できれば、このようなnullチェックは書きたくないというのが本音ではないでしょうか。 そこで、Java SE 8で導入されたのがjava.util.Optionalクラスです。 Project Lambdaの最終回となる今回は、このOptionalクラスを紹介していきます。 Optionalクラスとは ...

Null pointer exception is an “exception” (error) that is particularly common when programming in Java. For a beginner, this is a confusing and daunting message to receive, but it can be just ...

ERROR: NullPointerException encountered while trying to adding String to Deque that is set to null. java.lang.NullPointerException INFO: Successful at adding String to Deque that is set to null ...

java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.SharedPreferences android.content.Context.getSharedPreferences (java.lang.String, int)' on a null object reference ...

Currently, in the pure Java space, most current projects approach nullability by treating the null status as extra information to be processed via a build-time checker (static analysis) tool.

All projects (portal, portal-commons, portal-gateway, etc) are java-applications which uses Gradle (with wrapper) as a build tool. All projects have written and compiled in Java 11, uses Gradle 6.1, ...