diff --git a/build.gradle b/build.gradle
index 0d98775..05ab537 100644
--- a/build.gradle
+++ b/build.gradle
@@ -14,7 +14,7 @@ ext {
 allprojects {
 
     group = 'org.xbib'
-    version = '1.0.4'
+    version = '1.0.5'
 
     apply plugin: 'java'
     apply plugin: 'maven'
diff --git a/content-rdf/src/main/java/org/xbib/content/rdf/RdfContent.java b/content-rdf/src/main/java/org/xbib/content/rdf/RdfContent.java
index 2034970..8e3962b 100644
--- a/content-rdf/src/main/java/org/xbib/content/rdf/RdfContent.java
+++ b/content-rdf/src/main/java/org/xbib/content/rdf/RdfContent.java
@@ -13,6 +13,5 @@ public interface RdfContent<P extends RdfContentParams> {
 
     RdfContentGenerator<P> createGenerator(OutputStream out) throws IOException;
 
-    RdfContentParser createParser(InputStream in) throws IOException;
-
+    RdfContentParser<P> createParser(InputStream in) throws IOException;
 }
diff --git a/content-rdf/src/main/java/org/xbib/content/rdf/RdfContentParser.java b/content-rdf/src/main/java/org/xbib/content/rdf/RdfContentParser.java
index e2d8975..830e4e0 100644
--- a/content-rdf/src/main/java/org/xbib/content/rdf/RdfContentParser.java
+++ b/content-rdf/src/main/java/org/xbib/content/rdf/RdfContentParser.java
@@ -5,10 +5,10 @@ import java.io.IOException;
 /**
  *
  */
-public interface RdfContentParser {
+public interface RdfContentParser<R extends RdfContentParams> {
 
     RdfContentType contentType();
 
-    RdfContentParser parse() throws IOException;
+    RdfContentParser<R> parse() throws IOException;
 
 }
diff --git a/content-rdf/src/main/java/org/xbib/content/rdf/RdfXContent.java b/content-rdf/src/main/java/org/xbib/content/rdf/RdfXContent.java
index c274623..7f8998b 100644
--- a/content-rdf/src/main/java/org/xbib/content/rdf/RdfXContent.java
+++ b/content-rdf/src/main/java/org/xbib/content/rdf/RdfXContent.java
@@ -33,7 +33,7 @@ public class RdfXContent implements RdfContent<RdfXContentParams> {
     }
 
     @Override
-    public RdfContentParser createParser(InputStream in) throws IOException {
+    public RdfContentParser<RdfXContentParams> createParser(InputStream in) throws IOException {
         throw new UnsupportedOperationException();
     }
 }
diff --git a/content-rdf/src/main/java/org/xbib/content/rdf/RouteRdfXContent.java b/content-rdf/src/main/java/org/xbib/content/rdf/RouteRdfXContent.java
index ea17b4f..b9ca2e8 100644
--- a/content-rdf/src/main/java/org/xbib/content/rdf/RouteRdfXContent.java
+++ b/content-rdf/src/main/java/org/xbib/content/rdf/RouteRdfXContent.java
@@ -14,7 +14,7 @@ public class RouteRdfXContent implements RdfContent<RouteRdfXContentParams> {
     private RouteRdfXContent() {
     }
 
-    public static final RouteRdfXContent routeRdfXContent() {
+    public static RouteRdfXContent routeRdfXContent() {
         return ROUTE_RDF_X_CONTENT;
     }
 
@@ -33,8 +33,8 @@ public class RouteRdfXContent implements RdfContent<RouteRdfXContentParams> {
     }
 
     @Override
-    public RdfContentParser createParser(InputStream in) throws IOException {
-        return null;
+    public RdfContentParser<RouteRdfXContentParams> createParser(InputStream in) throws IOException {
+        throw new UnsupportedOperationException();
     }
 
     /**
diff --git a/content-rdf/src/main/java/org/xbib/content/rdf/io/json/JsonContent.java b/content-rdf/src/main/java/org/xbib/content/rdf/io/json/JsonContent.java
index be9661f..02d0401 100644
--- a/content-rdf/src/main/java/org/xbib/content/rdf/io/json/JsonContent.java
+++ b/content-rdf/src/main/java/org/xbib/content/rdf/io/json/JsonContent.java
@@ -44,7 +44,7 @@ public class JsonContent implements RdfContent<JsonContentParams> {
     }
 
     @Override
-    public RdfContentParser createParser(InputStream in) throws IOException {
-        return new JsonContentParser(in);
+    public RdfContentParser<JsonContentParams> createParser(InputStream in) throws IOException {
+        return new JsonContentParser<>(in);
     }
 }
diff --git a/content-rdf/src/main/java/org/xbib/content/rdf/io/json/JsonContentParser.java b/content-rdf/src/main/java/org/xbib/content/rdf/io/json/JsonContentParser.java
index 1ce19fd..2f3e601 100644
--- a/content-rdf/src/main/java/org/xbib/content/rdf/io/json/JsonContentParser.java
+++ b/content-rdf/src/main/java/org/xbib/content/rdf/io/json/JsonContentParser.java
@@ -1,6 +1,7 @@
 package org.xbib.content.rdf.io.json;
 
 import org.xbib.content.rdf.RdfContentBuilder;
+import org.xbib.content.rdf.RdfContentParams;
 import org.xbib.content.rdf.RdfContentParser;
 import org.xbib.content.rdf.RdfContentType;
 import org.xbib.content.rdf.StandardRdfContentType;
@@ -18,14 +19,15 @@ import javax.xml.namespace.QName;
 
 /**
  * A parser for generic JSON (not JSON-LD) via JSON SaX adapter.
+ * @param <R> parameterized type
  */
-public class JsonContentParser implements RdfContentParser {
+public class JsonContentParser<R extends RdfContentParams> implements RdfContentParser<R> {
 
     private final Reader reader;
 
-    private XmlHandler<JsonContentParams> handler;
+    private XmlHandler<R> handler;
 
-    private RdfContentBuilder<JsonContentParams> builder;
+    private RdfContentBuilder<R> builder;
 
     private QName root;
 
@@ -42,27 +44,27 @@ public class JsonContentParser implements RdfContentParser {
         return StandardRdfContentType.JSON;
     }
 
-    public XmlHandler<JsonContentParams> getHandler() {
+    public XmlHandler<R> getHandler() {
         return handler;
     }
 
-    public JsonContentParser setHandler(XmlHandler<JsonContentParams> handler) {
+    public JsonContentParser<R> setHandler(XmlHandler<R> handler) {
         this.handler = handler;
         return this;
     }
 
-    public JsonContentParser root(QName root) {
+    public JsonContentParser<R> root(QName root) {
         this.root = root;
         return this;
     }
 
-    public JsonContentParser builder(RdfContentBuilder<JsonContentParams> builder) {
+    public JsonContentParser<R> builder(RdfContentBuilder<R> builder) {
         this.builder = builder;
         return this;
     }
 
     @Override
-    public JsonContentParser parse() throws IOException {
+    public JsonContentParser<R> parse() throws IOException {
         if (handler != null) {
             if (builder != null) {
                 handler.setBuilder(builder);
diff --git a/content-rdf/src/main/java/org/xbib/content/rdf/io/ntriple/NTripleContent.java b/content-rdf/src/main/java/org/xbib/content/rdf/io/ntriple/NTripleContent.java
index 8045373..4377d16 100644
--- a/content-rdf/src/main/java/org/xbib/content/rdf/io/ntriple/NTripleContent.java
+++ b/content-rdf/src/main/java/org/xbib/content/rdf/io/ntriple/NTripleContent.java
@@ -44,7 +44,7 @@ public class NTripleContent implements RdfContent<NTripleContentParams> {
     }
 
     @Override
-    public RdfContentParser createParser(InputStream in) throws IOException {
-        return new NTripleContentParser(in);
+    public RdfContentParser<NTripleContentParams> createParser(InputStream in) throws IOException {
+        return new NTripleContentParser<>(in);
     }
 }
diff --git a/content-rdf/src/main/java/org/xbib/content/rdf/io/ntriple/NTripleContentParser.java b/content-rdf/src/main/java/org/xbib/content/rdf/io/ntriple/NTripleContentParser.java
index 4e96653..b6f853f 100644
--- a/content-rdf/src/main/java/org/xbib/content/rdf/io/ntriple/NTripleContentParser.java
+++ b/content-rdf/src/main/java/org/xbib/content/rdf/io/ntriple/NTripleContentParser.java
@@ -1,6 +1,7 @@
 package org.xbib.content.rdf.io.ntriple;
 
 import org.xbib.content.rdf.RdfContentBuilder;
+import org.xbib.content.rdf.RdfContentParams;
 import org.xbib.content.rdf.RdfContentParser;
 import org.xbib.content.rdf.RdfContentType;
 import org.xbib.content.rdf.Resource;
@@ -24,8 +25,9 @@ import java.util.regex.PatternSyntaxException;
  * Parser for NTriple RDF format.
  * See also the <a href="http://www.w3.org/TR/rdf-testcases/#convert">NTriple
  * specification</a>.
+ * @param <R> RDF content parameter type
  */
-public class NTripleContentParser implements RdfContentParser {
+public class NTripleContentParser<R extends RdfContentParams> implements RdfContentParser<R> {
 
     private static final Resource resource = new DefaultAnonymousResource();
 
@@ -48,7 +50,7 @@ public class NTripleContentParser implements RdfContentParser {
 
     private boolean eof;
 
-    private RdfContentBuilder<NTripleContentParams> builder;
+    private RdfContentBuilder<R> builder;
 
     public NTripleContentParser(InputStream in) throws IOException {
         this(new InputStreamReader(in, StandardCharsets.UTF_8));
@@ -63,13 +65,13 @@ public class NTripleContentParser implements RdfContentParser {
         return StandardRdfContentType.NTRIPLE;
     }
 
-    public NTripleContentParser setBuilder(RdfContentBuilder<NTripleContentParams> builder) {
+    public NTripleContentParser<R> setBuilder(RdfContentBuilder<R> builder) {
         this.builder = builder;
         return this;
     }
 
     @Override
-    public NTripleContentParser parse() throws IOException {
+    public NTripleContentParser<R> parse() throws IOException {
         this.eof = false;
         try (BufferedReader br = new BufferedReader(reader)) {
             while (!eof) {
diff --git a/content-rdf/src/main/java/org/xbib/content/rdf/io/rdfxml/RdfXmlContent.java b/content-rdf/src/main/java/org/xbib/content/rdf/io/rdfxml/RdfXmlContent.java
index 880501b..5fba803 100644
--- a/content-rdf/src/main/java/org/xbib/content/rdf/io/rdfxml/RdfXmlContent.java
+++ b/content-rdf/src/main/java/org/xbib/content/rdf/io/rdfxml/RdfXmlContent.java
@@ -44,7 +44,7 @@ public class RdfXmlContent implements RdfContent<RdfXmlContentParams> {
     }
 
     @Override
-    public RdfContentParser createParser(InputStream in) throws IOException {
-        return new RdfXmlContentParser<RdfXmlContentParams>(in);
+    public RdfContentParser<RdfXmlContentParams> createParser(InputStream in) throws IOException {
+        return new RdfXmlContentParser<>(in);
     }
 }
diff --git a/content-rdf/src/main/java/org/xbib/content/rdf/io/rdfxml/RdfXmlContentParser.java b/content-rdf/src/main/java/org/xbib/content/rdf/io/rdfxml/RdfXmlContentParser.java
index cb95be1..a489fa7 100644
--- a/content-rdf/src/main/java/org/xbib/content/rdf/io/rdfxml/RdfXmlContentParser.java
+++ b/content-rdf/src/main/java/org/xbib/content/rdf/io/rdfxml/RdfXmlContentParser.java
@@ -52,7 +52,7 @@ import java.util.logging.Logger;
  * Note that the XMLLiteral datatype is not fully supported.
  * @param <R> parameter type
  */
-public class RdfXmlContentParser<R extends RdfContentParams> implements RdfConstants, RdfContentParser {
+public class RdfXmlContentParser<R extends RdfContentParams> implements RdfConstants, RdfContentParser<R> {
 
     private static final Logger logger = Logger.getLogger(RdfXmlContentParser.class.getName());
 
diff --git a/content-rdf/src/main/java/org/xbib/content/rdf/io/turtle/TurtleContent.java b/content-rdf/src/main/java/org/xbib/content/rdf/io/turtle/TurtleContent.java
index 4626bf2..a566cfa 100644
--- a/content-rdf/src/main/java/org/xbib/content/rdf/io/turtle/TurtleContent.java
+++ b/content-rdf/src/main/java/org/xbib/content/rdf/io/turtle/TurtleContent.java
@@ -44,8 +44,8 @@ public class TurtleContent implements RdfContent<TurtleContentParams> {
     }
 
     @Override
-    public RdfContentParser createParser(InputStream inputStream) throws IOException {
-        return new TurtleContentParser(inputStream);
+    public RdfContentParser<TurtleContentParams> createParser(InputStream inputStream) throws IOException {
+        return new TurtleContentParser<>(inputStream);
     }
 
 }
diff --git a/content-rdf/src/main/java/org/xbib/content/rdf/io/turtle/TurtleContentParser.java b/content-rdf/src/main/java/org/xbib/content/rdf/io/turtle/TurtleContentParser.java
index 83d4954..61d11d9 100644
--- a/content-rdf/src/main/java/org/xbib/content/rdf/io/turtle/TurtleContentParser.java
+++ b/content-rdf/src/main/java/org/xbib/content/rdf/io/turtle/TurtleContentParser.java
@@ -4,6 +4,7 @@ import org.xbib.content.rdf.Literal;
 import org.xbib.content.rdf.RdfContentBuilder;
 import org.xbib.content.rdf.RdfContentBuilderHandler;
 import org.xbib.content.rdf.RdfContentBuilderProvider;
+import org.xbib.content.rdf.RdfContentParams;
 import org.xbib.content.rdf.RdfContentParser;
 import org.xbib.content.rdf.RdfContentType;
 import org.xbib.content.rdf.Resource;
@@ -36,8 +37,9 @@ import java.util.logging.Logger;
  *
  * @see <a href="http://www.w3.org/TeamSubmission/turtle/">Turtle - Terse RDF
  * Triple Language</a>
+ * @param <R> RDF content type parameter
  */
-public class TurtleContentParser implements RdfContentParser {
+public class TurtleContentParser<R extends RdfContentParams> implements RdfContentParser<R> {
 
     private static final Logger logger = Logger.getLogger(TurtleContentParser.class.getName());
 
@@ -45,11 +47,11 @@ public class TurtleContentParser implements RdfContentParser {
 
     private final HashMap<String, Node> bnodes = new HashMap<>();
 
-    private RdfContentBuilderProvider<TurtleContentParams> provider;
+    private RdfContentBuilderProvider<R> provider;
 
-    private RdfContentBuilderHandler<TurtleContentParams> rdfContentBuilderHandler;
+    private RdfContentBuilderHandler<R> rdfContentBuilderHandler;
 
-    private RdfContentBuilder<TurtleContentParams> builder;
+    private RdfContentBuilder<R> builder;
 
     /**
      * The base IRI.
@@ -136,29 +138,29 @@ public class TurtleContentParser implements RdfContentParser {
         return StandardRdfContentType.TURTLE;
     }
 
-    public TurtleContentParser setRdfContentBuilderProvider(RdfContentBuilderProvider<TurtleContentParams> provider) {
+    public TurtleContentParser<R> setRdfContentBuilderProvider(RdfContentBuilderProvider<R> provider) {
         this.provider = provider;
         return this;
     }
 
-    public TurtleContentParser setRdfContentBuilderHandler(RdfContentBuilderHandler<TurtleContentParams>
+    public TurtleContentParser<R> setRdfContentBuilderHandler(RdfContentBuilderHandler<R>
                                                                    rdfContentBuilderHandler) {
         this.rdfContentBuilderHandler = rdfContentBuilderHandler;
         return this;
     }
 
-    public TurtleContentParser setBaseIRI(IRI baseIRI) {
+    public TurtleContentParser<R> setBaseIRI(IRI baseIRI) {
         this.baseIRI = baseIRI;
         return this;
     }
 
-    public TurtleContentParser context(XmlNamespaceContext context) {
+    public TurtleContentParser<R> context(XmlNamespaceContext context) {
         this.context = context;
         return this;
     }
 
     @Override
-    public TurtleContentParser parse() throws IOException {
+    public TurtleContentParser<R> parse() throws IOException {
         if (provider != null) {
             builder = provider.newContentBuilder();
             builder.startStream();
@@ -218,7 +220,7 @@ public class TurtleContentParser implements RdfContentParser {
      * relative URIs. It takes, itself, a relative URI, so it can be used to
      * change the base URI relative to the previous one.
      *
-     * @throws IOException
+     * @throws IOException if directive could not be parsed
      */
     private void parseDirective() throws IOException {
         String directive;
diff --git a/content-rdf/src/main/java/org/xbib/content/rdf/io/xml/XmlContent.java b/content-rdf/src/main/java/org/xbib/content/rdf/io/xml/XmlContent.java
index b0c31ba..815c442 100644
--- a/content-rdf/src/main/java/org/xbib/content/rdf/io/xml/XmlContent.java
+++ b/content-rdf/src/main/java/org/xbib/content/rdf/io/xml/XmlContent.java
@@ -44,7 +44,7 @@ public class XmlContent implements RdfContent<XmlContentParams> {
     }
 
     @Override
-    public RdfContentParser createParser(InputStream inputStream) throws IOException {
+    public RdfContentParser<XmlContentParams> createParser(InputStream inputStream) throws IOException {
         return new XmlContentParser<>(inputStream);
     }
 }
diff --git a/content-rdf/src/main/java/org/xbib/content/rdf/io/xml/XmlContentParser.java b/content-rdf/src/main/java/org/xbib/content/rdf/io/xml/XmlContentParser.java
index 9715c86..b167ee4 100644
--- a/content-rdf/src/main/java/org/xbib/content/rdf/io/xml/XmlContentParser.java
+++ b/content-rdf/src/main/java/org/xbib/content/rdf/io/xml/XmlContentParser.java
@@ -20,7 +20,7 @@ import java.nio.charset.StandardCharsets;
  * An XML reader for parsing XML into triples.
  * @param <P> parameter type
  */
-public class XmlContentParser<P extends RdfContentParams> implements RdfContentParser {
+public class XmlContentParser<P extends RdfContentParams> implements RdfContentParser<P> {
 
     private final Reader reader;
 
diff --git a/content-rdf/src/test/java/org/xbib/content/rdf/io/json/JsonReaderTest.java b/content-rdf/src/test/java/org/xbib/content/rdf/io/json/JsonReaderTest.java
index 5c488c8..af6d505 100644
--- a/content-rdf/src/test/java/org/xbib/content/rdf/io/json/JsonReaderTest.java
+++ b/content-rdf/src/test/java/org/xbib/content/rdf/io/json/JsonReaderTest.java
@@ -66,7 +66,7 @@ public class JsonReaderTest extends StreamTester {
         };
         RdfContentBuilder<JsonContentParams> builder = jsonBuilder();
         jsonHandler.setBuilder(builder);
-        new JsonContentParser(in)
+        new JsonContentParser<JsonContentParams>(in)
                 .setHandler(jsonHandler)
                 .root(new QName("http://purl.org/dc/elements/1.1/", "root", "dc"))
                 .parse();
diff --git a/content-rdf/src/test/java/org/xbib/content/rdf/io/ntriple/NTripleReaderTest.java b/content-rdf/src/test/java/org/xbib/content/rdf/io/ntriple/NTripleReaderTest.java
index af60e4c..98b15fc 100644
--- a/content-rdf/src/test/java/org/xbib/content/rdf/io/ntriple/NTripleReaderTest.java
+++ b/content-rdf/src/test/java/org/xbib/content/rdf/io/ntriple/NTripleReaderTest.java
@@ -22,7 +22,7 @@ public class NTripleReaderTest extends StreamTester {
             throw new IOException("file " + filename + " not found");
         }
         RdfContentBuilder<NTripleContentParams> builder = ntripleBuilder();
-        NTripleContentParser reader = new NTripleContentParser(in);
+        NTripleContentParser<NTripleContentParams> reader = new NTripleContentParser<>(in);
         reader.setBuilder(builder);
         reader.parse();
         //assertStream(getClass().getResource("rdfxml.ttl").openStream(),
diff --git a/content-rdf/src/test/java/org/xbib/content/rdf/io/turtle/TurtleConformanceTest.java b/content-rdf/src/test/java/org/xbib/content/rdf/io/turtle/TurtleConformanceTest.java
index 975f6ea..5220125 100644
--- a/content-rdf/src/test/java/org/xbib/content/rdf/io/turtle/TurtleConformanceTest.java
+++ b/content-rdf/src/test/java/org/xbib/content/rdf/io/turtle/TurtleConformanceTest.java
@@ -22,7 +22,7 @@ public class TurtleConformanceTest extends StreamTester {
         for (int n = 0; n < 30; n++) {
             String testNum = String.format("%02d", n);
             InputStream in = getClass().getResource("/turtle/test-" + testNum + ".ttl").openStream();
-            TurtleContentParser turtleParser = new TurtleContentParser(in)
+            TurtleContentParser<TurtleContentParams> turtleParser = new TurtleContentParser<TurtleContentParams>(in)
                     .setBaseIRI(IRI.create("http://example/base/"));
             turtleParser.setRdfContentBuilderProvider(RdfContentFactory::turtleBuilder);
             turtleParser.setRdfContentBuilderHandler(b -> {
diff --git a/content-rdf/src/test/java/org/xbib/content/rdf/io/turtle/TurtleTest.java b/content-rdf/src/test/java/org/xbib/content/rdf/io/turtle/TurtleTest.java
index 5dfb28d..4295ea2 100644
--- a/content-rdf/src/test/java/org/xbib/content/rdf/io/turtle/TurtleTest.java
+++ b/content-rdf/src/test/java/org/xbib/content/rdf/io/turtle/TurtleTest.java
@@ -29,7 +29,7 @@ public class TurtleTest extends StreamTester {
         IRINamespaceContext context = IRINamespaceContext.newInstance();
         context.addNamespace("gnd", "http://d-nb.info/gnd/");
         InputStream in = getClass().getResourceAsStream("GND.ttl");
-        TurtleContentParser reader = new TurtleContentParser(in)
+        TurtleContentParser<TurtleContentParams> reader = new TurtleContentParser<TurtleContentParams>(in)
                 .setBaseIRI(IRI.create("http://d-nb.info/gnd/"))
                 .context(context);
         reader.parse();
@@ -40,7 +40,7 @@ public class TurtleTest extends StreamTester {
     public void testTurtleGND2() throws Exception {
         IRINamespaceContext context = IRINamespaceContext.newInstance();
         InputStream in = getClass().getResourceAsStream("gnd2.ttl");
-        TurtleContentParser reader = new TurtleContentParser(in)
+        TurtleContentParser<TurtleContentParams> reader = new TurtleContentParser<TurtleContentParams>(in)
                 .setBaseIRI(IRI.create("http://d-nb.info/gnd/"))
                 .context(context);
         reader.parse();
@@ -51,7 +51,7 @@ public class TurtleTest extends StreamTester {
     public void testTurtleGND3() throws Exception {
         IRINamespaceContext context = IRINamespaceContext.newInstance();
         InputStream in = getClass().getResourceAsStream("gnd2.ttl");
-        TurtleContentParser reader = new TurtleContentParser(in)
+        TurtleContentParser<TurtleContentParams> reader = new TurtleContentParser<TurtleContentParams>(in)
                 .setBaseIRI(IRI.create("http://d-nb.info/gnd/"))
                 .context(context);
         reader.setRdfContentBuilderProvider(RdfContentFactory::turtleBuilder);
diff --git a/content-rdf/src/test/java/org/xbib/content/rdf/util/MultiMapTest.java b/content-rdf/src/test/java/org/xbib/content/rdf/util/MultiMapTest.java
index a6a6af0..249ed57 100644
--- a/content-rdf/src/test/java/org/xbib/content/rdf/util/MultiMapTest.java
+++ b/content-rdf/src/test/java/org/xbib/content/rdf/util/MultiMapTest.java
@@ -1,12 +1,12 @@
 package org.xbib.content.rdf.util;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
 import org.junit.Test;
 
 import java.util.Arrays;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
-
 /**
  *
  */
@@ -14,7 +14,7 @@ public class MultiMapTest {
 
     @Test
     public void testLinkedHashMultiMap() {
-        LinkedHashMultiMap<String,String> map = new LinkedHashMultiMap<>();
+        LinkedHashMultiMap<String, String> map = new LinkedHashMultiMap<>();
         map.put("a", "b");
         map.put("b", "c");
         map.put("a", "c");
@@ -28,7 +28,7 @@ public class MultiMapTest {
 
     @Test
     public void testTreeMultiMap() {
-        TreeMultiMap<String,String> map = new TreeMultiMap<>();
+        TreeMultiMap<String, String> map = new TreeMultiMap<>();
         map.put("a", "b");
         map.put("b", "c");
         map.put("a", "c");