2.7.7.1 CRASH at XPRIZE sites java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.hashCode()' on a null object reference

[JackMostow]

Jo Grimstad [7:34 AM] 11/27/2018:

@kdeland @jack_mostow_robotutor Note that after your update, this crash report is being uploaded from your tablets:
CRASH_20181110_101607_5B13001251_release_2.7.7.1.txt
java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.hashCode()' on a null object reference
--------- Stack trace ---------
cmu.xprize.robotutor.tutorengine.CTutor.loadTutorGraph(CTutor.java:235)
cmu.xprize.robotutor.tutorengine.CTutor.inflateTutor(CTutor.java:209)
cmu.xprize.robotutor.tutorengine.CTutor.(CTutor.java:163)
cmu.xprize.robotutor.tutorengine.CTutorEngine.createAndLaunchTutor(CTutorEngine.java:356)
cmu.xprize.robotutor.tutorengine.CTutorEngine.startSessionManager(CTutorEngine.java:238)
cmu.xprize.robotutor.RoboTutor.onStartTutor(RoboTutor.java:614)
cmu.xprize.robotutor.RoboTutor.startEngine(RoboTutor.java:585)
cmu.xprize.robotutor.RoboTutor.onServiceReady(RoboTutor.java:532)
cmu.xprize.util.TTSsynthesizer.onInit(TTSsynthesizer.java:68)
android.speech.tts.TextToSpeech.dispatchOnInit(TextToSpeech.java:824)
android.speech.tts.TextToSpeech.-wrap4(TextToSpeech.java)
android.speech.tts.TextToSpeech$Connection$SetupConnectionAsyncTask.onPostExecute(TextToSpeech.java:2201)
android.speech.tts.TextToSpeech$Connection$SetupConnectionAsyncTask.onPostExecute(TextToSpeech.java:2195)
android.os.AsyncTask.finish(AsyncTask.java:667)
android.os.AsyncTask.-wrap1(AsyncTask.java)
android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:684)
android.os.Handler.dispatchMessage(Handler.java:102)
android.os.Looper.loop(Looper.java:154)
android.app.ActivityThread.main(ActivityThread.java:6119)
java.lang.reflect.Method.invoke(Native Method)
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

--------- Cause ---------

[JackMostow]

RoboTutor doesn't use TTS, so why is it initializing it??

cmu.xprize.util.TTSsynthesizer.onInit(TTSsynthesizer.java:68)
android.speech.tts.TextToSpeech.dispatchOnInit(TextToSpeech.java:824)

[JackMostow]

Caused by student exit?
CRASH_20181115_202603_6113001032_release_2.7.7.1.txt
after:
...
{"type":"LOG_DATA","tutor":"activity_selector","class":"TUTORSTATE","tag":"TSTag","time":"1542302174377","data":{"target":"activity_selector","type":"behavior","value":"GOODBYE_BUTTON_BEHAVIOR",".promptAudioI want to stop using RoboTutor":"",".buttonBehaviorSELECT_EXIT":"",".buttonidSbuttonExit":"",".helpAudioI want to stop using RoboTutor":""}},
{"type":"LOG_DATA","tutor":"activity_selector","class":"INFO","tag":"RTag","time":"1542302174504","data":{"target":"ctutor","action":"create","tutorname":"activity_selector"}},
{"class":"BATTERY","tag":"Battery","time":"1542302174507","percent":"0.81","chargeType":"UNPLUGGED"},
{"class":"ERROR","tag":"CTutor","type":"Exception","time":"1542302175161","msg":"ERROR: Non-ITutor child view in:activity_selector","exception":"java.lang.ClassCastException: android.view.SurfaceView cannot be cast to cmu.xprize.robotutor.tutorengine.ITutorObject"},
{"type":"LOG_DATA","tutor":"activity_selector","class":"INFO","tag":"RTag","time":"1542302175162","data":{"target":"ctutorgraph","action":"preenterscene","setdatasource":"[file]dev_data.json"}},
{"class":"VERBOSE","tag":"RTag","type":"TimeStamp","datetime":"11/15/2018 20:16:15","time":"1542302175820","data":{"RoboTutor":"SessionEnd"}},
{"end":"end"}]}

[kevindeland]

I added two new folders to Google Drive.

a_crash_examine_0941
a_crash_examine_2942

Each has a collection of all CRASH and PERF files logged between 11/15 and 11/16 for a given tablet.

Many of the CRASH logs contain the hashCode() error. The goal is to map each of these crashes to a corresponding PERF log.
Some of the CRASH logs contain the StringOutOfBoundsException error called from TBpComponent.trackAndLogPerformance(). These will each map to a PERF log that ends with a bpop.addsub activity. This relationship can be used as a sort of "ground truth" between the CRASH and the PERF logs.

[kevindeland]

For reference, here are the types of Crashes in each of the CRASH log files, where HASH indicates the crash mentioned here, STRING indicates the StringOutOfBoundsException, and MEM indicates an OutOfMemoryError.

2942

• CRASH_20181110_085415_6118002942_release_2.7.7.1 HASH
• CRASH_20181115_140436_6118002942_release_2.7.7.1 HASH
• CRASH_20181115_145629_6118002942_release_2.7.7.1 HASH
• CRASH_20181115_145748_6118002942_release_2.7.7.1 HASH
• CRASH_20181115_152530_6118002942_release_2.7.7.1 HASH
• CRASH_20181115_174326_6118002942_release_2.7.7.1 HASH
• CRASH_20181115_180426_6118002942_release_2.7.7.1 HASH
• CRASH_20181115_180612_6118002942_release_2.7.7.1 HASH
• CRASH_20181115_181442_6118002942_release_2.7.7.1 HASH
• CRASH_20181115_185640_6118002942_release_2.7.7.1 STRING
• CRASH_20181115_185704_6118002942_release_2.7.7.1 STRING
• CRASH_20181115_190651_6118002942_release_2.7.7.1 STRING
• CRASH_20181115_190814_6118002942_release_2.7.7.1 STRING
• CRASH_20181115_190854_6118002942_release_2.7.7.1 STRING
• CRASH_20181115_192455_6118002942_release_2.7.7.1 STRING
• CRASH_20181115_193509_6118002942_release_2.7.7.1 STRING
• CRASH_20181115_194146_6118002942_release_2.7.7.1 STRING
• CRASH_20181115_194228_6118002942_release_2.7.7.1 STRING
• CRASH_20181115_201746_6118002942_release_2.7.7.1 STRING
• CRASH_20181115_203536_6118002942_release_2.7.7.1 STRING
• CRASH_20181115_204122_6118002942_release_2.7.7.1 STRING
• CRASH_20181115_213426_6118002942_release_2.7.7.1 HASH
• CRASH_20181116_080655_6118002942_release_2.7.7.1 STRING
• CRASH_20181116_080841_6118002942_release_2.7.7.1 STRING
• CRASH_20181116_081452_6118002942_release_2.7.7.1 HASH
• CRASH_20181116_090544_6118002942_release_2.7.7.1 HASH

0941

• CRASH_20181110_085743_5A27000941_release_2.7.7.1 HASH
• CRASH_20181115_173753_5A27000941_release_2.7.7.1 HASH
• CRASH_20181115_174732_5A27000941_release_2.7.7.1 HASH
• CRASH_20181115_182024_5A27000941_release_2.7.7.1 HASH
• CRASH_20181115_184934_5A27000941_release_2.7.7.1 MEM
• CRASH_20181115_185149_5A27000941_release_2.7.7.1 HASH
• CRASH_20181115_185150_5A27000941_release_2.7.7.1 HASH
• CRASH_20181115_192830_5A27000941_release_2.7.7.1 HASH
• CRASH_20181115_200252_5A27000941_release_2.7.7.1 HASH
• CRASH_20181115_210153_5A27000941_release_2.7.7.1 MEM
• CRASH_20181115_211107_5A27000941_release_2.7.7.1 HASH
• CRASH_20181116_070443_5A27000941_release_2.7.7.1 HASH
• CRASH_20181116_074336_5A27000941_release_2.7.7.1 HASH
• CRASH_20181116_113037_5A27000941_release_2.7.7.1 HASH
• CRASH_20181116_113457_5A27000941_release_2.7.7.1 HASH
• CRASH_20181116_122242_5A27000941_release_2.7.7.1 HASH
• CRASH_20181116_134808_5A27000941_release_2.7.7.1 STRING
• CRASH_20181116_134834_5A27000941_release_2.7.7.1 STRING
• CRASH_20181116_134914_5A27000941_release_2.7.7.1 STRING
• CRASH_20181116_134943_5A27000941_release_2.7.7.1 STRING
• CRASH_20181116_135049_5A27000941_release_2.7.7.1 STRING
• CRASH_20181116_135146_5A27000941_release_2.7.7.1 STRING
• CRASH_20181116_135245_5A27000941_release_2.7.7.1 STRING
• CRASH_20181116_135538_5A27000941_release_2.7.7.1 STRING
• CRASH_20181116_135620_5A27000941_release_2.7.7.1 STRING