jomarko commented on code in PR #6254:
URL: 
https://github.com/apache/incubator-kie-drools/pull/6254#discussion_r1957924383


##########
drools-scenario-simulation/drools-scenario-simulation-backend/src/main/java/org/drools/scenariosimulation/backend/util/ScenarioSimulationXMLPersistence.java:
##########
@@ -179,18 +177,17 @@ public String migrateIfNecessary(String rawXml) throws 
Exception {
                                                        
.append(CURRENT_VERSION).toString());
         }
         migrator = migrator.andThen(getMigrationStrategy().end());
-        Document document = DOMParserUtil.getDocument(rawXml);
         migrator.accept(document);
         return DOMParserUtil.getString(document);
     }
 
-    public String extractVersion(String rawXml) {
-        Matcher m = p.matcher(rawXml);
-
-        if (m.find()) {
-            return m.group(1);
+    public String extractVersion(Document document) {
+        try {
+            return 
document.getElementsByTagName(SCENARIO_SIMULATION_MODEL_NODE)
+                    
.item(0).getAttributes().getNamedItem(VERSION_ATTRIBUTE).getTextContent();
+        } catch (Exception e) {
+            throw new IllegalArgumentException("Impossible to extract version 
from the file", e);
         }

Review Comment:
   My only point is only about catching an exception and immediately throwing 
new one. I believe we could use this approach to avoid `try` `catch` approach. 
   
   
https://medium.com/@gurkanucar/how-to-prevent-null-pointer-exceptions-in-java-8d7c894c9bb4



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