diff --git a/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/InputField.java b/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/InputField.java
index 7c3e269a..3b6d8893 100644
--- a/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/InputField.java
+++ b/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/InputField.java
@@ -10,8 +10,6 @@ package ch.ethz.seb.sebserver.gui.service.examconfig;
 
 import java.util.Collection;
 
-import org.eclipse.swt.widgets.Control;
-
 import ch.ethz.seb.sebserver.gbl.model.sebconfig.ConfigurationAttribute;
 import ch.ethz.seb.sebserver.gbl.model.sebconfig.ConfigurationValue;
 import ch.ethz.seb.sebserver.gbl.model.sebconfig.Orientation;
@@ -24,8 +22,6 @@ public interface InputField {
 
     void initValue(Collection<ConfigurationValue> values);
 
-    Control getControl();
-
     void showError(String errorMessage);
 
     void clearError();
diff --git a/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/InputFieldBuilder.java b/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/InputFieldBuilder.java
index 74921bc5..d8c7a3ff 100644
--- a/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/InputFieldBuilder.java
+++ b/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/InputFieldBuilder.java
@@ -8,12 +8,17 @@
 
 package ch.ethz.seb.sebserver.gui.service.examconfig;
 
+import org.eclipse.rap.rwt.RWT;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.layout.GridData;
+import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Label;
 
 import ch.ethz.seb.sebserver.gbl.model.sebconfig.ConfigurationAttribute;
 import ch.ethz.seb.sebserver.gbl.model.sebconfig.Orientation;
 import ch.ethz.seb.sebserver.gui.service.examconfig.impl.ViewContext;
-import ch.ethz.seb.sebserver.gui.service.i18n.LocTextKey;
+import ch.ethz.seb.sebserver.gui.widget.WidgetFactory.CustomVariant;
 
 public interface InputFieldBuilder {
 
@@ -28,8 +33,31 @@ public interface InputFieldBuilder {
             final ConfigurationAttribute attribute,
             final ViewContext viewContext);
 
-    static LocTextKey createResourceBundleKey(final String paramName, final String value) {
-        return new LocTextKey(RES_BUNDLE_KEY_PREFIX + paramName + "." + value);
+    static Composite createInnerGrid(
+            final Composite parent,
+            final Orientation orientation) {
+
+        final Composite comp = new Composite(parent, SWT.NONE);
+        final GridLayout gridLayout = new GridLayout();
+        gridLayout.verticalSpacing = 0;
+        gridLayout.marginHeight = 1;
+        comp.setLayout(gridLayout);
+
+        final GridData gridData = new GridData(
+                SWT.FILL, SWT.FILL,
+                true, false,
+                (orientation != null) ? orientation.width() : 1,
+                (orientation != null) ? orientation.height() : 1);
+        comp.setLayoutData(gridData);
+        return comp;
+    }
+
+    static Label createErrorLabel(final Composite innerGrid) {
+        final Label errorLabel = new Label(innerGrid, SWT.NONE);
+        errorLabel.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
+        errorLabel.setVisible(false);
+        errorLabel.setData(RWT.CUSTOM_VARIANT, CustomVariant.ERROR.key);
+        return errorLabel;
     }
 
 }
diff --git a/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/ControlFieldAdapter.java b/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/AbstractInputField.java
similarity index 77%
rename from src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/ControlFieldAdapter.java
rename to src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/AbstractInputField.java
index e1c71960..04a36779 100644
--- a/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/ControlFieldAdapter.java
+++ b/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/AbstractInputField.java
@@ -18,14 +18,17 @@ import ch.ethz.seb.sebserver.gbl.model.sebconfig.ConfigurationValue;
 import ch.ethz.seb.sebserver.gbl.model.sebconfig.Orientation;
 import ch.ethz.seb.sebserver.gui.service.examconfig.InputField;
 
-public abstract class ControlFieldAdapter<T extends Control> implements InputField {
+public abstract class AbstractInputField<T extends Control> implements InputField {
 
     protected final ConfigurationAttribute attribute;
     protected final Orientation orientation;
     protected final T control;
     protected final Label errorLabel;
 
-    ControlFieldAdapter(
+    protected String initValue = "";
+    protected int listIndex = 0;
+
+    AbstractInputField(
             final ConfigurationAttribute attribute,
             final Orientation orientation,
             final T control,
@@ -42,11 +45,6 @@ public abstract class ControlFieldAdapter<T extends Control> implements InputFie
         return this.attribute;
     }
 
-    @Override
-    public final Control getControl() {
-        return this.control;
-    }
-
     @Override
     public void disable() {
         if (this.control.isEnabled()) {
@@ -89,7 +87,15 @@ public abstract class ControlFieldAdapter<T extends Control> implements InputFie
 
     @Override
     public void initValue(final Collection<ConfigurationValue> values) {
-        // Does Nothing for default
+        values.stream()
+                .filter(a -> this.attribute.id.equals(a.attributeId))
+                .findFirst()
+                .map(v -> {
+                    this.initValue = v.value;
+                    this.listIndex = (v.listIndex != null) ? v.listIndex : 0;
+                    setDefaultValue();
+                    return this.initValue;
+                });
     }
 
     protected abstract void setDefaultValue();
diff --git a/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/CheckBoxBuilder.java b/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/CheckBoxBuilder.java
index cd9b03d0..4e85ad46 100644
--- a/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/CheckBoxBuilder.java
+++ b/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/CheckBoxBuilder.java
@@ -8,7 +8,6 @@
 
 package ch.ethz.seb.sebserver.gui.service.examconfig.impl;
 
-import java.util.Collection;
 import java.util.Objects;
 
 import org.eclipse.swt.SWT;
@@ -19,7 +18,6 @@ import org.springframework.stereotype.Component;
 
 import ch.ethz.seb.sebserver.gbl.model.sebconfig.AttributeType;
 import ch.ethz.seb.sebserver.gbl.model.sebconfig.ConfigurationAttribute;
-import ch.ethz.seb.sebserver.gbl.model.sebconfig.ConfigurationValue;
 import ch.ethz.seb.sebserver.gbl.model.sebconfig.Orientation;
 import ch.ethz.seb.sebserver.gbl.profile.GuiProfile;
 import ch.ethz.seb.sebserver.gui.service.examconfig.InputField;
@@ -72,9 +70,7 @@ public class CheckBoxBuilder implements InputFieldBuilder {
                 checkbox);
     }
 
-    static final class CheckboxField extends ControlFieldAdapter<Button> {
-
-        private boolean initValue = false;
+    static final class CheckboxField extends AbstractInputField<Button> {
 
         CheckboxField(
                 final ConfigurationAttribute attribute,
@@ -84,21 +80,9 @@ public class CheckBoxBuilder implements InputFieldBuilder {
             super(attribute, orientation, control, null);
         }
 
-        @Override
-        public void initValue(final Collection<ConfigurationValue> values) {
-            values.stream()
-                    .filter(v -> this.attribute.id.equals(v.attributeId))
-                    .findFirst()
-                    .map(v -> {
-                        this.initValue = Boolean.valueOf(v.value);
-                        this.control.setSelection(this.initValue);
-                        return this.initValue;
-                    });
-        }
-
         @Override
         protected void setDefaultValue() {
-            this.control.setSelection(this.initValue);
+            this.control.setSelection(Boolean.valueOf(this.initValue));
         }
     }
 
diff --git a/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/ExamConfigurationServiceImpl.java b/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/ExamConfigurationServiceImpl.java
index daa13b5f..9259f40a 100644
--- a/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/ExamConfigurationServiceImpl.java
+++ b/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/ExamConfigurationServiceImpl.java
@@ -25,6 +25,8 @@ import org.springframework.stereotype.Service;
 
 import ch.ethz.seb.sebserver.gbl.Constants;
 import ch.ethz.seb.sebserver.gbl.api.API;
+import ch.ethz.seb.sebserver.gbl.api.APIMessage;
+import ch.ethz.seb.sebserver.gbl.api.APIMessage.ErrorMessage;
 import ch.ethz.seb.sebserver.gbl.api.JSONMapper;
 import ch.ethz.seb.sebserver.gbl.model.sebconfig.Configuration;
 import ch.ethz.seb.sebserver.gbl.model.sebconfig.ConfigurationAttribute;
@@ -39,7 +41,10 @@ import ch.ethz.seb.sebserver.gui.service.examconfig.ExamConfigurationService;
 import ch.ethz.seb.sebserver.gui.service.examconfig.InputFieldBuilder;
 import ch.ethz.seb.sebserver.gui.service.examconfig.ValueChangeListener;
 import ch.ethz.seb.sebserver.gui.service.examconfig.ValueChangeRule;
+import ch.ethz.seb.sebserver.gui.service.i18n.LocTextKey;
+import ch.ethz.seb.sebserver.gui.service.page.FieldValidationError;
 import ch.ethz.seb.sebserver.gui.service.page.PageContext;
+import ch.ethz.seb.sebserver.gui.service.remote.webservice.api.RestCallError;
 import ch.ethz.seb.sebserver.gui.service.remote.webservice.api.RestService;
 import ch.ethz.seb.sebserver.gui.service.remote.webservice.api.seb.examconfig.GetConfigAttributes;
 import ch.ethz.seb.sebserver.gui.service.remote.webservice.api.seb.examconfig.GetConfigurationValues;
@@ -162,9 +167,7 @@ public class ExamConfigurationServiceImpl implements ExamConfigurationService {
     public Composite createViewGrid(final Composite parent, final ViewContext viewContext) {
         final Composite composite = new Composite(parent, SWT.NONE);
         final GridLayout gridLayout = new GridLayout(viewContext.columns, true);
-        gridLayout.marginTop = 10;
-        gridLayout.verticalSpacing = 5;
-        gridLayout.horizontalSpacing = 10;
+        gridLayout.verticalSpacing = 0;
         composite.setLayout(gridLayout);
         composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 
@@ -208,6 +211,8 @@ public class ExamConfigurationServiceImpl implements ExamConfigurationService {
 
     private static final class ValueChangeListenerImpl implements ValueChangeListener {
 
+        public static final String VALIDATION_ERROR_KEY_PREFIX = "sebserver.examconfig.props.validation.";
+
         private final PageContext pageContext;
         private final RestService restService;
         private final JSONMapper jsonMapper;
@@ -267,8 +272,25 @@ public class ExamConfigurationServiceImpl implements ExamConfigurationService {
         }
 
         private String verifyErrorMessage(final Throwable error) {
-            // TODO Auto-generated method stub
-            return "TODO";
+            if (error instanceof RestCallError) {
+                final List<APIMessage> errorMessages = ((RestCallError) error).getErrorMessages();
+                if (errorMessages.isEmpty()) {
+                    return "";
+                }
+
+                final APIMessage apiMessage = errorMessages.get(0);
+                if (!ErrorMessage.FIELD_VALIDATION.isOf(apiMessage)) {
+                    return "";
+                }
+
+                final FieldValidationError fieldValidationError = new FieldValidationError(apiMessage);
+                return this.pageContext.getI18nSupport().getText(new LocTextKey(
+                        VALIDATION_ERROR_KEY_PREFIX + fieldValidationError.errorType,
+                        (Object[]) fieldValidationError.getAttributes()));
+            }
+
+            log.warn("Unexpected error happened while trying to set SEB configuration value: ", error);
+            return VALIDATION_ERROR_KEY_PREFIX + "unexpected";
         }
     }
 
diff --git a/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/LabelBuilder.java b/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/LabelBuilder.java
index f50d86f0..62d26d33 100644
--- a/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/LabelBuilder.java
+++ b/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/LabelBuilder.java
@@ -59,7 +59,7 @@ public class LabelBuilder implements InputFieldBuilder {
                 label);
     }
 
-    static final class LabelField extends ControlFieldAdapter<Label> {
+    static final class LabelField extends AbstractInputField<Label> {
 
         LabelField(
                 final ConfigurationAttribute attribute,
diff --git a/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/PassworFieldBuilder.java b/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/PassworFieldBuilder.java
new file mode 100644
index 00000000..7381e89f
--- /dev/null
+++ b/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/PassworFieldBuilder.java
@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2019 ETH Zürich, Educational Development and Technology (LET)
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+package ch.ethz.seb.sebserver.gui.service.examconfig.impl;
+
+import org.apache.commons.lang3.StringUtils;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.layout.GridData;
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Label;
+import org.eclipse.swt.widgets.Listener;
+import org.eclipse.swt.widgets.Text;
+
+import ch.ethz.seb.sebserver.gbl.model.sebconfig.AttributeType;
+import ch.ethz.seb.sebserver.gbl.model.sebconfig.ConfigurationAttribute;
+import ch.ethz.seb.sebserver.gbl.model.sebconfig.Orientation;
+import ch.ethz.seb.sebserver.gui.service.examconfig.InputField;
+import ch.ethz.seb.sebserver.gui.service.examconfig.InputFieldBuilder;
+
+public class PassworFieldBuilder implements InputFieldBuilder {
+
+    @Override
+    public boolean builderFor(
+            final ConfigurationAttribute attribute,
+            final Orientation orientation) {
+
+        if (attribute == null) {
+            return false;
+        }
+
+        return AttributeType.PASSWORD_FIELD == attribute.type;
+    }
+
+    @Override
+    public InputField createInputField(
+            final Composite parent,
+            final ConfigurationAttribute attribute,
+            final ViewContext viewContext) {
+
+        final Orientation orientation = viewContext.attributeMapping
+                .getOrientation(attribute.id);
+        final Composite innerGrid = InputFieldBuilder
+                .createInnerGrid(parent, orientation);
+
+        final Text passwordInput = new Text(innerGrid, SWT.LEFT | SWT.BORDER | SWT.PASSWORD);
+        passwordInput.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
+        final Text confirmInput = new Text(innerGrid, SWT.LEFT | SWT.BORDER | SWT.PASSWORD);
+        confirmInput.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
+
+        final PasswordInputField passwordInputField = new PasswordInputField(
+                attribute,
+                orientation,
+                passwordInput,
+                confirmInput,
+                InputFieldBuilder.createErrorLabel(innerGrid));
+
+        final Listener valueChangeEventListener = event -> {
+
+            final String pwd = passwordInput.getText();
+            final String confirm = confirmInput.getText();
+
+            if (StringUtils.isBlank(pwd) && StringUtils.isBlank(confirm)) {
+                return;
+            }
+
+            if (!pwd.equals(confirm)) {
+                passwordInputField.showError("TODO confirm password message");
+                return;
+            }
+
+            // TODO hash password
+
+            passwordInputField.clearError();
+            viewContext.getValueChangeListener().valueChanged(
+                    viewContext,
+                    attribute,
+                    pwd,
+                    passwordInputField.listIndex);
+        };
+
+        passwordInput.addListener(SWT.FocusOut, valueChangeEventListener);
+        passwordInput.addListener(SWT.Traverse, valueChangeEventListener);
+        confirmInput.addListener(SWT.FocusOut, valueChangeEventListener);
+        confirmInput.addListener(SWT.Traverse, valueChangeEventListener);
+        return passwordInputField;
+    }
+
+    static final class PasswordInputField extends AbstractInputField<Text> {
+
+        private final Text confirm;
+
+        PasswordInputField(
+                final ConfigurationAttribute attribute,
+                final Orientation orientation,
+                final Text control,
+                final Text confirm,
+                final Label errorLabel) {
+
+            super(attribute, orientation, control, errorLabel);
+            this.confirm = confirm;
+        }
+
+        @Override
+        protected void setDefaultValue() {
+            // TODO clarify setting some "fake" input when a password is set (like in config tool)
+            this.control.setText(this.initValue);
+            this.confirm.setText(this.initValue);
+        }
+
+    }
+
+}
diff --git a/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/TextFieldBuilder.java b/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/TextFieldBuilder.java
index 27d2f57f..824a6909 100644
--- a/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/TextFieldBuilder.java
+++ b/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/TextFieldBuilder.java
@@ -8,26 +8,21 @@
 
 package ch.ethz.seb.sebserver.gui.service.examconfig.impl;
 
-import java.util.Collection;
-
-import org.eclipse.rap.rwt.RWT;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.layout.GridData;
-import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Label;
+import org.eclipse.swt.widgets.Listener;
 import org.eclipse.swt.widgets.Text;
 import org.springframework.context.annotation.Lazy;
 import org.springframework.stereotype.Component;
 
 import ch.ethz.seb.sebserver.gbl.model.sebconfig.AttributeType;
 import ch.ethz.seb.sebserver.gbl.model.sebconfig.ConfigurationAttribute;
-import ch.ethz.seb.sebserver.gbl.model.sebconfig.ConfigurationValue;
 import ch.ethz.seb.sebserver.gbl.model.sebconfig.Orientation;
 import ch.ethz.seb.sebserver.gbl.profile.GuiProfile;
 import ch.ethz.seb.sebserver.gui.service.examconfig.InputField;
 import ch.ethz.seb.sebserver.gui.service.examconfig.InputFieldBuilder;
-import ch.ethz.seb.sebserver.gui.service.examconfig.ValueChangeListener;
 
 @Lazy
 @Component
@@ -57,53 +52,40 @@ public class TextFieldBuilder implements InputFieldBuilder {
 
         final Orientation orientation = viewContext.attributeMapping
                 .getOrientation(attribute.id);
-
-        final Composite comp = new Composite(parent, SWT.NONE);
-        final GridLayout gridLayout = new GridLayout();
-        gridLayout.verticalSpacing = 0;
-        comp.setLayout(gridLayout);
-        final GridData gridData = new GridData(
-                SWT.FILL, SWT.FILL,
-                true, false,
-                (orientation != null) ? orientation.width() : 1,
-                (orientation != null) ? orientation.height() : 1);
-        comp.setLayoutData(gridData);
+        final Composite innerGrid = InputFieldBuilder
+                .createInnerGrid(parent, orientation);
 
         final Text text;
         if (attribute.type == AttributeType.INTEGER ||
                 attribute.type == AttributeType.DECIMAL) {
 
-            text = new Text(comp, SWT.RIGHT | SWT.BORDER);
+            text = new Text(innerGrid, SWT.RIGHT | SWT.BORDER);
         } else {
-            text = new Text(comp, SWT.LEFT | SWT.BORDER);
+            text = new Text(innerGrid, SWT.LEFT | SWT.BORDER);
         }
         text.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
 
-        final Label errorLabel = new Label(comp, SWT.NONE);
-        errorLabel.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
-        errorLabel.setVisible(false);
-        errorLabel.setData(RWT.CUSTOM_VARIANT, "error");
+        final TextInputField textInputField = new TextInputField(
+                attribute,
+                orientation,
+                text,
+                InputFieldBuilder.createErrorLabel(innerGrid));
 
-        final TextInputField textInputField = new TextInputField(attribute, orientation, text, errorLabel);
-        final ValueChangeListener valueListener = viewContext.getValueChangeListener();
-        text.addListener(
-                SWT.FocusOut,
-                event -> {
-                    textInputField.clearError();
-                    valueListener.valueChanged(
-                            viewContext,
-                            attribute,
-                            String.valueOf(text.getText()),
-                            textInputField.listIndex);
-                });
+        final Listener valueChangeEventListener = event -> {
+            textInputField.clearError();
+            viewContext.getValueChangeListener().valueChanged(
+                    viewContext,
+                    attribute,
+                    String.valueOf(text.getText()),
+                    textInputField.listIndex);
+        };
 
+        text.addListener(SWT.FocusOut, valueChangeEventListener);
+        text.addListener(SWT.Traverse, valueChangeEventListener);
         return textInputField;
     }
 
-    static final class TextInputField extends ControlFieldAdapter<Text> {
-
-        private String initValue = "";
-        private int listIndex = 0;
+    static final class TextInputField extends AbstractInputField<Text> {
 
         TextInputField(
                 final ConfigurationAttribute attribute,
@@ -114,19 +96,6 @@ public class TextFieldBuilder implements InputFieldBuilder {
             super(attribute, orientation, control, errorLabel);
         }
 
-        @Override
-        public void initValue(final Collection<ConfigurationValue> values) {
-            values.stream()
-                    .filter(a -> this.attribute.id.equals(a.attributeId))
-                    .findFirst()
-                    .map(v -> {
-                        this.initValue = v.value;
-                        this.listIndex = (v.listIndex != null) ? v.listIndex : 0;
-                        setDefaultValue();
-                        return this.initValue;
-                    });
-        }
-
         @Override
         protected void setDefaultValue() {
             this.control.setText(this.initValue);
diff --git a/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/ViewGridBuilder.java b/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/ViewGridBuilder.java
index 21994427..045fda14 100644
--- a/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/ViewGridBuilder.java
+++ b/src/main/java/ch/ethz/seb/sebserver/gui/service/examconfig/impl/ViewGridBuilder.java
@@ -46,8 +46,6 @@ public class ViewGridBuilder {
         this.viewContext = viewContext;
         this.grid = new CellFieldBuilderAdapter[viewContext.rows][viewContext.columns];
         this.registeredGroups = new HashSet<>();
-
-        fillDummy(0, 0, viewContext.columns, viewContext.rows);
     }
 
     ViewGridBuilder add(final ConfigurationAttribute attribute) {
@@ -78,6 +76,10 @@ public class ViewGridBuilder {
         final int xpos = orientation.xpos();
         final int ypos = orientation.ypos();
 
+        if (orientation.width > 1 || orientation.height > 1) {
+            fillDummy(xpos, ypos, orientation.width, orientation.height);
+        }
+
         final InputFieldBuilder inputFieldBuilder = this.examConfigurationService.getInputFieldBuilder(
                 attribute,
                 orientation);
@@ -114,7 +116,8 @@ public class ViewGridBuilder {
             for (int x = 0; x < this.grid[y].length; x++) {
                 if (this.grid[y][x] == null) {
                     final Label empty = new Label(this.parent, SWT.LEFT);
-                    empty.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
+                    final GridData gridData = new GridData(SWT.FILL, SWT.FILL, true, false);
+                    empty.setLayoutData(gridData);
                     empty.setText("");
                 } else {
                     this.grid[y][x].createCell(this);
@@ -149,10 +152,6 @@ public class ViewGridBuilder {
                         attribute,
                         ViewGridBuilder.this.viewContext);
 
-//                final Orientation orientation =
-//                        ViewGridBuilder.this.viewContext.attributeMapping.getOrientation(attribute.id);
-//
-//                //inputField.setSpan(orientation.width, orientation.height);
                 ViewGridBuilder.this.viewContext.registerInputField(inputField);
             }
         };
@@ -257,13 +256,6 @@ public class ViewGridBuilder {
                     attr,
                     this.builder.viewContext);
 
-            final GridData gridData = new GridData(
-                    SWT.FILL, SWT.FILL,
-                    true, false,
-                    orientation.width(), orientation.height());
-
-            inputField.getControl().setLayoutData(gridData);
-            inputField.getControl().setToolTipText(attr.name);
             this.builder.viewContext.registerInputField(inputField);
         }
     }
diff --git a/src/main/java/ch/ethz/seb/sebserver/gui/service/page/PageContext.java b/src/main/java/ch/ethz/seb/sebserver/gui/service/page/PageContext.java
index f6afc4e6..a6ff1120 100644
--- a/src/main/java/ch/ethz/seb/sebserver/gui/service/page/PageContext.java
+++ b/src/main/java/ch/ethz/seb/sebserver/gui/service/page/PageContext.java
@@ -16,6 +16,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import ch.ethz.seb.sebserver.gbl.model.EntityKey;
+import ch.ethz.seb.sebserver.gui.service.i18n.I18nSupport;
 import ch.ethz.seb.sebserver.gui.service.i18n.LocTextKey;
 
 /** Holds a page-context and defines some convenient functionality for page handling */
@@ -39,6 +40,11 @@ public interface PageContext {
 
     }
 
+    /** Get the I18nSupport service
+     * 
+     * @return the I18nSupport service */
+    I18nSupport getI18nSupport();
+
     /** Use this to get the ComposerService used by this PageContext
      *
      * @return the ComposerService used by this PageContext */
diff --git a/src/main/java/ch/ethz/seb/sebserver/gui/service/page/impl/PageContextImpl.java b/src/main/java/ch/ethz/seb/sebserver/gui/service/page/impl/PageContextImpl.java
index 30c0cbb2..cd1b2258 100644
--- a/src/main/java/ch/ethz/seb/sebserver/gui/service/page/impl/PageContextImpl.java
+++ b/src/main/java/ch/ethz/seb/sebserver/gui/service/page/impl/PageContextImpl.java
@@ -59,6 +59,11 @@ public class PageContextImpl implements PageContext {
         this.attributes = Utils.immutableMapOf(attributes);
     }
 
+    @Override
+    public I18nSupport getI18nSupport() {
+        return this.i18nSupport;
+    }
+
     @Override
     public Shell getShell() {
         if (this.root == null) {
@@ -328,5 +333,4 @@ public class PageContextImpl implements PageContext {
             this.onOK.accept(false);
         }
     }
-
 }
diff --git a/src/main/java/ch/ethz/seb/sebserver/gui/widget/WidgetFactory.java b/src/main/java/ch/ethz/seb/sebserver/gui/widget/WidgetFactory.java
index e666a45b..28aca998 100644
--- a/src/main/java/ch/ethz/seb/sebserver/gui/widget/WidgetFactory.java
+++ b/src/main/java/ch/ethz/seb/sebserver/gui/widget/WidgetFactory.java
@@ -117,7 +117,8 @@ public class WidgetFactory {
         FOOTER("footer"),
         TITLE_LABEL("head"),
 
-        MESSAGE("message")
+        MESSAGE("message"),
+        ERROR("error")
 
         ;
 
diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/client/ClientCredentialServiceImpl.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/client/ClientCredentialServiceImpl.java
index eb304889..0a2f7456 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/client/ClientCredentialServiceImpl.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/client/ClientCredentialServiceImpl.java
@@ -12,8 +12,6 @@ import java.io.UnsupportedEncodingException;
 import java.security.SecureRandom;
 
 import org.apache.commons.lang3.RandomStringUtils;
-import org.cryptonode.jncryptor.AES256JNCryptor;
-import org.cryptonode.jncryptor.JNCryptor;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.context.annotation.Lazy;
@@ -36,9 +34,6 @@ public class ClientCredentialServiceImpl implements ClientCredentialService {
 
     private final Environment environment;
 
-    // TODO try to integrate with JNCryptor since this is also used by SEB
-    private final JNCryptor cryptor = new AES256JNCryptor();
-
     protected ClientCredentialServiceImpl(final Environment environment) {
         this.environment = environment;
     }
diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/sebconfig/ConfigurationValueValidator.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/sebconfig/ConfigurationValueValidator.java
index 978b1dcf..58e78d46 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/sebconfig/ConfigurationValueValidator.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/sebconfig/ConfigurationValueValidator.java
@@ -35,7 +35,13 @@ public interface ConfigurationValueValidator {
             final ConfigurationValue value,
             final ConfigurationAttribute attribute) {
 
-        return "examConfigValue:" + attribute.name + ":" + name() + ":" + value.listIndex;
+        return new StringBuffer("examConfigValue:")
+                .append(attribute.name)
+                .append(":")
+                .append(name())
+                .append(":")
+                .append(value.listIndex)
+                .toString();
     }
 
 }
diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/sebconfig/impl/DecimalTypeValidator.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/sebconfig/impl/DecimalTypeValidator.java
new file mode 100644
index 00000000..1e8d9493
--- /dev/null
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/sebconfig/impl/DecimalTypeValidator.java
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2019 ETH Zürich, Educational Development and Technology (LET)
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+package ch.ethz.seb.sebserver.webservice.servicelayer.sebconfig.impl;
+
+import org.apache.commons.lang3.StringUtils;
+import org.springframework.context.annotation.Lazy;
+import org.springframework.stereotype.Component;
+
+import ch.ethz.seb.sebserver.gbl.model.sebconfig.AttributeType;
+import ch.ethz.seb.sebserver.gbl.model.sebconfig.ConfigurationAttribute;
+import ch.ethz.seb.sebserver.gbl.model.sebconfig.ConfigurationValue;
+import ch.ethz.seb.sebserver.gbl.profile.WebServiceProfile;
+import ch.ethz.seb.sebserver.webservice.servicelayer.sebconfig.ConfigurationValueValidator;
+
+@Lazy
+@Component
+@WebServiceProfile
+public class DecimalTypeValidator implements ConfigurationValueValidator {
+
+    @Override
+    public String name() {
+        return AttributeType.DECIMAL.name();
+    }
+
+    @Override
+    public boolean validate(
+            final ConfigurationValue value,
+            final ConfigurationAttribute attribute) {
+
+        // if value is not an integer type or another specific validation is defined --> skip
+        if (attribute.type != AttributeType.DECIMAL ||
+                StringUtils.isNoneBlank(attribute.validator)) {
+
+            return true;
+        }
+
+        if (StringUtils.isBlank(value.value)) {
+            return true;
+        }
+
+        try {
+            Double.parseDouble(value.value);
+            return true;
+        } catch (final NumberFormatException nfe) {
+            return false;
+        }
+    }
+
+}
diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/sebconfig/impl/IntegerTypeValueValidator.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/sebconfig/impl/IntegerTypeValidator.java
similarity index 92%
rename from src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/sebconfig/impl/IntegerTypeValueValidator.java
rename to src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/sebconfig/impl/IntegerTypeValidator.java
index 97b9dd50..4dd7ed95 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/sebconfig/impl/IntegerTypeValueValidator.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/sebconfig/impl/IntegerTypeValidator.java
@@ -21,7 +21,7 @@ import ch.ethz.seb.sebserver.webservice.servicelayer.sebconfig.ConfigurationValu
 @Lazy
 @Component
 @WebServiceProfile
-public class IntegerTypeValueValidator implements ConfigurationValueValidator {
+public class IntegerTypeValidator implements ConfigurationValueValidator {
 
     @Override
     public String name() {
diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/sebconfig/impl/SebConfigEncryptionServiceImpl.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/sebconfig/impl/SebConfigEncryptionServiceImpl.java
index a1690597..57045e80 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/sebconfig/impl/SebConfigEncryptionServiceImpl.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/sebconfig/impl/SebConfigEncryptionServiceImpl.java
@@ -154,7 +154,8 @@ public final class SebConfigEncryptionServiceImpl implements SebConfigEncryption
             input.get(b);
             return ByteBuffer.wrap(b).asReadOnlyBuffer();
         } else {
-            return input.clear().asReadOnlyBuffer();
+            input.clear();
+            return input.asReadOnlyBuffer();
         }
     }
 
diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/weblayer/api/ConfigurationController.java b/src/main/java/ch/ethz/seb/sebserver/webservice/weblayer/api/ConfigurationController.java
index d402c12b..7ee8ff2b 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/weblayer/api/ConfigurationController.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/weblayer/api/ConfigurationController.java
@@ -31,7 +31,6 @@ import ch.ethz.seb.sebserver.webservice.servicelayer.PaginationService;
 import ch.ethz.seb.sebserver.webservice.servicelayer.authorization.AuthorizationService;
 import ch.ethz.seb.sebserver.webservice.servicelayer.bulkaction.BulkActionService;
 import ch.ethz.seb.sebserver.webservice.servicelayer.dao.ConfigurationDAO;
-import ch.ethz.seb.sebserver.webservice.servicelayer.dao.ConfigurationNodeDAO;
 import ch.ethz.seb.sebserver.webservice.servicelayer.dao.UserActivityLogDAO;
 import ch.ethz.seb.sebserver.webservice.servicelayer.validation.BeanValidationService;
 
@@ -41,7 +40,6 @@ import ch.ethz.seb.sebserver.webservice.servicelayer.validation.BeanValidationSe
 public class ConfigurationController extends EntityController<Configuration, Configuration> {
 
     private final ConfigurationDAO configurationDAO;
-    private final ConfigurationNodeDAO configurationNodeDAO;
 
     protected ConfigurationController(
             final AuthorizationService authorization,
@@ -49,8 +47,7 @@ public class ConfigurationController extends EntityController<Configuration, Con
             final ConfigurationDAO entityDAO,
             final UserActivityLogDAO userActivityLogDAO,
             final PaginationService paginationService,
-            final BeanValidationService beanValidationService,
-            final ConfigurationNodeDAO configurationNodeDAO) {
+            final BeanValidationService beanValidationService) {
 
         super(authorization,
                 bulkActionService,
@@ -60,7 +57,6 @@ public class ConfigurationController extends EntityController<Configuration, Con
                 beanValidationService);
 
         this.configurationDAO = entityDAO;
-        this.configurationNodeDAO = configurationNodeDAO;
     }
 
     @RequestMapping(
diff --git a/src/main/resources/messages.properties b/src/main/resources/messages.properties
index d8354dab..c3e04aa0 100644
--- a/src/main/resources/messages.properties
+++ b/src/main/resources/messages.properties
@@ -374,4 +374,9 @@ sebserver.examconfig.props.form.views.testView=Test View
 sebserver.examconfig.props.form.views.testView.tooltip=This is a test View
 sebserver.examconfig.props.action.list.modify=Edit Properties
 
-sebserver.examconfig.props.label.testNumber=Test Number
+sebserver.examconfig.props.label.testNumber1=Test Number 1
+sebserver.examconfig.props.label.testNumber2=Test Number 2
+
+sebserver.examconfig.props.validation.unexpected=Unexpected error happened. Value was not set correctly
+sebserver.examconfig.props.validation.INTEGER=Invalid number
+sebserver.examconfig.props.validation.DECIMAL=Invalid decimal number