[java/resttemplate] BUG jsr250-api not included in maven pom.xml

Description

The code generated by the java/resttemplate module does not include jsr250-api in pom.xml -- but it is included in build.gradle.

Swagger-codegen version

2.4.1

Swagger declaration file content or url

https://raw.githubusercontent.com/OAI/OpenAPI-Specification/master/examples/v2.0/yaml/petstore.yaml

Command line used for generation

java -jar swagger-codegen-cli.jar generate  \
     -i https://raw.githubusercontent.com/OAI/OpenAPI-Specification/master/examples/v2.0/yaml/petstore.yaml \
     -l java \
     -c spring.json \
     -o patient-detail-client

contents of spring.json

{
  "modelPackage" : "com.example.model",
  "apiPackage"   : "com.example.api",
  "invokerPackage" : "com.example.invoker",
  "groupId" : "com.example",
  "artifactId"  : "its-a-bug",
  "fullJavaUtil" : true,
  "dateLibrary" : "java8",
  "library" :  "resttemplate"
}   

Steps to reproduce

1. Create a java/resttemplate project.
2. Inspect the pom.xml
3. Notice the missing dependency.

Related issues/PRs

Suggest a fix/enhancement

Generate a java/resttemplate project with the petstore specification and the shown command, then inspect its pom.xml and compare it with build.gradle. Confirm that jsr250-api is present in the Gradle dependencies but absent from the Maven output; done means the generated pom.xml includes the dependency.