Convert Box<dyn T> as return type?

[GeekTan]

the trait IntoPyCallbackOutput<_> is not implemented for Vec<Box<dyn java_node::JavaNode>>,how to implemented?

[mejrs]

Usually this means you have to implement IntoPy for that type. If you don't own java_node, you'll need to either convert manually at function boundaries, or use a newtype.

[GeekTan]

I used jni-rs and pyo3, invoke java function in JNI, such as this:
....

#[pymethods]
impl xxxx{
....
 pub fn collect_java_method_usage_data_by_full_name(&self) -> Vec<Box<dyn JavaNode>> {
        let attach_guard = self.jvm.attach_current_thread().unwrap();
        let result: Vec<Box<dyn JavaNode>> = Vec::new();
        let jobj_ptr = attach_guard
            .call_method(
                self.jobj,
                "collectJavaMethodUsageDataByFullName",
                "()V",
                &[],
            )
            .unwrap()
            .to_jni()
            .l;
        let jobj_length = attach_guard.get_array_length(jobj_ptr).unwrap();
        for index in 0..jobj_length {
            let jobj = attach_guard
                .get_object_array_element(jobj_ptr, index)
                .unwrap();
            if attach_guard
                .is_instance_of(jobj, attach_guard.find_class("jadx/api/JavaClass").unwrap())
                .unwrap()
            {
                result.push(Box::new(JavaClass::new(
                    Rc::clone(&self.jvm),
                    jobj.into_inner(),
                )));
            } else if attach_guard
                .is_instance_of(
                    jobj,
                    attach_guard.find_class("jadx/api/JavaMethod").unwrap(),
                )
                .unwrap()
            {
                result.push(Box::new(JavaMethod::new(
                    Rc::clone(&self.jvm),
                    jobj.into_inner(),
                )));
            } else if attach_guard
                .is_instance_of(jobj, attach_guard.find_class("jadx/api/JavaField").unwrap())
                .unwrap()
            {
                result.push(Box::new(JavaField::new(
                    Rc::clone(&self.jvm),
                    jobj.into_inner(),
                )));
            }
        }
        result
    }
....

the JavaNode trait such as :

pub trait JavaNode {
    fn get_name(&self) -> jstring;
    fn get_full_name(&self) -> jstring;
    fn get_decompiled_line(&self) -> jsize;
}

trait JavaNode has JavaClass ,JavaMethod,JavaField impl, but them new function args has a jvm arg send,How i impl them?them(JavaClass,JavaMethod,JavaField struct) every impl IntoPy?

[mejrs]

Well, what would python do what a Box<dyn JavaNode>? You are probably best off wrapping it in a pyclass and making methods that forward to it.