Merged changes from remote branch. Increased version to 1.0.23-SNAPSHOT.

Author: MichaelRoeder

.github/workflows/build.yml

@@ -0,0 +1,24 @@
+name: build
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Start Rabbit
+        run: make start-rabbit
+      - name: Build project
+        run: mvn install -DskipTests=true -Dmaven.javadoc.skip=true -B -V
+      - name: Run tests
+        run: mvn jacoco:prepare-agent test -B jacoco:report
+      - name: Upload tests
+        env:
+          CODACY_PROJECT_TOKEN: ${{ secrets.CODACY_PROJECT_TOKEN }}
+        run: |
+          LATEST_VERSION="$(curl -Ls https://api.bintray.com/packages/codacy/Binaries/codacy-coverage-reporter/versions/_latest | jq -r .name)"
+          curl -Ls -o codacy-coverage-reporter "https://dl.bintray.com/codacy/Binaries/${LATEST_VERSION}/codacy-coverage-reporter-linux"
+          chmod +x codacy-coverage-reporter
+          ./codacy-coverage-reporter report -l Java -r target/site/jacoco/jacoco.xml
+

.travis.yml

@@ -1,4 +1,4 @@
-[![Build Status](https://travis-ci.org/hobbit-project/core.svg?branch=master)](https://travis-ci.org/hobbit-project/core)
+![Build Status](https://github.com/hobbit-project/core/workflows/build/badge.svg) [![Codacy Badge](https://app.codacy.com/project/badge/Grade/cab3efc1ece64aa4ba189e3e3d465ede)](https://www.codacy.com/manual/MichaelRoeder/core/dashboard?utm_source=github.com&utm_medium=referral&utm_content=hobbit-project/core&utm_campaign=Badge_Grade) [![Codacy Badge](https://app.codacy.com/project/badge/Coverage/cab3efc1ece64aa4ba189e3e3d465ede)](https://www.codacy.com/manual/MichaelRoeder/core/dashboard?utm_source=github.com&utm_medium=referral&utm_content=hobbit-project/core&utm_campaign=Badge_Coverage)
 
 # core
 This library offers some main functionalities and utilities for the Hobbit platform project. For more information take a look at the project web page (<http://www.project-hobbit.eu>) or at the Hobbit platform project on github (<https://github.com/hobbit-project/platform>).

README.md

@@ -12,7 +12,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.hobbit</groupId>
     <artifactId>core</artifactId>
-    <version>1.0.21-SNAPSHOT</version>
+    <version>1.0.23-SNAPSHOT</version>
 
     <!-- LICENSE -->
     <licenses>
@@ -175,7 +175,7 @@
             <plugin>
                 <groupId>org.jacoco</groupId>
                 <artifactId>jacoco-maven-plugin</artifactId>
-                <version>0.8.5</version>
+                <version>0.8.7</version>
                 <executions>
                     <execution>
                         <id>default-prepare-agent</id>
@@ -193,4 +193,16 @@
             </plugin>
         </plugins>
     </build>
+    <distributionManagement>
+        <repository>
+            <id>org.aksw.maven.internal</id>
+            <name>University Leipzig, AKSW Maven2 Repository</name>
+            <url>https://maven.aksw.org/repository/internal</url>
+        </repository>
+        <snapshotRepository>
+            <id>org.aksw.maven.snapshots</id>
+            <name>University Leipzig, AKSW Maven2 Repository</name>
+            <url>https://maven.aksw.org/repository/snapshots</url>
+        </snapshotRepository>
+    </distributionManagement>
 </project>

pom.xml

@@ -88,7 +88,7 @@ public abstract class AbstractComponent implements Component {
      * </pre>
      */
     public AbstractComponent() {
-        HobbitConfiguration configuration = new HobbitConfiguration();
+        configuration = new HobbitConfiguration();
         configuration.addConfiguration(new EnvironmentConfiguration());
     }
 

src/main/java/org/hobbit/core/components/AbstractComponent.java

@@ -329,7 +329,7 @@ protected static <T> List<T> getObjectNodes(Model model, Resource subject, Prope
                 }
             }
         }
-        return null;
+        return result;
     }
 
     /**