Build Multi-Release Jar

.travis.yml

@@ -1,6 +1,6 @@
 language: java
 jdk:
-  - openjdk8
+  - openjdk11
 
 # whitelist
 branches:

README.md

@@ -56,9 +56,9 @@ You can also depend on latest snapshot from this repository (live on the edge) b
 
 Build it from source
 ==========
-JCTools is maven built and requires an existing Maven installation and JDK8 (only for building, runtime is 1.6 compliant).
+JCTools is maven built and requires an existing Maven installation and JDK11 (only for building, runtime is 1.6 compliant).
 
-With 'MAVEN_HOME/bin' on the path and JDK8 set to your 'JAVA_HOME' you should be able to run "mvn install" from this
+With 'MAVEN_HOME/bin' on the path and JDK11 set to your 'JAVA_HOME' you should be able to run "mvn install" from this
 directory.
 
 

jctools-core/pom.xml

@@ -53,6 +53,26 @@
 
 	<build>
 		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>3.8.1</version>
+				<executions>
+					<execution>
+						<id>compile-java11</id>
+						<goals>
+							<goal>compile</goal>
+						</goals>
+						<configuration>
+							<release>${java.multi-release.version}</release>
+							<compileSourceRoots>
+								<compileSourceRoot>${project.basedir}/src/main/java${java.multi-release.version}</compileSourceRoot>
+							</compileSourceRoots>
+							<multiReleaseOutput>true</multiReleaseOutput>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-surefire-plugin</artifactId>
@@ -66,11 +86,12 @@
 			<plugin>
 				<groupId>org.apache.felix</groupId>
 				<artifactId>maven-bundle-plugin</artifactId>
-				<version>4.2.1</version>
+				<version>5.1.2</version>
 				<extensions>true</extensions>
 				<configuration>
 					<instructions>
 						<Import-Package>sun.misc;resolution:=optional</Import-Package>
+						<Export-Package>org.jctools.*</Export-Package>
 					</instructions>
 				</configuration>
 			</plugin>
@@ -122,6 +143,7 @@
 					<archive>
 						<manifestEntries>
 							<Automatic-Module-Name>org.jctools.core</Automatic-Module-Name>
+							<Multi-Release>true</Multi-Release>
 						</manifestEntries>
 					</archive>
 				</configuration>

jctools-core/src/main/java/org/jctools/util/ThreadUtil.java

@@ -0,0 +1,25 @@
+/*
+ * Licensed 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.
+ */
+package org.jctools.util;
+
+@InternalAPI
+public final class ThreadUtil {
+
+    private ThreadUtil() {}
+
+    public static void onSpinWait() {
+
+    }
+
+}

jctools-core/src/main/java11/module-info.java

@@ -0,0 +1,6 @@
+module org.jctools.core {
+    exports org.jctools.counters;
+    exports org.jctools.maps;
+    exports org.jctools.queues;
+    exports org.jctools.util;
+}

jctools-core/src/main/java11/org/jctools/util/ThreadUtil.java

@@ -0,0 +1,25 @@
+/*
+ * Licensed 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.
+ */
+package org.jctools.util;
+
+@InternalAPI
+public final class ThreadUtil {
+
+    private ThreadUtil() {}
+
+    public static void onSpinWait() {
+        Thread.onSpinWait();
+    }
+
+}

pom.xml

@@ -51,6 +51,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <java.version>1.6</java.version>
         <java.test.version>1.8</java.test.version>
+        <java.multi-release.version>11</java.multi-release.version>
 
         <maven.compiler.source>${java.version}</maven.compiler.source>
         <maven.compiler.target>${java.version}</maven.compiler.target>
@@ -98,7 +99,7 @@
                         <configuration>
                             <rules>
                                 <requireJavaVersion>
-                                    <version>${java.test.version}</version>
+                                    <version>${java.multi-release.version}</version>
                                 </requireJavaVersion>
                             </rules>
                         </configuration>