Polish JSON class scope

Use package scope when possible

Issue gh-3736

core/src/main/java/org/springframework/security/jackson2/AnonymousAuthenticationTokenMixin.java

@@ -42,7 +42,7 @@ import java.util.Collection;
 @JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.ANY, isGetterVisibility = JsonAutoDetect.Visibility.NONE,
 		getterVisibility = JsonAutoDetect.Visibility.NONE, creatorVisibility = JsonAutoDetect.Visibility.ANY)
 @JsonIgnoreProperties(ignoreUnknown = true)
-public class AnonymousAuthenticationTokenMixin {
+class AnonymousAuthenticationTokenMixin {
 
 	/**
 	 * Constructor used by Jackson to create object of {@link org.springframework.security.authentication.AnonymousAuthenticationToken}.

core/src/main/java/org/springframework/security/jackson2/RememberMeAuthenticationTokenMixin.java

@@ -48,7 +48,7 @@ import java.util.Collection;
 @JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.ANY, getterVisibility = JsonAutoDetect.Visibility.NONE,
 		isGetterVisibility = JsonAutoDetect.Visibility.NONE, creatorVisibility = JsonAutoDetect.Visibility.ANY)
 @JsonIgnoreProperties(ignoreUnknown = true)
-public class RememberMeAuthenticationTokenMixin {
+class RememberMeAuthenticationTokenMixin {
 
 	/**
 	 * Constructor used by Jackson to create

core/src/main/java/org/springframework/security/jackson2/UnmodifiableSetMixin.java

@@ -36,7 +36,7 @@ import java.util.Set;
  * @since 4.2
  */
 @JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, include = JsonTypeInfo.As.PROPERTY)
-public class UnmodifiableSetMixin {
+class UnmodifiableSetMixin {
 
 	/**
 	 * Mixin Constructor

core/src/main/java/org/springframework/security/jackson2/UserDeserializer.java

@@ -39,7 +39,7 @@ import java.util.Set;
  * @see UserMixin
  * @since 4.2
  */
-public class UserDeserializer extends JsonDeserializer<User> {
+class UserDeserializer extends JsonDeserializer<User> {
 
 	/**
 	 * This method will create {@link User} object. It will ensure successful object creation even if password key is null in

core/src/main/java/org/springframework/security/jackson2/UserMixin.java

@@ -45,5 +45,5 @@ import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 @JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.ANY, getterVisibility = JsonAutoDetect.Visibility.NONE,
 		isGetterVisibility = JsonAutoDetect.Visibility.NONE)
 @JsonIgnoreProperties(ignoreUnknown = true)
-public abstract class UserMixin {
+abstract class UserMixin {
 }

core/src/main/java/org/springframework/security/jackson2/UsernamePasswordAuthenticationTokenDeserializer.java

@@ -43,7 +43,7 @@ import java.util.List;
  * @see UsernamePasswordAuthenticationTokenMixin
  * @since 4.2
  */
-public class UsernamePasswordAuthenticationTokenDeserializer extends JsonDeserializer<UsernamePasswordAuthenticationToken> {
+class UsernamePasswordAuthenticationTokenDeserializer extends JsonDeserializer<UsernamePasswordAuthenticationToken> {
 
 	/**
 	 * This method construct {@link UsernamePasswordAuthenticationToken} object from serialized json.

core/src/main/java/org/springframework/security/jackson2/UsernamePasswordAuthenticationTokenMixin.java

@@ -44,5 +44,5 @@ import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 @JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.ANY, getterVisibility = JsonAutoDetect.Visibility.NONE,
 		isGetterVisibility = JsonAutoDetect.Visibility.NONE)
 @JsonDeserialize(using = UsernamePasswordAuthenticationTokenDeserializer.class)
-public abstract class UsernamePasswordAuthenticationTokenMixin {
+abstract class UsernamePasswordAuthenticationTokenMixin {
 }