[MCOMPILER 366] - Warning about automodules should provide the list of offending libraries
 - Collected filename based automodules detected and added to the log message.
 - Updated unit tests accordingly.
 - Added new integration test with 2 modules.
 - Make unit/integration tests Java 12 compatible
diff --git a/src/it/MCOMPILER-366/invoker.properties b/src/it/MCOMPILER-366/invoker.properties
new file mode 100644
index 0000000..9511718
--- /dev/null
+++ b/src/it/MCOMPILER-366/invoker.properties
@@ -0,0 +1,18 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+# 
+#   http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+invoker.java.version = 9+
diff --git a/src/it/MCOMPILER-366/pom.xml b/src/it/MCOMPILER-366/pom.xml
new file mode 100644
index 0000000..35444fc
--- /dev/null
+++ b/src/it/MCOMPILER-366/pom.xml
@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one
+  ~ or more contributor license agreements.  See the NOTICE file
+  ~ distributed with this work for additional information
+  ~ regarding copyright ownership.  The ASF licenses this file
+  ~ to you under the Apache License, Version 2.0 (the
+  ~ "License"); you may not use this file except in compliance
+  ~ with the License.  You may obtain a copy of the License at
+  ~
+  ~   http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing,
+  ~ software distributed under the License is distributed on an
+  ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  ~ KIND, either express or implied.  See the License for the
+  ~ specific language governing permissions and limitations
+  ~ under the License.
+  -->
+
+<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/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>org.apache.maven.plugins.compiler.it</groupId>
+  <artifactId>mcompiler-366</artifactId>
+  <version>1.0-SNAPSHOT</version>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+
+  <build>
+    <pluginManagement>
+      <plugins>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-compiler-plugin</artifactId>
+          <version>@project.version@</version>
+          <configuration>
+            <release>9</release>
+          </configuration>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+  </build>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.codehaus.plexus</groupId>
+      <artifactId>plexus-utils</artifactId>
+      <version>2.0.4</version>
+    </dependency>
+    <dependency>
+      <groupId>org.codehaus.plexus</groupId>
+      <artifactId>plexus-resources</artifactId>
+      <version>1.1.0</version>
+    </dependency>
+  </dependencies>
+</project>
diff --git a/src/it/MCOMPILER-366/src/main/java/module-info.java b/src/it/MCOMPILER-366/src/main/java/module-info.java
new file mode 100644
index 0000000..95e7266
--- /dev/null
+++ b/src/it/MCOMPILER-366/src/main/java/module-info.java
@@ -0,0 +1,24 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+module lib 
+{
+    requires plexus.utils;
+    requires plexus.resources;
+    exports org.maven.test;
+}
\ No newline at end of file
diff --git a/src/it/MCOMPILER-366/src/main/java/org/maven/test/Main.java b/src/it/MCOMPILER-366/src/main/java/org/maven/test/Main.java
new file mode 100644
index 0000000..f2c4a2f
--- /dev/null
+++ b/src/it/MCOMPILER-366/src/main/java/org/maven/test/Main.java
@@ -0,0 +1,34 @@
+package org.maven.test;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import org.codehaus.plexus.util.StringUtils;
+import org.codehaus.plexus.resource.ResourceManager;
+
+public class Main {
+
+    /**
+     * @param args
+     */
+    public static void main(String[] args) {
+        System.out.println( StringUtils.concatenate( args ) );
+        ResourceManager manager = null;
+    }
+}
\ No newline at end of file
diff --git a/src/it/MCOMPILER-366/verify.groovy b/src/it/MCOMPILER-366/verify.groovy
new file mode 100644
index 0000000..c5a90ad
--- /dev/null
+++ b/src/it/MCOMPILER-366/verify.groovy
@@ -0,0 +1,22 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+buildLog = new File( basedir, 'build.log' ).text;
+
+assert buildLog.contains("[WARNING] * Required filename-based automodules detected: [plexus-utils-2.0.4.jar, plexus-resources-1.1.0.jar]. Please don't publish this project to a public artifact repository! *");
diff --git a/src/it/automodules-application/verify.groovy b/src/it/automodules-application/verify.groovy
index 4ce088d..7f2654b 100644
--- a/src/it/automodules-application/verify.groovy
+++ b/src/it/automodules-application/verify.groovy
@@ -19,4 +19,4 @@
 

 buildLog = new File( basedir, 'build.log' ).text;

 

-assert buildLog.contains("[INFO] Required filename-based automodules detected. Please don't publish this project to a public artifact repository!");

+assert buildLog.contains("[INFO] Required filename-based automodules detected: [plexus-utils-2.0.4.jar]. Please don't publish this project to a public artifact repository!");

diff --git a/src/it/automodules-library/verify.groovy b/src/it/automodules-library/verify.groovy
index fb2d1d1..6a014a5 100644
--- a/src/it/automodules-library/verify.groovy
+++ b/src/it/automodules-library/verify.groovy
@@ -19,4 +19,4 @@
 

 buildLog = new File( basedir, 'build.log' ).text;

 

-assert buildLog.contains("[WARNING] * Required filename-based automodules detected. Please don't publish this project to a public artifact repository! *");

+assert buildLog.contains("[WARNING] * Required filename-based automodules detected: [plexus-utils-2.0.4.jar]. Please don't publish this project to a public artifact repository! *");

diff --git a/src/it/automodules-transitive-module/verify.groovy b/src/it/automodules-transitive-module/verify.groovy
index fb2d1d1..6a014a5 100644
--- a/src/it/automodules-transitive-module/verify.groovy
+++ b/src/it/automodules-transitive-module/verify.groovy
@@ -19,4 +19,4 @@
 

 buildLog = new File( basedir, 'build.log' ).text;

 

-assert buildLog.contains("[WARNING] * Required filename-based automodules detected. Please don't publish this project to a public artifact repository! *");

+assert buildLog.contains("[WARNING] * Required filename-based automodules detected: [plexus-utils-2.0.4.jar]. Please don't publish this project to a public artifact repository! *");

diff --git a/src/main/java/org/apache/maven/plugin/compiler/CompilerMojo.java b/src/main/java/org/apache/maven/plugin/compiler/CompilerMojo.java
index 568b063..8bc437b 100644
--- a/src/main/java/org/apache/maven/plugin/compiler/CompilerMojo.java
+++ b/src/main/java/org/apache/maven/plugin/compiler/CompilerMojo.java
@@ -250,26 +250,7 @@
                 
                 JavaModuleDescriptor moduleDescriptor = resolvePathsResult.getMainModuleDescriptor();
 
-                for ( Map.Entry<File, ModuleNameSource> entry : resolvePathsResult.getModulepathElements().entrySet() )
-                {
-                    if ( ModuleNameSource.FILENAME.equals( entry.getValue() ) )
-                    {
-                        final String message = "Required filename-based automodules detected. "
-                            + "Please don't publish this project to a public artifact repository!";
-
-                        if ( moduleDescriptor.exports().isEmpty() )
-                        {
-                            // application
-                            getLog().info( message );
-                        }
-                        else
-                        {
-                            // library
-                            writeBoxedWarning( message );
-                        }
-                        break;
-                    }
-                }
+                detectFilenameBasedAutomodules( resolvePathsResult, moduleDescriptor );
                 
                 for ( Map.Entry<File, JavaModuleDescriptor> entry : resolvePathsResult.getPathElements().entrySet() )
                 {
@@ -324,6 +305,37 @@
             modulepathElements = Collections.emptyList();
         }
     }
+
+    private void detectFilenameBasedAutomodules( final ResolvePathsResult<File> resolvePathsResult,
+            final JavaModuleDescriptor moduleDescriptor )
+    {
+        List<String> automodulesDetected = new ArrayList<>();
+        for ( Entry<File, ModuleNameSource> entry : resolvePathsResult.getModulepathElements().entrySet() )
+        {
+            if ( ModuleNameSource.FILENAME.equals( entry.getValue() ) )
+            {
+                automodulesDetected.add( entry.getKey().getName() );
+            }
+        }
+
+        if ( !automodulesDetected.isEmpty() )
+        {
+            final String message = "Required filename-based automodules detected: "
+                    +  automodulesDetected + ". "
+                    + "Please don't publish this project to a public artifact repository!";
+
+            if ( moduleDescriptor.exports().isEmpty() )
+            {
+                // application
+                getLog().info( message );
+            }
+            else
+            {
+                // library
+                writeBoxedWarning( message );
+            }
+        }
+    }
     
     private List<File> getCompileClasspathElements( MavenProject project )
     {