### Eclipse Workspace Patch 1.0
#P xwiki-core-parent
Index: xwiki-rendering/xwiki-rendering-macros/xwiki-rendering-macro-wikibridge/src/main/java/org/xwiki/rendering/internal/macro/wikibridge/DefaultWikiMacro.java
===================================================================
--- xwiki-rendering/xwiki-rendering-macros/xwiki-rendering-macro-wikibridge/src/main/java/org/xwiki/rendering/internal/macro/wikibridge/DefaultWikiMacro.java	(revision 27292)
+++ xwiki-rendering/xwiki-rendering-macros/xwiki-rendering-macro-wikibridge/src/main/java/org/xwiki/rendering/internal/macro/wikibridge/DefaultWikiMacro.java	(working copy)
@@ -159,9 +159,15 @@
         Map<String, ParameterDescriptor> parameterDescriptors = getDescriptor().getParameterDescriptorMap();
         for (String parameterName : parameterDescriptors.keySet()) {
             ParameterDescriptor parameterDescriptor = parameterDescriptors.get(parameterName);
-            if (parameterDescriptor.isMandatory() && (null == parameters.get(parameterName))) {
+            Object parameterValue = parameters.get(parameterName);
+            if (parameterDescriptor.isMandatory() && (null == parameterValue)) {
                 throw new MacroParameterException(String.format("Parameter [%s] is mandatory", parameterName));
             }
+            // set default value as the value, if no value is provided by the user
+            Object parameterDefaultValue = parameterDescriptor.getDefaultValue();
+            if (parameterValue == null && parameterDefaultValue != null) {
+                parameters.set(parameterName, parameterDefaultValue);
+            }
         }
 
         // Verify the a macro content is not empty if it was declared mandatory.