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  • Domain model integration using JSON capable DTOs

    - by g-makulik
    I'm a bit confused about architectural choices for the java/web-applications world. The background is I have a system with certain hardware components (that introduce system immanent active behavior) and a configuration database for system meta and HW-components configuration data (these are even usually self contained, since the HW-components persist configuration data anyway). For realization of the configuration/status data exchange protocol with the HW-components we have chosen the Google Protobuf format, which works well for the directly wired communication with these components. Now we want to develop an abstract model (domain model) for those HW-components and I have the feeling that a plain Java class model would fit best for this (c++ implementation seems to have too much implementation/integration overhead with viable language-bridge interfaces). Google Protobuf message definitions could still serve well to describe DTO objects used to interact with a domain model API. But integrating Google Protobuf messages client side for e.g. data binding in the current view doesn't seem to be a good choice. I'm thinking about some extra serialization features, e.g. for JSON based data exchange with the views/controllers. Most lightweight solutions seem to involve a python based presentation layer using JSON based data transfer (I'm at least not sure to be fully informed about this). Is there some lightweight (applicable for a limited ARM Linux platform) framework available, supporting such architecture to realize a web-application?

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  • How to manage a lot of Action Listeners for multiple buttons

    - by Wumbo4Dayz
    I have this Tic Tac Toe game and I thought of this really cool way to draw out the grid of 9 little boxes. I was thinking of putting buttons in each of those boxes. How should I give each button (9 buttons in total) an ActionListener that draws either an X or O? Should they each have their own, or should I do some sort of code that detects turns in this? Could I even do a JButton Array and do some for loops to put 9 buttons. So many possibilities, but which one is the most proper? Code so far: import javax.swing.*; import java.awt.event.*; import java.awt.*; public class Board extends JPanel implements ActionListener{ public Board(){ Timer timer = new Timer(25,this); timer.start(); } @Override protected void paintComponent(Graphics g){ for(int y = 0; y < 3; y++){ for(int x = 0; x < 3; x++){ g.drawRect(x*64, y*64, 64, 64); } } } public void actionPerformed(ActionEvent e){ repaint(); } }

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  • Why is heap size fixed on JVMs?

    - by themel
    Can anyone explain to me why JVMs (I didn't check too many, but I've never seen one that didn't do it that way) need to run on a fixed heap size? I know it's easier to implement on a simple contiguous heap, but the Sun JVM is now over a decade old, so I'd expect them to have had time to improve this. Needing to define the maximum memory size of your program at startup time seems such a 1960s thing to do, and then there are the bad interactions with OS virtual memory management (GC retrieving swapped out data, inability to determine how much memory the Java process is really using from the OS side, huge amounts of VM space wasted (I know, you don't care on your fancy 48bit machines...)). I also guess that the various sad attempts to build small operating systems inside the JVM (EE application servers, OSGi) are at least partially to blame on this circumstance, because running multiple Java processes on a system invariably leads to wasted resources because you have to give each of them the memory it might have to use at peak. Surprisingly, Google didn't yield the storms of outrage over this that I would expect, but they may just have been buried under the millions of people finding out about fixed heap size and just accepting it for a fact.

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  • Store scores for players and produce a high score list

    - by zrvan
    This question is derived from an interview question that I got for a job I was declined. I have asked for code review for my solution at the dedicated Stack Exchange site. But I hope this question is sufficiently rephrased and asked with a different motivation not to be a duplicate of the other question. Consider the following scenario: You should store player scores in the server back end of a game. The server is written in Java. Every score should be registered, that is, one player may have any number of scores for any number of levels. A high score list should be produced with the fifteen top scores for a given level, but only one score per user (to the effect that even if player X has the two highest scores for level Y, only the first position is counted and player Z has the second place). No information should be persisted and only Java 1.7+ standard libraries should be used. No third party libraries or frameworks are acceptable. With the number of players as the primary factor, what would be the best data structure in terms of scalability and concurrency? How would you access the structure to register a single score given a level and a player id? How would you access the structure to compile the high score list?

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  • Hide or Show singleton?

    - by Sinker
    Singleton is a common pattern implemented in both native libraries of .NET and Java. You will see it as such: C#: MyClass.Instance Java: MyClass.getInstance() The question is: when writing APIs, is it better to expose the singleton through a property or getter, or should I hide it as much as possible? Here are the alternatives for illustrative purposes: Exposed(C#): private static MyClass instance; public static MyClass Instance { get { if (instance == null) instance = new MyClass(); return instance; } } public void PerformOperation() { ... } Hidden (C#): private static MyClass instance; public static void PerformOperation() { if (instance == null) { instance = new MyClass(); } ... } EDIT: There seems to be a number of detractors of the Singleton design. Great! Please tell me why and what is the better alternative. Here is my scenario: My whole application utilises one logger (log4net/log4j). Whenever, the program has something to log, it utilises the Logger class (e.g. Logger.Instance.Warn(...) or Logger.Instance.Error(...) etc. Should I use Logger.Warn(...) or Logger.Warn(...) instead? If you have an alternative to singletons that addresses my concern, then please write an answer for it. Thank you :)

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  • Series On Embedded Development (Part 1)

    - by user12612705
    This is the first in a series of entries on developing applications for the embedded environment. Most of this information is relevant to any type of embedded development (and even for desktop and server too), not just Java. This information is based on a talk Hinkmond Wong and I gave at JavaOne 2012 entitled Reducing Dynamic Memory in Java Embedded Applications. One thing to remember when developing embeddded applications is that memory matters. Yes, memory matters in desktop and server environments as well, but there's just plain less of it in embedded devices. So I'm going to be talking about saving this precious resource as well as another precious resource, CPU cycles...and a bit about power too. CPU matters too, and again, in embedded devices, there's just plain less of it. What you'll find, no surprise, is that there's a trade-off between performance and memory. To get better performance, you need to use more memory, and to save more memory, you need to need to use more CPU cycles. I'll be discussing three Memory Reduction Categories: - Optionality, both build-time and runtime. Optionality is about providing options so you can get rid of the stuff you don't need and include the stuff you do need. - Tunability, which is about providing options so you can tune your application by trading performance for size, and vice-versa. - Efficiency, which is about balancing size savings with performance.

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  • Looking for some advice on the next steps to take [closed]

    - by mopsyd
    I am looking for some advice on the next step to take in development of my programming skills. I was directed here when asking this question on Stack Overflow. What I know already Have a solid grasp of xhtml, xml, php, javascript, MySQL, actionscript. Have a working knowledge of vb, and have a slight grasp of java from tinkering with a minecraft server. Some brief exposure to the Unreal Engine in college. Some skills with sql server, ms sql, office integration, etc. Also some knowledge of Asterix and PBX/VOIP. Been coding off and on since the age of 8 but I have no computer science education aside from what I have taught myself or learned from work/freelance. I work in OSX mostly, but can use/troubleshoot windows and ubuntu fluently also. Decent with both UNIX and DOS CLI. What I'm considering I'm looking to learn a scripting language to build web apps, help streamline my home server that I am building and run shell scripts. Being able to help code games later is a big plus. My Question Between java, ruby, perl, and python, which would be the best investment of my time considering what I already know and what direction I would like to take my skillset? What are good resources for your suggested direction? Thanks in advance.

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  • How can I be able to create a folder node on companyhome in Alfresco? [migrated]

    - by bluestella
    I am having a hard time looking for an answer to my question. I am trying to create a folder/space in Alfresco. But I don't have any idea doing it? Can someone help me with this? I'm using Java webscript. All I am at is this: package org.alfresco.module.demoscripts; import java.io.IOException; import org.alfresco.web.scripts.AbstractWebScript; import org.alfresco.web.scripts.WebScriptException; import org.alfresco.web.scripts.WebScriptRequest; import org.alfresco.web.scripts.WebScriptResponse; import org.json.JSONException; import org.json.JSONObject; public class SimpleWebScript extends AbstractWebScript { public void execute(WebScriptRequest req, WebScriptResponse res) throws IOException { try { // build a json object JSONObject obj = new JSONObject(); // put some data on it obj.put("field1", "data1"); // build a JSON string and send it back String jsonString = obj.toString(); res.getWriter().write(jsonString); } catch(JSONException e) { throw new WebScriptException("Unable to serialize JSON"); } } }

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  • Social Network ( Help) [on hold]

    - by brunocascio
    I am in a great "problem" so to speak , and I need opinions to decide. The problem is to create a social network without knowing the number of users who use it (but if thinking if they were sufficient ) . The question is which language and framework to use .... I do not mind having to learn new technologies and / or languages ??. I am among PHP ( Laravel - Symfony - other? ) Ruby ( Ruby on Rails 4? ) Javascript ( Ember , express, locomotive , other? ) Python ( Django ) Java ( Grails , Play, other?) I have experience in both PHP and frameworks. In Symfony developed part of it, but I got tired having to do a thousand configurations for all . I know very little about Ruby , but I saw very easy . I do not know are saying the performance. Javascript costs me to get used to their paradigm , and do not know if at all sure to cover everything with Javascript. Django and python ( very poor knowledge ) Java , experience in data structure and android , but not web . Regarding the / s databases: In my head I have to MongoDB and costs change of opinion by another database with respect to documentation and EASE performance . But .......... frameworks have no support at all clear . I also thought of mixing technologies for using a tecnlogía backend and the frontend other. As I read in the new social network Origo . They use Symfony for REST and javascript for the frontend . ( Backbone , Underscore and RequireJS ) What do you recommend me ?

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  • Play! Framework 1.2.4 --- C3P0 settings to avoid Communications link failure do to idle time

    - by HelpMeStackOverflowMyOnlyHope
    I'm trying to customize my C3P0 settings to avoid the error shown at the bottom of this post. It was suggested at this url --- http://make-it-open.blogspot.com/2008/12/sql-error-0-sqlstate-08s01.html --- to adjust the settings as follows: In hibernate.cfg.xml, write <property name="c3p0.min_size">5</property> <property name="c3p0.max_size">20</property> <property name="c3p0.timeout">1800</property> <property name="c3p0.max_statements">50</property> Then create "c3p0.properties" in your root classpath folder and write c3p0.testConnectionOnCheckout=true c3p0.acquireRetryDelay=1000 c3p0.acquireRetryAttempts=1 I've tried to make those adjustments following the direction of the Play! Framework documentation, where they say use "db.pool..." as follows: db.pool.timeout=1800 db.pool.maxSize=15 db.pool.minSize=5 db.pool.initialSize=5 db.pool.acquireRetryAttempts=1 db.pool.preferredTestQuery=SELECT 1 db.pool.testConnectionOnCheckout=true db.pool.acquireRetryDelay=1000 db.pool.maxStatements=50 Are those settings not going to work? Should I be trying to set them in a different way? With those settings I still get the error shown below, that is due to to long of a idle time. Complete Stack Trace of Error: 23:00:44,932 WARN ~ SQL Error: 0, SQLState: 08S01 2012-04-13T23:00:44+00:00 app[web.1]: 23:00:44,932 ERROR ~ Communications link failure 2012-04-13T23:00:44+00:00 app[web.1]: 2012-04-13T23:00:44+00:00 app[web.1]: The last packet successfully received from the server was 274,847 milliseconds ago. The last packet sent successfully to the server was 7 milliseconds ago. 2012-04-13T23:00:44+00:00 app[web.1]: 23:00:44,934 ERROR ~ Why the driver complains here? 2012-04-13T23:00:44+00:00 app[web.1]: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.Connection was implicitly closed by the driver. 2012-04-13T23:00:44+00:00 app[web.1]: at com.mysql.jdbc.Util.handleNewInstance(Util.java:407) 2012-04-13T23:00:44+00:00 app[web.1]: at com.mysql.jdbc.Util.getInstance(Util.java:382) 2012-04-13T23:00:44+00:00 app[web.1]: at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1013) 2012-04-13T23:00:44+00:00 app[web.1]: at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987) 2012-04-13T23:00:44+00:00 app[web.1]: at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982) 2012-04-13T23:00:44+00:00 app[web.1]: at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:927) 2012-04-13T23:00:44+00:00 app[web.1]: at com.mysql.jdbc.ConnectionImpl.throwConnectionClosedException(ConnectionImpl.java:1213) 2012-04-13T23:00:44+00:00 app[web.1]: at com.mysql.jdbc.ConnectionImpl.getMutex(ConnectionImpl.java:3101) 2012-04-13T23:00:44+00:00 app[web.1]: at com.mysql.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:4975) 2012-04-13T23:00:44+00:00 app[web.1]: at org.hibernate.jdbc.BorrowedConnectionProxy.invoke(BorrowedConnectionProxy.java:74) 2012-04-13T23:00:44+00:00 app[web.1]: at $Proxy49.setAutoCommit(Unknown Source) 2012-04-13T23:00:44+00:00 app[web.1]: at play.db.jpa.JPAPlugin.closeTx(JPAPlugin.java:368) 2012-04-13T23:00:44+00:00 app[web.1]: at play.db.jpa.JPAPlugin.onInvocationException(JPAPlugin.java:328) 2012-04-13T23:00:44+00:00 app[web.1]: at play.plugins.PluginCollection.onInvocationException(PluginCollection.java:447) 2012-04-13T23:00:44+00:00 app[web.1]: at play.Invoker$Invocation.onException(Invoker.java:240) 2012-04-13T23:00:44+00:00 app[web.1]: at play.jobs.Job.onException(Job.java:124) 2012-04-13T23:00:44+00:00 app[web.1]: at play.jobs.Job.call(Job.java:163) 2012-04-13T23:00:44+00:00 app[web.1]: at play.jobs.Job$1.call(Job.java:66) 2012-04-13T23:00:44+00:00 app[web.1]: at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) 2012-04-13T23:00:44+00:00 app[web.1]: at java.util.concurrent.FutureTask.run(FutureTask.java:166) 2012-04-13T23:00:44+00:00 app[web.1]: at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:165) 2012-04-13T23:00:44+00:00 app[web.1]: at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:266) 2012-04-13T23:00:44+00:00 app[web.1]: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) 2012-04-13T23:00:44+00:00 app[web.1]: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) 2012-04-13T23:00:44+00:00 app[web.1]: at java.lang.Thread.run(Thread.java:636) 2012-04-13T23:00:44+00:00 app[web.1]: Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

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  • sherlock actionbar menu

    - by user1647443
    I am trying to setup a menu programatically and my method gets com.actionbarsherlock.view.Menu menu as a parameter. As I want to change the styling of the menu item I am trying to setup a SpannableString spannable and pass it to add. menu.add(0, MENU_ABOUT, 0, spannable); This is causing a crash only in ICS when I cick that menu item. Any ideas if I am missing something. Thanks Here is the code I am trying and it crashes when I run the app and select "About Application". FYI, I am using SpannableString because I want to add some styling and color to the menu item. The crash does NOT happen if I use a regular string, but then I cant do styling public boolean onCreateOptionsMenu(com.actionbarsherlock.view.Menu menu) { SpannableString spannable = new SpannableString("About Application"); menu.add(0, MENU_ABOUT, 0, spannable); return true; } Here is the stack trace: 09-05 02:25:32.849: E/AndroidRuntime(684): FATAL EXCEPTION: main 09-05 02:25:32.849: E/AndroidRuntime(684): java.lang.IllegalArgumentException: Invalid payload item type 09-05 02:25:32.849: E/AndroidRuntime(684): at android.util.EventLog.writeEvent(Native Method) 09-05 02:25:32.849: E/AndroidRuntime(684): at android.app.Activity.onMenuItemSelected(Activity.java:2501) 09-05 02:25:32.849: E/AndroidRuntime(684): at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:351) 09-05 02:25:32.849: E/AndroidRuntime(684): at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:950) 09-05 02:25:32.849: E/AndroidRuntime(684): at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:735) 09-05 02:25:32.849: E/AndroidRuntime(684): at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:149) 09-05 02:25:32.849: E/AndroidRuntime(684): at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:874) 09-05 02:25:32.849: E/AndroidRuntime(684): at com.android.internal.view.menu.ListMenuPresenter.onItemClick(ListMenuPresenter.java:163) 09-05 02:25:32.849: E/AndroidRuntime(684): at android.widget.AdapterView.performItemClick(AdapterView.java:292) 09-05 02:25:32.849: E/AndroidRuntime(684): at android.widget.AbsListView.performItemClick(AbsListView.java:1058) 09-05 02:25:32.849: E/AndroidRuntime(684): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2514) 09-05 02:25:32.849: E/AndroidRuntime(684): at android.widget.AbsListView.onTouchEvent(AbsListView.java:3180) 09-05 02:25:32.849: E/AndroidRuntime(684): at android.view.View.dispatchTouchEvent(View.java:5541) 09-05 02:25:32.849: E/AndroidRuntime(684): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1951) 09-05 02:25:32.849: E/AndroidRuntime(684): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1712) 09-05 02:25:32.849: E/AndroidRuntime(684): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1957) 09-05 02:25:32.849: E/AndroidRuntime(684): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1726) 09-05 02:25:32.849: E/AndroidRuntime(684): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1860) 09-05 02:25:32.849: E/AndroidRuntime(684): at android.view.View.dispatchPointerEvent(View.java:5721) 09-05 02:25:32.849: E/AndroidRuntime(684): at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:2890) 09-05 02:25:32.849: E/AndroidRuntime(684): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2466) 09-05 02:25:32.849: E/AndroidRuntime(684): at android.view.ViewRootImpl.processInputEvents(ViewRootImpl.java:845) 09-05 02:25:32.849: E/AndroidRuntime(684): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2475) 09-05 02:25:32.849: E/AndroidRuntime(684): at android.os.Handler.dispatchMessage(Handler.java:99) 09-05 02:25:32.849: E/AndroidRuntime(684): at android.os.Looper.loop(Looper.java:137) 09-05 02:25:32.849: E/AndroidRuntime(684): at android.app.ActivityThread.main(ActivityThread.java:4424) 09-05 02:25:32.849: E/AndroidRuntime(684): at java.lang.reflect.Method.invokeNative(Native Method) 09-05 02:25:32.849: E/AndroidRuntime(684): at java.lang.reflect.Method.invoke(Method.java:511) 09-05 02:25:32.849: E/AndroidRuntime(684): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 09-05 02:25:32.849: E/AndroidRuntime(684): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 09-05 02:25:32.849: E/AndroidRuntime(684): at dalvik.system.NativeStart.main(Native Method) Thanks

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  • Sqlite Database LEAK FOUND exception in android?

    - by androidbase
    hi all, i am getting this exception in database Leak Found my LOGCAT Shows this: 02-17 17:20:37.857: INFO/ActivityManager(58): Starting activity: Intent { cmp=com.example.brown/.Bru_Bears_Womens_View (has extras) } 02-17 17:20:38.477: DEBUG/dalvikvm(434): GC freed 1086 objects / 63888 bytes in 119ms 02-17 17:20:38.556: ERROR/Database(434): Leak found 02-17 17:20:38.556: ERROR/Database(434): java.lang.IllegalStateException: /data/data/com.example.brown/databases/BRUNEWS_DB_01.db SQLiteDatabase created and never closed 02-17 17:20:38.556: ERROR/Database(434): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1694) 02-17 17:20:38.556: ERROR/Database(434): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:738) 02-17 17:20:38.556: ERROR/Database(434): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:760) 02-17 17:20:38.556: ERROR/Database(434): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:753) 02-17 17:20:38.556: ERROR/Database(434): at android.app.ApplicationContext.openOrCreateDatabase(ApplicationContext.java:473) 02-17 17:20:38.556: ERROR/Database(434): at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:193) 02-17 17:20:38.556: ERROR/Database(434): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:98) 02-17 17:20:38.556: ERROR/Database(434): at com.example.brown.Brown_Splash.onCreate(Brown_Splash.java:52) 02-17 17:20:38.556: ERROR/Database(434): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 02-17 17:20:38.556: ERROR/Database(434): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459) 02-17 17:20:38.556: ERROR/Database(434): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512) 02-17 17:20:38.556: ERROR/Database(434): at android.app.ActivityThread.access$2200(ActivityThread.java:119) 02-17 17:20:38.556: ERROR/Database(434): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863) 02-17 17:20:38.556: ERROR/Database(434): at android.os.Handler.dispatchMessage(Handler.java:99) 02-17 17:20:38.556: ERROR/Database(434): at android.os.Looper.loop(Looper.java:123) 02-17 17:20:38.556: ERROR/Database(434): at android.app.ActivityThread.main(ActivityThread.java:4363) 02-17 17:20:38.556: ERROR/Database(434): at java.lang.reflect.Method.invokeNative(Native Method) 02-17 17:20:38.556: ERROR/Database(434): at java.lang.reflect.Method.invoke(Method.java:521) 02-17 17:20:38.556: ERROR/Database(434): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 02-17 17:20:38.556: ERROR/Database(434): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 02-17 17:20:38.556: ERROR/Database(434): at dalvik.system.NativeStart.main(Native Method) how can i solve it??? thanks in advance...

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  • jqGrid using a servlet to store the data, how to access the data from a different java class

    - by Sam
    I'm using jqGrid for a table input and setting up the url as a servlet which will deal with the GET and POST requests and save the rows to a Java object. I'm using webwork web framework and I was wondering how I can get access to the object that the servlet is saving the data to. One way I have thought of is to just call the GET method from the Java action class which the servlet will return a JSON string with the object data. Is there a better design for doing this? This is probably not too clear so ask questions so I can help get across my point. Thanks

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  • Android: ProgressDialog.show() crashes with getApplicationContext

    - by Felix
    I can't seem to grasp why this is happening. This code: mProgressDialog = ProgressDialog.show(this, "", getString(R.string.loading), true); works just fine. However, this code: mProgressDialog = ProgressDialog.show(getApplicationContext(), "", getString(R.string.loading), true); throws the following exception: W/WindowManager( 569): Attempted to add window with non-application token WindowToken{438bee58 token=null}. Aborting. D/AndroidRuntime( 2049): Shutting down VM W/dalvikvm( 2049): threadid=3: thread exiting with uncaught exception (group=0x4001aa28) E/AndroidRuntime( 2049): Uncaught handler: thread main exiting due to uncaught exception E/AndroidRuntime( 2049): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.tastekid.TasteKid/com.tastekid.TasteKid.YouTube}: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application E/AndroidRuntime( 2049): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401) E/AndroidRuntime( 2049): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417) E/AndroidRuntime( 2049): at android.app.ActivityThread.access$2100(ActivityThread.java:116) E/AndroidRuntime( 2049): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794) E/AndroidRuntime( 2049): at android.os.Handler.dispatchMessage(Handler.java:99) E/AndroidRuntime( 2049): at android.os.Looper.loop(Looper.java:123) E/AndroidRuntime( 2049): at android.app.ActivityThread.main(ActivityThread.java:4203) E/AndroidRuntime( 2049): at java.lang.reflect.Method.invokeNative(Native Method) E/AndroidRuntime( 2049): at java.lang.reflect.Method.invoke(Method.java:521) E/AndroidRuntime( 2049): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) E/AndroidRuntime( 2049): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) E/AndroidRuntime( 2049): at dalvik.system.NativeStart.main(Native Method) E/AndroidRuntime( 2049): Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application E/AndroidRuntime( 2049): at android.view.ViewRoot.setView(ViewRoot.java:460) E/AndroidRuntime( 2049): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177) E/AndroidRuntime( 2049): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91) E/AndroidRuntime( 2049): at android.app.Dialog.show(Dialog.java:238) E/AndroidRuntime( 2049): at android.app.ProgressDialog.show(ProgressDialog.java:107) E/AndroidRuntime( 2049): at android.app.ProgressDialog.show(ProgressDialog.java:90) E/AndroidRuntime( 2049): at com.tastekid.TasteKid.YouTube.onCreate(YouTube.java:45) E/AndroidRuntime( 2049): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123) E/AndroidRuntime( 2049): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364) E/AndroidRuntime( 2049): ... 11 more Any ideas why this is happening? I'm calling this from the onCreate method.

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  • How do I configure CI hudson with PHPunit and how do I run phpunit using hudson?

    - by Vinesh
    Hi, I am getting following error mentioned below. Help is much needed for this... kindly go through the errors. Started by an SCM change Updating https://suppliesguys.unfuddle.com/svn/suppliesguys_frontend2/Frontend-Texity/src U sites\all\modules\print\print_pdf\print_pdf.pages.inc At revision 1134 [workspace] $ sh -xe C:\WINDOWS\TEMP\hudson6292587174545072503.sh The system cannot find the file specified FATAL: command execution failed java.io.IOException: Cannot run program "sh" (in directory "E:\Projects\Hudson.hudson\jobs\TSG\workspace"): CreateProcess error=2, The system cannot find the file specified at java.lang.ProcessBuilder.start(Unknown Source) at hudson.Proc$LocalProc.(Proc.java:149) at hudson.Proc$LocalProc.(Proc.java:121) at hudson.Launcher$LocalLauncher.launch(Launcher.java:636) at hudson.Launcher$ProcStarter.start(Launcher.java:271) at hudson.Launcher$ProcStarter.join(Launcher.java:278) at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:83) at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:58) at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19) at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:584) at hudson.model.Build$RunnerImpl.build(Build.java:174) at hudson.model.Build$RunnerImpl.doRun(Build.java:138) at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:416) at hudson.model.Run.run(Run.java:1244) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46) at hudson.model.ResourceController.execute(ResourceController.java:88) at hudson.model.Executor.run(Executor.java:122) Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified at java.lang.ProcessImpl.create(Native Method) at java.lang.ProcessImpl.(Unknown Source) at java.lang.ProcessImpl.start(Unknown Source) ... 17 more Publishing Javadoc Publishing Clover coverage report... No Clover report will be published due to a Build Failure [xUnit] Starting to record. [xUnit] [PHPUnit] - Use the embedded style sheet. [xUnit] [ERROR] - No test report file(s) were found with the pattern 'build/logs/phpunit.xml' relative to 'E:\Projects\Hudson.hudson\jobs\TSG\workspace' for the testing framework 'PHPUnit'. Did you enter a pattern relative to the correct directory? Did you generate the result report(s) for 'PHPUnit'? [xUnit] Stopping recording. Finished: FAILURE

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  • How to invite users to connect to your application using Facebook Application Development interfaces

    - by rabashani
    I think that this question already questioned, and probably the answer is here: http://wiki.developers.facebook.com/index.php/Notifications.send but the real problem is that facebook says: Facebook discontinued support for this method March 1, 2010. Calling this method returns error code 3 -- Unknown method. while, I couldn't find any other JS-api for the invitation, anyone know how we can invite users, using the JS api or the .net api? thanks.

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  • Oracle JDBC connection with Weblogic 10 datasource mapping, giving problem java.sql.SQLException: Cl

    - by gauravkarnatak
    Oracle JDBC connection with Weblogic 10 datasource mapping, giving problem java.sql.SQLException: Closed Connection I am using weblogic 10 JNDI datasource to create JDBC connections, below is my config http://www.bea.com/ns/weblogic/920.xsd" XL-Reference-DS jdbc:oracle:oci:@abc.XL.COM oracle.jdbc.driver.OracleDriver user DEV_260908 password password dll ocijdbc10 protocol oci oracle.jdbc.V8Compatible true baseDriverClass oracle.jdbc.driver.OracleDriver 1 100 1 true SQL SELECT 1 FROM DUAL ReferenceData OnePhaseCommit When I run a bulk task where there are lotsa connection made and closed, sometimes it gives connection closed exception for any of the task in the bulk task. Below is detailed exception' java.sql.SQLException: Closed Connection at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:111) at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:145) at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:207) at oracle.jdbc.driver.OracleStatement.ensureOpen(OracleStatement.java:3512) at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3265) at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:3367) Any pointers ? Thanks in advance, Gaurav

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  • What is the best resizable circular byte buffer available in Java?

    - by Wouter Lievens
    I need a byte buffer class in Java for single-threaded use. I should be able to insert data at the back of the buffer and read data at the front, with an amortized cost of O(1). The buffer should resize when it's full, rather than throw an exception or something. I could write one myself, but I'd be very surprised if this didn't exist yet in a standard Java package, and if it doesn't, I'd expect it to exist in some well-tested public library. What would you recommend?

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  • Refactoring multiple interfaces to a common interface using MVVM, MEF and Silverlight4

    - by Brian
    I am just learning MVVM with MEF and already see the benefits but I am a little confused about some implementation details. The app I am building has several Models that do the same with with different entities (WCF RIA Services exposing a Entity framework object) and I would like to avoid implementing a similar interface/model for each view I need and the following is what I have come up with though it currently doesn't work. The common interface has a new completed event for each model that implements the base model, this was the easiest way I could implement a common class as the compiler did not like casting from a child to the base type. The code as it currently sits compiles and runs but the is a null IModel being passed into the [ImportingConstructor] for the FaqViewModel class. I have a common interface (simplified for posting) defined as follows, this should look familiar to those who have seen Shawn Wildermuth's RIAXboxGames sample. public interface IModel { void GetItemsAsync(); event EventHandler<EntityResultsArgs<faq>> GetFaqsComplete; } A base method that implements the interface public class ModelBase : IModel { public virtual void GetItemsAsync() { } public virtual event EventHandler<EntityResultsArgs<faq>> GetFaqsComplete; protected void PerformQuery<T>(EntityQuery<T> qry, EventHandler<EntityResultsArgs<T>> evt) where T : Entity { Context.Load(qry, r => { if (evt == null) return; try { if (r.HasError) { evt(this, new EntityResultsArgs<T>(r.Error)); } else if (r.Entities.Count() > 0) { evt(this, new EntityResultsArgs<T>(r.Entities)); } } catch (Exception ex) { evt(this, new EntityResultsArgs<T>(ex)); } }, null); } private DomainContext _domainContext; protected DomainContext Context { get { if (_domainContext == null) { _domainContext = new DomainContext(); _domainContext.PropertyChanged += DomainContext_PropertyChanged; } return _domainContext; } } void DomainContext_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e) { switch (e.PropertyName) { case "IsLoading": AppMessages.IsBusyMessage.Send(_domainContext.IsLoading); break; case "IsSubmitting": AppMessages.IsBusyMessage.Send(_domainContext.IsSubmitting); break; } } } A model that implements the base model [Export(ViewModelTypes.FaqViewModel, typeof(IModel))] public class FaqModel : ModelBase { public override void GetItemsAsync() { PerformQuery(Context.GetFaqsQuery(), GetFaqsComplete); } public override event EventHandler<EntityResultsArgs<faq>> GetFaqsComplete; } A view model [PartCreationPolicy(CreationPolicy.NonShared)] [Export(ViewModelTypes.FaqViewModel)] public class FaqViewModel : MyViewModelBase { private readonly IModel _model; [ImportingConstructor] public FaqViewModel(IModel model) { _model = model; _model.GetFaqsComplete += Model_GetFaqsComplete; _model.GetItemsAsync(); // Load FAQS on creation } private IEnumerable<faq> _faqs; public IEnumerable<faq> Faqs { get { return _faqs; } private set { if (value == _faqs) return; _faqs = value; RaisePropertyChanged("Faqs"); } } private faq _currentFaq; public faq CurrentFaq { get { return _currentFaq; } set { if (value == _currentFaq) return; _currentFaq = value; RaisePropertyChanged("CurrentFaq"); } } public void GetFaqsAsync() { _model.GetItemsAsync(); } void Model_GetFaqsComplete(object sender, EntityResultsArgs<faq> e) { if (e.Error != null) { ErrorMessage = e.Error.Message; } else { Faqs = e.Results; } } } And then finally the Silverlight view itself public partial class FrequentlyAskedQuestions { public FrequentlyAskedQuestions() { InitializeComponent(); if (!ViewModelBase.IsInDesignModeStatic) { // Use MEF To load the View Model CompositionInitializer.SatisfyImports(this); } } [Import(ViewModelTypes.FaqViewModel)] public object ViewModel { set { DataContext = value; } } }

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  • Java Swing GUI Question: Open new panel with button clicked.

    - by bat
    Java Swing GUI: I am using ActionListener to preform the action when a button is clicked. What i want to do is when a button is clicked, open a new panel, but load/get the new panel from a different file. This is what i have so far but i rather just link to another file. THANKS! =] public void actionPerformed(java.awt.event.ActionEvent e) { //LINK TO NEW FILE INSEAD OF... JFrame frame2 = new JFrame("Clicked"); frame2.setVisible(true); frame2.setSize(200,200); }

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  • Complex Types, ModelBinders and Interfaces

    - by Kieron
    Hi, I've a scenario where I need to bind to an interface - in order to create the correct type, I've got a custom model binder that knows how to create the correct concrete type (which can differ). However, the type created never has the fields correctly filled in. I know I'm missing something blindingly simple here, but can anyone tell me why or at least what I need to do for the model binder to carry on it's work and bind the properties? public class ProductModelBinder : DefaultModelBinder { override public object BindModel (ControllerContext controllerContext, ModelBindingContext bindingContext) { if (bindingContext.ModelType == typeof (IProduct)) { var content = GetProduct (bindingContext); return content; } var result = base.BindModel (controllerContext, bindingContext); return result; } IProduct GetProduct (ModelBindingContext bindingContext) { var idProvider = bindingContext.ValueProvider.GetValue ("Id"); var id = (Guid)idProvider.ConvertTo (typeof (Guid)); var repository = RepositoryFactory.GetRepository<IProductRepository> (); var product = repository.Get (id); return product; } } The Model in my case is a complex type that has an IProduct property, and it's those values I need filled in. Model: [ProductBinder] public class Edit : IProductModel { public Guid Id { get; set; } public byte[] Version { get; set; } public IProduct Product { get; set; } }

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  • SIP and Java, where to start and with what?

    - by Senne
    I want to implement the SIP protocol in java and would want to be able to create different clients (5 or more) and make them connect to a proxy server. This is all for testing purposes so I would like to be able to see well what's happening on a rather low level. The clients should first be able to communicate trough text and later on maybe also by audio. (If I ever get that far) I already read a bit about the JAIN libraries and what I understood from that is that they are not really well suited for the server side? I also didn't really find any proxy server examples, tutorials, using JAIN. I also found this SIP Servlet Tutorial book, I used HTTP servlets in the past but should I prefer servlets or JAIN or ...? I'm quite new to SIP so I don't really know where to start or what to choose in combination with java.

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  • How do I learn Java EE? Where to start?

    - by bloodagar
    I'm going to be honest with you guys. I want to learn Java EE (and its related technologies) because it offers a lot of job opportunities here (the Philippines) and abroad. The problem is I don't know where to start and what to read or where to learn from. I'm almost finished reading Head First Java and I'm liking the language so far. Any tips that would increase my chances of finding a job would be greatly appreciated. Thanks in advance!

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  • Tips on creating user interfaces and optimizing the user experience

    - by Saif Bechan
    I am currently working on a project where a lot of user interaction is going to take place. There is also a commercial side as people can buy certain items and services. In my opinion a good blend of user interface, speed and security is essential for these types of websites. It is fairly easy to use ajax and JavaScript nowadays to do almost everything, as there are a lot of libraries available such as jQuery and others. But this can have some performance and incompatibility issues. This can lead to users just going to the next website. The overall look of the website is important too. Where to place certain buttons, where to place certain types of articles such as faq and support. Where and how to display error messages so that the user sees them but are not bothering him. And an overall color scheme is important too. The basic question is: How to create an interface that triggers a user to buy/use your services I know psychology also plays a huge role in how users interact with your website. The color scheme for example is important. When the colors are irritating on a website you just want to click away. I have not found any articles that explain those concept. Does anyone have any tips and/or recourses where i can get some articles that guide you in making the correct choices for your website.

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