Merge pull request #59 from spotify/fix-java-compatibility

Fix library to release java 8 compatible jars

README.md

@@ -5,13 +5,14 @@ Guava's ListenableFuture class
 
 ### Build status
 
-[![Travis](https://api.travis-ci.org/spotify/futures-extra.svg?branch=master)](https://travis-ci.org/spotify/futures-extra)
+[![Build Status](https://github.com/spotify/futures-extra/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/spotify/futures-extra/actions/workflows/ci.yml?query=branch%3Amaster)
 [![Coverage Status](http://img.shields.io/coveralls/spotify/futures-extra/master.svg)](https://coveralls.io/r/spotify/futures-extra?branch=master)
 
 ### Maven central
 
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.spotify/futures-extra/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.spotify/futures-extra)
 
+
 ### Build dependencies
 * Java 8 or higher
 * Maven

pom.xml

@@ -1,16 +1,14 @@
 <?xml version="1.0"?>
-<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">
+<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>
   <version>4.3.3-SNAPSHOT</version>
   <artifactId>futures-extra</artifactId>
   <packaging>jar</packaging>
 
   <name>futures-extra</name>
 
-  <properties>
-    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-  </properties>
-
   <parent>
     <groupId>com.spotify</groupId>
     <artifactId>foss-root</artifactId>
@@ -155,8 +153,6 @@
           <failOnViolation>true</failOnViolation>
           <failsOnError>true</failsOnError>
           <maxAllowedViolations>0</maxAllowedViolations>
-          <!-- checkstyle does not support JPMS yet -->
-          <excludes>**/module-info.java</excludes>
         </configuration>
         <executions>
           <execution>
@@ -175,51 +171,31 @@
           </dependency>
         </dependencies>
       </plugin>
-    </plugins>
-  </build>
-  <profiles>
-    <profile>
-      <id>jdk8</id>
-      <activation>
-        <jdk>1.8</jdk>
-      </activation>
-      <properties>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
-      </properties>
-      <build>
-        <plugins>
-          <plugin>
-            <groupId>org.apache.maven.plugins</groupId>
-            <artifactId>maven-compiler-plugin</artifactId>
-            <configuration>
-              <excludes>
-                <exclude>module-info.java</exclude>
-              </excludes>
-            </configuration>
-          </plugin>
-        </plugins>
-      </build>
-    </profile>
-    <profile>
-      <id>jdk9+</id>
-      <activation>
-        <jdk>[9,)</jdk>
-      </activation>
-      <properties>
-        <maven.compiler.release>11</maven.compiler.release>
-      </properties>
-      <build>
-        <plugins>
-          <plugin>
-            <groupId>org.apache.maven.plugins</groupId>
-            <artifactId>maven-compiler-plugin</artifactId>
+      <plugin>
+        <artifactId>maven-enforcer-plugin</artifactId>
+        <executions>
+          <execution>
+            <id>enforce-bytecode-version</id>
             <configuration>
-              <testExcludes>**/module-info.java</testExcludes>
+              <rules>
+                <enforceBytecodeVersion>
+                  <maxJdkVersion>8</maxJdkVersion>
+                </enforceBytecodeVersion>
+              </rules>
             </configuration>
-          </plugin>
-        </plugins>
-      </build>
-    </profile>
-  </profiles>
+            <goals>
+              <goal>enforce</goal>
+            </goals>
+          </execution>
+        </executions>
+        <dependencies>
+          <dependency>
+            <groupId>org.codehaus.mojo</groupId>
+            <artifactId>extra-enforcer-rules</artifactId>
+            <version>1.7.0</version>
+          </dependency>
+        </dependencies>
+      </plugin>
+    </plugins>
+  </build>
 </project>