Error opening environment more than once

Question

Hi,
I have two java classes which both need to access a container in an environment (in parallel). When the first class is instantiated the environment is opened successfully. However, when the second class subsequently attempts to open the same environment I get an error. (I do not want to close the env from the first class, while the second class does its thing)
The classes are Stylesheet extensions for an xmleditor which allows the stylesheet to look up item ID codes and display their names to the user by looking up the values in an xml file stored in a bdbxml container. There is a situation where two different objects need to have access to the environment at the same time - but its giving me an error when I instantiate the env for the second time - without having closed the first one)
Any help would by gratefully received
Kind Regards
Swami Kevala
I thought I could create multiple handles to the same environment?

Answer 1

First is a class to encapsulate the environment (lifted mostly from the example code)
package org.isha.archives.bdbxml;
import java.io.*;
import java.util.*;
import com.sleepycat.db.*;
import com.sleepycat.dbxml.*;
//Class used to open and close a Berkeley DB environment
public class DbEnv
private Environment dbEnv_ = null;
private XmlManager mgr_ = null;
private boolean dbEnvIsOpen_ = false;
private File path2DbEnv_ = null;
public DbEnv(File path2DbEnv)
     throws Throwable {
          if (! path2DbEnv.isDirectory()) {
               throw new Exception(path2DbEnv.getPath() +
                         " does not exist or is not a directory.");
          EnvironmentConfig config = new EnvironmentConfig();
          config.setCacheSize(50 * 1024 * 1024);
          config.setAllowCreate(true);
          config.setInitializeCache(true);
          config.setTransactional(true);
          config.setInitializeLocking(true);
          config.setInitializeLogging(true);
          config.setErrorStream(System.err);
          config.setThreaded(true);
          config.setRunRecovery(true);
          config.setLogAutoRemove(true);
          dbEnv_ = new Environment(path2DbEnv, config);
          //Boolean used to know whether to close the environment
          // when the cleanup() method is called.
          dbEnvIsOpen_ = true;
          path2DbEnv_ = path2DbEnv;
          mgr_ = new XmlManager(dbEnv_, null);
//Returns the path to the database environment
public File getDbEnvPath() { return path2DbEnv_; }
//Returns the database environment encapsulated by this class.
public Environment getEnvironment() { return dbEnv_; }
//Returns the XmlManager encapsulated by this class.
public XmlManager getManager() { return mgr_; }
//Used to close the environment
public void cleanup() throws DatabaseException
if (dbEnvIsOpen_) {
dbEnv_.close();
dbEnvIsOpen_ = false;
Second is a class which encapsulates a container with a method for querying itself
package org.isha.archives.bdbxml;
import java.io.*;
import java.util.*;
import com.sleepycat.db.*;
import com.sleepycat.dbxml.*;
//Class used to open, query and close a Berkeley DB container
public class DbContainer
     private XmlContainer dbCont_ = null;
private XmlManager mgr_ = null;
private boolean dbContainerIsOpen_ = false;
private File path2DbContainer_ = null;
private XmlContainerConfig cfg_= null;
private String cntr_ = "";
public DbContainer(XmlManager myManager, String containerFileName, XmlContainerConfig containerConfig)
          throws Throwable {
          String containerFilepath = myManager.getHome() + "\\" + containerFileName;
          path2DbContainer_ = new File(containerFilepath);
          mgr_ = myManager;
          cfg_ = containerConfig;
          cntr_ = containerFileName;
          if (! path2DbContainer_.isFile()) {
               throw new Exception(path2DbContainer_.getPath() +
                         " does not exist or is not a directory.");
          dbCont_ = new XmlContainer();
//Return the XmlContainer itself
public XmlContainer getContainer() { return dbCont_; }
//Returns the filename of the container
     public String getFilename() { return cntr_; }
//Returns the XmlManager encapsulated by this class.
public XmlManager getManager() { return mgr_; }
//Used to close the container
public void close() throws DatabaseException
if (dbContainerIsOpen_) {
dbCont_.close();
dbContainerIsOpen_ = false;
//Used to open the container
public void open() {
          try {
               dbCont_ = mgr_.openContainer(cntr_, cfg_);
               dbContainerIsOpen_ = true;
          catch (Exception e) {
//Used to query the container
public String[] runQuery(String myQuery){
          String [] queryOutput = null;
          int counter = 0;
          try {
               XmlQueryContext context = mgr_.createQueryContext();
               //Default namespace declaration does not work yet - this will work in the next release of BDB XML
               //Until then we have to remove the namespace declaration from the reference.xml root element
               //When this becomes available we can add the namespace declaration and uncomment the following line
               //context.setNamespace("", defaultNS);
               XmlResults results = mgr_.query(myQuery, context);
               //Get the result set
               queryOutput = new String[results.size()];
               XmlValue value = results.next();
               while (value != null)
                    queryOutput[counter] = value.asString().replaceAll("\\n", "").replaceAll(" "," ");
                    System.out.println(queryOutput[counter]);
                    counter ++;
                    value = results.next();
          catch (Exception e) {
               //Exception Handling code here
          return queryOutput;
Now to explain what is happening:
When I open an xml document in xmlmind, it displays the document according to a prespecified CSS sheet. Sometimes the CSS rules alone are not sufficient to achieve the necessary effect/functionality, so the API allows you to write your own class, which contains methods to do what you want. As soon as the xml document is displayed, the CSS extension class gets instantiated.
Here is my extension class (called StyleSheetExtension). It contains a method called getKeywords. This method can then be invoked from within the CSS sheet, and is used to replace the keyword ID codes in the xml document with their corresponding keyword names - stored in an xml reference look-up document...
package org.isha.archives.xmlmind;
import com.xmlmind.xmledit.xmlutil.*;
import com.xmlmind.xmledit.doc.*;
import com.xmlmind.xmledit.view.DocumentView;
import com.xmlmind.xmledit.stylesheet.StyleValue;
import com.xmlmind.xmledit.stylesheet.StyleSpec;
import com.xmlmind.xmledit.stylesheet.StyleSpecsBase;
import com.xmlmind.xmledit.styledview.StyledViewFactory;
import com.xmlmind.xmledit.styledview.CustomViewManager;
import com.sleepycat.dbxml.*;
import com.sleepycat.db.*;
import java.io.File;
import java.util.logging.*;
import java.util.*;
import org.isha.archives.bdbxml.DbContainer;
import org.isha.archives.bdbxml.DbEnv;
public class StyleSheetExtension {
     //Logging variables
     private Logger logger = Logger.getLogger("StyleSheetExtension");
     private Handler fh = null;
     private java.util.logging.Formatter sf = null;
     //XMLMind variables
     private static final Namespace NS = Namespace.get("http://www.ishafoundation.org/archives/schema/transcript");
     //BDB variables
     private DbEnv myDbEnv = null;
     private File envDir = new File("C:\\BerkeleyDB");
     private DbContainer myDbContainer = null;
     private String containerFileName = "reference.dbxml";
     private XmlContainerConfig containerCfg = null;
     //Define Constructor
     public StyleSheetExtension(String[] args, StyledViewFactory viewFactory) {
//Set up simple logging system
try {
fh = new FileHandler("%t/_styleSheetExtn.log");
sf = new SimpleFormatter();
fh.setFormatter(sf);
logger.addHandler(fh);
logger.setLevel(Level.ALL);
logger.info("Starting StyleSheetExtension Class constructor");
} catch (Exception e)
{System.out.println("CustomErr: " + e.getMessage());
                //Exception Handling code
//Create custom BDB Environment and Container Objects
try {
                    myDbEnv = new DbEnv(envDir);
                    containerCfg = new XmlContainerConfig();
                    myDbContainer = new DbContainer(myDbEnv.getManager(), containerFileName, containerCfg);
                    myDbContainer.open();
               } catch (Throwable t) {
                    logger.severe("Problem with Env or Container new thing");
viewFactory.addDependency( NS, "topic", NS, "keywordIDs");
     public StyleValue getKeywords (StyleValue[] args, Node contextNode,
                         StyledViewFactory viewFactory) {
//Get keyword IDs as a String array
String[] keywordID = null;
String[] keywordValue = null;
String keywordIDStr = "";
String keywordValueStr ="";
Name keywordIDs = Name.get("keywordIDs");
keywordIDStr = contextNode.attributeValue(keywordIDs).trim();
keywordID = keywordIDStr.split("\\s+");
keywordValue = new String[keywordID.length];
//for each keyword ID element retrieve the corresponding keyword value
logger.info("getting values");
               keywordValue = getKeywordValuesFromDB(keywordID);
               Arrays.sort(keywordValue);
               logger.info(keywordValue[0] + " " + keywordValue[1]);
               int i = 0;
               for(i=0; i < keywordID.length; i++) {
                    keywordValueStr += keywordValue[i] + " ";
               keywordValueStr = keywordValueStr.trim();
          return StyleValue.createString(keywordValueStr);
private String[] getKeywordValuesFromDB(String[] IDs){
               String[] values = new String[IDs.length];
               String id = "";
               String value = "";
               String flwor = "";
               int i = 0;
               for(i=0; i < IDs.length; i++) {
                    id = IDs.trim();
                    flwor = "for $i in collection('" + myDbContainer.getFilename() + "') /reference/keywords/keyword \n";
                    flwor += "let $id := $i/@id/text() \n";
                    flwor += "let $val := $i/@value/text() \n";
                    flwor += "where $id = '" + id + "'\n";
                    flwor += "return $val";
                    String[] temp = new String[1];
                    temp = myDbContainer.runQuery(flwor);
                    values[i] = temp[0];
                    logger.info("value is: " + values[i]);
               return values;
package org.isha.archives.xmlmind;
import com.xmlmind.xmledit.xmlutil.*;
import com.xmlmind.xmledit.doc.*;
import com.xmlmind.xmledit.view.DocumentView;
import com.xmlmind.xmledit.stylesheet.StyleValue;
import com.xmlmind.xmledit.stylesheet.StyleSpec;
import com.xmlmind.xmledit.stylesheet.StyleSpecsBase;
import com.xmlmind.xmledit.styledview.StyledViewFactory;
import com.xmlmind.xmledit.styledview.CustomViewManager;
import com.sleepycat.dbxml.*;
import com.sleepycat.db.*;
import java.io.File;
import java.util.logging.*;
import java.util.*;
import org.isha.archives.bdbxml.DbContainer;
import org.isha.archives.bdbxml.DbEnv;
public class StyleSheetExtension {
     //Logging variables
     private Logger logger = Logger.getLogger("StyleSheetExtension");
     private Handler fh = null;
     private java.util.logging.Formatter sf = null;
     //XMLMind variables
     private static final Namespace NS = Namespace.get("http://www.ishafoundation.org/archives/schema/transcript");
     //BDB variables
     private DbEnv myDbEnv = null;
     private File envDir = new File("C:\\BerkeleyDB");
     private DbContainer myDbContainer = null;
     private String containerFileName = "reference.dbxml";
     private XmlContainerConfig containerCfg = null;
     //Define Constructor
     public StyleSheetExtension(String[] args, StyledViewFactory viewFactory) {
//Set up simple logging system
try {
fh = new FileHandler("%t/_styleSheetExtn.log");
sf = new SimpleFormatter();
fh.setFormatter(sf);
logger.addHandler(fh);
logger.setLevel(Level.ALL);
logger.info("Starting StyleSheetExtension Class constructor");
} catch (Exception e)
{System.out.println("CustomErr: " + e.getMessage());
                //Exception Handling code
//Create custom BDB Environment and Container Objects
try {
                    myDbEnv = new DbEnv(envDir);
                    containerCfg = new XmlContainerConfig();
                    myDbContainer = new DbContainer(myDbEnv.getManager(), containerFileName, containerCfg);
                    myDbContainer.open();
               } catch (Throwable t) {
                    logger.severe("Problem with Env or Container new thing");
viewFactory.addDependency( NS, "topic", NS, "keywordIDs");
     public StyleValue getKeywords (StyleValue[] args, Node contextNode,
                         StyledViewFactory viewFactory) {
//Get keyword IDs as a String array
String[] keywordID = null;
String[] keywordValue = null;
String keywordIDStr = "";
String keywordValueStr ="";
Name keywordIDs = Name.get("keywordIDs");
keywordIDStr = contextNode.attributeValue(keywordIDs).trim();
keywordID = keywordIDStr.split("\\s+");
keywordValue = new String[keywordID.length];
//for each keyword ID element retrieve the corresponding keyword value
logger.info("getting values");
               keywordValue = getKeywordValuesFromDB(keywordID);
               Arrays.sort(keywordValue);
               logger.info(keywordValue[0] + " " + keywordValue[1]);
               int i = 0;
               for(i=0; i < keywordID.length; i++) {
                    keywordValueStr += keywordValue[i] + " ";
               keywordValueStr = keywordValueStr.trim();
          return StyleValue.createString(keywordValueStr);
private String[] getKeywordValuesFromDB(String[] IDs){
               String[] values = new String[IDs.length];
               String id = "";
               String value = "";
               String flwor = "";
               int i = 0;
               for(i=0; i < IDs.length; i++) {
                    id = IDs[i].trim();
                    flwor = "for $i in collection('" + myDbContainer.getFilename() + "') /reference/keywords/keyword \n";
                    flwor += "let $id := $i/@id/text() \n";
                    flwor += "let $val := $i/@value/text() \n";
                    flwor += "where $id = '" + id + "'\n";
                    flwor += "return $val";
                    String[] temp = new String[1];
                    temp = myDbContainer.runQuery(flwor);
                    values[i] = temp[0];
                    logger.info("value is: " + values[i]);
               return values;
This instance (and consequently the newly created env and container objects) stay alive until the document is closed.
The xmlmind API also allows you to specify custom classes that will return a component that can be embedded in the stylesheet. (My class returns a JButton which - when clicked - brings up a dialog box which allows the user to specify /modify/addnew keywords to the selected text). As soon as the button is pressed I create a new env and container instance, for the duration of the pop-up window (since I have no way to pass the reference to the existing environment created by the StyleSheetExtension class.
Here's the class defn: (Here goes!) The env and container stuff is at the start of the nested-nested class called KpForm.
package org.isha.archives.xmlmind;
import com.sleepycat.dbxml.*;
import com.sleepycat.db.*;
import java.awt.*;
import java.io.*;
import javax.swing.*;
import javax.swing.text.AttributeSet;
import javax.swing.text.AbstractDocument;
import javax.swing.text.DocumentFilter;
import javax.swing.text.BadLocationException;
import javax.swing.event.*;
import javax.swing.text.DocumentFilter.FilterBypass;
import java.util.*;
import java.util.regex.*;
import java.lang.*;
import com.xmlmind.xmledit.xmlutil.*;
import com.xmlmind.xmledit.doc.Element;
import com.xmlmind.xmledit.edit.*;
import com.xmlmind.xmledit.stylesheet.*;
import com.xmlmind.xmledit.styledgadget.*;
import com.xmlmind.xmledit.styledview.*;
import com.xmlmind.xmledit.doc.*;
import java.util.logging.*;
import org.isha.archives.bdbxml.DbEnv;
import org.isha.archives.bdbxml.DbContainer;
public class OpenKeywordPicker implements ComponentFactory {
public Component createComponent(Element element,
Style style, StyleValue[] parameters,
StyledViewFactory viewFactory,
boolean[] stretch){
KeywordEdit topic = new KeywordEdit();
return topic;
     private class KeywordEdit extends JButton {
          //private Element element;
          public KeywordEdit()
               super.setText("Edit");
               super.addMouseListener(new java.awt.event.MouseAdapter() {
                              public void mouseClicked(java.awt.event.MouseEvent evt) {
                                   myJButtonMouseClicked(evt);
          private void myJButtonMouseClicked(java.awt.event.MouseEvent evt) {
                    KpForm myForm = new KpForm();
                    myForm.setVisible(true);
private class KpForm extends javax.swing.JFrame {
     // Variables declaration - do not modify
     private javax.swing.JButton jButton1;
     private javax.swing.JButton jButton2;
     private javax.swing.JButton jButton3;
     private javax.swing.JButton jButton4;
     private javax.swing.JButton jButton5;
     private javax.swing.JButton jButton6;
     private javax.swing.JLabel jLabel1;
     private javax.swing.JLabel jLabel2;
     private javax.swing.JLabel jLabel3;
     private javax.swing.JLabel jLabel4;
     private javax.swing.JLabel jLabel5;
     private javax.swing.JList jList1;
     private javax.swing.JList jList2;
     private javax.swing.JList jList3;
     private javax.swing.JScrollPane jScrollPane1;
     private javax.swing.JScrollPane jScrollPane2;
     private javax.swing.JScrollPane jScrollPane3;
     private javax.swing.JScrollPane jScrollPane4;
     private javax.swing.JTextArea jTextArea1;
     private javax.swing.JTextField jTextField1;
     private DefaultListModel model_1 = new DefaultListModel();
          private DefaultListModel model_2 = new DefaultListModel();
          private DefaultListModel model_3 = new DefaultListModel();
          private javax.swing.JOptionPane jOptionPane1;
          //private KeywordFilter filter_1 = new KeywordFilter();
          //BDB variables
          private DbEnv myDbEnv = null;
          private File envDir = new File("C:\\BerkeleyDB");
          private DbContainer myDbContainer = null;
          private String containerFileName = "reference.dbxml";
          private XmlContainerConfig containerCfg = null;
          private Logger logger = Logger.getLogger("OpenKeywordPicker.KeywordEdit.KpForm");
          private Handler fh = null;
          private java.util.logging.Formatter sf = null;
// End of variables declaration
     /** Creates new form kpForm */
     public KpForm() {
               super();
     initComponents();
     customInit();
          private void customInit(){
                    //Set up simple logging system
               try {
                    fh = new FileHandler("%t/_keywordPicker.log");
                    sf = new SimpleFormatter();
                    fh.setFormatter(sf);
                    logger.addHandler(fh);
                    logger.setLevel(Level.ALL);
                    logger.info("Starting Custom initialization");
               } catch (Exception e) {System.out.println("CustomErr: " + e.getMessage());
                          //Exception Handling code
                    //Create custom BDB Environment and Container Objects
                    try {
                         logger.info("0");
                         myDbEnv = new DbEnv(envDir);
                         logger.info("1");
                         containerCfg = new XmlContainerConfig();
                         logger.info("2");
                         myDbContainer = new DbContainer(myDbEnv.getManager(), containerFileName, containerCfg);
                         logger.info("3");
                         myDbContainer.open();
                    } catch (Throwable t) {
                         logger.severe("Problem with Env or Container new thing - Component: "+ t.getMessage());
          String[] dbIDKeywords;
          jList1.setModel(model_1);
          jList2.setModel(model_2);
          jList3.setModel(model_3);
          dbIDKeywords = getKeywordsFromDB();
          int i=0;
          for(i=0; i < dbIDKeywords.length; i+=2){
          model_1.addElement(new keywordOb(dbIDKeywords[i], dbIDKeywords[i+1]));
          jList1.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
          jList2.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
          jList3.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
          //Setup Document Filter for TextField component
          AbstractDocument doc;
          doc = (AbstractDocument)(jTextField1.getDocument());
          doc.setDocumentFilter(filter_1);
          //Setup Document Listener for TextField component
          jTextField1.getDocument().addDocumentListener(new DocumentListener(){
          public void insertUpdate(DocumentEvent e) {
          String val = jTextField1.getText();
          if(val != null & val.trim() != ""){
          jButton1.setEnabled(true);
          else {
          jButton1.setEnabled(false);
          public void removeUpdate(DocumentEvent e) {
          String val = jTextField1.getText();
          if(val != null & !val.trim().equals("")){
          jButton1.setEnabled(true);
          else {
          jButton1.setEnabled(false);
          public void changedUpdate(DocumentEvent e) {
          //Plain text components do not fire these events
          private String[] getKeywordsFromDB(){
          String[] k = null;
          String flwor = "";
          flwor = "for $i in collection('" + containerFileName + "') /reference/keywords/keyword \n";
          flwor += "let $id := $i/@id/text() \n";
          flwor += "let $val := $i/@value/text() \n";
          flwor += "order by $val ascending \n";
          flwor += "return ($id, $val)";
          return k = myDbContainer.runQuery(flwor);
          private class keywordOb implements Comparable{
          private String id;
          private String value;
          public keywordOb(String id, String value){
          this.id = id;
          this.value = value;
          public String getId(){
          return id;
          public String getValue(){
          return value;
          public String toString(){
          return value;
          public int compareTo(Object o){
                              int result = (((keywordOb)this).toString()).compareTo(((keywordOb)o).toString());
                              return result;
          private class questionOb implements Comparable{
          private String id;
          private String value;
          private String[] keywordRefs;
          public questionOb(String id, String value, String[] keywordRefs){
          this.id = id;
          this.value = value;
          this.keywordRefs = keywordRefs;
          public questionOb(){
          this.id = "";
          this.value = "";
          this.keywordRefs = null;
          public String getId(){
          return id;
          public String getValue(){
          return value;
          public String toString(){
          return value;
          public String[] getKeywordRefs(){
          return keywordRefs;
          public void setId(String id){
          this.id = id;
          public void setValue(String value){
          this.value = value;
          public void setKeywordRefs(String[] keywords){
          this.keywordRefs = keywordRefs;
          public int compareTo(Object o){
                         int result = (((questionOb)this).toString()).compareTo(((questionOb)o).toString());
                         return result;
          //Add New Keyword to xml reference File
          private void addNewKeyword(String k){
          String keyword = k;
          int len = jTextField1.getDocument().getLength();
          //Tidy up string
          keyword = keyword.trim();
          keyword = keyword.replaceAll("\\s+"," ");
          keyword = capitalizeWords(keyword);
          String flwor = "";
          //Check that the keyword value doesn't already exist
          flwor = "let $i := collection('" + containerFileName + "')/reference/keywords/keyword[@value = '" + keyword + "'] \n";
          flwor += "return \n";
          flwor += "if(count($i)) then fn:true() \n";
          flwor += "else fn:false() \n";
          boolean keywordExists = bDbConnection.runBooleanQuery(flwor);
          if (keywordExists){
          jOptionPane1.showMessageDialog(new Frame(),
          "The keyword '" + keyword + "' already exists", "Message", jOptionPane1.INFORMATION_MESSAGE);
          try {
          jTextField1.getDocument().remove(0,len);
          } catch (Exception ex) {
          ex.printStackTrace();
          //Terminate method execution
          return;
          //Need to get ID of last keyword
          flwor = "for $i in collection('" + containerFileName + "')/reference/keywords/keyword/@id/text() \n";
          flwor += "order by $i descending \n";
          flwor += "return $i[fn:last()]";
          String[] lastIDArray = new String[1];
          lastIDArray = bDbConnection.runQuery(flwor);
          String lastIDStr = lastIDArray[0];
          //create incremented ID value
          //Note: XML ID attributes must start with a letter - that's why we need to do all this nonsense!
          int lastIDNum = new Integer(lastIDStr.substring(1));
          int nextIDNum = ++lastIDNum;
          String nextIDStr = String.format("%04d", nextIDNum);
          nextIDStr = "K" + nextIDStr;
          //OK Finally - actually add the keyword to the xml reference file
          //use BDB API for updating - since XQuery does not allow
          try
          XmlQueryContext qc = myManager.createQueryContext();
          XmlUpdateContext uc = myManager.createUpdateContext();
          XmlModify mod = myManager.createModify();
          XmlQueryExpression select = myManager.prepare("/reference/keywords", qc);
          mod.addAppendStep(select, XmlModify.Element, "keyword", "");
          select = myManager.prepare("/reference/keywords/keyword[fn:last()]", qc);
          mod.addAppendStep(select, XmlModify.Attribute, "id", nextIDStr);
          mod.addAppendStep(select, XmlModify.Attribute, "value", keyword);
          XmlDocument updateDoc = myContainer.getDocument(docName);
          XmlValue docValue = new XmlValue(updateDoc);
          mod.execute(docValue, qc, uc);
          catch(Exception e){
          System.out.println("Error adding keyword: " + e.getMessage());
          //Add the new keyword to the list of selected keywords
          model_2.addElement(keyword);
          sortModelElements(model_2);
          try {
          jTextField1.getDocument().remove(0,len);
          } catch (Exception ex) {
          ex.printStackTrace();
          private questionOb[] getQuestionsFromDB(keywordOb[] keywordIDs){
          questionOb[] qobs = null;
          String seq = "";
          String flwor = "";
          int num = 0;
          seq = keywordObsToSeq(keywordIDs);
          flwor = "for $i in " + seq + "\n";
          flwor += "let $q := collection('" + containerFileName + "') /reference/questions/question[./keywordRef/@idref/text() = $i] \n";
          flwor += "return $q";
          try
          XmlQueryContext context = myManager.createQueryContext();
          context.setEvaluationType(XmlQueryContext.Eager);
          context.setReturnType(XmlQueryContext.DeadValues);
          XmlResults results = myManager.query(flwor, context);
          // Report Query Info
          String message = "Found ";
          message += results.size() + " entries for query: '";
          message += flwor + "'\n";
          System.out.println(message);
          int numQuestions;
          numQuestions = results.size();
          qobs = new questionOb[numQuestions];
          String[] keyRefs = new String[1];
          String[] keyRefs2 = new String[1];
          XmlResults atts, atts2 = null;
          XmlValue keyRefElem, keyRefAtt = null;
          int i;
          for(i=0; i < numQuestions; i++){
          XmlValue val = results.next();
          atts = val.getAttributes();
          String id = atts.next().getNodeValue();
          String value = atts.next().getNodeValue();
          keyRefElem = val.getFirstChild();
          int j=0;
          while (!keyRefElem.isType(XmlValue.NONE)){
          if(keyRefElem.getType() == XmlValue.TEXT_NODE){
          keyRefElem = keyRefElem.getNextSibling();
          if(keyRefElem.isType(XmlValue.NONE)){
          break;
          System.out.println("1");
          atts2 = keyRefElem.getAttributes();
          System.out.println("2");
          keyRefs[j] = atts2.next().getNodeValue();
          System.out.println("3" + keyRefs[j]);
          System.arraycopy(keyRefs,0,keyRefs2,0,j+1);
          System.out.println("4");
          keyRefs = new String[j+2];
          System.out.println("5");
          System.arraycopy(keyRefs2,0,keyRefs,0,j+1);
          System.out.println("6");
          keyRefs2 = new String[j+2];
          System.out.println("7");
          keyRefElem = keyRefElem.getNextSibling();
          System.out.println("8");
          j++;
          System.out.println(keyRefs[0]+keyRefs[1]);
          //Create new Question Object with retrieved values
          System.out.println("bef");
          questionOb qo = new questionOb(id, value, keyRefs);
          System.out.println("aft");
          qobs[i] = qo;
                    catch(Exception e)
          System.out.println("XML Exception is "+ e.getMessage());
          return qobs;
          private void sortModelElements(DefaultListModel model){
          //Getting the size of the model
          int size = model.getSize();
          //Creating the keyword object based on the size of the model
          keywordOb[] word = new keywordOb[size];
          int i=0;
          //keywordOb j;
          for(i=0; i < size; i++){
          word[i] = (keywordOb) model.getElementAt(i);
          Arrays.sort(word);
          for(i=0; i < size; i++){
          //model.setElementAt(word[i], i);
          model.set(i,word[i]);
          public void messageBox(String message)
          jOptionPane1.showMessageDialog(new Frame(), message , "Message", jOptionPane1.INFORMATION_MESSAGE);
          class KeywordFilter extends DocumentFilter {
          public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr)
          throws BadLocationException {
          int len = fb.getDocument().getLength();
          if(len==0 & noFunnyChars(string) & !string.trim().equals("")){
          fb.insertString(offset, string, attr);
          if(len > 0 & noFunnyChars(string) & len < 30){
          fb.insertString(offset, string, attr);
          public void replace(FilterBypass fb, int offset, int length, String string, AttributeSet attr)
          throws BadLocationException {
          int len = fb.getDocument().getLength();
          if(len==0 & noFunnyChars(string) & !string.trim().equals("")){
          fb.replace(offset, length, string, attr);
          if(len > 0 & noFunnyChars(string) & len < 30){
          fb.insertString(offset, string, attr);
          private boolean noFunnyChars(String s){
          String regex = "[A-Za-z\\s]+";
          boolean b = Pattern.matches(regex, s);
          return b;
          private String capitalizeWords(String s){
          String s2;
          char[] c = s.toCharArray();
          int i = 0;
          c[0] = Character.toUpperCase(c[0]);
          for(i=0; i < c.length; i++){
          if (!Character.isLetter(c[i])){
          c[i+1] = Character.toUpperCase(c[i+1]);
          s2 = String.valueOf(c);
          return s2;
          private String keywordObsToSeq(keywordOb[] a) {
          StringBuffer result = new StringBuffer();
          String resultStr = "";
          result.append("('" + a[0].getId() + "', ");
          for (int i=1; i < a.length; i++) {
          result.append("'" + a[i].getId() + "', ");
          resultStr = result.toString();
          resultStr = resultStr.trim();
          resultStr = resultStr.substring(0,resultStr.length()-1) + ")";
          return resultStr;
     // <editor-fold defaultstate="collapsed" desc=" Generated Code ">
          private void initComponents() {
          jScrollPane1 = new javax.swing.JScrollPane();
          jList1 = new javax.swing.JList();
          jScrollPane2 = new javax.swing.JScrollPane();
          jList2 = new javax.swing.JList();
          jLabel1 = new javax.swing.JLabel();
          jLabel2 = new javax.swing.JLabel();
          jLabel3 = new javax.swing.JLabel();
          jTextField1 = new javax.swing.JTextField();
          jButton1 = new javax.swing.JButton();
          jButton2 = new javax.swing.JButton();
          jButton3 = new javax.swing.JButton();
          jScrollPane3 = new javax.swing.JScrollPane();
          jList3 = new javax.swing.JList();
          jLabel4 = new javax.swing.JLabel();
          jButton4 = new javax.swing.JButton();
          jButton5 = new javax.swing.JButton();
          jLabel5 = new javax.swing.JLabel();
          jScrollPane4 = new javax.swing.JScrollPane();
          jTextArea1 = new javax.swing.JTextArea();
          jButton6 = new javax.swing.JButton();
          setDefaultCloseOperation(javax.swing.WindowConstants.DO_NOTHING_ON_CLOSE);
          jList1.addMouseListener(new java.awt.event.MouseAdapter() {
          public void mouseClicked(java.awt.event.MouseEvent evt) {
          jList1MouseClicked(evt);
          jScrollPane1.setViewportView(jList1);
          jList2.addMouseListener(new java.awt.event.MouseAdapter() {
          public void mouseClicked(java.awt.event.MouseEvent evt) {
          jList2MouseClicked(evt);
          jScrollPane2.setViewportView(jList2);
          jLabel1.setText("Available Keywords");
          jLabel2.setText("Selected Keywords");
          jLabel3.setText("Add New Keyword");
          jTextField1.setFont(new java.awt.Font("Tahoma", 0, 12));
          jTextField1.addActionListener(new java.awt.event.ActionListener() {
          public void actionPerformed(java.awt.event.ActionEvent evt) {
          jTextField1ActionPerformed(evt);
          jButton1.setText("Add Keyword");
          jButton1.setEnabled(false);
          jButton1.addActionListener(new java.awt.event.ActionListener() {
          public void actionPerformed(java.awt.event.ActionEvent evt) {
          jButton1ActionPerformed(evt);
          jButton2.setText("Modify Keyword");
          jButton3.setText("Remove Keyword");
          jList3.setModel(new javax.swing.AbstractListModel() {
          String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
          public int getSize() { return strings.length; }
          public Object getElementAt(int i) { return strings[i]; }
          jScrollPane3.setViewportView(jList3);
          jLabel4.setText("Questions");
          jButton4.setText("OK");
          jButton4.addActionListener(new java.awt.event.ActionListener() {
          public void actionPerformed(java.awt.event.ActionEvent evt) {
          jButton4ActionPerformed(evt);
          jButton5.setText("Cancel");
          jLabel5.setText("Add New Question");
          jTextArea1.setColumns(20);
          jTextArea1.setRows(2);
          jScrollPane4.setViewportView(jTextArea1);
          jButton6.setText("Add Question");
          javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
          getContentPane().setLayout(layout);
          layout.setHorizontalGroup(
          layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
          .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
          .addContainerGap(488, Short.MAX_VALUE)
          .addComponent(jButton5)
          .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
          .addComponent(jButton4, javax.swing.GroupLayout.PREFERRED_SIZE, 65, javax.swing.GroupLayout.PREFERRED_SIZE)
          .addGap(29, 29, 29))
          .addGroup(layout.createSequentialGroup()
          .addGap(38, 38, 38)
          .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
          .addGroup(layout.createSequentialGroup()
          .addComponent(jButton6)
          .addContainerGap())
          .addGroup(layout.createSequentialGroup()
          .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
          .addComponent(jScrollPane4, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 559, Short.MAX_VALUE)
          .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
          .addComponent(jLabel5)
          .addComponent(jLabel4)
          .addGroup(layout.createSequentialGroup()
          .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
          .addComponent(jLabel1)
          .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 148, javax.swing.GroupLayout.PREFERRED_SIZE))
          .addGap(31, 31, 31)
          .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
          .addComponent(jLabel2)
          .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 152, javax.swing.GroupLayout.PREFERRED_SIZE))
          .addGap(32, 32, 32)
          .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
          .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 155, javax.swing.GroupLayout.PREFERRED_SIZE)
          .addComponent(jLabel3)
          .addComponent(jButton1)
          .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
          .addComponent(jButton2, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
          .addComponent(jButton3, javax.swing.GroupLayout.Alignment.LEADING))))
          .addComponent(jScrollPane3, javax.swing.GroupLayout.DEFAULT_SIZE, 559, Short.MAX_VALUE)))
          .addContainerGap(58, Short.MAX_VALUE))))
          layout.setVerticalGroup(
          layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
          .addGroup(layout.createSequentialGroup()
          .addGap(24, 24, 24)
          .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
          .addGroup(layout.createSequentialGroup()
          .addComponent(jLabel1)
          .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
          .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 146, javax.swing.GroupLayout.PREFERRED_SIZE))
          .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
          .addGroup(layout.createSequentialGroup()
          .addComponent(jLabel2)
          .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
          .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 146, javax.swing.GroupLayout.PREFERRED_SIZE))
          .addGroup(layout.createSequentialGroup()
          .addComponent(jLabel3)
          .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
          .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
          .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
          .addComponent(jButton1)
          .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
          .addComponent(jButton2)
          .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
          .addComponent(jButton3))))
          .addGap(29, 29, 29)
          .addComponent(jLabel4)
          .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
          .addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, 185, javax.swing.GroupLayout.PREFERRED_SIZE)
          .addGap(20, 20, 20)
          .addComponent(jLabel5)
          .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
          .addComponent(jScrollPane4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
          .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
          .addComponent(jButton6)
          .addGap(31, 31, 31)
          .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
          .addComponent(jButton4)
          .addComponent(jButton5))
          .addGap(21, 21, 21))
          pack();
}// </editor-fold>
          //Event handlers
          private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {
          // TODO add your handling code here:
                    try {
                         myDbContainer.close();
                         myDbEnv.cleanup();
                    } catch (Exception e) {
                         logger.info("Could not close container/or env - Component");
                    super.setVisible(false);
                    super.dispose();
               private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {
          // TODO add your handling code here:
                    String val;
                    val = jTextField1.getText();
                    if(val != null & val.trim() != "" & noFunnyChars(val) ){
                         jButton1.setEnabled(true);
                    else {
                         jButton1.setEnabled(false);
               private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
          // TODO add your handling code here:
               // Add new keyword to the xml reference file
                    //addNewKeyword(jTextField1.getText());
               private void jList2MouseClicked(java.awt.event.MouseEvent evt) {
          // TODO add your handling code here:
                    if(evt.getClickCount() == 2) {
                         keywordOb k = (keywordOb)jList2.getSelectedValue();
                         model_2.removeElement(k);
                         model_1.addElement(k);
                         sortModelElements(model_1);
                         questionOb q = null;
                         //Remove associated questions from listbox
                         int i,j;
                         for(i=0; i < model_3.size(); i++){
                              q = (questionOb)model_3.getElementAt(i);
                              for(j=0; j < model_3.size(); j++){
                                   if (q.getKeywordRefs()[j].equals(k.getId())){
                                        model_3.removeElement(q);
                                        i--;
                                        break;
               private void jList1MouseClicked(java.awt.event.MouseEvent evt) {
          // TODO add your handling code here:
               if(evt.getClickCount() == 2) {
                         //Getting properties of the selecteditem item in jList1.
                    keywordOb k = (keywordOb)jList1.getSelectedValue();
                    //Removing the element from jList1
                    model_1.removeElement(k);
                    //Adding the element to jList2
                    model_2.addElement(k);
                    sortModelElements(model_2);
                    //Load the questions for the selected keywords
                    int len;
                    len = model_2.getSize();
                    keywordOb[] dbQuestionsOb = new keywordOb[5];
                    keywordOb[] selectedKeywordsOb = new keywordOb[len];
                    String[] selectedKeywordIDs = new String[len];
                    int i;
                    for(i=0; i < len; i++) {
                         selectedKeywordsOb[i] = (keywordOb)model_2.getElementAt(i);
                         selectedKeywordIDs[i] = selectedKeywordsOb[i].getId();
                    questionOb[] questionsOb = getQuestionsFromDB(selectedKeywordsOb);
                    model_3.removeAllElements();
                    for(i=0; i < questionsOb.length; i++){
                         model_3.addElement(questionsOb[i]);
                    // sortModelElements(model_3);
I think thats too much code for one post!