Index: lams_common/src/java/org/lamsfoundation/lams/config/dao/hibernate/ConfigurationDAO.java
===================================================================
diff -u -r7475d08afc280b5e2e5ddf04e8bf35e3166aaf80 -raaf2f15ad427fc713849cf696579ab4542ac75c2
--- lams_common/src/java/org/lamsfoundation/lams/config/dao/hibernate/ConfigurationDAO.java	(.../ConfigurationDAO.java)	(revision 7475d08afc280b5e2e5ddf04e8bf35e3166aaf80)
+++ lams_common/src/java/org/lamsfoundation/lams/config/dao/hibernate/ConfigurationDAO.java	(.../ConfigurationDAO.java)	(revision aaf2f15ad427fc713849cf696579ab4542ac75c2)
@@ -46,7 +46,10 @@
     @Override
     @SuppressWarnings("unchecked")
     public List<ConfigurationItem> getAllItems() {
-	return super.findAll(ConfigurationItem.class);
+	List<ConfigurationItem> result = super.findAll(ConfigurationItem.class);
+	// close session here because of LDEV-4801
+	getSession().close();
+	return result;
     }
 
     /**
Index: lams_common/src/java/org/lamsfoundation/lams/util/Configuration.java
===================================================================
diff -u -r3e7ee4e7075a1f360de05a43f6630ed3d8b95c6b -raaf2f15ad427fc713849cf696579ab4542ac75c2
--- lams_common/src/java/org/lamsfoundation/lams/util/Configuration.java	(.../Configuration.java)	(revision 3e7ee4e7075a1f360de05a43f6630ed3d8b95c6b)
+++ lams_common/src/java/org/lamsfoundation/lams/util/Configuration.java	(.../Configuration.java)	(revision aaf2f15ad427fc713849cf696579ab4542ac75c2)
@@ -201,6 +201,8 @@
 
     @Override
     public void afterPropertiesSet() {
+	// it should be wrapped in HibernateSessionManager.openSession() and closeSession(),
+	// but ConfigurationDAO.getAllItems() does session closing anyway - see LDEV-4801
 	Configuration.refreshCache();
 
 	new Thread("LAMSConfigurationServerStateCheckThread") {
@@ -262,7 +264,7 @@
      */
     public HashMap<String, ArrayList<ConfigurationItem>> arrangeItems(int filter) {
 	List<ConfigurationItem> originalList = Configuration.getAllItems();
-	HashMap<String, ArrayList<ConfigurationItem>> groupedList = new HashMap<String, ArrayList<ConfigurationItem>>();
+	HashMap<String, ArrayList<ConfigurationItem>> groupedList = new HashMap<>();
 
 	for (int i = 0; i < originalList.size(); i++) {
 	    ConfigurationItem item = originalList.get(i);
Index: lams_common/src/java/org/lamsfoundation/lams/util/ConfigurationRefreshCacheJob.java
===================================================================
diff -u -r7475d08afc280b5e2e5ddf04e8bf35e3166aaf80 -raaf2f15ad427fc713849cf696579ab4542ac75c2
--- lams_common/src/java/org/lamsfoundation/lams/util/ConfigurationRefreshCacheJob.java	(.../ConfigurationRefreshCacheJob.java)	(revision 7475d08afc280b5e2e5ddf04e8bf35e3166aaf80)
+++ lams_common/src/java/org/lamsfoundation/lams/util/ConfigurationRefreshCacheJob.java	(.../ConfigurationRefreshCacheJob.java)	(revision aaf2f15ad427fc713849cf696579ab4542ac75c2)
@@ -33,6 +33,8 @@
 public class ConfigurationRefreshCacheJob extends QuartzJobBean {
     @Override
     protected void executeInternal(JobExecutionContext context) throws JobExecutionException {
+	// it should be wrapped in HibernateSessionManager.openSession() and closeSession(),
+	// but ConfigurationDAO.getAllItems() does session closing anyway - see LDEV-4801
 	Configuration.refreshCache();
     }
 }
\ No newline at end of file