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  • Amount of data stored in session

    - by srinannapa
    What technique should we use to make the httpsession object not loaded heavily with data. Example : Request 1 ---- httpSession loaded with an arraylist of 50,000 different objects. session.setAttribute("data",arraylist); Request 2 ---- httpSession loaded with an arraylist of 40,000 different objects. session.setAttribute("data",arraylist); Assume the server is loaded heavily with multiple sessions and huge data in them. Let us say from my above example request1..1000 at a time. Which means 1000 session objects with huge data. What is the alternate way to solve instead storing them in session like this?

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  • How to shuffle pairs

    - by Jessy
    How to shuffle the elements in the pairs? The program below, generate all possible pairs and later shuffle the pairs. e.g. possible pairs before shuffle is ab,ac,ae,af..etc shuffled to ac,ae,af,ab...etc How to make it not only shuffled in pairs but within the elements in the pair itself? e.g. instead of ab, ac, how can I make ba, ac ? String[] pictureFile = {"a.jpg","b.jpg","c.jpg","d.jpg","e.jpg","f.jpg","g.jpg"}; List <String> pic1= Arrays.asList(pictureFile); ... ListGenerator pic2= new ListGenerator(pic1); ArrayList<ArrayList<Integer>> pic2= new ArrayList<ArrayList<Integer>>(); public class ListGenerator { public ListGenerator(List<String> pic1) { int size = pic1.size(); // create a list of all possible combinations for(int i = 0 ; i < size ; i++) { for(int j = (i+1) ; j < size ; j++) { ArrayList<Integer> temp = new ArrayList<Integer>(); temp.add(i); temp.add(j); pic2.add(temp); } } Collections.shuffle(pic2); } //This method return the shuffled list public ArrayList<ArrayList<Integer>> getList() { return pic2; } }

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  • Netbeans can't find running Tomcat

    - by Yurish
    Hi! I'm running Tomcat inside of Netbeans. I added Tomcat server(not bundled with Netbeans) to Servers in Netbeans. But, when i'm trying to run Tomcat, it starts(i can visit Tomcat home page), but Netbeans can't find it running. Where is the problem? No stacktrace in Tomcat. When i'm deploying my project`s war in this Tomcat manually, everything works, but i need to deploy it automatically from Netbeans. Configuration: Netbeans 6.8 + Tomcat 6.0.26 + JSF and Hibernate project.

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  • What situations does a Monostate pattern model?

    - by devoured elysium
    I know what both a Singleton or a Monostate are and how to implement them. Although I can see many uses for a Singleton, I can't imagine a situation where I would want to let the user create as many instances of my class although in reality only one really exists behind the scenes. Can anybody help me here? I know that for several reasons one should stay away from both patterns, but in theory, what kind of problems does the Monostate model? Thanks

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  • null != null - any ideas on how to re-arrange the code or prevent this?

    - by Alex
    Currently debugging, and found an if-statement which for no (I thought...) reason gave me an NPE, obviously for a reason. Which seemed to be that the statement turned out to be if(false && (null != null || null != Color)). if(destination != null && (destination.getPiece() != null || destination.getPiece().getColour() != pieceColour)) - the if-statement Both destination can be null and piece can be. The getColour() method returns an attribute of type Color from piece, which must be null if the piece is null. The piece at destination has a different pieceColour attribute then the one in the if-statement. Specifically, how do I re-arrange (destination.getPiece() != null) ?

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  • RESTEasy - access to web folder for geting image

    - by Trick
    I would like to allow users to access images saved in web folder. For example - I have an image in web root folder "blank.png". But the link http://localhost:8080/myapp/blank.png returns 404 (not found). Adding type to resteasy.media.type.mappings does not work. I am a bit of a newbie in RESTEasy...

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  • Adding a JLabel to JLayeredPane from event listener not dragging.

    - by Cody
    Ok, So for some reason When I add components to a JLayeredPane in its constructor: JLabel label = new JLabel(); label.setSize(100,100); label.setText("This works"); add(label); It works perfectly fine, but If a add it later in the JLayeredPane's parent EDT it doesnt let me move the objects around but they let me see the objects. Adding from EDT: JLabel label = new JLabel(); label.setToolTipText(url.getHost()); label.setIcon(icon); label.setBorder(new LineBorder(null)); label.setSize(icon.getIconWidth(), icon.getIconHeight()); dressFrame.layeredPane.add(label, JLayeredPane.DRAG_LAYER); Dragging method: Component c = findComponentAt(e.getX(), e.getY()); if (c instanceof JLayeredPane) { pieceSelected = false; return; } Point parentLocation = c.getLocation(); xAdjustment = parentLocation.x - e.getX(); yAdjustment = parentLocation.y - e.getY(); movingPiece = c; movingPiece.setLocation(e.getX() + xAdjustment, e.getY() + yAdjustment); pieceSelected = true;

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  • Jasper Report doc export margin problem

    - by Nods
    Hi there, Im using Jasper Reports to generate a word (docx) document but I have a problem when I want to try to print the doc. The exporter messes up the margins of the page. Does anyone know how to prevent that from happening. I know how to set the margin in iReport, but it just makes the data generate further from the page borders, but the margins in word which can be adjusted at the top of the page is laying right at the edge. Has anyone had this problem? Thanks for the help, in advance, Nods

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  • JavaDB connection error (network protocol)

    - by oO
    I'm trying to connect to derby using this: dbProperties.put("create", "true"); dbProperties.put("dataEncryption", "true"); dbProperties.put("encryptionAlgorithm", "DES/CBC/NoPadding"); dbProperties.put("encryptionKey", "1234567890123456"); dbProperties.put("securityMechanism", ClientDataSource.STRONG_PASSWORD_SUBSTITUTE_SECURITY); // protocol is dbProperties.getProperty("derby.url", "jdbc:derby://localhost:1527/"); dbConnection = DriverManager.getConnection(protocol + dbName, dbProperties); but i get an error: A connection could not be established because the database name (...) is larger than the maximum length allowed by the network protocol. Is there a way to increase this length?

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  • Interface Design Problem: Storing Result of Transactions

    - by jboyd
    Requirements: multiple sources of input (social media content) into a system multiple destinations of output (social media api's) sources and destinations WILL be added some pseudo: IContentProvider contentProvider = context.getBean("contentProvider"); List<Content> toPost = contentProvider.getContent(); for (Content c : toPost) { SocialMediaPresence smPresence = socialMediaService.getSMPresenceBySomeId(c.getDestId()); smPresence.hasTwitter(); smPresence.hasFacebook(); //just to show what this is smPresence.postContent(c); //post content could fail for some SM platforms, but shoulnd't be lost forever } So now I run out of steam, I need to know what content has been successfully posted, and if it hasn't gone too all platforms, or if another platform were added in the future that content needs to go out for it as well (therefore my content provider will need to not only know if content has gone out, but for what platforms). I'm not looking for code, although sample/pseudo is fine... I'm looking for an approach to this problem that I can implement

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  • How to add the coding for displaying the address when a particular set of latitude and longitude is

    - by KKC
    import com.google.android.maps.GeoPoint; import com.google.android.maps.MapActivity; import com.google.android.maps.MapController; import com.google.android.maps.MapView; import android.os.Bundle; import android.view.KeyEvent; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.AdapterView.OnItemSelectedListener; public class PopularAttractions extends MapActivity { private String[ ][ ] locations = { {"Singapore Zoological Garden","1.40502,103.793449"}, {"Singapore Night Safari","1.4037,103.789467"}, {"Jurong BirdPark","1.32005,103.707153"}, {"Jurong Reptile Park","1.321177,103.708486"}, {"Singapore Botanic Garden","1.31471,103.815689"}, {"Sungei Buloh Wetland Reserver","1.445144,103.729595"}, {"Escape Theme Park","1.38104,103.936928"}, {"Snow City","1.32823,103.74263"}, {"Super Ice World","1.300422,103.875348"}, {"Chinatown Heritage Center","1.2836,103.84425"}, {"Singapore Science Center","1.3249,103.740578"}, {"Red Dot Design Museum","1.277762,103.846225"}, {"G-Max Reverse Bungy","1.2906,103.845322"}, {"NEWater Visitor Center","1.33105,103.955311"} }; private Spinner spinnerView; private MapView mapView; private MapController mc; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); spinnerView = (Spinner) this.findViewById(R.id.spinner1); mapView = (MapView) findViewById(R.id.mapview1); mc = mapView.getController(); ArrayAdapter<CharSequence> adapter = new ArrayAdapter<CharSequence>(this, android.R.layout.simple_spinner_dropdown_item); //--add the various locations--- for(int i = 0; i < locations.length; i++) adapter.add(locations[i][0]); adapter.setDropDownViewResource( android.R.layout.simple_spinner_dropdown_item); spinnerView.setAdapter(adapter); spinnerView.setOnItemSelectedListener(selectListener); gotoSelected(); } //---when user selects an item--- private OnItemSelectedListener selectListener = new OnItemSelectedListener() { //---these are two methods you need to implement--- public void onItemSelected( AdapterView<?>parent, View v, int position, long id) { gotoSelected(); } public void onNothingSelected(AdapterView<?> arg0) {} }; //---when an item has been selected--- public void gotoSelected() { int index = spinnerView.getSelectedItemPosition(); String[] coordinates = locations[index][1].split(","); double lat = Double.parseDouble(coordinates[0]); double lng = Double.parseDouble(coordinates[1]); GeoPoint location = new GeoPoint ( (int)(lat * 1E6), (int)(lng * 1E6)); mc.animateTo(location); mc.setZoom(16); if (mapView.isSatellite()) mapView.setSatellite(false); else mapView.setStreetView(true); mapView.invalidate(); } public boolean onKeyDown(int keyCode, KeyEvent event) { MapController mc = mapView.getController(); switch (keyCode) { case KeyEvent.KEYCODE_3: mc.zoomIn(); break; case KeyEvent.KEYCODE_1: mc.zoomOut(); break; } return super.onKeyDown(keyCode, event); } @Override protected boolean isRouteDisplayed(){ //TODO Auto-generated method sub return false; } }

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  • Algorithm to aggregate values from child tree nodes

    - by user222164
    I have objects in a tree structure, I would like to aggregate status information from children nodes and update parent node with aggregated status. Lets say node A has children B1, B2, and B1 has C1, C2, C3 as children. Each of the nodes have a status attribute. Now if C1, C2, C3 are all complete then I would like to mark B1 as completed. And if C4, C5,C6,C7 are complete make B2 as complete. When B1 and B2 are both complete mark A as complete. I can go through these nodes in brute force method and make updates, could someone suggest an efficient algorithm to do it. A { B1 { C1, C2, C3}, B2 { C4, C5, C6, C7} }

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  • Overwrite HTTP method with JAX-RS

    - by deamon
    Today's browsers (or HTML < 5) only support HTTP GET and POST, but to communicate RESTful one need PUT and DELETE too. If the workaround should not be to use Ajax, something like a hidden form field is required to overwrite the actual HTTP method. Rails uses the following trick: <input name="_method" type="hidden" value="put" /> Is there a possibility to do something similar with JAX-RS?

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  • Hibernate Validator - Using properties in the constraints xml

    - by Avi Y
    Hi, I have just started using hibernate validator. I am creating the constraints in an XML file(not annotations). The only problem I am having is that I would like to use properties inside the constraints. For example: <bean class="MyBean" > <constraint annotation="javax.validation.constraints.Min"> <element name="value">{myProperty}</element> </constraint> </bean> and I would like to define these properties in a separate file. Do you think that's possible? Any help would be appreciated.

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  • Why do my Sax Parser produce no results after using InputStream Read?

    - by Andy Barlow
    Hello, I have this piece of code which I'm hoping will be able to tell me how much data I have downloaded (and soon put it in a progress bar), and then parse the results through my Sax Parser. If I comment out basically everything above the //xr.parse(new InputSource(request.getInputStream())); line and swap the xr.parse's over, it works fine. But at the moment, my Sax parser tells me I have nothing. Is it something to do with is.read (buffer) section? Also, just as a note, request is a HttpURLConnection with various signatures. /*Input stream to read from our connection*/ InputStream is = request.getInputStream(); /*we make a 2 Kb buffer to accelerate the download, instead of reading the file a byte at once*/ byte [ ] buffer = new byte [ 2048 ] ; /*How many bytes do we have already downloaded*/ int totBytes,bytes,sumBytes = 0; totBytes = request.getContentLength () ; while ( true ) { /*How many bytes we got*/ bytes = is.read (buffer); /*If no more byte, we're done with the download*/ if ( bytes <= 0 ) break; sumBytes+= bytes; Log.v("XML", sumBytes + " of " + totBytes + " " + ( ( float ) sumBytes/ ( float ) totBytes ) *100 + "% done" ); } /* Parse the xml-data from our URL. */ // OLD, and works if comment all the above //xr.parse(new InputSource(request.getInputStream())); xr.parse(new InputSource(is)) /* Parsing has finished. */; Can anyone help me at all?? Kind regards, Andy

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  • Slow retrieval of data in SQLITE takes a long using ContentProvider

    - by Arlyn
    I have an application in Android (running 4.0.3) that stores a lot of data in Table A. Table A resides in SQLite Database. I am using a ContentProvider as an abstraction layer above the database. Lots of data here means almost 80,000 records per month. Table A is structured like this: String SQL_CREATE_TABLE = "CREATE TABLE IF NOT EXISTS " + TABLE_A + " ( " + COLUMN_ID + " INTEGER PRIMARY KEY NOT NULL" + "," + COLUMN_GROUPNO + " INTEGER NOT NULL DEFAULT(0)" + "," + COLUMN_TIMESTAMP + " DATETIME UNIQUE NOT NULL" + "," + COLUMN_TAG + " TEXT" + "," + COLUMN_VALUE + " REAL NOT NULL" + "," + COLUMN_DEVICEID + " TEXT NOT NULL" + "," + COLUMN_NEW + " NUMERIC NOT NULL DEFAULT(1)" + " )"; Here is the index statement: String SQL_CREATE_INDEX_TIMESTAMP = "CREATE INDEX IF NOT EXISTS " + TABLE_A + "_" + COLUMN_TIMESTAMP + " ON " + TABLE_A + " (" + COLUMN_TIMESTAMP + ") "; I have defined the columns as well as the table name as String Constants. I am already experiencing significant slow down when retrieving this data from Table A. The problem is that when I retrieve data from this table, I first put it in an ArrayList and then I display it. Obviously, this is possibly the wrong way of doing things. I am trying to find a better way to approach this problem using a ContentProvider. But this is not the problem that bothers me. The problem is for some reason, it takes a lot longer to retrieve data from other tables which have only upto 12 records maximum. I see this delay increase as the number of records in Table A increase. This does not make any sense. I can understand the delay if I retrieve data from Table A, but why the delay in retrieving data from other tables. To clarify, I do not experience this delay if Table A is empty or has less than 3000 records. What could be the problem?

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  • Spring @Autowired and WebApplicationContext in Tomcat

    - by EugeneP
    @Autowired works only once. What to do to make it wire the bean every time the Servlet is recreated? My web-app (Tomcat6 container) consists of 2 Servlets. Every servlet has private fields. Their setters are marked with @Autowired In the init method I use WebApplicationContextUtils ... autowireBean(this); It autowires the properties marked with @Autowired once - during the initialization of the Servlet. Any other session will see these fields values, they will not be rewired after the previous session is destroyed. What to do to make them rewire them each time a Servlet constructor is called? a) Put the autowiring into the constructor? Or better 2) get a web app context and extract a bean from there?

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  • Set HTML dropdown selected option using JSTL

    - by sarah
    In the same context i have another query ${productSubCategoryList} and the corresponding setting in request is like for(int i=0;i } here i have multiple select drop down ,even though i get the return value from for as two ,in the UI only one data is getting higlighted not the second one,What is wrong in the code ?

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