[JAVA] [jaxrs-jersey] Multiline description strings in the definition of requestBodies leads to invalid @ApiParam Java annotations

Description

Having a multiline string in the definition of a request body leads to a multiline @ApiParam annotation in the generated file which results in compile errors

Swagger-codegen version

3.0.0-rc1

Swagger declaration file content or url

https://berlingroup.stackstorage.com/s/d4KSrRW9bDYmrSg

line 8691 defines the request body "paymentInitiation" with a multiline description:

    paymentInitiation:
      description: |
        JSON request body for a payment inition request message 
        
        There are the following payment-products supported:
          * "sepa-credit-transfers" with JSON-Body
          * "instant-sepa-credit-transfers" with JSON-Body
          * "target-2-payments" with JSON-Body
          * "cross-border-credit-transfers" with JSON-Body
          * "pain.001-sepa-credit-transfers" with XML pain.001.001.03 body for SCT scheme
          * "pain.001-instant-sepa-credit-transfers" with XML pain.001.001.03 body for SCT INST scheme
          * "pain.001-target-2-payments" with pain.001 body. 
            Only country specific schemes are currently available
          * "pain.001-cross-border-credit-transfers" with pain.001 body. 
            Only country specific schemes are currently available
          
        There are the following payment-services supported:
          * "payments"
          * "periodic-payments"
          * "bulk-paments"
        
        All optional, conditional and predefined but not yet used fields are defined.
      required: true

Command line used for generation

java -jar swagger-codegen-cli-3.0.0-rc1.jar generate -l jaxrs-jersey -i psd2-api\ 1.2\ Update\ 2018-08-17.yaml --api-package test --model-package test --library jersey2

Steps to reproduce

Have a look at the generated file src/gen/java/test/V1Api.java. Line 1231 shows the invalid @ApiParam:

public Response initiatePayment(@ApiParam(value = "JSON request body for a payment inition request message 

There are the following payment-products supported:
  * "sepa-credit-transfers" with JSON-Body
  * "instant-sepa-credit-transfers" with JSON-Body
....

Suggest a fix/enhancement

Multiline descriptions work for parameters. See e.g. line 8168 in the yaml file, where a parameter "paymentService" is defined:

    paymentService:
      name: payment-service
      in: path
      description: |
        Payment service:
        
        Possible values are:
        * payments
        * bulk-payments
        * periodic-payments
      required: true

This leads to a totally valid single line @ApiParam definition, see e.g. Line 121 in the generated file V1Api.java.

Please handle multine descriptions for requestBodies exactly as in parameters.

Start with the generated src/gen/java/test/V1Api.java and compare the invalid requestBody @ApiParam near line 1231 with the valid parameter annotation near line 121. Trace the jaxrs-jersey generation path for requestBodies and parameter descriptions. Done means multiline requestBody descriptions produce a single valid Java annotation, with generation output compiling successfully.