Add "equals" and "hashCode" methods to Java servers

for "jaxrs" and "spring-mvc"

modules/swagger-codegen/src/main/resources/JavaSpringMVC/model.mustache

@@ -5,6 +5,8 @@ package {{package}};
 
 import io.swagger.annotations.*;
 import com.fasterxml.jackson.annotation.JsonProperty;
+
+import java.util.Objects;
 {{#models}}
 
 {{#model}}{{#description}}
@@ -38,6 +40,25 @@ public class {{classname}} {{#parent}}extends {{{parent}}}{{/parent}} {
 
   {{/vars}}
 
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    {{classname}} {{classVarName}} = ({{classname}}) o;{{#hasVars}}
+    return {{#vars}}Objects.equals({{name}}, {{classVarName}}.{{name}}){{#hasMore}} &&
+        {{/hasMore}}{{^hasMore}};{{/hasMore}}{{/vars}}{{/hasVars}}{{^hasVars}}
+    return true;{{/hasVars}}
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash({{#vars}}{{name}}{{#hasMore}}, {{/hasMore}}{{/vars}});
+  }
+
   @Override
   public String toString()  {
     StringBuilder sb = new StringBuilder();