Everything is nonnull

Description

Extends the reach of non-null to everything ever.

Additions

• A new Annotation applying @Nonnull to packages, fields, local variables, methods, parameters, and field usage

Changes

• Applied the much more strict annotation to all packages
• What can be null, is nullable
• Removed everything Report as it was causing errors and it was too much effort to fix
• Fixed some logic in places where initalization was not detected properly by SpotBugs
• Fixed some hashmap not being an enum map that was causing problems for reasons unknown
• Upgraded to the brand-spanking-new Spotbugs plugin v2
• Accidentally hit reformat in some classes, can't be arsed to fix it so deal with it

Test and Review

To be filled in by the reviewers

• All of the methods are commented to expectation

• The methods are tested to satisfaction

• There are no unnecessary files present in the MR

• The continuous integration has no problems with the MR

• The MR is filled in as requested (including labels, milestones, and reviewers)

• The documentation is up-to-date

• All nullable parameters are marked as such

core/src/main/java/nl/tudelft/ewi/auta/core/authentication/AuthenticationToken.java

@@ -3,6 +3,8 @@ package nl.tudelft.ewi.auta.core.authentication;
 import org.springframework.security.authentication.AbstractAuthenticationToken;
 import org.springframework.security.core.userdetails.UserDetails;
 
+import javax.annotation.Nullable;
+
 /**
  * An authentication token.
  */
@@ -11,6 +13,7 @@ public class AuthenticationToken extends AbstractAuthenticationToken {
     /**
      * The token.
      */
+    @Nullable
     private String token;
 
     /**
@@ -50,6 +53,7 @@ public class AuthenticationToken extends AbstractAuthenticationToken {
      * @return the token
      */
     @Override
+    @Nullable
     public Object getCredentials() {
         return this.token;
     }