Why is my app crashing with `NumberFormatException`?

Question

My app is crashing on click admission layout but it's not crashing with all login credential only with some ID it's crashing. It completely depends on login account. I have 100s of account and I tried login with all different credential only it's crashing with few login accounts.

Here are the logs:

 LIST_ADMISSION: [ListEnquiryItem{paid_fees = '',fname = '',course_id = '5',address = 'thank you for',discount_fees = '',course_name = '11th',batch_id = '4',subject = 'Science,Hindi,English',total_fees = '10000',mobile = '9999999999',photo = 'http://webytechno.com/ClassBro/admin/uploads/1536226227055.jpg',medium = '',date1 = '2018-09-06',fmobile = '',reference = '',password = 'g3gkba',batch_name = 'Evening's Batch',remaining_fees = '10000',school = '',sname = 'adil',dob = '2018-09-06',id = '402',email = '',username = 'adilfrn'}, ListEnquiryItem{paid_fees = '9000',fname = 'Kasim mulla',course_id = '30',address = 'jdv jabs jdbbs',discount_fees = '500',course_name = 'tybms',batch_id = '36',subject = 'sub1,sub2,sub3',total_fees = '12000',mobile = '7414969600',photo = 'http://webytechno.com/ClassBro/admin/uploads/1526708605633.jpg',medium = 'English',date1 = '2018-05-19',fmobile = '8355893913',reference = 'Imram',password = 'jy8g6t',batch_name = 'tybms morning',remaining_fees = '2500',school = 'vvuc',sname = 'Daud',dob = '2018-05-19',id = '57',email = 'daud@gmail.con',username = 'pmd17t'}, ListEnquiryItem{paid_fees = '1000',fname = 'cyz',course_id = '1',address = 'gaahha',discount_fees = '500',course_name = '10th class',batch_id = '2',subject = 'English,Hindi,Gujarati,Science',total_fees = '25000',mobile = '9875461312',photo = 'http://webytechno.com/ClassBro/admin/uploads/1525085910070.jpg',medium = 'eng',date1 = '2018-04-30',fmobile = '0784945431',reference = 'friend',password = 'azv3r2',batch_name = 'CBSE',remaining_fees = '23500',school = 'abc',sname = 'dev',dob = '2018-04-30',id = '9',email = 'd@gmail.com',username = 'lgr6vb'}, ListEnquiryItem{paid_fees = '1000',fname = 'snsnsns',course_id = '1',address = 'adajan',discount_fees = '500',course_name = '10th class',batch_id = '2',subject = 'English,Hindi,Gujarati,Science',total_fees = '25000',mobile = '4799497979',photo = 'http://webytechno.com/ClassBro/admin/uploads/1525418210297.jpg',medium = 'xyz',date1 = '2018-05-04',fmobile = '4949494994',reference = 'friend',password = 'dij0n0',batch_name = 'CBSE',remaining_fees = '23500',school = 'abc',sname = 'dev',dob = '2018-04-30',id = '20',email = 'd@gmail.com',username = '6wrecl'}, ListEnquiryItem{paid_fees = '16000',fname = 'Tank',course_id = '1',address = 'adajan',discount_fees = '500',course_name = '10th class',batch_id = '2',subject = 'Hindi,Gujarati,Science',total_fees = '25000',mobile = '9601582889',photo = 'http://webytechno.com/ClassBro/admin/uploads/1525426112538.jpg',medium = 'eng',date1 = '2018-05-04',fmobile = '9608546322',reference = 'friend',password = '3rxeqd',batch_name = 'CBSE',remaining_fees = '8500',school = 'abc',sname = 'Devilal',dob = '2018-03-07',id = '28',email = 'devil@gmail.com',username = 'r3f7t0'}, ListEnquiryItem{paid_fees = '1000',fname = 'Deepak',course_id = '1',address = 'borivali',discount_fees = '0',course_name = '10th class',batch_id = '5',subject = 'English,Hindi,Gujarati,Maths',total_fees = '5000',mobile = '9619073803',photo = 'http://webytechno.com/ClassBro/admin/uploads/54350-koala.jpg',medium = 'English',date1 = '2018-04-26',fmobile = '7021327803',reference = 'friend',password = '1234',batch_name = 'night batches',remaining_fees = '4000',school = 'J.B.Khot High School',sname = 'Dhaval',dob = '2018-04-25',id = '3',email = 'dhavalvyas08@gm',username = 'dhaval'}, ListEnquiryItem{paid_fees = '1000',fname = 'cyz',course_id = '1',address = 'gaahha',discount_fees = '5000',course_name = '10th class',batch_id = '4',subject = 'Hindi,Gujarati,Science',total_fees = '25000',mobile = '9875461312',photo = 'http://webytechno.com/ClassBro/admin/uploads/1525418584333.jpg',medium = 'sjsns',date1 = '2018-05-04',fmobile = '0784945431',reference = 'friend',password = 'lkq4rx',batch_name = 'Evening's Batch',remaining_fees = '19000',school = 'BBka',sname = 'Dhaval',dob = '2018-04-30',id = '21',email = 'd@gmail.com',username = 'tukw2o'}, ListEnquiryItem{paid_fees = '500',fname = 'kale',course_id = '27',address = 'malad',discount_fees = '500',course_name = 'H S C',batch_i
 FATAL EXCEPTION: main
    Process: com.classbro.student.admin, PID: 9292
    java.lang.NumberFormatException: For input string: ""
        at java.lang.Integer.parseInt(Integer.java:620)
        at java.lang.Integer.parseInt(Integer.java:643)
        at app.student.com.studentmanagement.adapter.AdmissionListAdapter.onBindViewHolder(AdmissionListAdapter.java:56)
        at app.student.com.studentmanagement.adapter.AdmissionListAdapter.onBindViewHolder(AdmissionListAdapter.java:22)
        at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:6673)
        at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:6714)
        at android.support.v7.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:5647)
        at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5913)
        at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5752)
        at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5748)
        at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2232)
        at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1559)
        at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1519)
        at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:614)
        at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3812)
        at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3529)
        at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:4082)
        at android.view.View.layout(View.java:19590)
        at android.view.ViewGroup.layout(ViewGroup.java:6053)
        at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1080)
        at android.view.View.layout(View.java:19590)
        at android.view.ViewGroup.layout(ViewGroup.java:6053)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1544)
        at android.view.View.layout(View.java:19590)
        at android.view.ViewGroup.layout(ViewGroup.java:6053)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.view.View.layout(View.java:19590)
        at android.view.ViewGroup.layout(ViewGroup.java:6053)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1544)
        at android.view.View.layout(View.java:19590)
        at android.view.ViewGroup.layout(ViewGroup.java:6053)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.view.View.layout(View.java:19590)
        at android.view.ViewGroup.layout(ViewGroup.java:6053)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1544)
        at android.view.View.layout(View.java:19590)
        at android.view.ViewGroup.layout(ViewGroup.java:6053)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at com.android.internal.policy.DecorView.onLayout(DecorView.java:758)
        at android.view.View.layout(View.java:19590)
        at android.view.ViewGroup.layout(ViewGroup.java:6053)
        at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2484)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2200)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1386)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6733)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911)
     at android.view.Choreographer.doCallbacks(Choreographer.java:723)
        at android.view.Choreographer.doFrame(Choreographer.java:658)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897)
        at android.os.Handler.handleCallback(Handler.java:789)
        at android.os.Handler.dispatchMessage(Handler.java:98)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6541)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

`java.lang.NumberFormatException: For input string: ""` This mean your input string is empty, and an empty string is not a valid number — Ferrybig, Sep 12 '18 at 08:24
@Ferrybig Thanks for help but with other account it's working perfectly — A.Gun, Sep 12 '18 at 08:26
in some cases you are trying to parse empty string into int, obviously. Which means that there is a problem with your code. `AdmissionListAdapter.java:56` — Vladyslav Matviienko, Sep 12 '18 at 08:27

score 1 · Accepted Answer · answered Sep 12 '18 at 08:24

1

You got a java.lang.NumberFormatException.

This happens, because you have called Integer.parseInt with an empty String.

Since this happens only with a few accounts i assume that their password is empty and you try to login sending an empty password, which would be ok if you accepted String the password as the Strings as they are sent instead of trying to convert them to Integer.

answered Sep 12 '18 at 08:24

Absent

884
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Can you tell what i need to do because it's only crashing with few account. – A.Gun Sep 12 '18 at 08:28
@A.Gun Either you force every ID/password/etc what you are using in parseInt to be a non-empty, numerical String or you get rid of parseInt and check for String equality instead – Absent Sep 12 '18 at 08:30
thanks man you solved my problem – A.Gun Sep 12 '18 at 09:33

score 0 · Answer 2 · edited Sep 12 '18 at 08:27

0

You are using parseInt() method and pass String variables to it. If your IDs are String, use a String variable for that.

edited Sep 12 '18 at 08:27

ʍѳђઽ૯ท

16,646
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answered Sep 12 '18 at 08:27

Matin Gdz

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Ok will check and let you know – A.Gun Sep 12 '18 at 08:31

Why is my app crashing with `NumberFormatException`?

2 Answers2