ERROR - "Lambda expression's signature does not match the signature of the functional interface method get()" while using Supplier and Lambda Expressions in Java 8

Error

Lambda expression's signature does not match the signature of the functional interface method get()

while using Supplier and Lambda Expressions in Java 8.

Error Type

Compile Time ( Java 8 )

Sample Code

Supplier spr = p->p;

Cause

Supplier represent a function that accepts no argument and produces result of any type. We shouldn't specify the anonymous argument p here.

Resolution

Specify the Supplier correctly. 

Supplier spr = HelloJava8::New;