\#2195 add enum value getter for spring generator

Author: bilak

modules/openapi-generator/src/main/resources/JavaSpring/enumClass.mustache

@@ -26,13 +26,21 @@
       this.value = value;
     }
 
-    @Override
+    {{#jackson}}
     @JsonValue
+    {{/jackson}}
+    public {{{dataType}}} getValue() {
+      return value;
+    }
+
+    @Override
     public String toString() {
       return String.valueOf(value);
     }
 
+    {{#jackson}}
     @JsonCreator
+    {{/jackson}}
     public static {{#datatypeWithEnum}}{{{.}}}{{/datatypeWithEnum}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} fromValue(String text) {
       for ({{#datatypeWithEnum}}{{{.}}}{{/datatypeWithEnum}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} b : {{#datatypeWithEnum}}{{{.}}}{{/datatypeWithEnum}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}}.values()) {
         if (String.valueOf(b.value).equals(text)) {

modules/openapi-generator/src/main/resources/JavaSpring/enumOuterClass.mustache

@@ -1,5 +1,6 @@
 {{#jackson}}
 import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonValue;
 {{/jackson}}
 
 /**
@@ -24,13 +25,21 @@ public enum {{#datatypeWithEnum}}{{{.}}}{{/datatypeWithEnum}}{{^datatypeWithEnum
     this.value = value;
   }
 
-  @Override
+  {{#jackson}}
   @JsonValue
+  {{/jackson}}
+  public {{{dataType}}} getValue() {
+    return value;
+  }
+
+  @Override
   public String toString() {
     return String.valueOf(value);
   }
 
+  {{#jackson}}
   @JsonCreator
+  {{/jackson}}
   public static {{#datatypeWithEnum}}{{{.}}}{{/datatypeWithEnum}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} fromValue(String text) {
     for ({{#datatypeWithEnum}}{{{.}}}{{/datatypeWithEnum}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} b : {{#datatypeWithEnum}}{{{.}}}{{/datatypeWithEnum}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}}.values()) {
       if (String.valueOf(b.value).equals(text)) {