Fix Exceptions in RDF Indexing

diff --git a/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/UnsupportedLanguageException.java b/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/UnsupportedLanguageException.java
index 3e02eb9..08c0d00 100644
--- a/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/UnsupportedLanguageException.java
+++ b/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/UnsupportedLanguageException.java

@@ -19,10 +19,10 @@
  */
 package org.apache.polygene.index.rdf;
 
+import org.apache.polygene.api.indexing.IndexingException;
 import org.openrdf.query.QueryLanguage;
 
-public class UnsupportedLanguageException
-    extends RuntimeException
+public class UnsupportedLanguageException extends IndexingException
 {
     private QueryLanguage language;
 

diff --git a/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/assembly/RdfMemoryStoreAssembler.java b/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/assembly/RdfMemoryStoreAssembler.java
index ef6f5bd..5299c48 100644
--- a/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/assembly/RdfMemoryStoreAssembler.java
+++ b/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/assembly/RdfMemoryStoreAssembler.java

@@ -46,6 +46,7 @@
     @Override
     public void assemble( ModuleAssembly module )
     {
+        super.assemble( module );
         module.services( MemoryRepositoryService.class )
               .visibleIn( repositoryVisibility )
               .instantiateOnStartup();

diff --git a/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/assembly/RdfNativeSesameStoreAssembler.java b/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/assembly/RdfNativeSesameStoreAssembler.java
index 7fb19a9..5014acc 100644
--- a/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/assembly/RdfNativeSesameStoreAssembler.java
+++ b/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/assembly/RdfNativeSesameStoreAssembler.java

@@ -47,6 +47,7 @@
     @Override
     public void assemble( ModuleAssembly module )
     {
+        super.assemble( module );
         module.services( NativeRepositoryService.class )
               .visibleIn( repositoryVisibility )
               .instantiateOnStartup();

diff --git a/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/assembly/RdfRdbmsSesameStoreAssembler.java b/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/assembly/RdfRdbmsSesameStoreAssembler.java
index 1176e16..521476f 100644
--- a/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/assembly/RdfRdbmsSesameStoreAssembler.java
+++ b/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/assembly/RdfRdbmsSesameStoreAssembler.java

@@ -47,6 +47,7 @@
     @Override
     public void assemble( ModuleAssembly module )
     {
+        super.assemble( module );
         module.services( RdbmsRepositoryService.class )
               .visibleIn( repositoryVisibility )
               .instantiateOnStartup();

diff --git a/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/indexing/RdfIndexExporter.java b/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/indexing/RdfIndexExporter.java
index ad0e599..b33eea9 100644
--- a/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/indexing/RdfIndexExporter.java
+++ b/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/indexing/RdfIndexExporter.java

@@ -77,6 +77,7 @@
                 catch( Exception e )
                 {
                     e.printStackTrace();
+                    throw new IOException( "Problem writing to RdfWriter", e );
                 }
                 finally
                 {

diff --git a/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/indexing/RdfIndexerService.java b/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/indexing/RdfIndexerService.java
index d47a7f7..38f501a 100644
--- a/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/indexing/RdfIndexerService.java
+++ b/extensions/indexing-rdf/src/main/java/org/apache/polygene/index/rdf/indexing/RdfIndexerService.java

@@ -125,7 +125,7 @@
             catch( Throwable e )
             {
                 e.printStackTrace();
-                //TODO What shall we do with the exception?
+                //TODO What shall we do with the exception? Probably figure out if we can recover, and possibly queue the state changes and retry later.
             }
         }