Require at least Java 11 for building (#29)

Still target Java 8 for running
Update plugins and dependencies

Author: kwin

.github/workflows/maven.yml

@@ -29,8 +29,8 @@ jobs:
   build:
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest] # Windows doe not yet work
-        jdk: [8, 11, 17]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        jdk: [11, 17]
         include:
           # lengthy build steps should only be performed on linux with Java 11 (SonarQube analysis, deployment)
           - os: ubuntu-latest

pom.xml

@@ -52,8 +52,7 @@
     <properties>
         <maven.version>3.5.4</maven.version>
         <java.target.version>8</java.target.version> <!-- used for compiler plugin, javadoc plugin and animal-sniffer, for compatibility reasons with Java 9 only the values 6,7,8 and 9 is allowed -->
-        <maven.compiler.source>1.${java.target.version}</maven.compiler.source>
-        <maven.compiler.target>1.${java.target.version}</maven.compiler.target>
+        <maven.compiler.release>${java.target.version}</maven.compiler.release>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <arguments /> <!-- additional arguments for the forked Maven run during releases -->
     </properties>
@@ -92,7 +91,7 @@
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter</artifactId>
-            <version>5.7.0</version>
+            <version>5.8.2</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -159,36 +158,28 @@
                 </plugin>
                 <plugin>
                     <artifactId>maven-javadoc-plugin</artifactId>
-                    <version>3.2.0</version>
-                    <configuration>
-                        <source>8</source>
-                    </configuration>
+                    <version>3.3.1</version>
                 </plugin>
                 <plugin>
                     <artifactId>maven-source-plugin</artifactId>
                     <version>3.2.1</version>
                 </plugin>
                 <plugin>
                     <artifactId>maven-release-plugin</artifactId>
-                    <version>3.0.0-M1</version>
+                    <version>3.0.0-M4</version>
                 </plugin>
                 <plugin>
                     <artifactId>maven-dependency-plugin</artifactId>
-                    <version>3.1.2</version>
+                    <version>3.2.0</version>
                 </plugin>
                 <plugin>
                     <artifactId>maven-enforcer-plugin</artifactId>
                     <version>3.0.0-M3</version>
                 </plugin>
-                <plugin>
-                    <groupId>org.codehaus.mojo</groupId>
-                    <artifactId>animal-sniffer-maven-plugin</artifactId>
-                    <version>1.20</version>
-                </plugin>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-gpg-plugin</artifactId>
-                    <version>1.6</version>
+                    <version>3.0.1</version>
                 </plugin>
                 <plugin>
                     <groupId>org.sonatype.plugins</groupId>
@@ -203,7 +194,7 @@
                 <plugin>
                     <groupId>org.jacoco</groupId>
                     <artifactId>jacoco-maven-plugin</artifactId>
-                    <version>0.8.6</version>
+                    <version>0.8.7</version>
                 </plugin>
                 <plugin>
                     <artifactId>maven-invoker-plugin</artifactId>
@@ -224,7 +215,7 @@
                         <configuration>
                             <rules>
                                 <requireJavaVersion>
-                                    <version>1.${java.target.version}</version>
+                                    <version>11</version><!-- require at least Java 11 for building, but build for Java 8 -->
                                 </requireJavaVersion>
                                 <requireMavenVersion>
                                     <version>${maven.version}</version>
@@ -234,27 +225,6 @@
                     </execution>
                 </executions>
             </plugin>
-            <!-- check with animal sniffer (http://www.mojohaus.org/animal-sniffer/), should only be used in JDKs prior version 9 -->
-            <plugin>
-                <groupId>org.codehaus.mojo</groupId>
-                <artifactId>animal-sniffer-maven-plugin</artifactId>
-                <configuration>
-                    <signature>
-                        <groupId>org.codehaus.mojo.signature</groupId>
-                        <artifactId>java1${java.target.version}</artifactId>
-                        <version>1.0</version>
-                    </signature>
-                </configuration>
-                <executions>
-                    <execution>
-                        <id>check-java-compatibility</id>
-                        <phase>process-classes</phase>
-                        <goals>
-                            <goal>check</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-invoker-plugin</artifactId>