diff --git a/oaipmh-core/src/main/java/info/textgrid/middleware/OAIPMHUtilities.java b/oaipmh-core/src/main/java/info/textgrid/middleware/OAIPMHUtilities.java
index d5b7b2d9df6cc87f8f1de486e60ab5e4e3d35e30..2419b382acf8c3206c235067ad639f1fe4298122 100644
--- a/oaipmh-core/src/main/java/info/textgrid/middleware/OAIPMHUtilities.java
+++ b/oaipmh-core/src/main/java/info/textgrid/middleware/OAIPMHUtilities.java
@@ -82,7 +82,7 @@ public class OAIPMHUtilities {
 
   public static final String IDIOM_IMAGE_NAMESPACE = "http://www.loc.gov/METS/";
   public static final String IDIOM_IMAGE_SCHEMA_LOCATION =
-          "http://www.loc.gov/standards/mets/mets.xsd";
+      "http://www.loc.gov/standards/mets/mets.xsd";
 
   public static final String DATACITE_PREFIX = "datacite";
   public static final String DATACITE_NAMESPACE = "http://datacite.org/schema/kernel-3";
@@ -287,7 +287,7 @@ public class OAIPMHUtilities {
       ResumptionTokenType resTokenForResponse = new ResumptionTokenType();
 
       if (resumptionToken != null && cursorCollector.containsKey(resumptionToken)) {
-        
+
         cursor = cursorCollector.get(resumptionToken).intValue() + i;
         if (cursor == searchResponseSize) {
           // TODO Why not "cursor += searchResponseSize;" ??
@@ -605,16 +605,21 @@ public class OAIPMHUtilities {
       final String identifier, final String setSpec) {
 
     HeaderType result = new HeaderType();
-        //identifier.substring(0, identifier.indexOf("."));
-    if(identifier.contains(".")){
+
+    log.info("Header identifier: " + identifier);
+
+    // identifier.substring(0, identifier.indexOf("."));
+    if (identifier.contains(".")) {
       result.setIdentifier(identifier.substring(0, identifier.indexOf(".")));
-    }else{
+    } else {
       result.setIdentifier(identifier);
     }
-    
+
+    log.info("Header identifier: " + identifier);
+
     result.setDatestamp(dateOfCreation);
 
-    log.debug(
+    log.info(
         "Header (DoC / ID / setSpec): " + dateOfCreation + " / " + identifier + " / " + setSpec);
 
     if (setSpec != null && !setSpec.isEmpty()) {
diff --git a/oaipmh-core/src/main/java/info/textgrid/middleware/RecordListDelivererDC.java b/oaipmh-core/src/main/java/info/textgrid/middleware/RecordListDelivererDC.java
index 8b4fe75f878c4eb01f1c732a7c42ed45328a58a2..9c59011fbb1be72e093b358a6e4525561e8cbdb8 100644
--- a/oaipmh-core/src/main/java/info/textgrid/middleware/RecordListDelivererDC.java
+++ b/oaipmh-core/src/main/java/info/textgrid/middleware/RecordListDelivererDC.java
@@ -236,9 +236,6 @@ public class RecordListDelivererDC extends RecordListDelivererAbstract {
 
             // Get identifier and setSpec field, add setSpec prefix if not already set.
             String identifier = OAIPMHUtilities.fieldLoader(json, this.identifierField);
-
-            System.out.println("id=" + identifier);
-
             String setSpec = OAIPMHUtilities.getSetSpec(set, this.specFieldPrefix, identifier);
 
             try {
diff --git a/pom.xml b/pom.xml
index 81850ae86a402423b81c46defa5f566e2ee03f1f..7aeb74ecd18ae7e92e069f9e48b119273a2881bc 100644
--- a/pom.xml
+++ b/pom.xml
@@ -10,28 +10,27 @@
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<cxf.version>3.3.11</cxf.version>
-        <jdk.version>1.8</jdk.version>
-        <antlr-maven-plugin.version>3.2</antlr-maven-plugin.version>
-        <antlr-runtime.version>3.2</antlr-runtime.version>
-        <common.version>4.2.0-SNAPSHOT</common.version>
-				<cxf.version>3.3.12</cxf.version>
-        <elasticsearch.version>6.5.4</elasticsearch.version>
-        <jaxb2-namespace-prefix.version>1.3</jaxb2-namespace-prefix.version>
-        <jetty-maven-plugin.version>9.4.12.v20180830</jetty-maven-plugin.version>
-				<junit.version>4.13.1</junit.version>
-        <json.version>20190722</json.version>
-        <maven-antrun-plugin.version>1.3</maven-antrun-plugin.version>
-        <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
-        <maven-deploy-plugin.version>2.8.2</maven-deploy-plugin.version>
-        <maven-eclipse-plugin.version>2.10</maven-eclipse-plugin.version>
-        <maven-jaxb2-plugin.version>0.14.0</maven-jaxb2-plugin.version>
-        <mets-mods-mapping.version>1.1.39</mets-mods-mapping.version>
-        <package-info-maven-plugin.version>1.4.5</package-info-maven-plugin.version>
-        <properties-maven-plugin.version>1.0-alpha-2</properties-maven-plugin.version>
-        <!-- <slf4j.version>1.7.5</slf4j.version> -->
-        <rdf4j-repository-api.version>3.0.2</rdf4j-repository-api.version>
-				<spring.version>4.0.2.RELEASE</spring.version>
-        <xstream.version>1.4.18</xstream.version>
+    <jdk.version>1.8</jdk.version>
+    <antlr-maven-plugin.version>3.2</antlr-maven-plugin.version>
+    <antlr-runtime.version>3.2</antlr-runtime.version>
+    <common.version>4.2.0-SNAPSHOT</common.version>
+		<cxf.version>3.3.12</cxf.version>
+    <elasticsearch.version>6.5.4</elasticsearch.version>
+    <jaxb2-namespace-prefix.version>1.3</jaxb2-namespace-prefix.version>
+    <jetty-maven-plugin.version>9.4.12.v20180830</jetty-maven-plugin.version>
+		<junit.version>4.13.1</junit.version>
+    <json.version>20190722</json.version>
+    <maven-antrun-plugin.version>1.3</maven-antrun-plugin.version>
+    <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
+    <maven-deploy-plugin.version>2.8.2</maven-deploy-plugin.version>
+    <maven-eclipse-plugin.version>2.10</maven-eclipse-plugin.version>
+    <maven-jaxb2-plugin.version>0.14.0</maven-jaxb2-plugin.version>
+    <mets-mods-mapping.version>1.1.39</mets-mods-mapping.version>
+    <package-info-maven-plugin.version>1.4.5</package-info-maven-plugin.version>
+    <properties-maven-plugin.version>1.0-alpha-2</properties-maven-plugin.version>
+    <rdf4j-repository-api.version>3.0.2</rdf4j-repository-api.version>
+		<spring.version>4.0.2.RELEASE</spring.version>
+    <xstream.version>1.4.18</xstream.version>
 	</properties>
 	<url>https://gitlab.gwdg.de/dariah-de/dariah-de-oai-pmh-services</url>
 	<scm>