[JAVA] VM arguments -DapiPackage, -DmodelPackage, -DinvokerPackage not working

Description

When generating Java client VM arguments -DapiPackage, -DmodelPackage, -DinvokerPackage are not working (or I'm not doing it right).

Swagger-codegen version

jar built from master

Swagger declaration file content or url

http://petstore.swagger.io/v2/swagger.json

Command line used for generation / Steps to reproduce

git clone https://github.com/swagger-api/swagger-codegen
cd swagger-codegen
mvn clean package
cd ..

java -DinvokerPackage="com.mycompany.foo" \
    -DmodelPackage="com.mycompany.foo.model" \
    -DapiPackage="com.mycompany.foo.api" \
    -jar swagger-codegen/modules/swagger-codegen-cli/target/swagger-codegen-cli.jar generate \
    -i http://petstore.swagger.io/v2/swagger.json \
    -l java \
    -o testing_vm_args \
    >codegen_out 2>&1

Output

gist. Note that all packages are the default /io/swagger/

Reproduce the issue with the Java generation command shown in the report and the petstore Swagger definition. Start by tracing how -DapiPackage, -DmodelPackage, and -DinvokerPackage are read during Java client generation, then compare the generated output with the requested package names. Done means the generated client uses the three supplied package values instead of the default io.swagger packages.