add more logging to the transaction controller in the server

tools/server-spring/src/main/java/org/eclipse/rdf4j/http/server/repository/transaction/TransactionController.java

@@ -37,6 +37,7 @@
 import java.util.Enumeration;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Optional;
 import java.util.UUID;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
@@ -637,6 +638,24 @@ private ModelAndView getSparqlUpdateResult(Transaction transaction, HttpServletR
 			}
 		}
 
+		if (logger.isDebugEnabled()) {
+			StringBuilder datasetStr = new StringBuilder();
+			dataset.getDefaultGraphs()
+					.forEach(g -> datasetStr.append("DEFAULT GRAPH: FROM <").append(g.stringValue()).append(">\n"));
+			dataset.getNamedGraphs()
+					.forEach(g -> datasetStr.append("NAMED GRAPH: FROM NAMED <").append(g.stringValue()).append(">\n"));
+			dataset.getDefaultRemoveGraphs()
+					.forEach(g -> datasetStr.append("DEFAULT REMOVE GRAPH: DELETE FROM <")
+							.append(g.stringValue())
+							.append(">\n"));
+			Optional.ofNullable(dataset.getDefaultInsertGraph())
+					.ifPresent(g -> datasetStr.append("DEFAULT INSERT GRAPH: INSERT INTO <")
+							.append(g.stringValue())
+							.append(">\n"));
+
+			logger.debug("Dataset: {}", datasetStr);
+		}
+
 		try {
 			// determine if any variable bindings have been set on this update.
 			@SuppressWarnings("unchecked")