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  • NetBeans IDE 7.3 Knows Null

    - by Geertjan
    What's the difference between these two methods, "test1" and "test2"? public int test1(String str) {     return str.length(); } public int test2(String str) {     if (str == null) {         System.err.println("Passed null!.");         //forgotten return;     }     return str.length(); } The difference, or at least, the difference that is relevant for this blog entry, is that whoever wrote "test2" apparently thinks that the variable "str" may be null, though did not provide a null check. In NetBeans IDE 7.3, you see this hint for "test2", but no hint for "test1", since in that case we don't know anything about the developer's intention for the variable and providing a hint in that case would flood the source code with too many false positives:  Annotations are supported in understanding how a piece of code is intended to be used. If method return types use @Nullable, @NullAllowed, @CheckForNull, the value is considered to be "strongly possible to be null", as well as if the variable is tested to be null, as shown above. When using @NotNull, @NonNull, @Nonnull, the value is considered to be non-null. (The exact FQNs of the annotations are ignored, only simple names are checked.) Here are examples showing where the hints are displayed for the non-null hints (the "strongly possible to be null" hints are not shown below, though you can see one of them in the screenshot above), together with a comment showing what is shown when you hover over the hint: There isn't a "one size fits all" refactoring for these various instances relating to null checks, hence you can't do an automated refactoring across your code base via tools in NetBeans IDE, as shown yesterday for class member reordering across code bases. However, you can, instead, go to Source | Inspect and then do a scan throughout a scope (e.g., current file/package/project or combinations of these or all open projects) for class elements that the IDE identifies as potentially having a problem in this area: Thanks to Jan Lahoda, who reports that this currently also works in NetBeans IDE 7.3 dev builds for fields but that may need to be disabled since right now too many false positives are returned, for help with the info above and any misunderstandings are my own fault!

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  • Unconventional webapps con GWT/Elemental WebRTC e WebGL (parte 2)

    Unconventional webapps con GWT/Elemental WebRTC e WebGL (parte 2) Seconda parte del'intervento di Alberto Mancini del GDG Firenze: realizzata l'app di base, grazie a GWT e NyARToolkit, sarà possibile aggiungere della realtà aumentata direttamente sullo streaming video utilizzando dei marker. Post con esempi di codice all'indirizzo jooink.blogspot.it From: GoogleDevelopers Views: 28 2 ratings Time: 19:08 More in Science & Technology

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  • Google I/O 2012 - Writing Efficient Drive Apps for Android

    Google I/O 2012 - Writing Efficient Drive Apps for Android Alain Vongsouvanh, Claudio Cherubino This session goes through how to write Drive apps that synchronize files with Android devices. We'll also go into how to open files on Android devices, or create new files from this environment. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 234 5 ratings Time: 52:45 More in Science & Technology

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  • Google I/O 2012 - YouTube API + Cloud Rendering = Happy Mobile Gamers

    Google I/O 2012 - YouTube API + Cloud Rendering = Happy Mobile Gamers Jarek Wilkiewicz, Danny Hermes YouTube is one of the top destinations for gamers. Many console developers already incorporate video recording and uploading directly into their titles, but uploading to YouTube from a mobile game presents a unique set of challenges. Come and learn how the YouTube API combined with cloud computing can help enable video uploads in your mobile game. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 100 0 ratings Time: 57:05 More in Science & Technology

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  • GDL Presents: Creative Sandbox | Geo API

    GDL Presents: Creative Sandbox | Geo API Tune in to hear about two cool, innovative campaigns that use the Geo API, Nature Valley Trail View and Band of Bridges, from the core creative teams at McCann Erickson NY, Goodby Silverstein & Partners and Famous Interactive in conversation with a Google Maps product expert. They'll talk about how they pushed the possibilities of the Geo API - and will inspire you to do the same. From: GoogleDevelopers Views: 0 0 ratings Time: 01:00:00 More in Science & Technology

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  • Dealing with coworkers when developing, need advice [closed]

    - by Yippie-Kai-Yay
    I developed our current project architecture and started developing it on my own (reaching something like, revision 40). We're developing a simple subway routing framework and my design seemed to be done extremely well - several main models, corresponding views, main logic and data structures were modeled "as they should be" and fully separated from rendering, algorithmic part was also implemented apart from the main models and had a minor number of intersection points. I would call that design scalable, customizable, easy-to-implement, interacting mostly based on the "black box interaction" and, well, very nice. Now, what was done: I started some implementations of the corresponding interfaces, ported some convenient libraries and wrote implementation stubs for some application parts. I had the document describing coding style and examples of that coding style usage (my own written code). I forced the usage of more or less modern C++ development techniques, including no-delete code (wrapped via smart pointers) and etc. I documented the purpose of concrete interface implementations and how they should be used. Unit tests (mostly, integration tests, because there wasn't a lot of "actual" code) and a set of mocks for all the core abstractions. I was absent for 12 days. What do we have now (the project was developed by 4 other members of the team): 3 different coding styles all over the project (I guess, two of them agreed to use the same style :), same applies to the naming of our abstractions (e.g CommonPathData.h, SubwaySchemeStructures.h), which are basically headers declaring some data structures. Absolute lack of documentation for the recently implemented parts. What I could recently call a single-purpose-abstraction now handles at least 2 different types of events, has tight coupling with other parts and so on. Half of the used interfaces now contain member variables (sic!). Raw pointer usage almost everywhere. Unit tests disabled, because "(Rev.57) They are unnecessary for this project". ... (that's probably not everything). Commit history shows that my design was interpreted as an overkill and people started combining it with personal bicycles and reimplemented wheels and then had problems integrating code chunks. Now - the project still does only a small amount of what it has to do, we have severe integration problems, I assume some memory leaks. Is there anything possible to do in this case? I do realize that all my efforts didn't have any benefit, but the deadline is pretty soon and we have to do something. Did someone have a similar situation? Basically I thought that a good (well, I did everything that I could) start for the project would probably lead to something nice, however, I understand that I'm wrong. Any advice would be appreciated, sorry for my bad english.

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  • Getting Started Plugging into the "Find in Projects" Dialog

    - by Geertjan
    In case you missed it amidst all the code in yesterday's blog entry, the "Find in Projects" dialog is now pluggable. I think that's really cool. The code yesterday gives you a complete example, but let's break it down a bit and deconstruct down to a very simple hello world scenario. We'll end up with as many extra tabs in the "Find in Projects" dialog as we need, for example, three in this case:  And clicking on any of those extra tabs will, in this simple example, simply show us this: Once we have that, we'll be able to continue adding small bits of code over the next few blog entries until we have something more useful. So, in this blog entry, you'll literally be able to display "Hello World" within a new tab in the "Find in Projects" dialog: import javax.swing.JComponent; import javax.swing.JLabel; import org.netbeans.spi.search.provider.SearchComposition; import org.netbeans.spi.search.provider.SearchProvider; import org.netbeans.spi.search.provider.SearchProvider.Presenter; import org.openide.NotificationLineSupport; import org.openide.util.lookup.ServiceProvider; @ServiceProvider(service = SearchProvider.class) public class ExampleSearchProvider1 extends SearchProvider { @Override public Presenter createPresenter(boolean replaceMode) { return new ExampleSearchPresenter(this); } @Override public boolean isReplaceSupported() { return false; } @Override public boolean isEnabled() { return true; } @Override public String getTitle() { return "Demo Extension 1"; } public class ExampleSearchPresenter extends SearchProvider.Presenter { private ExampleSearchPresenter(ExampleSearchProvider1 sp) { super(sp, true); } @Override public JComponent getForm() { return new JLabel("Hello World"); } @Override public SearchComposition composeSearch() { return null; } @Override public boolean isUsable(NotificationLineSupport nls) { return true; } } } That's it, not much code, works fine in NetBeans IDE 7.2 Beta, and is easier to digest than the big chunk from yesterday. If you make three classes like the above in a NetBeans module, and you install it, you'll have three new tabs in the "Find in Projects" dialog. The only required dependencies are Dialogs API, Lookup API, and Search in Projects API. Read the javadoc linked above and then in next blog entries we'll continue to build out something like the sample you saw in yesterday's blog entry.

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  • Google I/O 2012 - Meet the Go Team

    Google I/O 2012 - Meet the Go Team Andrew Gerrand , Rob Pike The Go programming language is an open source project to make programmers more productive. Go is expressive, concise, clean, and efficient. It's a fast, statically typed, compiled language that feels like a dynamically typed, interpreted language. In this fireside chat, Have your Go questions answered by the gophers themselves. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 168 11 ratings Time: 01:00:29 More in Science & Technology

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  • Using runtime generic type reflection to build a smarter DAO

    - by kerry
    Have you ever wished you could get the runtime type of your generic class? I wonder why they didn’t put this in the language. It is possible, however, with reflection: Consider a data access object (DAO) (note: I had to use brackets b/c the arrows were messing with wordpress): public interface Identifiable { public Long getId(); } public interface Dao { public T findById(Long id); public void save(T obj); public void delete(T obj); } Using reflection, we can create a DAO implementation base class, HibernateDao, that will work for any object: import java.lang.reflect.Field; import java.lang.reflect.ParameterizedType; public class HibernateDao implements Dao { private final Class clazz; public HibernateDao(Session session) { // the magic ParameterizedType parameterizedType = (ParameterizedType) clazz.getGenericSuperclass(); return (Class) parameterizedType.getActualTypeArguments()[0]; } public T findById(Long id) { return session.get(clazz, id); } public void save(T obj) { session.saveOrUpdate(obj); } public void delete(T obj) { session.delete(obj); } } Then, all we have to do is extend from the class: public class BookDaoHibernateImpl extends HibernateDao { }

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  • GDL Presents: All the Web's a Stage

    GDL Presents: All the Web's a Stage All the Web's a Stage: Building a 3D Space in the Browser Thursday, October 11 - 10:30AM PDT Meet the designers and creative team behind a new sensory Chrome experiment, Movi.Kanti.Revo, in a live, design-focused Q&A. Learn how Cirque du Soleil and Subatomic Systems worked to translate the wonder of Cirque into an environment built entirely with markup and CSS. Host: Pete LePage, Developer Advocate Guests: Gillian Ferrabee, Cirque du Soleil | Nicole McDonald, Director/Creative Director, Subatomic Systems From: GoogleDevelopers Views: 0 0 ratings Time: 00:00 More in Science & Technology

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  • Google I/O 2012 - Computing Map Tiles with Go on App Engine

    Google I/O 2012 - Computing Map Tiles with Go on App Engine Chris Broadfoot, Andrew Gerrand In this talk we use the Maps API and Go on App Engine to build an app to build custom tile sets for Google Maps. The app demonstrates using Go's suitability for computation in the cloud and App Engine's key scalability features, such as Task Queues and Backends. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 1170 21 ratings Time: 47:22 More in Science & Technology

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  • Google I/O 2012 - So You've Read the Design Guide; Now What?

    Google I/O 2012 - So You've Read the Design Guide; Now What? Daniel Lehmann, Tor Norbye, Richard Ngo The Android Design Guide describes how to design beautiful Android apps, but not how to build them. In this talk we'll give practical tips for how to apply fit & finish as you are implementing your design, we'll show you how to avoid some common pitfalls, we'll describe some useful patterns, and show you how tools can help. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 38 1 ratings Time: 56:31 More in Science & Technology

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