shouldn't something like this do the trick?

PLINK2-24.patch

Index: picketlink-core/src/main/java/org/picketlink/identity/federation/web/servlets/saml/MetadataServlet.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- picketlink-core/src/main/java/org/picketlink/identity/federation/web/servlets/saml/MetadataServlet.java	(date 1375774867000)
+++ picketlink-core/src/main/java/org/picketlink/identity/federation/web/servlets/saml/MetadataServlet.java	(revision )
@@ -110,7 +110,7 @@
             signingAlias = config.getInitParameter("signingAlias");
             encryptingAlias = config.getInitParameter("encryptingAlias");
 
-            ProviderType providerType = ConfigurationUtil.getIDPConfiguration(is);
+            ProviderType providerType = ConfigurationUtil.getConfiguration(is).getIdpOrSP();
             metadataProviderType = providerType.getMetaDataProvider();
             String fqn = metadataProviderType.getClassName();
             Class<?> clazz = SecurityActions.loadClass(getClass(), fqn);
\ No newline at end of file

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