java - How to read Android crash log? -

java - How to read Android crash log? -

i have published first android app on google play store few days ago. crash log available in developer console , trying find out caused crash. although un-obfuscated stack trace have difficulties understand crash log:

java.lang.runtimeexception: unable start activity componentinfo{com.example.myapp/com.example.myapp.ui.addresseditor.addresseditoractivity}: java.lang.nullpointerexception @ android.app.activitythread.performlaunchactivity(activitythread.java:2184) @ android.app.activitythread.handlelaunchactivity(activitythread.java:2233) @ android.app.activitythread.access$800(activitythread.java:135) @ android.app.activitythread$h.handlemessage(activitythread.java:1196) @ android.os.handler.dispatchmessage(handler.java:102) @ android.os.looper.loop(looper.java:136) @ android.app.activitythread.main(activitythread.java:5001) @ java.lang.reflect.method.invokenative(native method) @ java.lang.reflect.method.invoke(method.java:515) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:785) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:601) @ dalvik.system.nativestart.main(native method) caused by: java.lang.nullpointerexception @ com.example.myapp.ui.addresseditor.addresseditoractivity.void setentrystart(java.util.date)(unknown source) void setcategory(com.example.myapp.common.model.bookingdetail) void loadviewmodel(android.os.bundle) void putaddresdetailuuid(java.lang.string,com.example.myapp.common.model.addressdetail,android.os.bundle) void putdate(java.lang.string,java.util.date,android.os.bundle) void dosave(com.example.myapp.ui.addresseditor.addresseditoractivity$oneditortaskcompletelistener) void saverecurringtemplate(boolean,boolean,boolean,com.example.myapp.ui.addresseditor.addresseditoractivity$oneditortaskcompletelistener) void closeeditor(boolean,boolean,boolean) void access$0(com.example.myapp.ui.addresseditor.addresseditoractivity) void access$5(com.example.myapp.ui.addresseditor.addresseditoractivity,java.lang.string) void access$6(com.example.myapp.ui.addresseditor.addresseditoractivity,android.view.view) void access$7(com.example.myapp.ui.addresseditor.addresseditoractivity,java.util.date) void access$11(com.example.myapp.ui.addresseditor.addresseditoractivity,com.example.myapp.common.model.enums.priorities) void access$13(com.example.myapp.ui.addresseditor.addresseditoractivity,com.example.myapp.common.model.addressdetail) void access$25(com.example.myapp.ui.addresseditor.addresseditoractivity,double) void access$27(com.example.myapp.ui.addresseditor.addresseditoractivity,boolean) void access$28(com.example.myapp.ui.addresseditor.addresseditoractivity,boolean,boolean,boolean) void access$36(com.example.myapp.ui.addresseditor.addresseditoractivity,boolean,boolean,boolean,com.example.myapp.ui.addresseditor.addresseditoractivity$oneditortaskcompletelistener) @ com.example.myapp.ui.addresseditor.addresseditoractivity.void oncreate(android.os.bundle)(unknown source) @ android.app.activity.performcreate(activity.java:5231) @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1087) @ android.app.activitythread.performlaunchactivity(activitythread.java:2148) ... 11 more

obviously crash caused nullpointerexception how find exact source? have read stack trace top-down or bottom-up? far think trace has 2 parts:

'dalvik.system.nativestart.main(native method)' first element in stack. staring here other methodes in stack, android.app.activitythread.performlaunchactivity have been called.

right?

while app executing android.app.activitythread.performlaunchactivity nullpointerexception occurred. exact location of exception specified in sec part of log starting @ bottom line.

the first methode of own code com.example.myapp.ui.addresseditor.addresseditoractivity.void oncreate called right?

the next lines not understand: methodes listed here, void setentrystart or void setcategory of cause part of addresseditoractivity not called straight oncreate.

is list of methodes of addresseditoractivity have been used @ any time during lifetime of activity or mean, these methodes called each other? setentrystart not phone call setcategory or vice versa...

do have read method list top-down or bottom up? starting setentrystart makes sense follow list downwards closeeditor (start activity, setup properties , view model, edit data, save data, close editor) access$xy entries mean? not create sense me.

do have possible cause of nullpointerexception in setentrystart or in access$36(...) (what be) or @ completly different location?

thank much help!

edit: @shayan pourvatan, @pankaj

this code of setentrystart

private date _entrystart; private void setentrystart(date start) { _entrystart = start; if (_entryend != null && _entrystart != null && _entryend.before(_entrystart)) _entryend = _entrystart; } private date _entryend; private void setentryend(date end) { _entryend = end; if (_entryend != null && _entrystart != null && _entryend.before(_entrystart)) _recurringstart = _entryend; }

the possibility nullpointerexception _entryend.before(_entrystart) _entryend beingness null, wouldn't it? if _entryend != null checked before , far know farther evaluation of if-statment canceld if status fails. _entryend.before(_entrystart) not called if _entryend null, it?

these stack traces , method called stack , stack lifo (last in first out)

so, have read top bottom.

eg: if phone call m1() main() ,m2() m1() , m3() m2() stack be

main()->m1()->m2()->m3()

java android eclipse nullpointerexception crash-dumps