bugfix: missing JSESSIONIDVERSION leads to session not being correctly retrieved in relaxed mode

This only happens on a first request that happens in parallel with session creation, so very sporadic

Author: lprimak

appserver/web/web-ha/src/main/java/org/glassfish/web/ha/session/management/ReplicationManagerBase.java

@@ -37,7 +37,7 @@
  * only if the new code is made subject to such option by the copyright
  * holder.
  */
-// Portions Copyright [2016] [Payara Foundation and/or its affiliates]
+// Portions Copyright [2016-2026] [Payara Foundation and/or its affiliates]
 
 package org.glassfish.web.ha.session.management;
 
@@ -108,6 +108,12 @@ public Session findSession(String id, String version) throws IOException {
         if(_logger.isLoggable(Level.FINE)) {
             _logger.fine("in findSession: version=" + version);
         }
+
+        if (isRelaxCacheVersionSemantics() && version == null) {
+            _logger.fine("Relaxed cache version semantics enabled and version is null, treating as version -1");
+            version = "-1";
+        }
+
         if(!this.isSessionIdValid(id) || version == null) {
             return null;
         }