Hi I am getting the below error while parsing JSON. MY CODE:
Overridden method in POJO RootCategories; public String toString(){ return "Category ID: " + catId + "Category Name: " + catName + "Description: " + description + "isPP: " + isPP + "isRootCategory: " + isRootCategory + "isTerminalCategory: " + isTerminalCategory; } Parser in my Activity: private List<RootCategories> parse(String jsonString) throws Exception { java.lang.reflect.Type collectionType = new TypeToken<List<RootCategories>>() { }.getType(); List<RootCategories> rootCategories = new Gson().fromJson(jsonString, collectionType); return rootCategories; } Please help Thanks Suneel 07-08 19:21:00.016: WARN/ActivityManager(69): Launch timeout has expired, giving up wake lock! 07-08 19:21:00.367: WARN/ActivityManager(69): Activity idle timeout for HistoryRecord{43f8ed70 com.jcp.androidpoc/.CategoryHomeActivity} 07-08 19:21:09.537: DEBUG/dalvikvm(1072): JDWP invocation returning with exceptObj=0x43e270c0 (Ljava/lang/NullPointerException;) 07-08 19:21:15.967: DEBUG/dalvikvm(1072): GC_FOR_MALLOC freed 2799 objects / 181800 bytes in 127ms 07-08 19:21:16.228: WARN/System.err(1072): java.lang.NullPointerException 07-08 19:21:16.247: WARN/System.err(1072): at org.apache.harmony.luni.lang.reflect.ListOfTypes.length(ListOfTypes.java: 47) 07-08 19:21:16.268: WARN/System.err(1072): at org.apache.harmony.luni.lang.reflect.ImplForType.toString(ImplForType.java: 83) 07-08 19:21:16.286: WARN/System.err(1072): at java.lang.StringBuilder.append(StringBuilder.java:203) 07-08 19:21:16.306: WARN/System.err(1072): at com.google.gson.JsonDeserializerExceptionWrapper.deserialize(JsonDeserializerExceptionWrapper.java: 56) 07-08 19:21:16.327: WARN/System.err(1072): at com.google.gson.JsonDeserializationVisitor.visitUsingCustomHandler(JsonDeserializationVisitor.java: 65) 07-08 19:21:16.327: WARN/System.err(1072): at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:96) 07-08 19:21:16.356: WARN/System.err(1072): at com.google.gson.JsonDeserializationContextDefault.fromJsonObject(JsonDeserializationContextDefault.java: 73) 07-08 19:21:16.398: WARN/System.err(1072): at com.google.gson.JsonDeserializationContextDefault.deserialize(JsonDeserializationContextDefault.java: 49) 07-08 19:21:16.427: WARN/System.err(1072): at com.google.gson.Gson.fromJson(Gson.java:379) 07-08 19:21:16.457: WARN/System.err(1072): at com.google.gson.Gson.fromJson(Gson.java:329) 07-08 19:21:16.487: WARN/System.err(1072): at com.jcp.androidpoc.CategoryHomeActivity.parse(CategoryHomeActivity.java: 137) 07-08 19:21:16.507: WARN/System.err(1072): at com.jcp.androidpoc.CategoryHomeActivity.onCreate(CategoryHomeActivity.java: 76) 07-08 19:21:16.547: WARN/System.err(1072): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java: 1047) 07-08 19:21:16.597: WARN/System.err(1072): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java: 2627) 07-08 19:21:16.607: WARN/System.err(1072): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java: 2679) 07-08 19:21:16.648: WARN/System.err(1072): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 07-08 19:21:16.677: WARN/System.err(1072): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 07-08 19:21:16.717: WARN/System.err(1072): at android.os.Handler.dispatchMessage(Handler.java:99) 07-08 19:21:16.756: WARN/System.err(1072): at android.os.Looper.loop(Looper.java:123) 07-08 19:21:16.807: WARN/System.err(1072): at android.app.ActivityThread.main(ActivityThread.java:4627) 07-08 19:21:16.818: WARN/System.err(1072): at java.lang.reflect.Method.invokeNative(Native Method) 07-08 19:21:16.846: WARN/System.err(1072): at java.lang.reflect.Method.invoke(Method.java:521) 07-08 19:21:16.867: WARN/System.err(1072): at com.android.internal.os.ZygoteInit $MethodAndArgsCaller.run(ZygoteInit.java:868) 07-08 19:21:16.887: WARN/System.err(1072): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 07-08 19:21:16.887: WARN/System.err(1072): at dalvik.system.NativeStart.main(Native Method) 07-08 19:21:00.016: WARN/ActivityManager(69): Launch timeout has expired, giving up wake lock! 07-08 19:21:00.367: WARN/ActivityManager(69): Activity idle timeout for HistoryRecord{43f8ed70 com.jcp.androidpoc/.CategoryHomeActivity} 07-08 19:21:09.537: DEBUG/dalvikvm(1072): JDWP invocation returning with exceptObj=0x43e270c0 (Ljava/lang/NullPointerException;) 07-08 19:21:15.967: DEBUG/dalvikvm(1072): GC_FOR_MALLOC freed 2799 objects / 181800 bytes in 127ms 07-08 19:21:16.228: WARN/System.err(1072): java.lang.NullPointerException 07-08 19:21:16.247: WARN/System.err(1072): at org.apache.harmony.luni.lang.reflect.ListOfTypes.length(ListOfTypes.java: 47) 07-08 19:21:16.268: WARN/System.err(1072): at org.apache.harmony.luni.lang.reflect.ImplForType.toString(ImplForType.java: 83) 07-08 19:21:16.286: WARN/System.err(1072): at java.lang.StringBuilder.append(StringBuilder.java:203) 07-08 19:21:16.306: WARN/System.err(1072): at com.google.gson.JsonDeserializerExceptionWrapper.deserialize(JsonDeserializerExceptionWrapper.java: 56) 07-08 19:21:16.327: WARN/System.err(1072): at com.google.gson.JsonDeserializationVisitor.visitUsingCustomHandler(JsonDeserializationVisitor.java: 65) 07-08 19:21:16.327: WARN/System.err(1072): at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:96) 07-08 19:21:16.356: WARN/System.err(1072): at com.google.gson.JsonDeserializationContextDefault.fromJsonObject(JsonDeserializationContextDefault.java: 73) 07-08 19:21:16.398: WARN/System.err(1072): at com.google.gson.JsonDeserializationContextDefault.deserialize(JsonDeserializationContextDefault.java: 49) 07-08 19:21:16.427: WARN/System.err(1072): at com.google.gson.Gson.fromJson(Gson.java:379) 07-08 19:21:16.457: WARN/System.err(1072): at com.google.gson.Gson.fromJson(Gson.java:329) 07-08 19:21:16.487: WARN/System.err(1072): at com.jcp.androidpoc.CategoryHomeActivity.parse(CategoryHomeActivity.java: 137) 07-08 19:21:16.507: WARN/System.err(1072): at com.jcp.androidpoc.CategoryHomeActivity.onCreate(CategoryHomeActivity.java: 76) 07-08 19:21:16.547: WARN/System.err(1072): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java: 1047) 07-08 19:21:16.597: WARN/System.err(1072): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java: 2627) 07-08 19:21:16.607: WARN/System.err(1072): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java: 2679) 07-08 19:21:16.648: WARN/System.err(1072): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 07-08 19:21:16.677: WARN/System.err(1072): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 07-08 19:21:16.717: WARN/System.err(1072): at android.os.Handler.dispatchMessage(Handler.java:99) 07-08 19:21:16.756: WARN/System.err(1072): at android.os.Looper.loop(Looper.java:123) 07-08 19:21:16.807: WARN/System.err(1072): at android.app.ActivityThread.main(ActivityThread.java:4627) 07-08 19:21:16.818: WARN/System.err(1072): at java.lang.reflect.Method.invokeNative(Native Method) 07-08 19:21:16.846: WARN/System.err(1072): at java.lang.reflect.Method.invoke(Method.java:521) 07-08 19:21:16.867: WARN/System.err(1072): at com.android.internal.os.ZygoteInit $MethodAndArgsCaller.run(ZygoteInit.java:868) 07-08 19:21:16.887: WARN/System.err(1072): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 07-08 19:21:16.887: WARN/System.err(1072): at dalvik.system.NativeStart.main(Native Method) 07-08 19:23:15.039: DEBUG/AndroidRuntime(1072): Shutting down VM 07-08 19:23:15.039: WARN/dalvikvm(1072): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): FATAL EXCEPTION: main 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.jcp.androidpoc/ com.jcp.androidpoc.CategoryHomeActivity}: java.lang.NullPointerException: println needs a message 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java: 2663) 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java: 2679) 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): at android.os.Handler.dispatchMessage(Handler.java:99) 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): at android.os.Looper.loop(Looper.java:123) 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): at android.app.ActivityThread.main(ActivityThread.java:4627) 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): at java.lang.reflect.Method.invokeNative(Native Method) 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): at java.lang.reflect.Method.invoke(Method.java:521) 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): at com.android.internal.os.ZygoteInit $MethodAndArgsCaller.run(ZygoteInit.java:868) 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): at dalvik.system.NativeStart.main(Native Method) 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): Caused by: java.lang.NullPointerException: println needs a message 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): at android.util.Log.println_native(Native Method) 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): at android.util.Log.e(Log.java:215) 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): at com.jcp.androidpoc.CategoryHomeActivity.onCreate(CategoryHomeActivity.java: 127) 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java: 1047) 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java: 2627) 07-08 19:23:15.307: ERROR/AndroidRuntime(1072): ... 11 more 07-08 19:23:15.537: WARN/ActivityManager(69): Force finishing activity com.jcp.androidpoc/.CategoryHomeActivity 07-08 19:23:16.106: WARN/ActivityManager(69): Activity pause timeout for HistoryRecord{43f8ed70 com.jcp.androidpoc/.CategoryHomeActivity} -- You received this message because you are subscribed to the Google Groups "Android Developers" group. 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