r#"impl SwigFrom<jobject> for Box<dyn SomeTrait> {
    fn swig_from(this: jobject, env: *mut JNIEnv) -> Self {
        let mut cb = JavaCallback::new(this, env);
        cb.methods.reserve(1);
        let class = unsafe { (**env).GetObjectClass.unwrap()(env, cb.this) };
        assert!(
            !class.is_null(),
            "GetObjectClass return null class for SomeObserver"
        );
        let method_id: jmethodID = unsafe {
            (**env).GetMethodID.unwrap()(
                env,
                class,
                swig_c_str!("onStateChanged"),
                swig_c_str!("(Ljava/lang/String;)V"),
            )
        };
        assert!(!method_id.is_null(), "Can not find onStateChanged id");
        cb.methods.push(method_id);
        Box::new(cb)
    }
}"#;

r#"impl SomeTrait for JavaCallback {
    #[allow(unused_mut)]
    fn on_state_changed(&self, a0: &str) {
        swig_assert_eq_size!(::std::os::raw::c_uint, u32);
        swig_assert_eq_size!(::std::os::raw::c_int, i32);
        let env = self.get_jni_env();
        if let Some(env) = env.env {
            let mut a0: jstring = from_std_str_jstring(a0, env);
            unsafe {
                (**env).CallVoidMethod.unwrap()(env, self.this, self.methods[0usize], a0);
                if (**env).ExceptionCheck.unwrap()(env) != 0 {
                    log::error!(concat!(
                        stringify!(on_state_changed),
                        ": java throw exception"
                    ));
                    (**env).ExceptionDescribe.unwrap()(env);
                    (**env).ExceptionClear.unwrap()(env);
                }
            };
        }
    }
}"#;