UI Freeze in SWT - swt

Question

I am new to SWT. I am trying to create a small application. Basically it has two screens. In the first screen I have to take user credentials. It has to be validated. If its successful I have to query a table and build a tree structure. Both validation and building the tree freezes my UI. I searched stackoverflow and google. I got the below options.
Display.getDefault().asyncExec() and starting long running process as separate thread from UI thread.
But still my UI freezes.
When the user clicks on Logon button. I created a thread. As a first step I tried to show a indefinite progress bar using asyncExec. Since I have to access the Uname and Password I have to trigger another asyncexec and perform the login. If its successful populated the tree.
I triggered another asyncExec to close the progress bar.
My UI freezes from Logon click till Tree population completion. Where am I going wrong.
new Thread(new Runnable()
{
private int progress = 0;
private static final int INCREMENT = 10;
#Override
public void run()
{
while (!progressBar.isDisposed())
{
Display.getDefault().asyncExec(new Runnable()
{
#Override
public void run()
{
if (!progressBar.isDisposed())
progressBar.setVisible(true);
}
});
Display.getDefault().asyncExec(new Runnable()
{
#Override
public void run()
{
String sAuth = null;
switch(tAuth.getText()){
case "Enterprise": sAuth = "secEnterprise"; break;
case "LDAP": sAuth = "secLDAP"; break;
case "Windows AD": sAuth = "secWinAD"; break;
case "SAP": sAuth = "secSAPR3"; break;
}
try {
log.info("Attempting to create enterprise session");
CoreLogic.logonEnterprise(tUSR.getText().trim(),tPWD.getText().trim(),sAuth,tCMS.getText());
if(CommonVariables.entsession){
log.info("Enterprise session created.");
CoreLogic.getUniverse();
log.info("Populating universe tree");
String[] temp;
for (Entry<Integer, UnvObj> entry : CommonVariables.unvlst.entrySet()) {
UnvObj t = entry.getValue();
temp = t.getPath().split("/");
if (temp[0].equals("Universes")){
int max = temp.length;
int i =0 ;
boolean flag = false;
TreeItem trItem = null;
do{
if(i == 0) {
if(tree.getItemCount() == 0){
flag = false;
}
else
{
for(int k = 0; k < tree.getItemCount(); k++){
if(temp[i].equals(tree.getItem(k).getText())){
i++;
trItem = tree.getItem(k);
flag =true;
break;
}
else
{
flag = false;
}
}
}
}
else{
if(trItem.getItemCount() == 0){
flag = false;
}
else
{
for(int k = 0; k < trItem.getItemCount(); k++){
if(temp[i].equals(trItem.getItem(k).getText())){
i++;
trItem = trItem.getItem(k);
flag =true;
break;
}
else
{
flag = false;
}
}
}
}
}while (flag == true && i < max);
TreeItem Item = null;
if (i == 0){
for (int k = 0; k < max; k++){
if(k == 0) {
Item = new TreeItem(tree,SWT.NONE);
Item.setText(temp[k]);
Item.setData("Type","Folder");
Image image = new Image(display,ResourceLoader.load("/images/Fld.png"));
Item.setImage(image);
}else
{
Item = new TreeItem(Item,SWT.NONE);
Item.setText(temp[k]);
Item.setData("Type","Folder");
Image image = new Image(display,ResourceLoader.load("/images/Fld.png"));
Item.setImage(image);
}
}
} else if( i < max){
for (int k = i; k < max; k++){
trItem = new TreeItem(trItem,SWT.NONE);
trItem.setText(temp[k]);
trItem.setData("Type","Folder");
Image image = new Image(display,ResourceLoader.load("/images/Fld.png"));
trItem.setImage(image);
}
}
if (i == 0){
Item = new TreeItem(Item,SWT.NONE);
Item.setText(t.getName());
Item.setData("Type",t.getKind());
Item.setData("Mapkey",entry.getKey());
if(t.getKind().equals("Universe")){
Image image = new Image(display,ResourceLoader.load("/images/Unv.ico"));
Item.setImage(image);
}
else{
Image image = new Image(display,ResourceLoader.load("/images/Unx.ico"));
Item.setImage(image);
}
} else
{
trItem = new TreeItem(trItem,SWT.NONE);
trItem.setText(t.getName());
trItem.setData("Type",t.getKind());
trItem.setData("Mapkey",entry.getKey());
if(t.getKind().equals("Universe")){
Image image = new Image(display,ResourceLoader.load("/images/Unv.ico"));
trItem.setImage(image);
}
else{
Image image = new Image(display,ResourceLoader.load("/images/Unx.ico"));
trItem.setImage(image);
}
}
}
}
log.info("Universe Tree Populated.");
sl.topControl =Universe;
Main.layout();
}else
{
log.info("Unable to create enterprise session");
MessageBox messageBox = new MessageBox(shell, SWT.ICON_WARNING | SWT.OK);
messageBox.setText("Report Extractor");
messageBox.setMessage("Unable to create the enterprise session with the provided credentials. Please verify it.");
messageBox.open();
}
}
catch(Exception exp)
{
log.error("Fail to create enterprise session",exp);
}
}
});
Display.getDefault().asyncExec(new Runnable()
{
#Override
public void run()
{
if (!progressBar.isDisposed())
progressBar.setVisible(false);
}
});
}
}
}).start();