I have the tutorial running with a entire database displayed.
I am working with the tutorial at:
http://www.netbeans.org/kb/articles/mysql.html

The above tutorial creates a jDesktopAPP. with components bound to the table.

I am trying to add a button (basically).

I am in the process of understanding binding.

the program loads with <list> which is the entire database.

I created a new query (createQuery())

I would like to clear that list and repoulate it with a getResultSet()

As far as binding goes I have never acessed propertiest to set them or accessed properties

to work with them.

Could some one give me some idea where to start?

I have coded in a combobox,textfield,button(@Action)and actionPerformed()
Right now everything compiles yet the query is not created.

Can someone tell me some basic procedures I must follow to utilize persistence?

All this code does is add the above mentioned components and I added an error message to

try to put my question into context.
Thank for your time.

private void searchJComboBox1ItemStateChanged(java.awt.event.ItemEvent evt) {               

                                   
    setSearchItem((String) searchJComboBox1.getSelectedItem());
    if (searchJComboBox1.getSelectedItem().equals("by Artist")) {
        String holdQuery = searchJComboBox1.getSelectedItem().toString();
        setSearchInput(holdQuery);

    //searchJTextField1.setText(getSearchQuery());
    }
    if (searchJComboBox1.getSelectedItem().equals("by Song")) {
        String holdQuery = searchJComboBox1.getSelectedItem().toString();
        setSearchInput(holdQuery);

    //searchJTextField1.setText(getSearchQuery());
    }
}                                                 

private void searchJButton1ActionPerformed(java.awt.event.ActionEvent evt) {                

                               
    if (searchJComboBox1.getSelectedItem().equals("by Artist")) {
        String like = searchJTextField1.getText();
        setSearchQueryString("SELECT c FROM content c WHERE c.artist LIKE :like");
        searchQuery1 = entityManager.createQuery(getSearchQueryString());
        searchQuery1.setParameter("like", "%" + searchJTextField1.getText() + "%");
        List<Content> List = searchQuery1.getResultList();
    }
     if (searchJComboBox1.getSelectedItem().equals("by Song")) {
        String like = searchJTextField1.getText();
        setSearchQueryString("SELECT c FROM content c WHERE c.song LIKE :like");
        searchQuery1 = entityManager.createQuery(getSearchQueryString());
        searchQuery1.setParameter("like", "%" + searchJTextField1.getText() + "%");
        List<Content> List = searchQuery1.getResultList();
    }
}                                              

    @Action
    public Task searchSplash() {


        return new SearchSplashTask(getApplication());
    }

    private class SearchSplashTask extends Task {

        SearchSplashTask(org.jdesktop.application.Application app) {
            super(app);
        }

        @SuppressWarnings("unchecked")
        @Override
        protected Void doInBackground() {
            try {
                setProgress(0, 0, 4);
                setMessage("Rolling back the current changes...");
                setProgress(1, 0, 4);
                entityManager.getTransaction().rollback();
                Thread.sleep(1000L); // remove for real app

                setProgress(2, 0, 4);

                setMessage("Starting a new transaction...");
                entityManager.getTransaction().begin();
                Thread.sleep(500L); // remove for real app

                setProgress(3, 0, 4);

                setMessage("Fetching new data...");
                java.util.Collection data = searchQuery1.getResultList();


                for (Object entity : data) {
                    entityManager.refresh(entity);
                }

                Thread.sleep(1300L); // remove for real app

                setProgress(4, 0, 4);

                Thread.sleep(150L); // remove for real app

                list.clear();
            //list.addAll(search);
            } catch (InterruptedException ignore) {
            }
            return null;
        }

        @Override
        protected void finished() {
            setMessage("Done.");
            setSaveNeeded(false);
        }
    }
entityManager = java.beans.Beans.isDesignTime() ? null : 

javax.persistence.Persistence.createEntityManagerFactory

("splashbookdbPU").createEntityManager();
        org.jdesktop.application.ResourceMap resourceMap = 

org.jdesktop.application.Application.getInstance

(splashtemplateda.SplashTemplateDAApp.class).getContext().getResourceMap

(SplashTemplateDAView.class);
        query = java.beans.Beans.isDesignTime() ? null : entityManager.createQuery

(resourceMap.getString("query.query")); // NOI18N
        list = java.beans.Beans.isDesignTime() ? java.util.Collections.emptyList() : 

org.jdesktop.observablecollections.ObservableCollections.observableList

(query.getResultList());
        searchQuery1 = java.beans.Beans.isDesignTime() ? null : entityManager.createQuery

(null);
init:
deps-jar:
Copying 1 file to 

C:\Users\depot\Documents\ceyesuma\program_cache\in_progress\Enterprise\splashbookinprogress

\target\SplashTemplateDA\build\classes
compile:
run:
[TopLink Info]: 2008.05.12 05:49:17.417--ServerSession(25094328)--TopLink, version: Oracle 

TopLink Essentials - 2.0.1 (Build b09d-fcs (12/06/2007))
[TopLink Info]: 2008.05.12 05:49:19.438--ServerSession(25094328)--

file:/C:/Users/depot/Documents/ceyesuma/program_cache/in_progress/Enterprise/splashbookinpr

ogress/target/SplashTemplateDA/build/classes/-splashbookdbPU login successful
May 12, 2008 5:49:20 PM org.jdesktop.application.Application$1 run
SEVERE: Application class splashtemplateda.SplashTemplateDAApp failed to launch
java.lang.IllegalArgumentException: An exception occured while creating a query in 

EntityManager
        at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerImpl.createQuery

(EntityManagerImpl.java:209)
        at splashtemplateda.SplashTemplateDAView.initComponents

(SplashTemplateDAView.java:360)
        at splashtemplateda.SplashTemplateDAView.<init>(SplashTemplateDAView.java:42)
        at splashtemplateda.SplashTemplateDAApp.startup(SplashTemplateDAApp.java:19)
        at org.jdesktop.application.Application$1.run(Application.java:171)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at java.awt.EventDispatchThread.pumpOneEventForFilters

(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy

(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
Caused by: Exception [TOPLINK-8002] (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs 

(12/06/2007))): oracle.toplink.essentials.exceptions.EJBQLException
Exception Description: General Problem parsing the query [null]. The parser returned the 

following [null].
Internal Exception: java.lang.NullPointerException
        at oracle.toplink.essentials.exceptions.EJBQLException.generalParsingException

(EJBQLException.java:140)
        at oracle.toplink.essentials.internal.parsing.ejbql.EJBQLParser.buildParserFor

(EJBQLParser.java:155)
        at oracle.toplink.essentials.internal.parsing.ejbql.EJBQLParser.buildParseTree

(EJBQLParser.java:126)
        at 

oracle.toplink.essentials.internal.ejb.cmp3.base.EJBQueryImpl.buildEJBQLDatabaseQuery

(EJBQueryImpl.java:215)
        at 

oracle.toplink.essentials.internal.ejb.cmp3.base.EJBQueryImpl.buildEJBQLDatabaseQuery

(EJBQueryImpl.java:189)
        at 

oracle.toplink.essentials.internal.ejb.cmp3.base.EJBQueryImpl.buildEJBQLDatabaseQuery

(EJBQueryImpl.java:153)
        at oracle.toplink.essentials.internal.ejb.cmp3.base.EJBQueryImpl.<init>

(EJBQueryImpl.java:114)
        at oracle.toplink.essentials.internal.ejb.cmp3.base.EJBQueryImpl.<init>

(EJBQueryImpl.java:99)
        at oracle.toplink.essentials.internal.ejb.cmp3.EJBQueryImpl.<init>

(EJBQueryImpl.java:86)
        at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerImpl.createQuery

(EntityManagerImpl.java:204)
        ... 12 more
Caused by: java.lang.NullPointerException
        at java.io.StringReader.<init>(StringReader.java:33)
        at 

oracle.toplink.essentials.internal.parsing.ejbql.antlr273.EJBQLParserBuilder.buildParser

(EJBQLParserBuilder.java:61)
        at oracle.toplink.essentials.internal.parsing.ejbql.EJBQLParser.buildParserFor

(EJBQLParser.java:149)
        ... 20 more
Exception in thread "AWT-EventQueue-0" java.lang.Error: Application class 

splashtemplateda.SplashTemplateDAApp failed to launch
        at org.jdesktop.application.Application$1.run(Application.java:177)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at java.awt.EventDispatchThread.pumpOneEventForFilters

(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy

(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
Caused by: java.lang.IllegalArgumentException: An exception occured while creating a query 

in EntityManager
        at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerImpl.createQuery

(EntityManagerImpl.java:209)
        at splashtemplateda.SplashTemplateDAView.initComponents

(SplashTemplateDAView.java:360)
        at splashtemplateda.SplashTemplateDAView.<init>(SplashTemplateDAView.java:42)
        at splashtemplateda.SplashTemplateDAApp.startup(SplashTemplateDAApp.java:19)
        at org.jdesktop.application.Application$1.run(Application.java:171)
        ... 8 more
Caused by: Exception [TOPLINK-8002] (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs 

(12/06/2007))): oracle.toplink.essentials.exceptions.EJBQLException
Exception Description: General Problem parsing the query [null]. The parser returned the 

following [null].
Internal Exception: java.lang.NullPointerException
        at oracle.toplink.essentials.exceptions.EJBQLException.generalParsingException

(EJBQLException.java:140)
        at oracle.toplink.essentials.internal.parsing.ejbql.EJBQLParser.buildParserFor

(EJBQLParser.java:155)
        at oracle.toplink.essentials.internal.parsing.ejbql.EJBQLParser.buildParseTree

(EJBQLParser.java:126)
        at 

oracle.toplink.essentials.internal.ejb.cmp3.base.EJBQueryImpl.buildEJBQLDatabaseQuery

(EJBQueryImpl.java:215)
        at 

oracle.toplink.essentials.internal.ejb.cmp3.base.EJBQueryImpl.buildEJBQLDatabaseQuery

(EJBQueryImpl.java:189)
        at 

oracle.toplink.essentials.internal.ejb.cmp3.base.EJBQueryImpl.buildEJBQLDatabaseQuery

(EJBQueryImpl.java:153)
        at oracle.toplink.essentials.internal.ejb.cmp3.base.EJBQueryImpl.<init>

(EJBQueryImpl.java:114)
        at oracle.toplink.essentials.internal.ejb.cmp3.base.EJBQueryImpl.<init>

(EJBQueryImpl.java:99)
        at oracle.toplink.essentials.internal.ejb.cmp3.EJBQueryImpl.<init>

(EJBQueryImpl.java:86)
        at oracle.toplink.essentials.internal.ejb.cmp3.EntityManagerImpl.createQuery

(EntityManagerImpl.java:204)
        ... 12 more
Caused by: java.lang.NullPointerException
        at java.io.StringReader.<init>(StringReader.java:33)
        at 

oracle.toplink.essentials.internal.parsing.ejbql.antlr273.EJBQLParserBuilder.buildParser

(EJBQLParserBuilder.java:61)
        at oracle.toplink.essentials.internal.parsing.ejbql.EJBQLParser.buildParserFor

(EJBQLParser.java:149)
        ... 20 more
BUILD SUCCESSFUL (total time: 11 seconds)

I think I need some of this:

try {
                entityManager.getTransaction().commit();
                entityManager.getTransaction().begin();
            } catch (RollbackException rex) {
                rex.printStackTrace();
                entityManager.getTransaction().begin();
                List<splashtemplateda.Content> merged = new ArrayList<splashtemplateda.Content>(list.size());
                for (splashtemplateda.Content c : list) {
                    merged.add(entityManager.merge(c));
                }
                list.clear();
                list.addAll(merged);
            }
            return null;
        }

If I mastertable.clear()
is it possible that
where merge could hold the getResultSet()

Scratch this one. As usual I made it much more complicated than it had to be. The solution was much easier than I made it

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