# Help passing a saved session variable to a Java method **URL:** \ **Category:** Gatling (Open-Source)\ **Created:** [November 9, 2023, 3:13pm UTC](https://community.gatling.io/t/help-passing-a-saved-session-variable-to-a-java-method/8433 "2023-11-09T15:13:32Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![gkandale](https://avatars.discourse-cdn.com/v4/letter/g/c2a13f/32.png) [@gkandale](https://community.gatling.io/u/gkandale)\ **Post date:** [November 9, 2023, 3:13pm UTC](https://community.gatling.io/t/help-passing-a-saved-session-variable-to-a-java-method/8433/1 "2023-11-09T15:13:32Z")
Hi all, I’m having a hard time passing a variable from my GET call to my DELETE call for some reason. I’ve done this a million times but in this case it does not work for me. Any help would be appreciated!! 😃 ```auto public static final ChainBuilder getListOfStuff = exec(http("Get List of Stuff") .get("/example/api/v1/stuffs") .headers(getSessionHeaders()) .check(status().is(200)) .check(jsonPath("$..id").exists().saveAs("stuffsId")) ); public static final ChainBuilder deleteStuffIfCurrentUserIsOwnerOfStuff; static { try { deleteStuffIfCurrentUserIsOwnerOfStuff = exec(http("Delete Stuff If Current User Is Owner") .delete("/example/api/v1/stuffs") .headers(getStuffSessionHeaders("#{stuffsId}")) .check(status().is(204)) ); } catch (IOException e) { throw new RuntimeException(e); } } public static Map getStuffSessionHeaders(String stuffsId) throws IOException { System.out.println("stuffsId=========" + stuffsId); ................... } ``` The result I get from trying to pass **#{stuffsId}** to a java method is “stuffId=========#{stuffsId}” instead of the actual stuff ID i’m saving in GET from previous call. Any help would be appreciated! Thanks ---
**Author:** ![sbrevet](https://dub1.discourse-cdn.com/flex013/user_avatar/community.gatling.io/sbrevet/32/830_2.png) [@sbrevet](https://community.gatling.io/u/sbrevet)\ **Post date:** [November 9, 2023, 3:17pm UTC](https://community.gatling.io/t/help-passing-a-saved-session-variable-to-a-java-method/8433/2 "2023-11-09T15:17:50Z")
Hi @gkandale, Your issue lie in the fact that `headers` take a `Map` as parameter and doesn’t involve Gatling Expression Language. For the particular header you want with value from session (by expression language, for instance), you should use the `header` (singular) method. Hope that helps, Cheers! ---
**Author:** ![gkandale](https://avatars.discourse-cdn.com/v4/letter/g/c2a13f/32.png) [@gkandale](https://community.gatling.io/u/gkandale)\ **Post date:** [November 9, 2023, 3:26pm UTC](https://community.gatling.io/t/help-passing-a-saved-session-variable-to-a-java-method/8433/3 "2023-11-09T15:26:46Z")
Hey thank you Sébastien for your super fast response! Thats awesome!! Can you give me an example? I don’t completely understand ☹ Thanks again!! George ---
**Author:** ![sbrevet](https://dub1.discourse-cdn.com/flex013/user_avatar/community.gatling.io/sbrevet/32/830_2.png) [@sbrevet](https://community.gatling.io/u/sbrevet)\ **Post date:** [November 9, 2023, 3:33pm UTC](https://community.gatling.io/t/help-passing-a-saved-session-variable-to-a-java-method/8433/4 "2023-11-09T15:33:06Z")
This scenario will sent the value `#{hello}` without replacing it in the header. ```java exec(session -> session.set("hello", "world")) .exec(http("Get List of Stuff") .get("/api/endpoint") .headers(Map.of("X-Hello", "#{hello}")) ); ``` But the following one will set the `X-Hello` header to the right value: ```java exec(session -> session.set("hello", "world")) .exec(http("Get List of Stuff") .get("/api/endpoint") .header("X-Hello", "#{hello}") ); ``` Does that help? Cheers! ---
**Author:** ![gkandale](https://avatars.discourse-cdn.com/v4/letter/g/c2a13f/32.png) [@gkandale](https://community.gatling.io/u/gkandale)\ **Post date:** [November 9, 2023, 3:45pm UTC](https://community.gatling.io/t/help-passing-a-saved-session-variable-to-a-java-method/8433/5 "2023-11-09T15:45:51Z")
Hey Sebastian, I’m trying to pass a variable to a method call which builds out the headers, including calculating the bearer token, but the stuff ID i’m passing to the method does not send the value, it sends “#{stuffId}” as the actual string ```auto public static final ChainBuilder deleteStuffIfCurrentUserIsOwnerOfStuff; static { try { deleteStuffIfCurrentUserIsOwnerOfStuff = exec(http("Delete Stuff If Current User Is Owner") .delete("/example/api/v1/stuffs") .headers(getStuffSessionHeaders("#{stuffsId}")) .check(status().is(204)) ); } catch (IOException e) { throw new RuntimeException(e); } } public static Map getStuffSessionHeaders(String stuffsId) throws IOException { System.out.println("stuffsId=========" + stuffsId); STUFF_HELPER = new STUFFHelper(context); String stuffAccessToken = STUFF_HELPER.getSwitchStuffToken(stuffsId, getUserTokens()); Map stuffsSessionHeaders = new HashMap(); stuffsSessionHeaders.put("content-Type", "application/json"); stuffsIdSessionHeaders.put("accept", "application/json"); stuffsIdSessionHeaders.put("authorization", "Bearer " + accountAccessToken); return accountSessionHeaders; } ``` ---
**Author:** ![sbrevet](https://dub1.discourse-cdn.com/flex013/user_avatar/community.gatling.io/sbrevet/32/830_2.png) [@sbrevet](https://community.gatling.io/u/sbrevet)\ **Post date:** [November 9, 2023, 3:51pm UTC](https://community.gatling.io/t/help-passing-a-saved-session-variable-to-a-java-method/8433/6 "2023-11-09T15:51:25Z")
As stated in the first alert box of the [Concepts](https://gatling.io/docs/gatling/reference/current/core/concepts/#dsl) page: > The components of this DSL are mere **definitions** of the desired effect. They don’t generate the desired effect where you invoke them in your own code. Only when chained with other components so they are ultimately passed to the [setUp](https://gatling.io/docs/gatling/reference/current/core/simulation/#setup), can the Gatling engine interpret them and produce the desired effect. So, the call to your `getStuffSessionHeaders` is executed during the initialization phase. Way before the first virtual user is created. Cheers! ---
**Author:** ![gkandale](https://avatars.discourse-cdn.com/v4/letter/g/c2a13f/32.png) [@gkandale](https://community.gatling.io/u/gkandale)\ **Post date:** [November 9, 2023, 4:00pm UTC](https://community.gatling.io/t/help-passing-a-saved-session-variable-to-a-java-method/8433/7 "2023-11-09T16:00:37Z")
I’m trying to change tokens mid test - user needs a space specific token after they sign up to become an owner of some space. I need to get a new token for the user to be able to work within their specific space (including deleting their space after they are done with it. Any thought on how I can do this within gatling? ---
**Author:** ![gkandale](https://avatars.discourse-cdn.com/v4/letter/g/c2a13f/32.png) [@gkandale](https://community.gatling.io/u/gkandale)\ **Post date:** [November 10, 2023, 2:40pm UTC](https://community.gatling.io/t/help-passing-a-saved-session-variable-to-a-java-method/8433/8 "2023-11-10T14:40:14Z")
Figured it out…wrote a gatling component instead of reusing the automation code that I’m trying to integrate with ☹ ---
**Author:** ![system](https://europe1.discourse-cdn.com/flex013/uploads/gatling2/original/2X/b/b148e0742de35c6280726cabf3ecd3de2d320f63.png) [@system](https://community.gatling.io/u/system)\ **Post date:** [December 10, 2023, 2:40pm UTC](https://community.gatling.io/t/help-passing-a-saved-session-variable-to-a-java-method/8433/9 "2023-12-10T14:40:27Z")
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