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README.md

Linkage Checker Enforcer Rule

This Maven enforcer rule verifies that the transitive dependency tree of pom.xml does not have any linkage errors.

Class path and dependencySection element

The dependencySection element determines whether the rule checks the dependencies in the dependencies section or the dependencyManagement section. The following values are accepted:

  • DEPENDENCIES (default value): the rule checks the class path calculated from the project's dependencies section.
  • DEPENDENCY_MANAGEMENT: the rule checks the class path calculated from the project's dependencyManagement section.

Usage

Add the following plugin configuration to your pom.xml:

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-enforcer-plugin</artifactId>
        <version>3.0.0-M2</version>
        <dependencies>
          <dependency>
            <groupId>com.google.cloud.tools.opensource</groupId>
            <artifactId>linkage-checker-enforcer-rules</artifactId>
            <version>0.1-SNAPSHOT</version>
          </dependency>
        </dependencies>
        <executions>
          <execution>
            <id>enforce</id>
            <goals>
              <goal>enforce</goal>
            </goals>
            <configuration>
              <rules>
                <banLinkageErrors
                    implementation="com.google.cloud.tools.opensource.enforcer.LinkageCheckerRule"/>
              </rules>
            </configuration>
          </execution>
        </executions>
      </plugin>
   ...

For a BOM project, set dependencySection element to DEPENDENCY_MANAGEMENT.

  <banLinkageErrors
      implementation="com.google.cloud.tools.opensource.enforcer.LinkageCheckerRule">
      <dependencySection>DEPENDENCY_MANAGEMENT</dependencySection>
  </banLinkageErrors>

To suppress linkage errors that are not reachable in the class reference graph from the classes in the direct dependencies of the project, set reportOnlyReachable element to true. (default: false).

  <banLinkageErrors
      implementation="com.google.cloud.tools.opensource.enforcer.LinkageCheckerRule">
      <reportOnlyReachable>true</reportOnlyReachable>
  </banLinkageErrors>

If a violation should not fail the build, set level element to WARN:

  <banLinkageErrors
      implementation="com.google.cloud.tools.opensource.enforcer.LinkageCheckerRule">
      <level>WARN</level>
  </banLinkageErrors>

Run

Enforcer rules are part of the validate lifecycle in Maven.

$ mvn validate

Debug

For developers of this enforcer rule, set the MAVEN_OPTS environment variable to wait for debuggers (suspend=y).

$ export MAVEN_OPTS='-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005'
$ mvn validate
Listening for transport dt_socket at address: 5005

Then run remote debug to the port (5005) via your IDE.