You need to use a Lock such as: http://developer.android.com/reference/java/util/concurrent/locks/ReentrantLock.html This sounds like a race conditions, as others have pointed out. These are usually the hardest to narrow down.
Static variables are not a good idea in general unless you know exactly what you're doing. Try adding a lock around your static object, like: private static Object mMyProtectedVar; private final Lock mLock = new ReentrantLock(); Then before touching the variable, ALWAYS use the lock like so: mLock.lock(); mMyProtectedVar.something = something; mLock.unlock(); Java provides some keywords for making variables and methods thread safe, although I find a lock to be really clear as to its intended purpose. On Sat, Oct 1, 2011 at 6:42 PM, Doug <[email protected]> wrote: > On Sep 27, 4:23 pm, sebastian_bugiu > <[email protected]> wrote: >> I have an application in android market that does not work on htc >> desire and I am positive the issue is not in my code. Basically I have >> a private static final field that is initialized to a reference to an >> object and yet whenever I access that object from another thread it >> throws a NullPointerException even though it is initialized. > > Are you sure you were really using private static final? Static > finals are initialized when the class loads and will never change as > long as that class remains loaded. All threads would be seeing the > same value the entire time. > > The other code you showed can have a race condition in that first > thread that assigns status may not have reconciled its local copy of > the new Status object by the time the second thread tries to access > it. You would need to synchronize both accesses or use volatile to > keep them in sync. > > You are almost certainly not running into an HTC error. > > Doug > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en -- ~ Jeremiah:9:23-24 Android 2D MMORPG: http://solrpg.com/, http://www.youtube.com/user/revoltingx -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
