This might be a stupid question, but I am really confused after Googling.
We have a very big Java EE application. Now when it's time to go to production, there are a number of performance related problems raised. I am trying to get to the bottom of a memory leak issue. When I was looking through JProfiler, I found some enum variables that will not be garbage collected.
Just an example:
The application has one session factory, which is a kind of map i.e. Map<SessionKey, Object>. When the user is logged in that map will fill up and it will be cleared when that user logs out.
But with JProfiler I encountered some strange behavior. It shows SessionKey memory allocation increasing with the number of logins. When I'm logged in for the first time it shows 106 difference and after the second login it shows 206 difference in JProfiler. So this means the difference is increasing and increases more frequently.
is it enum never eligible for garbage collection?
I could not get it that what is wrong in it. Or I understand wrong. Let me know for more detail.
public enum SessionKey{
LOGGEDIN_USER, DOCUMENT_ID, LOGGEDIN_USER_POSTS, LOGGEDIN_USER_PRIVILEGE, NORM_ID, DOCUMENT_REF_NO,DOCUMENT_STATUS, DOCUMENT,APPLICANT_USER,
NORM, CLIENT_SESSION_EXPIRED,
GININJECTOR, SCHEDULE_ID, DOCUMENT_ENTITY_TYPE,SOURCE_DOCUMENT_ID, CONFIGURATION_LIST, LOGGEDIN_USER_ID,
SOURCE_NORM_ID, MASKING_PANEL, IS_ETOKEN,
LOGGEDIN_USER_PRIVILEGE_NAMES, LOGGEDIN_USER_PRIVILEGE_IDS, IPADDRESS, AUTO_COMPLETE_SCHEDULER,
MESSAGES, DEFAULT_CERTIFICATE, DOCUMENT_FORM_MAP,DOCUMENT_FORM_FCM_MAP,DOCTYPELIST,ACCESS_RIGHT,LOGGEDIN_USER_DEFAULT_POST,LAST_LOGIN_DETAILS, DOC_STATUS_ENUM_MASTERS
,MODULE_RIGHT_ENUM_MASTERS,MODULE_RIGHT, LOGGEDIN_USER_DEFAULT_PORTAL,
LOGGEDIN_USER_DEFAULT_POST_MAP,HISTORY_CLEAR,DOC_DETAILS_PORTAL,ORGANIZATION_ID, DOCUMENT_DETAILS_FROM_JSP,PORTAL_MAP,ORGANIZATION,
CONFIGURATION_MAP, DEFAULT_SIGN_CERTIFICATE,SYSTEM_VERSION,
IS_LOGGEDIN_IN_ORGANIZATION, SUPPLIER_PORTAL_BASED_ON_URL, SUPPLIER_ORGANIZATION_BASED_ON_URL, BEFORE_LOGIN, USER_LANGUAGE, SERVER_DATE_TIME,DOCUMENTTYPE_CONFIG_TABLE;
}
SessionFacory code:
public class SessionFactory {
private static HashMap session;
public static HashMap getClientSessionInstance() {
if (session == null) {
session = new HashMap();
}
return session;
}
public static Object getValue(SessionKey key) {
return getClientSessionInstance().get(key);
}
public static void putValue(SessionKey key, Object value) {
getClientSessionInstance().put(key, value);
}
public static void remove(SessionKey key) {
getClientSessionInstance().remove(key);
}
public static void clear() {
getClientSessionInstance().remove(SessionKey.LOGGEDIN_USER);
getClientSessionInstance().remove(SessionKey.LOGGEDIN_USER_PRIVILEGE);
getClientSessionInstance().remove(SessionKey.LOGGEDIN_USER_ID);
getClientSessionInstance().remove(SessionKey.LOGGEDIN_USER_POSTS);
getClientSessionInstance().remove(SessionKey.CONFIGURATION_LIST);
getClientSessionInstance().remove(SessionKey.DOCUMENTTYPE_CONFIG_TABLE);
getClientSessionInstance().remove(SessionKey.SERVER_DATE_TIME);
getClientSessionInstance().remove(SessionKey.USER_LANGUAGE);
getClientSessionInstance().remove(SessionKey.SUPPLIER_ORGANIZATION_BASED_ON_URL);
getClientSessionInstance().remove(SessionKey.SUPPLIER_PORTAL_BASED_ON_URL);
getClientSessionInstance().remove(SessionKey.IS_LOGGEDIN_IN_ORGANIZATION);
getClientSessionInstance().remove(SessionKey.DEFAULT_SIGN_CERTIFICATE);
getClientSessionInstance().remove(SessionKey.CONFIGURATION_MAP);
getClientSessionInstance().remove(SessionKey.ORGANIZATION);
getClientSessionInstance().remove(SessionKey.LOGGEDIN_USER_DEFAULT_PORTAL);
getClientSessionInstance().remove(SessionKey.ACCESS_RIGHT);
getClientSessionInstance().remove(SessionKey.DOC_STATUS_ENUM_MASTERS);
getClientSessionInstance().remove(SessionKey.IS_ETOKEN);
getClientSessionInstance().remove(SessionKey.ORGANIZATION_ID);
getClientSessionInstance().remove(SessionKey.LAST_LOGIN_DETAILS);
getClientSessionInstance().remove(SessionKey.LOGGEDIN_USER_DEFAULT_POST);
getClientSessionInstance().remove(SessionKey.MODULE_RIGHT);
getClientSessionInstance().remove(SessionKey.MASKING_PANEL);
getClientSessionInstance().remove(SessionKey.GININJECTOR);
getClientSessionInstance().remove(SessionKey.MODULE_RIGHT_ENUM_MASTERS);
getClientSessionInstance().remove(SessionKey.LOGGEDIN_USER_DEFAULT_POST_MAP);
clearDocumentSession();
}
public static void clearDocumentSession() {
getClientSessionInstance().remove(SessionKey.DOCUMENT_ID);
getClientSessionInstance().remove(SessionKey.DOCUMENT_REF_NO);
getClientSessionInstance().remove(SessionKey.DOCUMENT_STATUS);
getClientSessionInstance().remove(SessionKey.DOCUMENT);
getClientSessionInstance().remove(SessionKey.APPLICANT_USER);
getClientSessionInstance().remove(SessionKey.NORM);
getClientSessionInstance().remove(SessionKey.NORM_ID);
getClientSessionInstance().remove(SessionKey.SCHEDULE_ID);
if(getClientSessionInstance().containsKey(SessionKey.SOURCE_DOCUMENT_ID))
getClientSessionInstance().remove(SessionKey.SOURCE_DOCUMENT_ID);
if(getClientSessionInstance().containsKey(SessionKey.SOURCE_NORM_ID))
getClientSessionInstance().remove(SessionKey.SOURCE_NORM_ID);
}
}