fix 6

state_machine_exporter/src/main/java/click/kamil/springstatemachineexporter/analysis/service/CallGraphBuilder.java

@@ -222,6 +222,50 @@ public class CallGraphBuilder {
             }
         }
         
+        // LAST RESORT FALLBACK: If AST deep trace failed to find a valid ALL_CAPS constant
+        // (e.g. it returned a field name like 'type', or nothing), we can scrape the resolvedValue string directly
+        // for string literals or enum-like constants.
+        boolean hasValidConstant = false;
+        for (String ev : polymorphicEvents) {
+            String val = ev.contains(".") ? ev.substring(ev.lastIndexOf('.') + 1) : ev;
+            if (val.equals(val.toUpperCase()) && val.length() > 2) {
+                hasValidConstant = true;
+                break;
+            }
+        }
+        
+        if (!hasValidConstant && resolvedValue.contains("(")) {
+             java.util.List<String> scraped = new java.util.ArrayList<>();
+             
+             // Extract "STRING_LITERALS"
+             java.util.regex.Matcher m1 = java.util.regex.Pattern.compile("\"([^\"]+)\"").matcher(resolvedValue);
+             while (m1.find()) {
+                 scraped.add(m1.group(1));
+             }
+             
+             // Extract ENUM_LIKE_CONSTANTS
+             java.util.regex.Matcher m2 = java.util.regex.Pattern.compile("\\b([A-Z_]{3,})\\b").matcher(resolvedValue);
+             while (m2.find()) {
+                 if (!scraped.contains(m2.group(1))) {
+                     scraped.add(m2.group(1));
+                 }
+             }
+             
+             if (!scraped.isEmpty()) {
+                 polymorphicEvents.clear();
+                 polymorphicEvents.addAll(scraped);
+             }
+        }
+        
+        // Clean up any remaining invalid AST fallbacks (like 'type', 'event') if we found valid ones
+        if (polymorphicEvents.size() > 1) {
+            polymorphicEvents.removeIf(e -> {
+                String val = e.contains(".") ? e.substring(e.lastIndexOf('.') + 1) : e;
+                return !val.equals(val.toUpperCase()) || val.length() <= 2;
+            });
+        }
+
+        
         if (!resolvedValue.equals(event) || !polymorphicEvents.isEmpty()) {
             return TriggerPoint.builder()
                     .event(resolvedValue)