>
      <execution>
        <id>shade-my-jar</id>
...

I suspect that both configurations used the same default identifier. Thus, the key is that each execution of the plugin has a unique identifier.