Add JAVA_OPTS to swagger-generator scripts

We would like to pass some options to the java executor to reduce logging output:

export JAVA_OPTS="${JAVA_OPTS} -Dlog.level=warn --illegal-access=warn"

In the OpenApi generator for example this is done by setting JAVA_OPTS and then calling the script:

> cat $(which openapi-generator)
#!/bin/bash
exec "/usr/local/opt/openjdk/bin/java" $JAVA_OPTS -jar "/usr/local/Cellar/openapi-generator/4.2.3_1/libexec/openapi-generator-cli.jar" "$@"

In swagger-codegen those JAVA_OPTS are ignored:

> cat $(which swagger-codegen)
#!/bin/bash
exec java -jar /usr/local/Cellar/swagger-codegen/3.0.18/libexec/swagger-codegen-cli.jar "$@"

Seems to work when I modify the script and add the options:

/> cat $(which swagger-codegen)
#!/bin/bash
exec java $JAVA_OPTS -jar /usr/local/Cellar/swagger-codegen/3.0.18/libexec/swagger-codegen-cli.jar "$@"

macOS, homebrew, swagger-codegen version 3.0.18

I don't see any discussion about the issue, would it be okay to just add the parameter?

Start by locating the swagger-codegen launcher script or packaging entry point that produces the wrapper shown in the issue, then compare it with the openapi-generator wrapper. Verify that the resulting command passes JAVA_OPTS before the JAR and that existing command-line arguments still work.