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POAttempting to get class name on Android using getClassContext()[1].getName()
 

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  1. POAttempting to get class name on Android using getClassContext()[1].getName()
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    <p>I have the following bit of code, used on Android and tested quite extensively about 6 months ago. It has been working fine and has never been the cause of any problems.</p> <pre><code>private static class CurrentClassGetter extends SecurityManager { public String getClassName() { return getClassContext()[1].getName(); } } </code></pre> <p>The calling code:</p> <pre><code> //---Get my name (last part of class name) System.out.println("Attempting to get class name"); msSimpleName = new CurrentClassGetter().getClassName(); </code></pre> <p>Which, I notice, is the exact same bit of code recommended by someone in this SO answer here:</p> <p><a href="https://stackoverflow.com/questions/936684/getting-the-class-name-from-a-static-method-in-java">Getting the class name from a static method in Java</a></p> <p>Since this code was written, I've updated my Android SDK from r14 to r16. I also downloaded all of the newer SDK packages, from API10 (Android 2.3.3) to API15 (Android 4.0.3). However, the above code which was working fine is now throwing this error:</p> <pre><code>02-22 16:18:26.779: W/System.err(2593): java.lang.NullPointerException 02-22 16:18:26.786: W/System.err(2593): at com.company.myCompany.mobile.android.myCompanyApp$CurrentClassGetter.getClassName(myCompanyApp.java:413) 02-22 16:18:26.806: W/System.err(2593): at com.company.myCompany.mobile.android.myCompanyApp.monitor(myCompanyApp.java:289) 02-22 16:18:26.806: W/System.err(2593): at com.company.myCompany.mobile.android.myCompanyApp.monitor(myCompanyApp.java:257) 02-22 16:18:26.826: W/System.err(2593): at com.gomez.appname.appnameActivity.onCreate(appnameActivity.java:22) 02-22 16:18:26.836: W/System.err(2593): at android.app.Activity.performCreate(Activity.java:4465) 02-22 16:18:26.846: W/System.err(2593): at android.app.InstAppentation.callActivityOnCreate(InstAppentation.java:1049) 02-22 16:18:26.856: W/System.err(2593): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 02-22 16:18:26.866: W/System.err(2593): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 02-22 16:18:26.876: W/System.err(2593): at android.app.ActivityThread.access$600(ActivityThread.java:123) 02-22 16:18:26.876: W/System.err(2593): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 02-22 16:18:26.896: W/System.err(2593): at android.os.Handler.dispatchMessage(Handler.java:99) 02-22 16:18:26.896: W/System.err(2593): at android.os.Looper.loop(Looper.java:137) 02-22 16:18:26.906: W/System.err(2593): at android.app.ActivityThread.main(ActivityThread.java:4424) 02-22 16:18:26.926: W/System.err(2593): at java.lang.reflect.Method.invokeNative(Native Method) 02-22 16:18:26.926: W/System.err(2593): at java.lang.reflect.Method.invoke(Method.java:511) 02-22 16:18:26.946: W/System.err(2593): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 02-22 16:18:26.946: W/System.err(2593): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 02-22 16:18:26.956: W/System.err(2593): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>Basically, what you're looking at is a call from onCreate in Android to my private API. Within the API, it's trying to get the current class name using the above code.</p> <p>The Target API version was 8 then and it's 8 now (Android v2.2), so that has not changed at all. Java compliance level 1.6, running Java 1.6.0_24 64-bit.</p> <p>Does anyone know why getClassContext()[1].getName() would be throwing a NullPointerException like this all of a sudden, when it worked before?</p>
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    1. CODid you try to remove Android SDK v16 from your machine and install the v14 again to confirm that SDK version is the only difference?
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    2. COWorking on that now, on a clean machine (I need v16 for other stuff as well so I can't remove it from this system). It takes a surprisingly long time to download all of different pieces of the SDK.
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    3. COBased on what I'm seeing so far, the context from which the array of classes is derived is empty within getClassName(). I don't think it used to be like this. Outside of the call to getClassName(), I can see a ton of stuff in "this". Within the call, totally empty.
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