Add strict option to EnforceBytecodeVersion to not ignore module-info and Multi-Release JAR classes

src/it/enforce-bytecode-version-module-info-jdk8-strict/invoker.properties

@@ -0,0 +1,2 @@
+invoker.goals = enforcer:enforce
+invoker.buildResult = failure

src/it/enforce-bytecode-version-module-info-jdk8-strict/pom.xml

@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<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/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>pim.pam.poum</groupId>
+  <artifactId>smoking</artifactId>
+  <version>1.0-SNAPSHOT</version>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.ow2.asm</groupId>
+      <artifactId>asm</artifactId>
+      <version>6.0</version>
+      <scope>runtime</scope>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <artifactId>maven-enforcer-plugin</artifactId>
+        <version>@enforcerPluginVersion@</version>
+        <dependencies>
+          <dependency>
+            <groupId>@project.groupId@</groupId>
+            <artifactId>@project.artifactId@</artifactId>
+            <version>@project.version@</version>
+          </dependency>
+        </dependencies>
+        <configuration>
+          <rules>
+            <enforceBytecodeVersion>
+              <maxJdkVersion>1.8</maxJdkVersion>
+              <strict>true</strict>
+            </enforceBytecodeVersion>
+          </rules>
+        </configuration>
+        <executions>
+          <execution>
+            <phase>compile</phase>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+</project>

src/it/enforce-bytecode-version-module-info-jdk8-strict/verify.groovy

@@ -0,0 +1,9 @@
+File file = new File( basedir, "build.log" );
+assert file.exists();
+
+String text = file.getText("utf-8");
+
+assert ! text.contains( '[INFO] Adding ignore: module-info' )
+assert text.contains( 'Found Banned Dependency: org.ow2.asm:asm:jar:6.0' )
+
+return true;

src/it/enforce-bytecode-version-module-info-jdk9-strict/invoker.properties

@@ -0,0 +1,2 @@
+invoker.goals = enforcer:enforce
+invoker.buildResult = success

src/it/enforce-bytecode-version-module-info-jdk9-strict/pom.xml

@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<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/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>pim.pam.poum</groupId>
+  <artifactId>smoking</artifactId>
+  <version>1.0-SNAPSHOT</version>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.ow2.asm</groupId>
+      <artifactId>asm</artifactId>
+      <version>6.0</version>
+      <scope>runtime</scope>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <artifactId>maven-enforcer-plugin</artifactId>
+        <version>@enforcerPluginVersion@</version>
+        <dependencies>
+          <dependency>
+            <groupId>@project.groupId@</groupId>
+            <artifactId>@project.artifactId@</artifactId>
+            <version>@project.version@</version>
+          </dependency>
+        </dependencies>
+        <configuration>
+          <rules>
+            <enforceBytecodeVersion>
+              <maxJdkVersion>1.9</maxJdkVersion>
+              <strict>true</strict>
+            </enforceBytecodeVersion>
+          </rules>
+        </configuration>
+        <executions>
+          <execution>
+            <phase>compile</phase>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+</project>

src/it/enforce-bytecode-version-module-info-jdk9-strict/verify.groovy

@@ -0,0 +1,9 @@
+File file = new File( basedir, "build.log" );
+assert file.exists();
+
+String text = file.getText("utf-8");
+
+assert ! text.contains( '[INFO] Adding ignore: module-info' )
+assert ! text.contains( 'Found Banned Dependency: org.ow2.asm:asm:jar:6.0' )
+
+return true;

src/it/enforce-bytecode-version-multirelease-strict/invoker.properties

@@ -0,0 +1,2 @@
+invoker.goals = enforcer:enforce
+invoker.buildResult = failure

src/it/enforce-bytecode-version-multirelease-strict/pom.xml

@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<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/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>pim.pam.poum</groupId>
+  <artifactId>smoking</artifactId>
+  <version>1.0-SNAPSHOT</version>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.apache.logging.log4j</groupId>
+      <artifactId>log4j-api</artifactId>
+      <version>2.17.2</version>
+      <scope>runtime</scope>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <artifactId>maven-enforcer-plugin</artifactId>
+        <version>@enforcerPluginVersion@</version>
+
+        <dependencies>
+          <dependency>
+            <groupId>@project.groupId@</groupId>
+            <artifactId>@project.artifactId@</artifactId>
+            <version>@project.version@</version>
+          </dependency>
+        </dependencies>
+
+        <configuration>
+          <rules>
+            <enforceBytecodeVersion>
+              <maxJdkVersion>1.8</maxJdkVersion>
+              <strict>true</strict>
+            </enforceBytecodeVersion>
+          </rules>
+        </configuration>
+
+        <executions>
+          <execution>
+            <phase>compile</phase>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+</project>

src/it/enforce-bytecode-version-multirelease-strict/verify.groovy

@@ -0,0 +1,9 @@
+File file = new File( basedir, "build.log" );
+assert file.exists();
+
+String text = file.getText("utf-8");
+
+assert ! text.contains( '[INFO] Adding ignore: module-info' )
+assert text.contains( 'Found Banned Dependency: org.apache.logging.log4j:log4j-api:jar:2.17.2' )
+
+return true;

src/main/java/org/apache/maven/plugins/enforcer/EnforceBytecodeVersion.java

@@ -48,7 +48,7 @@
 
 /**
  * Enforcer rule that will check the bytecode version of each class of each dependency.
- * 
+ *
  * @see <a href="http://en.wikipedia.org/wiki/Java_class_file#General_layout">Java class file general layout</a>
  * @since 1.0-alpha-4
  */
@@ -148,7 +148,7 @@ static String renderVersion( int major, int minor )
 
     /**
      * This parameter is here for potentially advanced use cases, but it seems like it is actually always 0.
-     * 
+     *
      * @see #maxJavaMajorVersionNumber
      * @see <a href="https://en.wikipedia.org/wiki/Java_class_file#General_layout">Java class file general layout</a>
      */
@@ -167,6 +167,11 @@ static String renderVersion( int major, int minor )
      */
     private String[] ignoreClasses;
 
+    /**
+     * Process module-info and Multi-Release JAR classes if true
+     */
+    private boolean strict = false;
+
     /**
      * Optional list of dependency scopes to ignore. {@code test} and {@code provided} make sense here.
      */
@@ -240,7 +245,7 @@ private void computeParameters()
                         "\"1.7\", \"8\", \"11\", \"12\", \"13\", \"14\", \"15\", \"16\", \"17\"" );
             }
             maxJavaMajorVersionNumber = needle;
-            if ( needle < 53 )
+            if ( !strict && needle < 53 )
             {
                 IgnorableDependency ignoreModuleInfoDependency = new IgnorableDependency();
                 ignoreModuleInfoDependency.applyIgnoreClasses(DEFAULT_CLASSES_IGNORE_BEFORE_JDK_9, false );
@@ -342,17 +347,17 @@ private String isBadArtifact( Artifact a )
                     int major = ( magicAndClassFileVersion[6] << 8 ) + magicAndClassFileVersion[7];
 
                     // Assuming regex match is more expensive, verify bytecode versions first
-                    
+
                     if ( ( major > maxJavaMajorVersionNumber )
                         || ( major == maxJavaMajorVersionNumber && minor > maxJavaMinorVersionNumber ) )
                     {
-                        
+
                         Matcher matcher = MULTIRELEASE.matcher( entry.getName() );
-                        
-                        if ( matcher.matches() )
+
+                        if ( !strict && matcher.matches() )
                         {
                             Integer maxExpectedMajor = JDK_TO_MAJOR_VERSION_NUMBER_MAPPING.get( matcher.group( 1 ) );
-                            
+
                             if (maxExpectedMajor == null) {
                                 getLog().warn( "Unknown bytecodeVersion for " + a + " : "
                                                 + entry.getName() + ": got " + maxExpectedMajor + " class-file-version" );
@@ -423,6 +428,15 @@ public void setSearchTransitive( boolean theSearchTransitive )
         this.searchTransitive = theSearchTransitive;
     }
 
+    /**
+     * Process module-info and Multi-Release JAR classes if true
+     * @param strict the strictness to set
+     */
+    public void setStrict( boolean strict )
+    {
+        this.strict = strict;
+    }
+
     // copied from RequireReleaseDeps
     /*
      * Filter the dependency artifacts according to the includes and excludes If includes and excludes are both null,

src/site/apt/enforceBytecodeVersion.apt.vm

@@ -43,9 +43,11 @@ Enforce Bytecode Version
 
    * ignoreOptionals - a boolean, if <<<true>>> all dependencies which have <<<<optional>true</optional>>>> are ignored.
 
+   * strict - a boolean, if <<<true>>> process module-info and Multi-Release JAR classes
+
    []
 
-Note 
+Note
   Sample Plugin Configuration:
 
 +---+