custom validation message in bean validation annotations

Description
[JAVA]
When i try to generate the objects using the below , generate objects does not have message value .
expected:
@JsonProperty("inlineString")
@Nullable
@Size(max=100, message='validation message')
public String getinlineString();

instead getting

@JsonProperty("inlineString")
@Nullable
@Size(max=100)
public String getinlineString();

Test.yaml File
efinitions:
stringPattern:
type: string
minLength: 1
maxLength: 20
pattern: '^([a-zA-Z0-9])*$'
decimalNumber:
type: number
minimum: 0
maximum: 9999999999999.99
multipleOf: 0.01
ApiRequest:
type: object
properties:
stringPattern:
$ref: '#/definitions/stringPattern'
decimalNumber:
$ref: '#/definitions/decimalNumber'
inlineString:
type: string
minLength: 1
maxLength: 20
message :" max number should 20"

Swagger-codegen version

using swagger codegen version 2.4.5

Can you please suggest a way to pull the custom validation message in the yaml file and which in turn generates a object with the same messages.

Start with the Test.yaml example and trace how its validation constraints are converted into Java Bean Validation annotations by the Java generation templates. Check the generated ApiRequest output and determine how a custom message should be represented and preserved; done means the generated @Size annotation includes the requested message.