java.lang.NullPointerException

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  • FragmentManager return null
    via Stack Overflow by EricHo
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    • java.lang.NullPointerException: Attempt to invoke virtual method 'android.support.v4.app.FragmentTransaction android.support.v4.app.FragmentTransaction.replace(int, android.support.v4.app.Fragment)' on a null object reference at com.example.h6.personalfinancegidget.BaseFragmentForMonthPlan.getPlanMonthFragment(BaseFragmentForMonthPlan.java:39) at com.example.h6.personalfinancegidget.MonthlyPlanActivity$1.onPageSelected(MonthlyPlanActivity.java:68) at android.support.v4.view.ViewPager.dispatchOnPageSelected(ViewPager.java:1939) at android.support.v4.view.ViewPager.scrollToItem(ViewPager.java:687) at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:671) at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:632) at android.support.v4.view.ViewPager.setCurrentItem(ViewPager.java:613) at com.example.h6.personalfinancegidget.MonthlyPlanActivity$2.onTabSelected(MonthlyPlanActivity.java:82) at android.support.design.widget.TabLayout.dispatchTabSelected(TabLayout.java:1149) at android.support.design.widget.TabLayout.selectTab(TabLayout.java:1142) at android.support.design.widget.TabLayout.selectTab(TabLayout.java:1112) at android.support.design.widget.TabLayout$Tab.select(TabLayout.java:1407) at android.support.design.widget.TabLayout$TabView.performClick(TabLayout.java:1511) at android.view.View$PerformClick.run(View.java:19866) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5254) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
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