Error message

Deprecated function: implode(): Passing glue string after array is deprecated. Swap the parameters in drupal_get_feeds() (line 394 of /home/virtwww/w_code-sampc3e_56a7b680/http/includes/common.inc).

Checking of presence of a value in nullable types in Java

Integer n1 = 42;
boolean exists1 = n1 != null;
//exists1 is true

Integer n2 = null;
boolean exists2 = n2 != null;
//exists2 is false