pom.xml

@@ -13,6 +13,8 @@
 		<directory-server-version>1.5.5</directory-server-version>
 		<io.netty-version>4.1.37.Final</io.netty-version>
 		<org.aspectj-version>1.9.2</org.aspectj-version>
+		<javax-jaxb.version>2.3.1</javax-jaxb.version>
+		<graalvm.version>19.1.1</graalvm.version>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<timestamp>${maven.build.timestamp}</timestamp>
 		<sonar.language>java</sonar.language>
@@ -148,6 +150,10 @@
 	</dependencyManagement>
 
 	<dependencies>
+		<dependency>
+			<groupId>javax.annotation</groupId>
+			<artifactId>javax.annotation-api</artifactId>
+		</dependency>
 		<dependency>
 			<groupId>commons-lang</groupId>
 			<artifactId>commons-lang</artifactId>
@@ -347,6 +353,16 @@
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-aspects</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.graalvm.js</groupId>
+			<artifactId>js</artifactId>
+			<version>${graalvm.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.graalvm.js</groupId>
+			<artifactId>js-scriptengine</artifactId>
+			<version>${graalvm.version}</version>
+		</dependency>
 		<dependency>
 			<groupId>org.mockito</groupId>
 			<artifactId>mockito-core</artifactId>
@@ -455,6 +471,14 @@
 						<artifactId>aspectjtools</artifactId>
 						<version>${org.aspectj-version}</version>
 					</dependency>
+					<!-- Workaround: Override unnecessary dependency which causes compatibility issues. -->
+					<dependency>
+						<groupId>com.sun</groupId>
+						<artifactId>tools</artifactId>
+						<version>${java.version}</version>
+						<scope>system</scope>
+						<systemPath>${project.basedir}/pom.xml</systemPath>
+					</dependency>
 				</dependencies>
 			</plugin>
 			<plugin>
@@ -597,6 +621,13 @@
 						</goals>
 					</execution>
 				</executions>
+				<dependencies>
+					<dependency>
+						<groupId>javax.xml.bind</groupId>
+						<artifactId>jaxb-api</artifactId>
+						<version>${javax-jaxb.version}</version>
+					</dependency>
+				</dependencies>
 			</plugin>
 			<plugin>
 				<groupId>pl.project13.maven</groupId>
@@ -611,6 +642,19 @@
 				</executions>
 			</plugin>
 		</plugins>
+
+		<!-- Workaround for JDK 11 support. See https://bugs.eclipse.org/bugs/show_bug.cgi?id=539791 -->
+		<extensions>
+			<extension>
+				<groupId>javax.annotation</groupId>
+				<artifactId>javax.annotation-api</artifactId>
+			</extension>
+			<extension>
+				<groupId>javax.annotation</groupId>
+				<artifactId>jsr250-api</artifactId>
+				<version>1.0</version>
+			</extension>
+		</extensions>
 	</build>
 
 	<name>ARSnova Backend</name>

src/main/java/de/thm/arsnova/persistence/couchdb/CouchDbInitializer.java

@@ -28,7 +28,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
 import javax.annotation.PostConstruct;
-import javax.script.Bindings;
 import javax.script.ScriptEngine;
 import javax.script.ScriptEngineManager;
 import javax.script.ScriptException;
@@ -56,7 +55,7 @@ import de.thm.arsnova.service.StatusService;
 @Component
 public class CouchDbInitializer implements ResourceLoaderAware {
 	private static final Logger logger = LoggerFactory.getLogger(CouchDbInitializer.class);
-	private final List<Bindings> docs = new ArrayList<>();
+	private final List<Map<String, Object>> docs = new ArrayList<>();
 
 	private ResourceLoader resourceLoader;
 	private MigrationExecutor migrationExecutor;
@@ -83,7 +82,7 @@ public class CouchDbInitializer implements ResourceLoaderAware {
 			final String js = FileCopyUtils.copyToString(new InputStreamReader(resource.getInputStream()));
 			/* Reset designDoc before parsing a new one. */
 			engine.eval("var designDoc = null;" + js);
-			final Bindings jsonObject = (Bindings) engine.eval("jsToJson(designDoc)");
+			final Map<String, Object> jsonObject = (Map<String, Object>) engine.eval("jsToJson(designDoc)");
 			docs.add(jsonObject);
 		}
 	}

src/main/java/de/thm/arsnova/websocket/handler/AuthChannelInterceptorAdapter.java

@@ -31,13 +31,16 @@ public class AuthChannelInterceptorAdapter implements ChannelInterceptor {
 	@Nullable
 	@Override
 	public Message<?> preSend(final Message<?> message, final MessageChannel channel) {
+		logger.trace("Inspecting incoming message: {}", message);
 		final StompHeaderAccessor accessor = StompHeaderAccessor.wrap(message);
 
 		final String sessionId = accessor.getSessionId();
 		if (accessor.getCommand() != null && accessor.getCommand().equals(StompCommand.CONNECT)) {
 			// user needs to authorize
+			logger.trace("Incoming message is a connect command");
 			final List<String> tokenList = accessor.getNativeHeader("token");
 			if (tokenList != null && tokenList.size() > 0) {
+				logger.trace("Adding token {} to the ws session mapping", tokenList.get(0));
 				final String token = tokenList.get(0);
 				service.addWsSessionToJwtMapping(sessionId, token);
 			} else {
@@ -46,9 +49,11 @@ public class AuthChannelInterceptorAdapter implements ChannelInterceptor {
 				return null;
 			}
 		} else {
+			logger.trace("Incoming message is anything but a connect command");
 			final List<String> userIdList = accessor.getNativeHeader("ars-user-id");
 			if (userIdList != null && userIdList.size() > 0) {
 				// user-id is given, check for auth
+				logger.trace("Checking user id with ws session mapping");
 				final String userId = userIdList.get(0);
 				final User u = service.getAuthenticatedUserByWsSession(sessionId);
 				if (u == null || !userId.equals(u.getId())) {