DATAKV-280 - Enable building with Java 11.

Rely on inherited enforcer plugin configuration. Disable Querydsl tests that cannot be executed with Java9+.

.travis.yml

@@ -1,23 +1,9 @@
 language: java
 
-jdk:
-  - oraclejdk8
-
-addons:
-  apt:
-    packages:
-    - oracle-java8-installer
-
 cache:
   directories:
     - $HOME/.m2
 
-sudo: false
-
 install: true
 
-script: mvn clean dependency:list test -Dsort
-
-notifications:
-  slack:
-    secure: e9Mgff6nnlx6KEnQalzKmqviOUGdnrwgdIFxoFzNZLsVomBZtp7UhxP4zBPnVjwPPH30d3oT8qirB4xraQtZBn5esj1fdav2yrtlfYEQnoYvKRiZE9ZfNWcOaqoaPz3uBSNPcxbS3mkLr3pTTpQ20eSQGlnG36PvWLRQkD89gjk=
+script: "./mvnw clean dependency:list test -Pjava11,${PROFILE} -Dsort -B"

Jenkinsfile

@@ -12,7 +12,28 @@ pipeline {
 	}
 
 	stages {
-		stage("Test") {
+		stage("test: baseline (jdk8)") {
+			when {
+				anyOf {
+					branch 'master'
+					not { triggeredBy 'UpstreamCause' }
+				}
+			}
+			agent {
+				docker {
+					image 'adoptopenjdk/openjdk8:latest'
+					label 'data'
+					args '-v $HOME:/tmp/jenkins-home'
+				}
+			}
+			options { timeout(time: 30, unit: 'MINUTES') }
+			steps {
+				sh 'rm -rf ?'
+				sh 'MAVEN_OPTS="-Duser.name=jenkins -Duser.home=/tmp/jenkins-home" ./mvnw clean dependency:list test -Dsort -U -B'
+			}
+		}
+
+		stage("Test other configurations") {
 			when {
 				anyOf {
 					branch 'master'
@@ -20,10 +41,10 @@ pipeline {
 				}
 			}
 			parallel {
-				stage("test: baseline") {
+				stage("test: baseline (jdk11)") {
 					agent {
 						docker {
-							image 'adoptopenjdk/openjdk8:latest'
+							image 'adoptopenjdk/openjdk11:latest'
 							label 'data'
 							args '-v $HOME:/tmp/jenkins-home'
 						}
@@ -31,11 +52,27 @@ pipeline {
 					options { timeout(time: 30, unit: 'MINUTES') }
 					steps {
 						sh 'rm -rf ?'
-						sh 'MAVEN_OPTS="-Duser.name=jenkins -Duser.home=/tmp/jenkins-home" ./mvnw clean dependency:list test -Dsort -U -B'
+						sh 'MAVEN_OPTS="-Duser.name=jenkins -Duser.home=/tmp/jenkins-home" ./mvnw -Pjava11 clean dependency:list test -Dsort -U -B'
+					}
+				}
+
+				stage("test: baseline (jdk13)") {
+					agent {
+						docker {
+							image 'adoptopenjdk/openjdk13:latest'
+							label 'data'
+							args '-v $HOME:/tmp/jenkins-home'
+						}
+					}
+					options { timeout(time: 30, unit: 'MINUTES') }
+					steps {
+						sh 'rm -rf ?'
+						sh 'MAVEN_OPTS="-Duser.name=jenkins -Duser.home=/tmp/jenkins-home" ./mvnw -Pjava11 clean dependency:list test -Dsort -U -B'
 					}
 				}
 			}
 		}
+
 		stage('Release to artifactory') {
 			when {
 				anyOf {

pom.xml

@@ -76,27 +76,6 @@
 				</executions>
 			</plugin>
 
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-enforcer-plugin</artifactId>
-				<version>1.3.1</version>
-				<executions>
-					<execution>
-						<id>enforce-rules</id>
-						<goals>
-							<goal>enforce</goal>
-						</goals>
-					</execution>
-				</executions>
-				<configuration>
-					<rules>
-						<requireJavaVersion>
-							<version>[1.8,1.9)</version>
-						</requireJavaVersion>
-					</rules>
-				</configuration>
-			</plugin>
-
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-assembly-plugin</artifactId>

src/test/java/org/springframework/data/keyvalue/core/SpelQueryEngineUnitTests.java

@@ -21,6 +21,7 @@ import static org.mockito.Mockito.*;
 import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collection;
 import java.util.List;
 
 import org.junit.Before;
@@ -70,8 +71,9 @@ public class SpelQueryEngineUnitTests {
 
 		doReturn(people).when(adapter).getAllOf(anyString());
 
-		assertThat(engine.execute(createQueryForMethodWithArgs("findByFirstname", "bob"), null, -1, -1, anyString()))
-				.containsExactly(BOB_WITH_FIRSTNAME);
+		Collection result = engine.execute(createQueryForMethodWithArgs("findByFirstname", "bob"), null, -1, -1,
+				anyString());
+		assertThat(result).containsExactly(BOB_WITH_FIRSTNAME);
 	}
 
 	@Test // DATAKV-114

src/test/java/org/springframework/data/map/QuerydslKeyValueRepositoryUnitTests.java

@@ -16,10 +16,12 @@
 package org.springframework.data.map;
 
 import static org.assertj.core.api.Assertions.*;
+import static org.assertj.core.api.Assumptions.*;
 
 import java.util.List;
 import java.util.Optional;
 
+import org.junit.Before;
 import org.junit.Test;
 
 import org.springframework.dao.IncorrectResultSizeDataAccessException;
@@ -34,6 +36,7 @@ import org.springframework.data.keyvalue.repository.support.QuerydslKeyValueRepo
 import org.springframework.data.map.QuerydslKeyValueRepositoryUnitTests.QPersonRepository;
 import org.springframework.data.querydsl.QSort;
 import org.springframework.data.querydsl.QuerydslPredicateExecutor;
+import org.springframework.data.util.Version;
 
 import com.google.common.collect.Lists;
 
@@ -47,6 +50,11 @@ import com.google.common.collect.Lists;
  */
 public class QuerydslKeyValueRepositoryUnitTests extends AbstractRepositoryUnitTests<QPersonRepository> {
 
+	@Before
+	public void before() {
+		assumeThat(Version.javaVersion().toString()).startsWith("1.8");
+	}
+
 	@Test // DATACMNS-525
 	public void findOneIsExecutedCorrectly() {