I was trying to create an Android system service with C++ and make it callable from Java clients. So far the C++ servcie is up and running, but I don’t see AOSP generated Java files from the AIDL file. I am attaching the AIDL file and Android.bp below. Did I miss something in the Android.bp? Java backend is already enabled.
Where is the location of the Java files generated from AIDL? Thanks!

AIDL:

package helloworld.service;

@VintfStability
interface IHelloworldService {
    int getNumber ();
}

Android.bp

cc_binary {
    name: "helloworld_service",
    srcs: ["src/**/*.cpp"],
    device_specific: true,
    init_rc: ["helloworld_service.rc"],
    shared_libs: [
        "liblog",
        "libutils",
        "libbase",
        "libbinder_ndk",
        "helloworld.service-V2-ndk",
    ],
    vintf_fragments: ["hs_vintf_frag.xml"],
}

aidl_interface {
    name: "helloworld.service.api",
    vendor_available: true,
    srcs: ["interfaces/**/*.aidl"],
    local_include_dir: "interfaces",

    stability: "vintf",
    backend: {
        java: {
            enabled: true,
            platform_apis: true,
        },
        cpp: {
            enabled: true,
        },
        ndk: {
            enabled: true,
        },
    },
    versions_with_info: [
        {
            version: "2",
            imports: [],
        },

    ],
}
}