diff --git a/Kieker.WebGUI/src/main/java/kieker/webgui/domain/Role.java b/Kieker.WebGUI/src/main/java/kieker/webgui/domain/Role.java
index b5efd3adaeb27a5b662197d94b116ed45dd43040..3a67670d423770575bbeaebc211f610478b06db5 100644
--- a/Kieker.WebGUI/src/main/java/kieker/webgui/domain/Role.java
+++ b/Kieker.WebGUI/src/main/java/kieker/webgui/domain/Role.java
@@ -24,11 +24,11 @@ package kieker.webgui.domain;
 public enum Role {
 
 	/** Represents a guest within the system. */
-	ROLE_GUEST(0),
+	GUEST(0),
 	/** Represents an user within the system. */
-	ROLE_USER(1),
+	USER(1),
 	/** Represents an administrator within the system. */
-	ROLE_ADMIN(2);
+	ADMINISTRATOR(2);
 
 	private int id;
 
diff --git a/Kieker.WebGUI/src/main/java/kieker/webgui/persistence/impl/DerbyUserDAOImpl.java b/Kieker.WebGUI/src/main/java/kieker/webgui/persistence/impl/DerbyUserDAOImpl.java
index ad968f9a9b0746e45919af8f98649c3f537b6d96..040107fda21ab946c1d2a31c197a11f7e5b221e6 100644
--- a/Kieker.WebGUI/src/main/java/kieker/webgui/persistence/impl/DerbyUserDAOImpl.java
+++ b/Kieker.WebGUI/src/main/java/kieker/webgui/persistence/impl/DerbyUserDAOImpl.java
@@ -39,7 +39,7 @@ import org.springframework.transaction.annotation.Transactional;
 
 /**
  * An implementation of the {@link IUserDAO} interface, which uses Apache Derby to store and manage the available users. A transaction manager makes sure that all
- * operations are atomically.
+ * operations are atomically. The connection to the data base and the actual data source are managed by the Spring framework.
  * 
  * @author Nils Christian Ehmke
  */
@@ -70,9 +70,9 @@ public class DerbyUserDAOImpl implements IUserDAO {
 			// Use all properties of the given object
 			statement.setString(1, user.getName());
 			statement.setString(2, user.getPassword());
-			statement.setBoolean(3, user.getRole() == Role.ROLE_GUEST);
-			statement.setBoolean(4, user.getRole() == Role.ROLE_USER);
-			statement.setBoolean(5, user.getRole() == Role.ROLE_ADMIN);
+			statement.setBoolean(3, user.getRole() == Role.GUEST);
+			statement.setBoolean(4, user.getRole() == Role.USER);
+			statement.setBoolean(5, user.getRole() == Role.ADMINISTRATOR);
 			statement.setBoolean(6, user.isEnabled());
 
 			statement.execute();
@@ -85,7 +85,7 @@ public class DerbyUserDAOImpl implements IUserDAO {
 				try {
 					statement.close();
 				} catch (final SQLException ex) {
-					DerbyUserDAOImpl.LOG.error("Could not close prepared statement.", ex);
+					LOG.error("Could not close prepared statement.", ex);
 				}
 			}
 		}
@@ -112,7 +112,7 @@ public class DerbyUserDAOImpl implements IUserDAO {
 				try {
 					statement.close();
 				} catch (final SQLException ex) {
-					DerbyUserDAOImpl.LOG.error("Could not close prepared statement.", ex);
+					LOG.error("Could not close prepared statement.", ex);
 				}
 			}
 		}
@@ -138,21 +138,21 @@ public class DerbyUserDAOImpl implements IUserDAO {
 
 			// Set the other values
 			statement.setString(1, user.getName());
-			statement.setBoolean(2, user.getRole() == Role.ROLE_GUEST);
-			statement.setBoolean(3, user.getRole() == Role.ROLE_USER);
-			statement.setBoolean(4, user.getRole() == Role.ROLE_ADMIN);
+			statement.setBoolean(2, user.getRole() == Role.GUEST);
+			statement.setBoolean(3, user.getRole() == Role.USER);
+			statement.setBoolean(4, user.getRole() == Role.ADMINISTRATOR);
 			statement.setBoolean(5, user.isEnabled());
 
 			statement.execute();
 		} catch (final SQLException ex) {
-			throw new DataAccessException("Could not update user within the database.", ex);
+			throw new DataAccessException("Could not edit user within the database.", ex);
 		} finally {
 			// Try to close the statement. If this is not possible then log the problem. It is not necessary to inform the calling method about a fail though.
 			if (statement != null) {
 				try {
 					statement.close();
 				} catch (final SQLException ex) {
-					DerbyUserDAOImpl.LOG.error("Could not close prepared statement.", ex);
+					LOG.error("Could not close prepared statement.", ex);
 				}
 			}
 		}
@@ -172,23 +172,24 @@ public class DerbyUserDAOImpl implements IUserDAO {
 			statement = connection.prepareStatement("SELECT name, isGuest, isUser, isAdministrator, isEnabled FROM Users");
 
 			queryResult = statement.executeQuery();
+
 			DerbyUserDAOImpl.queryToUsers(queryResult, result);
 		} catch (final SQLException ex) {
-			DerbyUserDAOImpl.LOG.error("Could not receive user list.", ex);
+			LOG.error("Could not receive user list.", ex);
 		} finally {
 			// Try to close everything. If this is not possible then log the problem. It is not necessary to inform the calling method about a fail though.
 			if (queryResult != null) {
 				try {
 					queryResult.close();
 				} catch (final SQLException ex) {
-					DerbyUserDAOImpl.LOG.error("Could not close query result.", ex);
+					LOG.error("Could not close query result.", ex);
 				}
 			}
 			if (statement != null) {
 				try {
 					statement.close();
 				} catch (final SQLException ex) {
-					DerbyUserDAOImpl.LOG.error("Could not close prepared statement.", ex);
+					LOG.error("Could not close prepared statement.", ex);
 				}
 			}
 		}
@@ -208,11 +209,11 @@ public class DerbyUserDAOImpl implements IUserDAO {
 			// The case that the user has no role cannot happen, as the database should make sure that this is not possible
 			final Role role;
 			if (isAdministrator) {
-				role = Role.ROLE_ADMIN;
+				role = Role.ADMINISTRATOR;
 			} else if (isUser) {
-				role = Role.ROLE_USER;
+				role = Role.USER;
 			} else if (isGuest) {
-				role = Role.ROLE_GUEST;
+				role = Role.GUEST;
 			} else {
 				role = null;
 			}
diff --git a/Kieker.WebGUI/src/main/java/kieker/webgui/service/impl/utility/Analysis.java b/Kieker.WebGUI/src/main/java/kieker/webgui/service/impl/utility/Analysis.java
index 919e3ae2ccb2023cc98ead31315f59ba8301bcb9..6674b554e3c98b84dda695e453a6ca43c8446069 100644
--- a/Kieker.WebGUI/src/main/java/kieker/webgui/service/impl/utility/Analysis.java
+++ b/Kieker.WebGUI/src/main/java/kieker/webgui/service/impl/utility/Analysis.java
@@ -78,6 +78,7 @@ public class Analysis {
 					.withArgs(modelProject, classLoader);
 
 			this.analysisController = new Mirror().on(controllerAndMapping).invoke().method("getController").withoutArgs();
+
 			this.analysisControllerThread = new Mirror().on(analsisControllerThreadClass).invoke().constructor().withArgs(this.analysisController);
 
 			final Map<Object, Object> pluginMap = (Map<Object, Object>) new Mirror().on(controllerAndMapping).invoke().method("getPluginMap").withoutArgs();
diff --git a/Kieker.WebGUI/src/main/java/kieker/webgui/web/beans/request/NewUserBean.java b/Kieker.WebGUI/src/main/java/kieker/webgui/web/beans/request/NewUserBean.java
index 64705bd1d7c69e273f9b1ff25a1a88aa6e5be33f..6e544819d609408f08d138c9d69f4afdf6866563 100644
--- a/Kieker.WebGUI/src/main/java/kieker/webgui/web/beans/request/NewUserBean.java
+++ b/Kieker.WebGUI/src/main/java/kieker/webgui/web/beans/request/NewUserBean.java
@@ -40,7 +40,7 @@ public class NewUserBean {
 	 * Creates a new instance of this bean and initializes it with empty fields. <b>Do not use this constructor. This bean is Spring managed.</b>
 	 */
 	public NewUserBean() {
-		this.role = Role.ROLE_GUEST;
+		this.role = Role.GUEST;
 		this.username = "";
 		this.password = "";
 		this.active = false;
diff --git a/Kieker.WebGUI/src/main/java/kieker/webgui/web/beans/view/CurrentCockpitBean.java b/Kieker.WebGUI/src/main/java/kieker/webgui/web/beans/view/CurrentCockpitBean.java
index 5ea90eafb744044bd0ce1ff437abb7a42d0ef134..4fe344eff9fe821a8693763faad0aed46e8ecb85 100644
--- a/Kieker.WebGUI/src/main/java/kieker/webgui/web/beans/view/CurrentCockpitBean.java
+++ b/Kieker.WebGUI/src/main/java/kieker/webgui/web/beans/view/CurrentCockpitBean.java
@@ -437,18 +437,19 @@ public class CurrentCockpitBean {
 	private void updateMeterGaugeDisplay(final UIComponent component, final String displayConnectorName) {
 		final boolean isAlreadyCorrectlyInitialized = (component.getChildCount() == 1) && (component.getChildren().get(0) instanceof MeterGaugeChart);
 
+		final MeterGaugeChart meterGaugeChart;
 		final MeterGaugeChartModel meterGaugeChartModel;
 
 		// Avoid unnecessary component creation. Use the existing components if they are already existing and from the correct type.
 		if (isAlreadyCorrectlyInitialized) {
-			final MeterGaugeChart meterGaugeChart = (MeterGaugeChart) component.getChildren().get(0);
+			meterGaugeChart = (MeterGaugeChart) component.getChildren().get(0);
 			meterGaugeChartModel = meterGaugeChart.getValue();
 		} else {
 			final FacesContext facesContext = FacesContext.getCurrentInstance();
 			final Application application = facesContext.getApplication();
 
 			// Create the Primefaces chart component
-			final MeterGaugeChart meterGaugeChart = (MeterGaugeChart) application.createComponent(facesContext, "org.primefaces.component.chart.MeterGaugeChart",
+			meterGaugeChart = (MeterGaugeChart) application.createComponent(facesContext, "org.primefaces.component.chart.MeterGaugeChart",
 					"org.primefaces.component.chart.MeterGaugeChartRenderer");
 			meterGaugeChart.setTitle(displayConnectorName);
 
@@ -467,10 +468,12 @@ public class CurrentCockpitBean {
 			final Number value = (Number) new Mirror().on(displayObj).invoke().method("getValue").withoutArgs();
 
 			if (intervals.isEmpty()) {
-				meterGaugeChartModel.setIntervals(Arrays.asList((Number) 50, 100));
+				meterGaugeChartModel.setIntervals(Arrays.asList((Number) 50));
 				meterGaugeChartModel.setValue(0);
 			} else {
 				meterGaugeChartModel.setIntervals(intervals);
+				meterGaugeChart.setShadow(true);
+				meterGaugeChart.setSeriesColors("66cc66, 93b75f, E7E658, cc6666");
 				final Number maxInterval = intervals.get(intervals.size() - 1);
 				if (value.doubleValue() <= maxInterval.doubleValue()) {
 					meterGaugeChartModel.setValue(value);
diff --git a/Kieker.WebGUI/src/main/java/kieker/webgui/web/beans/view/CurrentUserManagementBean.java b/Kieker.WebGUI/src/main/java/kieker/webgui/web/beans/view/CurrentUserManagementBean.java
index d2d1b5f67aa74bccc9451b59fc21f93538915d20..f42d93f8a5d9ce0b9d117999ff1ca1c3af02afdb 100644
--- a/Kieker.WebGUI/src/main/java/kieker/webgui/web/beans/view/CurrentUserManagementBean.java
+++ b/Kieker.WebGUI/src/main/java/kieker/webgui/web/beans/view/CurrentUserManagementBean.java
@@ -89,7 +89,7 @@ public class CurrentUserManagementBean {
 			this.availableUsers.add(user);
 			GlobalPropertiesBean.showMessage(FacesMessage.SEVERITY_INFO, "Added user to the database.");
 		} catch (final DataAccessException ex) {
-			CurrentUserManagementBean.LOG.error("Could not add the user to the database.", ex);
+			LOG.error("Could not add the user to the database.", ex);
 			GlobalPropertiesBean.showMessage(FacesMessage.SEVERITY_ERROR, "Could not add the user to the database.");
 		}
 	}
@@ -103,7 +103,7 @@ public class CurrentUserManagementBean {
 			this.availableUsers.remove(this.selectedUser);
 			GlobalPropertiesBean.showMessage(FacesMessage.SEVERITY_INFO, "Deleted user from the database.");
 		} catch (final DataAccessException ex) {
-			CurrentUserManagementBean.LOG.error("Could not delete the user from the database.", ex);
+			LOG.error("Could not delete the user from the database.", ex);
 			GlobalPropertiesBean.showMessage(FacesMessage.SEVERITY_ERROR, "Could not delete the user from the database.");
 		}
 	}
@@ -121,7 +121,7 @@ public class CurrentUserManagementBean {
 
 			GlobalPropertiesBean.showMessage(FacesMessage.SEVERITY_INFO, "Modified user within the database.");
 		} catch (final DataAccessException ex) {
-			CurrentUserManagementBean.LOG.error("Could not modify the user within the database.", ex);
+			LOG.error("Could not modify the user within the database.", ex);
 			GlobalPropertiesBean.showMessage(FacesMessage.SEVERITY_ERROR, "Could not modify the user within the database.");
 		}
 	}
@@ -137,7 +137,7 @@ public class CurrentUserManagementBean {
 
 			GlobalPropertiesBean.showMessage(FacesMessage.SEVERITY_INFO, "Modified user within the database.");
 		} catch (final DataAccessException ex) {
-			CurrentUserManagementBean.LOG.error("Could not modify the user within the database.", ex);
+			LOG.error("Could not modify the user within the database.", ex);
 			GlobalPropertiesBean.showMessage(FacesMessage.SEVERITY_ERROR, "Could not modify the user within the database.");
 		}
 	}
@@ -158,7 +158,7 @@ public class CurrentUserManagementBean {
 			this.availableUsers.set(this.availableUsers.indexOf(this.selectedUser), this.selectedUserCopy);
 			GlobalPropertiesBean.showMessage(FacesMessage.SEVERITY_INFO, "Modified user within the database.");
 		} catch (final DataAccessException ex) {
-			CurrentUserManagementBean.LOG.error("Could not modify the user within the database.", ex);
+			LOG.error("Could not modify the user within the database.", ex);
 			GlobalPropertiesBean.showMessage(FacesMessage.SEVERITY_ERROR, "Could not modify the user within the database.");
 		}
 	}
@@ -170,7 +170,7 @@ public class CurrentUserManagementBean {
 		try {
 			this.availableUsers = this.userService.getUsers();
 		} catch (final DataAccessException ex) {
-			CurrentUserManagementBean.LOG.error("An error occured while accessing the database.", ex);
+			LOG.error("An error occured while accessing the database.", ex);
 			GlobalPropertiesBean.showMessage(FacesMessage.SEVERITY_ERROR, "An error occured while accessing the database.");
 		}
 	}
diff --git a/Kieker.WebGUI/src/main/webapp/WEB-INF/spring-bean-config.xml b/Kieker.WebGUI/src/main/webapp/WEB-INF/spring-bean-config.xml
index 8a32fe3ffef5aa417a2ef5213a6d5caded976da7..03c9901bb0c62764d640e39107381d484de4a040 100644
--- a/Kieker.WebGUI/src/main/webapp/WEB-INF/spring-bean-config.xml
+++ b/Kieker.WebGUI/src/main/webapp/WEB-INF/spring-bean-config.xml
@@ -68,7 +68,7 @@
     <context:component-scan base-package="kieker.webgui"/> 
     
     <!-- Declare the necessary enumerations. -->
-    <util:constant id="ROLE_GUEST" static-field="kieker.webgui.domain.Role.ROLE_GUEST"/>
-    <util:constant id="ROLE_USER" static-field="kieker.webgui.domain.Role.ROLE_USER"/>
-    <util:constant id="ROLE_ADMIN" static-field="kieker.webgui.domain.Role.ROLE_ADMIN"/>
+    <util:constant id="ROLE_GUEST" static-field="kieker.webgui.domain.Role.GUEST"/>
+    <util:constant id="ROLE_USER" static-field="kieker.webgui.domain.Role.USER"/>
+    <util:constant id="ROLE_ADMIN" static-field="kieker.webgui.domain.Role.ADMINISTRATOR"/>
 </beans>
diff --git a/Kieker.WebGUI/src/main/webapp/WEB-INF/spring-kieker-config.xml b/Kieker.WebGUI/src/main/webapp/WEB-INF/spring-kieker-config.xml
index 3d0cd8f2cea629be44eddfdd0e38c81688dfb0c6..a222a6668cc44d7db60f14db8fb40b903a87c81e 100644
--- a/Kieker.WebGUI/src/main/webapp/WEB-INF/spring-kieker-config.xml
+++ b/Kieker.WebGUI/src/main/webapp/WEB-INF/spring-kieker-config.xml
@@ -8,10 +8,10 @@
        xmlns:context="http://www.springframework.org/schema/context">
 
     <!-- Kieker's instrumentation probes based on the Spring AOP interception framework -->
-   <!-- <bean id="opEMII" class="kieker.monitoring.probe.spring.executions.OperationExecutionMethodInvocationInterceptor" /> 
+    <!--  <bean id="opEMII" class="kieker.monitoring.probe.spring.executions.OperationExecutionMethodInvocationInterceptor" /> 
     <aop:config>
         <aop:advisor advice-ref="opEMII" pointcut="execution(public * kieker.webgui..*.*(..))"/>
     </aop:config>
     
-    <aop:aspectj-autoproxy proxy-target-class="true"/>-->
+    <aop:aspectj-autoproxy proxy-target-class="true"/> -->
 </beans>
diff --git a/Kieker.WebGUI/src/test/java/kieker/webgui/web/converter/RoleStringConverterTest.java b/Kieker.WebGUI/src/test/java/kieker/webgui/web/converter/RoleStringConverterTest.java
index fe46dd698b966da024b311df3aef8c5701f6e749..66fb9821b9c6c554677c6b897636f3f149f3a46e 100644
--- a/Kieker.WebGUI/src/test/java/kieker/webgui/web/converter/RoleStringConverterTest.java
+++ b/Kieker.WebGUI/src/test/java/kieker/webgui/web/converter/RoleStringConverterTest.java
@@ -44,9 +44,9 @@ public class RoleStringConverterTest {
 	public void testEqualAsString() {
 		final RoleStringConverter converter = new RoleStringConverter();
 
-		Assert.assertEquals("Conversion failed.", Role.ROLE_ADMIN.toString(), converter.getAsString(null, null, Role.ROLE_ADMIN));
-		Assert.assertEquals("Conversion failed.", Role.ROLE_GUEST.toString(), converter.getAsString(null, null, Role.ROLE_GUEST));
-		Assert.assertEquals("Conversion failed.", Role.ROLE_USER.toString(), converter.getAsString(null, null, Role.ROLE_USER));
+		Assert.assertEquals("Conversion failed.", Role.ADMINISTRATOR.toString(), converter.getAsString(null, null, Role.ADMINISTRATOR));
+		Assert.assertEquals("Conversion failed.", Role.GUEST.toString(), converter.getAsString(null, null, Role.GUEST));
+		Assert.assertEquals("Conversion failed.", Role.USER.toString(), converter.getAsString(null, null, Role.USER));
 	}
 
 	/**
@@ -56,9 +56,9 @@ public class RoleStringConverterTest {
 	public void testEqualFromString() {
 		final RoleStringConverter converter = new RoleStringConverter();
 
-		Assert.assertEquals("Conversion failed.", Role.ROLE_ADMIN, converter.getAsObject(null, null, Role.ROLE_ADMIN.toString()));
-		Assert.assertEquals("Conversion failed.", Role.ROLE_GUEST, converter.getAsObject(null, null, Role.ROLE_GUEST.toString()));
-		Assert.assertEquals("Conversion failed.", Role.ROLE_USER, converter.getAsObject(null, null, Role.ROLE_USER.toString()));
+		Assert.assertEquals("Conversion failed.", Role.ADMINISTRATOR, converter.getAsObject(null, null, Role.ADMINISTRATOR.toString()));
+		Assert.assertEquals("Conversion failed.", Role.GUEST, converter.getAsObject(null, null, Role.GUEST.toString()));
+		Assert.assertEquals("Conversion failed.", Role.USER, converter.getAsObject(null, null, Role.USER.toString()));
 	}
 
 	/**