The lambda execution is not suspending and the lambda container has no port exposed when running a java 11 lambda with the latest localstack docker image by docker-compose with the environment variable LAMBDA_JAVA_OPTS=-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=_debug_port_
    
It works fine for java8 runtime executions.

Docker command:

> localstack_1  | 2020-01-26T12:42:04:INFO:localstack.services.awslambda.lambda_executors: Running lambda cmd: CONTAINER_ID="$(docker create -i   -e ENV="$ENV" -e DOCKER_LAMBDA_USE_STDIN="$DOCKER_LAMBDA_USE_STDIN" -e HOSTNAME="$HOSTNAME" -e LOCALSTACK_HOSTNAME="$LOCALSTACK_HOSTNAME" -e AWS_LAMBDA_FUNCTION_TIMEOUT="$AWS_LAMBDA_FUNCTION_TIMEOUT" -e AWS_LAMBDA_FUNCTION_NAME="$AWS_LAMBDA_FUNCTION_NAME" -e AWS_LAMBDA_FUNCTION_VERSION="$AWS_LAMBDA_FUNCTION_VERSION" -e AWS_LAMBDA_FUNCTION_INVOKED_ARN="$AWS_LAMBDA_FUNCTION_INVOKED_ARN"  --rm "lambci/lambda:java11" "com.XXX.XXX.Handler")";docker cp "/tmp/localstack/zipfile.0c90736c/." "$CONTAINER_ID:/var/task"; docker start -ai "$CONTAINER_ID";

I think this is due to the fact that the classpath arguments and java opts are only being set if the rutime is equal to LAMBDA_RUNTIME_JAVA8 (line 211 of ocalstack/localstack/services/awslambda/lambda_executors.py , commit 03c6f4bf250edd18eb818ed65090f508636b0bff)
' %s %s'  
                ')";'
                '%s cp "%s/." "$CONTAINER_ID:/var/task"; '
                '%s start -ai "$CONTAINER_ID";'
            ) % (docker_cmd, entrypoint, debug_docker_java_port, env_vars_string, network_str, rm_flag,
                 docker_image, command,
                 docker_cmd, lambda_cwd,
                 docker_cmd)
        else:
            lambda_cwd_on_host = Util.get_host_path_for_path_in_docker(lambda_cwd)
            cmd = (
                '%s run -i'
                ' %s -v "%s":/var/task'
                ' %s'
                ' %s'  
                ' %s'  
                ' %s %s'
            ) % (docker_cmd, entrypoint, lambda_cwd_on_host, env_vars_string,
                 network_str, rm_flag, docker_image, command)
        return cmd
class LambdaExecutorLocal(LambdaExecutor):
    def _execute(self, func_arn, func_details, event, context=None, version=None):
        lambda_cwd = func_details.cwd
        environment = func_details.envvars.copy()
        
        queue = Queue()
        lambda_function = func_details.function(version)
        def do_execute():
            
            if lambda_cwd: