How to keep XML file in memory for specified period ?

Question

How to keep XML file in memory for specified period or forever, I have 5 applications running on WebSphere I wants to use XML file for all the applications. I mean when one apllication is not using XML file still I wants to keep it in memory ...
Thanx in advance ,

Answer 1

Hello,you can create a DocumentManager class,
here is my solution in the past...
you can use static Hashtable save the xml's Document,if one application want get
a appointed Document.first,you can find it from Hashtable,if can't find it ,you
can create it and put into Hashtable,if the words fail to express the meaning,sorry,my english is limited
package com.foresee.xfiles.util;
import java.util.*;
import org.w3c.dom.*;
import org.apache.log4j.*;
import com.foresee.xfiles.common.*;
import com.foresee.xfiles.server.exception.*;
import com.foresee.xfiles.util.*;
* <p>Title: </p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2002</p>
* <p>Company: </p>
* @author unascribed
* @version 1.0
public final class DocumentManager {
private static Category m_log = Category.getInstance(DocumentManager.class.getName());
static {
PropertyConfigurator.configure(Configurator.getLCF());
public DocumentManager() {
//synchronized
public static synchronized Document getTransitionDoc(String path) throws SchemaCheckOutException{
Document m_TransitionDoc;
m_TransitionDoc = (Document)TransitionDoc.get(path);
if (m_TransitionDoc == null){
XmlHelper m_xh = new XmlHelper();
try{
m_TransitionDoc = m_xh.getDocument(path);
}catch (SchemaCheckOutException se){
m_log.error("������������������������"+path+"����:"+se.getUserMsg());
throw se;
TransitionDoc.put(path,m_TransitionDoc);
return m_TransitionDoc ;
public static synchronized Document getLogicCheckDoc(String path) throws SchemaCheckOutException{
Document m_LogicCheckDoc;
m_LogicCheckDoc = (Document)LogicCheckDoc.get(path);
if (m_LogicCheckDoc == null){
XmlHelper m_xh = new XmlHelper();
try{
m_LogicCheckDoc = m_xh.getDocument(path);
}catch (SchemaCheckOutException se){
m_log.error("������������������������"+path+"����:"+se.getUserMsg());
throw se;
LogicCheckDoc.put(path,m_LogicCheckDoc);
return m_LogicCheckDoc ;
public static Hashtable TransitionDoc = new Hashtable();
public static Hashtable LogicCheckDoc = new Hashtable();