Attempt to invoke virtual method 'void com.basicprofileapp.dataholder.setUsername(java.lang.String)'on a null object refrence
49
What is a NullPointerException, and how do I fix it?
87728
ArgumentNullException or NullReferenceException from extension method?
131864
Member '' cannot be accessed with an instance reference
10581
Avoiding NullPointerException in Java
73034
StringBuilder append() and null values
80631
NullPointerException but compiling?
137692
NullPointerException when working with arrays
70532
NullReferenceException after POST
128142
java.lang.NullPointerException at org.apache.jsp.foo_jsp._jspInit(foo_jsp.java:22)
128903
ExecuteScalar throws NullReferenceException
24887
java.lang.NullPointerException at javax.faces.webapp.UIComponentClassicTagBase.setJspId
98080
Android: Cannot invoke toString() on the primitive type int
33103
How come invoking a (static) method on a null reference doesn't throw NullPointerException?
23702
Login Loop - "BadValue (integer parameter out of range for operation)" - 16.04
125946
' Exception in Application start method, java.lang.reflect.InvocationTargetException ' while reading and displaying from database
124773
NullPointerException when calling service in onResume
53319
ArgumentException or ArgumentNullException for string parameters?