Add module descriptor

This closes #14

.travis.yml

@@ -6,7 +6,6 @@ jdk:
   - openjdk10
   - openjdk11
   - openjdk-ea
-  - oraclejdk-ea
 
 dist: trusty
 

plexus-java/pom.xml

@@ -66,7 +66,7 @@
     <dependency>
       <groupId>org.ow2.asm</groupId>
       <artifactId>asm</artifactId>
-      <version>6.2</version>
+      <version>6.2.1</version>
     </dependency>
     <dependency>
       <groupId>com.thoughtworks.qdox</groupId>
@@ -119,7 +119,6 @@
             <plugin>
               <groupId>org.apache.maven.plugins</groupId>
               <artifactId>maven-compiler-plugin</artifactId>
-              <version>3.7.0</version>
               <executions>
                 <execution>
                   <id>jdk9</id>
@@ -128,10 +127,10 @@
                   </goals>
                   <configuration>
                     <release>9</release>
+                    <multiReleaseOutput>true</multiReleaseOutput>
                     <compileSourceRoots>
                       <compileSourceRoot>${project.basedir}/src/main/java9</compileSourceRoot>
                     </compileSourceRoots>
-                    <outputDirectory>${project.build.outputDirectory}/META-INF/versions/9</outputDirectory>
                   </configuration>
                 </execution>
               </executions>

plexus-java/src/main/java9/module-info.java

@@ -0,0 +1,26 @@
+/*
+ * 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 org.codehaus.plexus.languages.java 
+{
+    requires com.thoughtworks.qdox;
+    requires org.objectweb.asm;
+
+    exports org.codehaus.plexus.languages.java.jpms;
+    exports org.codehaus.plexus.languages.java.version;
+}

plexus-java/src/test/java/org/codehaus/plexus/languages/java/jpms/LocationManagerIT.java

@@ -1,14 +1,32 @@
 package org.codehaus.plexus.languages.java.jpms;
 
+/*
+ * 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 static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.CoreMatchers.not;
 import static org.hamcrest.CoreMatchers.startsWith;
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertThat;
 import static org.junit.Assume.assumeThat;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.when;
 
-import java.io.IOException;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.Arrays;
@@ -20,6 +38,12 @@
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
 
+/**
+ * <strong>NOTE</strong> Eclipse users must disable the <code>Build automatically</code> option, 
+ * otherwise it'll continually rebuild the project, causing compilations or tests to fail. 
+ *  
+ * @author Robert Scholte
+ */
 @RunWith( org.mockito.junit.MockitoJUnitRunner.class )
 public class LocationManagerIT
 {

pom.xml

@@ -47,6 +47,11 @@
   <build>
     <pluginManagement>
       <plugins>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-compiler-plugin</artifactId>
+          <version>3.8.0</version>
+        </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-release-plugin</artifactId>