diff --git a/build.gradle b/build.gradle
index 5519727..6b5783b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,7 +5,7 @@ plugins {
     id "org.xbib.gradle.plugin.asciidoctor" version "1.5.6.0.1"
 }
 
-printf "Host: %s\nOS: %s %s %s\nJVM: %s %s %s %s\nGroovy: %s\nGradle: %s\n" +
+printf "Host: %s\nOS: %s %s %s\nJVM: %s %s %s %s\n\nGradle: %s Groovy: %s Java: %s\n" +
         "Build: group: ${project.group} name: ${project.name} version: ${project.version}\n",
         InetAddress.getLocalHost(),
         System.getProperty("os.name"),
@@ -15,8 +15,9 @@ printf "Host: %s\nOS: %s %s %s\nJVM: %s %s %s %s\nGroovy: %s\nGradle: %s\n" +
         System.getProperty("java.vm.version"),
         System.getProperty("java.vm.vendor"),
         System.getProperty("java.vm.name"),
+        gradle.gradleVersion,
         GroovySystem.getVersion(),
-        gradle.gradleVersion
+        JavaVersion.current()
 
 apply plugin: 'build-dashboard'
 apply plugin: "io.codearte.nexus-staging"
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 7f8998b..55e7c80 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
@@ -28,12 +28,12 @@ public class RdfXContent implements RdfContent<RdfXContentParams> {
     }
 
     @Override
-    public RdfContentGenerator<RdfXContentParams> createGenerator(OutputStream out) throws IOException {
+    public RdfContentGenerator<RdfXContentParams> createGenerator(OutputStream out) {
         return new RdfXContentGenerator<>(out);
     }
 
     @Override
-    public RdfContentParser<RdfXContentParams> createParser(InputStream in) throws IOException {
+    public RdfContentParser<RdfXContentParams> createParser(InputStream in) {
         throw new UnsupportedOperationException();
     }
 }
diff --git a/content-rdf/src/main/java/org/xbib/content/rdf/RdfXContentGenerator.java b/content-rdf/src/main/java/org/xbib/content/rdf/RdfXContentGenerator.java
index b54cc1e..6ff86f9 100644
--- a/content-rdf/src/main/java/org/xbib/content/rdf/RdfXContentGenerator.java
+++ b/content-rdf/src/main/java/org/xbib/content/rdf/RdfXContentGenerator.java
@@ -19,12 +19,16 @@ import java.util.List;
 public class RdfXContentGenerator<P extends RdfXContentParams> implements RdfContentGenerator<P> {
 
     protected final OutputStream out;
+
     protected Resource resource;
+
     protected XContentBuilder builder;
+
     private P params;
+
     private boolean flushed;
 
-    RdfXContentGenerator(OutputStream out) throws IOException {
+    RdfXContentGenerator(OutputStream out) {
         this.out = out;
     }
 
@@ -112,14 +116,14 @@ public class RdfXContentGenerator<P extends RdfXContentParams> implements RdfCon
         return this;
     }
 
-    public String string() throws IOException {
+    public String string() {
         if (builder != null) {
             return builder.string();
         }
         return null;
     }
 
-    public String get() throws IOException {
+    public String get() {
         return string();
     }
 
diff --git a/content-rdf/src/main/java/org/xbib/content/rdf/io/xml/XmlContentGenerator.java b/content-rdf/src/main/java/org/xbib/content/rdf/io/xml/XmlContentGenerator.java
index a03f456..d33c1db 100644
--- a/content-rdf/src/main/java/org/xbib/content/rdf/io/xml/XmlContentGenerator.java
+++ b/content-rdf/src/main/java/org/xbib/content/rdf/io/xml/XmlContentGenerator.java
@@ -29,17 +29,20 @@ import javax.xml.stream.util.XMLEventConsumer;
 public class XmlContentGenerator implements RdfContentGenerator<XmlContentParams>, Flushable, XmlConstants {
 
     private static final XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();
+
     private static final XMLEventFactory eventFactory = XMLEventFactory.newInstance();
+
     private final Writer writer;
+
     private Resource resource;
 
     private XmlContentParams params = XmlContentParams.XML_CONTENT_PARAMS;
 
-    public XmlContentGenerator(OutputStream out) throws IOException {
+    public XmlContentGenerator(OutputStream out) {
         this(new OutputStreamWriter(out, StandardCharsets.UTF_8));
     }
 
-    public XmlContentGenerator(Writer writer) throws IOException {
+    public XmlContentGenerator(Writer writer) {
         this.writer = writer;
     }