Index: https://svn.onehippo.org/repos/closed/projects/ons/trunk/defensie/bootstrap/configuration/src/main/resources/namespaces/defensiebaz/illustrationupload.xml
===================================================================
--- https://svn.onehippo.org/repos/closed/projects/ons/trunk/defensie/bootstrap/configuration/src/main/resources/namespaces/defensiebaz/illustrationupload.xml	(revision 174096)
+++ https://svn.onehippo.org/repos/closed/projects/ons/trunk/defensie/bootstrap/configuration/src/main/resources/namespaces/defensiebaz/illustrationupload.xml	(revision 174097)
@@ -61,6 +61,7 @@
           <sv:value>platformcomponents:documentresource</sv:value>
         </sv:property>
         <sv:property sv:multiple="true" sv:name="hipposysedit:validators" sv:type="String">
+          <sv:value>resource-required</sv:value>
           <sv:value>required</sv:value>
         </sv:property>
       </sv:node>
Index: https://svn.onehippo.org/repos/closed/projects/ons/trunk/defensie/bootstrap/configuration/src/main/resources/namespaces/defensiebaz/mutationupload.xml
===================================================================
--- https://svn.onehippo.org/repos/closed/projects/ons/trunk/defensie/bootstrap/configuration/src/main/resources/namespaces/defensiebaz/mutationupload.xml	(revision 174096)
+++ https://svn.onehippo.org/repos/closed/projects/ons/trunk/defensie/bootstrap/configuration/src/main/resources/namespaces/defensiebaz/mutationupload.xml	(revision 174097)
@@ -61,6 +61,7 @@
           <sv:value>platformcomponents:documentresource</sv:value>
         </sv:property>
         <sv:property sv:multiple="true" sv:name="hipposysedit:validators" sv:type="String">
+          <sv:value>resource-required</sv:value>
           <sv:value>required</sv:value>
         </sv:property>
       </sv:node>
Index: plugins/core/cms/src/main/java/nl/rijksoverheid/platform/cms/frontend/plugins/validator/ResourceRequiredValidator.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- plugins/core/cms/src/main/java/nl/rijksoverheid/platform/cms/frontend/plugins/validator/ResourceRequiredValidator.java	(revision 174097)
+++ plugins/core/cms/src/main/java/nl/rijksoverheid/platform/cms/frontend/plugins/validator/ResourceRequiredValidator.java	(revision 174097)
@@ -0,0 +1,76 @@
+package nl.rijksoverheid.platform.cms.frontend.plugins.validator;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import javax.jcr.Node;
+import javax.jcr.Property;
+import javax.jcr.RepositoryException;
+import javax.jcr.Session;
+import javax.jcr.nodetype.NodeType;
+import javax.jcr.nodetype.NodeTypeManager;
+
+import org.apache.wicket.model.IModel;
+import org.hippoecm.frontend.editor.validator.plugins.AbstractCmsValidator;
+import org.hippoecm.frontend.model.JcrNodeModel;
+import org.hippoecm.frontend.plugin.IPluginContext;
+import org.hippoecm.frontend.plugin.config.IPluginConfig;
+import org.hippoecm.frontend.validation.IFieldValidator;
+import org.hippoecm.frontend.validation.ValidationException;
+import org.hippoecm.frontend.validation.Violation;
+import org.hippoecm.repository.api.HippoNodeType;
+
+import nl.rijksoverheid.platform.cms.util.PluginHelper;
+
+/**
+ * ResourceRequiredValidator validates fields that are a (subtype of) {@link: HippoNodeType.NT_RESOURCE} that a resource
+ * has been uploaded.
+ *
+ * @author David de Bos
+ */
+public class ResourceRequiredValidator extends AbstractCmsValidator {
+
+    public static final String INVALID_VALIDATION_EXCEPTION_ERROR_MESSAGE = "Invalid validation exception. " +
+            "A ResourceRequiredValidator can only be used for field types that are a (subtype of) " +
+            HippoNodeType.NT_RESOURCE;
+
+    public ResourceRequiredValidator(final IPluginContext context, final IPluginConfig config) {
+        super(context, config);
+    }
+
+    @Override
+    public void preValidation(final IFieldValidator type) throws ValidationException {
+        if (!isAHippoResource(type)) {
+            throw new ValidationException(INVALID_VALIDATION_EXCEPTION_ERROR_MESSAGE);
+        }
+    }
+
+    private boolean isAHippoResource(final IFieldValidator type) throws ValidationException {
+        String jcrTypeName = type.getFieldType().getType();
+        try {
+            Session jcrSession = PluginHelper.obtainJcrSession();
+            NodeTypeManager typeManager = jcrSession.getWorkspace().getNodeTypeManager();
+            NodeType nodeType = typeManager.getNodeType(jcrTypeName);
+            return nodeType.isNodeType(HippoNodeType.NT_RESOURCE);
+        } catch (RepositoryException e) {
+            throw new ValidationException(e);
+        }
+    }
+
+    @Override
+    public Set<Violation> validate(final IFieldValidator fieldValidator, final JcrNodeModel model,
+                                   final IModel childModel) throws ValidationException {
+        Set<Violation> violations = new HashSet<>();
+        try {
+            Node node = ((JcrNodeModel) childModel).getNode();
+            Property resourceData = node.getProperty("jcr:data");
+            if (!(resourceData.getLength() > 0)) {
+                violations.add(fieldValidator.newValueViolation(childModel, getTranslation()));
+            }
+        } catch (Exception e) {
+            throw new ValidationException(e);
+        }
+
+        return violations;
+    }
+}
Index: plugins/core/repository/src/main/resources/configuration/frontend/cms-validators/resource-required-translations.xml
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- plugins/core/repository/src/main/resources/configuration/frontend/cms-validators/resource-required-translations.xml	(revision 174097)
+++ plugins/core/repository/src/main/resources/configuration/frontend/cms-validators/resource-required-translations.xml	(revision 174097)
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<sv:node sv:name="resource-required" xmlns:sv="http://www.jcp.org/jcr/sv/1.0">
+  <sv:property sv:name="jcr:primaryType" sv:type="Name">
+    <sv:value>frontend:pluginconfig</sv:value>
+  </sv:property>
+  <sv:property sv:multiple="true" sv:name="jcr:mixinTypes" sv:type="Name">
+    <sv:value>hippo:translated</sv:value>
+  </sv:property>
+  <sv:node sv:name="hippo:translation">
+    <sv:property sv:name="jcr:primaryType" sv:type="Name">
+      <sv:value>hippo:translation</sv:value>
+    </sv:property>
+    <sv:property sv:name="hippo:language" sv:type="String">
+      <sv:value>nl</sv:value>
+    </sv:property>
+    <sv:property sv:name="hippo:message" sv:type="String">
+      <sv:value>U moet een bestand uploaden</sv:value>
+    </sv:property>
+  </sv:node>
+  <sv:node sv:name="hippo:translation">
+    <sv:property sv:name="jcr:primaryType" sv:type="Name">
+      <sv:value>hippo:translation</sv:value>
+    </sv:property>
+    <sv:property sv:name="hippo:language" sv:type="String">
+      <sv:value>en</sv:value>
+    </sv:property>
+    <sv:property sv:name="hippo:message" sv:type="String">
+      <sv:value>You must upload a file</sv:value>
+    </sv:property>
+  </sv:node>
+</sv:node>
Index: plugins/core/repository/src/main/resources/configuration/frontend/cms-validators/resource-required.xml
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- plugins/core/repository/src/main/resources/configuration/frontend/cms-validators/resource-required.xml	(revision 174097)
+++ plugins/core/repository/src/main/resources/configuration/frontend/cms-validators/resource-required.xml	(revision 174097)
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<sv:node sv:name="resource-required" xmlns:sv="http://www.jcp.org/jcr/sv/1.0">
+  <sv:property sv:name="jcr:primaryType" sv:type="Name">
+    <sv:value>frontend:plugin</sv:value>
+  </sv:property>
+  <sv:property sv:name="plugin.class" sv:type="String">
+    <sv:value>nl.rijksoverheid.platform.cms.frontend.plugins.validator.ResourceRequiredValidator</sv:value>
+  </sv:property>
+</sv:node>
Index: plugins/core/repository/src/main/resources/hippoecm-extension.xml
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- plugins/core/repository/src/main/resources/hippoecm-extension.xml	(revision 174096)
+++ plugins/core/repository/src/main/resources/hippoecm-extension.xml	(revision 174097)
@@ -1968,6 +1968,42 @@
     </sv:property>
   </sv:node>
 
+  <sv:node sv:name="platform-hippo-configuration-cms-validators-resource-required">
+    <sv:property sv:name="hippo:reloadonstartup" sv:type="Boolean">
+      <sv:value>true</sv:value>
+    </sv:property>
+    <sv:property sv:name="jcr:primaryType" sv:type="Name">
+      <sv:value>hippo:initializeitem</sv:value>
+    </sv:property>
+    <sv:property sv:name="hippo:sequence" sv:type="Double">
+      <sv:value>32002.8</sv:value>
+    </sv:property>
+    <sv:property sv:name="hippo:contentresource" sv:type="String">
+      <sv:value>configuration/frontend/cms-validators/resource-required.xml</sv:value>
+    </sv:property>
+    <sv:property sv:name="hippo:contentroot" sv:type="String">
+      <sv:value>/hippo:configuration/hippo:frontend/cms/cms-validators</sv:value>
+    </sv:property>
+  </sv:node>
+
+  <sv:node sv:name="platform-hippo-configuration-cms-validators-resource-required-translations">
+    <sv:property sv:name="hippo:reloadonstartup" sv:type="Boolean">
+      <sv:value>true</sv:value>
+    </sv:property>
+    <sv:property sv:name="jcr:primaryType" sv:type="Name">
+      <sv:value>hippo:initializeitem</sv:value>
+    </sv:property>
+    <sv:property sv:name="hippo:sequence" sv:type="Double">
+      <sv:value>32002.9</sv:value>
+    </sv:property>
+    <sv:property sv:name="hippo:contentresource" sv:type="String">
+      <sv:value>configuration/frontend/cms-validators/resource-required-translations.xml</sv:value>
+    </sv:property>
+    <sv:property sv:name="hippo:contentroot" sv:type="String">
+      <sv:value>/hippo:configuration/hippo:frontend/cms/cms-validators/validationTranslator/hippostd:translations</sv:value>
+    </sv:property>
+  </sv:node>
+
   <sv:node sv:name="platform-hippo-configuration-cms-static-wicket-custom-skin">
     <sv:property sv:name="jcr:primaryType" sv:type="Name">
       <sv:value>hippo:initializeitem</sv:value>
\ No newline at end of file