I have separated the BookInfo class because I wanted to make it public
But there is some issue now in generating dummy BookInfo[] variable
2019-02-10 09:38:14.783 16260-16260/iitd.enigma.libraryportal E/AndroidRuntime: FATAL EXCEPTION: main
Process: iitd.enigma.libraryportal, PID: 16260
java.lang.RuntimeException: Unable to start activity ComponentInfo{iitd.enigma.libraryportal/iitd.enigma.libraryportal.Library_Info_Activity}: java.lang.NullPointerException: Attempt to write to field 'java.lang.String iitd.enigma.libraryportal.BookInfo.issuedTo' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2778)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.NullPointerException: Attempt to write to field 'java.lang.String iitd.enigma.libraryportal.BookInfo.issuedTo' on a null object reference
at iitd.enigma.libraryportal.LibraryMail.generateDummyInfo(LibraryMail.java:114)
at iitd.enigma.libraryportal.Library_Info_Activity.onCreate(Library_Info_Activity.java:34)
at android.app.Activity.performCreate(Activity.java:7009)
at android.app.Activity.performCreate(Activity.java:7000)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
I have separated the BookInfo class because I wanted to make it public But there is some issue now in generating dummy BookInfo[] variable