diff --git a/jollyday-jaxb/src/main/java/de/focus_shift/jollyday/jaxb/JaxbConfigurationService.java b/jollyday-jaxb/src/main/java/de/focus_shift/jollyday/jaxb/JaxbConfigurationService.java
index 157b69d7a..048200dcb 100644
--- a/jollyday-jaxb/src/main/java/de/focus_shift/jollyday/jaxb/JaxbConfigurationService.java
+++ b/jollyday-jaxb/src/main/java/de/focus_shift/jollyday/jaxb/JaxbConfigurationService.java
@@ -10,7 +10,7 @@
 
 public class JaxbConfigurationService implements ConfigurationService {
 
-  private final XMLUtil xmlUtil = new XMLUtil();
+  private static final XMLUtil xmlUtil = new XMLUtil();
 
   @Override
   public Configuration getConfiguration(ManagerParameter parameter) {
diff --git a/jollyday-jaxb/src/main/java/de/focus_shift/jollyday/jaxb/XMLUtil.java b/jollyday-jaxb/src/main/java/de/focus_shift/jollyday/jaxb/XMLUtil.java
index 9ee20dde9..01f8d8192 100644
--- a/jollyday-jaxb/src/main/java/de/focus_shift/jollyday/jaxb/XMLUtil.java
+++ b/jollyday-jaxb/src/main/java/de/focus_shift/jollyday/jaxb/XMLUtil.java
@@ -24,7 +24,8 @@ public class XMLUtil {
 
   private static final Logger LOG = LoggerFactory.getLogger(XMLUtil.class);
 
-  private JAXBContextCreator contextCreator = new JAXBContextCreator();
+  private static JAXBContextCreator contextCreator = new JAXBContextCreator();
+  private static final JAXBContext jaxbContext = createJAXBContext(contextCreator);
 
   /**
    * Unmarshalls the configuration from the stream. Uses <code>JAXB</code> for
@@ -39,8 +40,7 @@ public Configuration unmarshallConfiguration(InputStream stream) {
     }
 
     try {
-      final JAXBContext ctx = createJAXBContext();
-      final Unmarshaller um = ctx.createUnmarshaller();
+      final Unmarshaller um = jaxbContext.createUnmarshaller();
       @SuppressWarnings("unchecked") final JAXBElement<Configuration> jaxbElement = (JAXBElement<Configuration>) um.unmarshal(stream);
       return jaxbElement.getValue();
     } catch (JAXBException exception) {
@@ -48,20 +48,6 @@ public Configuration unmarshallConfiguration(InputStream stream) {
     }
   }
 
-  private JAXBContext createJAXBContext() throws JAXBException {
-    JAXBContext ctx = null;
-    try {
-      ctx = contextCreator.create(XMLUtil.PACKAGE, ClassLoadingUtil.getClassloader());
-    } catch (JAXBException e) {
-      LOG.warn("Could not create JAXB context using the current threads context classloader. Falling back to ObjectFactory class classloader.");
-    }
-
-    if (ctx == null) {
-      ctx = contextCreator.create(XMLUtil.PACKAGE, ObjectFactory.class.getClassLoader());
-    }
-    return ctx;
-  }
-
   /**
    * Returns the {@link DayOfWeek} equivalent for the given weekday.
    *
@@ -87,4 +73,23 @@ public JAXBContext create(String packageName, ClassLoader classLoader) throws JA
       return JAXBContext.newInstance(packageName, classLoader);
     }
   }
+
+  private static JAXBContext createJAXBContext(final JAXBContextCreator contextCreator) {
+    JAXBContext ctx = null;
+    try {
+      ctx = contextCreator.create(XMLUtil.PACKAGE, ClassLoadingUtil.getClassloader());
+    } catch (JAXBException e) {
+      LOG.warn("Could not create JAXB context using the current classloader from ClassLoadingUtil. Falling back to ObjectFactory class classloader.");
+    }
+
+    if (ctx == null) {
+      try {
+        ctx = contextCreator.create(XMLUtil.PACKAGE, ObjectFactory.class.getClassLoader());
+      } catch (JAXBException exception) {
+        throw new IllegalStateException("Could not create JAXB context using ObjectFactory classloader.", exception);
+      }
+    }
+
+    return ctx;
+  }
 }
diff --git a/jollyday-jaxb/src/test/java/de/focus_shift/jollyday/jaxb/test/XMLUtilTest.java b/jollyday-jaxb/src/test/java/de/focus_shift/jollyday/jaxb/test/XMLUtilTest.java
index 978802a7d..ac587e78d 100644
--- a/jollyday-jaxb/src/test/java/de/focus_shift/jollyday/jaxb/test/XMLUtilTest.java
+++ b/jollyday-jaxb/src/test/java/de/focus_shift/jollyday/jaxb/test/XMLUtilTest.java
@@ -41,9 +41,9 @@ void testUnmarshallConfigurationNullCheck() {
 
   @Test
   void testUnmarshallConfigurationException() throws IOException, JAXBException {
-    when(contextCreator.create(eq("de.focus_shift.jollyday.jaxb.mapping"), any(ClassLoader.class))).thenThrow(new JAXBException("")).thenThrow(new JAXBException(""));
+    when(contextCreator.create(eq("de.focus_shift.jollyday.jaxb.mapping"), any(ClassLoader.class))).thenThrow(new JAXBException(""));
     assertThatThrownBy(() -> xmlUtil.unmarshallConfiguration(inputStream)).isInstanceOf(IllegalStateException.class);
-    verify(inputStream, never()).close();
+    verify(inputStream).close();
   }
 
   @Test
@@ -51,7 +51,7 @@ void testUnmarshallConfiguration() throws JAXBException {
     final JAXBContext ctx = mock(JAXBContext.class);
     final Unmarshaller unmarshaller = mock(Unmarshaller.class);
     @SuppressWarnings("unchecked") final JAXBElement<Configuration> element = mock(JAXBElement.class);
-    when(contextCreator.create(eq("de.focus_shift.jollyday.jaxb.mapping"), any(ClassLoader.class))).thenReturn(null).thenReturn(ctx);
+    when(contextCreator.create(eq("de.focus_shift.jollyday.jaxb.mapping"), any(ClassLoader.class))).thenReturn(ctx);
     when(ctx.createUnmarshaller()).thenReturn(unmarshaller);
     when(unmarshaller.unmarshal(inputStream)).thenReturn(element);
     xmlUtil.unmarshallConfiguration(inputStream);