# implicit conversions are not applicable because they are ambiguous

**URL:** <https://community.gatling.io/t/implicit-conversions-are-not-applicable-because-they-are-ambiguous/583>\
**Category:** Gatling (Open-Source)\
**Created:** [September 16, 2013, 9:18pm UTC](https://community.gatling.io/t/implicit-conversions-are-not-applicable-because-they-are-ambiguous/583 "2013-09-16T21:18:53Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![Gururaj\_R](https://avatars.discourse-cdn.com/v4/letter/g/6a8cbe/32.png) [@Gururaj\_R](https://community.gatling.io/u/Gururaj_R)\
**Post date:** [September 16, 2013, 9:18pm UTC](https://community.gatling.io/t/implicit-conversions-are-not-applicable-because-they-are-ambiguous/583/1 "2013-09-16T21:18:53Z")

</div>

import com.excilys.ebi.gatling.core.Predef.\_  
import com.excilys.ebi.gatling.http.Predef.\_  
import com.excilys.ebi.gatling.http.Headers.\_  
import akka.util.duration.\_  
import bootstrap.\_  
import assertions.\_  
import akka.util.Duration

class SimpleScenario extends Simulation {  
val httpConf = httpConfig.baseURL(“[https://testServer.com](https://testServer.com)”).disableFollowRedirect;

val scn = scenario(“My Simple Scenario”)  
.feed(csv(“sample\_types.csv”).circular)  
.during(60 \* 60) {  
repeat(26, “latitude”) {  
repeat(192, “longitude”) {  
exec(  
http(“getNodeBugSummary”)  
.get("/bx/name")  
.queryParam(“action”,“getStuffFromServer”)  
.queryParam(“latitude”, “${latitude}”.toInt + 24)

.queryParam(“longitude”,"${longitude}")// + (-67l))  
//.queryParam(“sample”,"${sample}")  
//.check(jsonPath("$.data.results").saveAs(“response”))  
)  
}  
}  
}

//def mysetup = for (i ← 0 to 25) yield { scn.protocolConfig(httpConf).users(10).ramp(60).delay(i \* 3 \* 60);}  
//  
//setUp(  
//scn…users(10).protocolConfig(httpConf)

//setUp(scn.protocolConfig(httpConf));  
//setUp(scn.protocolConfig(httpConf).users(10).ramp(10).users(100).ramp(60\*10));  
setUp(scn.protocolConfig(httpConf).users(1));  
}

Using scala-compiler 2.9.2, I get the following error

tools/gatling-test/src/test/scala/SimpleScenario.scala:22: type mismatch;  
found : Int  
required: ?{val +(x$1: ?\>: Int \<: Any): ?}  
Note that implicit conversions are not applicable because they are ambiguous:  
both method int2long in object Predef of type (x: Int)Long  
and method int2float in object Predef of type (x: Int)Float  
are possible conversion functions from Int to ?{val +(x$1: ?\>: Int \<: Any): ?}  
.queryParam(“latitude”, “24”.toInt + “${latitude}”.toInt )  
^  
one error found

I am adding 24, since the loops start from 0. And didn’t found any loop constructs that start with given seed.  
please help me fix this (Using gatling version 1.5.2).

---

<div class="post-metadata">

**Author:** ![Excilys](https://avatars.discourse-cdn.com/v4/letter/e/8797f3/32.png) [@Excilys](https://community.gatling.io/u/Excilys)\
**Post date:** [September 16, 2013, 9:33pm UTC](https://community.gatling.io/t/implicit-conversions-are-not-applicable-because-they-are-ambiguous/583/2 "2013-09-16T21:33:35Z")

</div>

In Gatling 1, queryParam takes 2 (Session =\> String) parameters, and there’s an implicit conversion from String to (Session =\> String) that parses the String with the EL syntax. Implicit conversion ONLY happens when the expected type and the actual one don’t match.

Here, you’re passing:

- “latitude”: a String
- “24”.toInt + “${latitude}”.toInt: Have you read an example in the documentation that remotely resembles this? This is an instruction that returns an Int, but will fail at runtime because “${latitude}” can’t be parsed into an Int, like “24” would?

You want to perform a computation based on Session attributes, so you have to use a Session function:  
[https://github.com/excilys/gatling/wiki/Session#wiki-functions](https://github.com/excilys/gatling/wiki/Session#wiki-functions)

queryParam(“latitude”, (session: Session) =\> 24 + session.getTypedAttributeString.toInt)

---

<div class="post-metadata">

**Author:** ![Gururaj\_R](https://avatars.discourse-cdn.com/v4/letter/g/6a8cbe/32.png) [@Gururaj\_R](https://community.gatling.io/u/Gururaj_R)\
**Post date:** [September 17, 2013, 5:05am UTC](https://community.gatling.io/t/implicit-conversions-are-not-applicable-because-they-are-ambiguous/583/3 "2013-09-17T05:05:37Z")

</div>

def add(a: Int, b:Int) = (a+b).toString

val scn2 = scenario(“My Simple Scenario using repeat loops”)

.during(6) {

feed(csv(“sample\_types.csv”).circular)

repeat(26, “latitude”) {

repeat(195, “longitude”) {

exec(http(“getNodeBugSummary”)

.get("/bbproxy/DeliverableProxyServlet/bugsanddrugs")

.queryParam(“action”,“getnodebugsummary”)

.queryParam(“latitude”, (session: Session) =\> add(“24”.toInt, session.getTypedAttributeString.toInt))

.queryParam(“longitude”,"${longitude}")

.queryParam(“sample”,"${sample}")

)

}

}

}

above code compiles fine, but give error at runtime as below:

22:05:17.747 [GatlingSystem-akka.actor.default-dispatcher-6] ERROR c.e.e.g.h.action.HttpRequestAction - Action HttpRequestAction crashed, forwarding user to next one

java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String

at SimpleScenario$$anonfun$2.apply(SimpleScenario.scala:46) ~[test/:na]

at SimpleScenario$$anonfun$2.apply(SimpleScenario.scala:46) ~[test/:na]

at com.excilys.ebi.gatling.core.session.Session$$anonfun$evaluatableStringToEvaluatableStringSeq$1.apply(Session.scala:49) ~[gatling-core-1.5.2.jar:na]

at com.excilys.ebi.gatling.core.session.Session$$anonfun$evaluatableStringToEvaluatableStringSeq$1.apply(Session.scala:49) ~[gatling-core-1.5.2.jar:na]

at com.excilys.ebi.gatling.http.util.HttpHelper$$anonfun$httpParamsToFluentMap$1.apply(HttpHelper.scala:44) ~[gatling-http-1.5.2.jar:na]

at com.excilys.ebi.gatling.http.util.HttpHelper$$anonfun$httpParamsToFluentMap$1.apply(HttpHelper.scala:44) ~[gatling-http-1.5.2.jar:na]

at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:233) ~[scala-library-2.9.3.jar:na]

ala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:233) ~[scala-library-2.9.3.jar:na]

at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59) ~[scala-library-2.9.3.jar:na]

at scala.collection.immutable.List.foreach(List.scala:76) ~[scala-library-2.9.3.jar:na]

at scala.collection.TraversableLike$class.map(TraversableLike.scala:233) ~[scala-library-2.9.3.jar:na]

at scala.collection.immutable.List.map(List.scala:76) ~[scala-library-2.9.3.jar:na]

at com.excilys.ebi.gatling.http.util.HttpHelper$.httpParamsToFluentMap(HttpHelper.scala:44) ~[gatling-http-1.5.2.jar:na]

at com.excilys.ebi.gatling.http.request.builder.AbstractHttpRequestBuilder.configureQueryAndCookies(AbstractHttpRequestBuilder.scala:210) ~[gatling-http-1.5.2.jar:na]

at com.excilys.ebi.gatling.http.request.builder.AbstractHttpRequestBuilder.getAHCRequestBuilder(AbstractHttpRequestBuilder.scala:159) ~[gatling-http-1.5.2.jar:na]

at com.excilys.ebi.gatling.http.request.builder.AbstractHttpRequestBuilder.build(AbstractHttpRequestBuilder.scala:173) ~[gatling-http-1.5.2.jar:na]

at com.excilys.ebi.gatling.http.action.HttpRequestAction.execute(HttpRequestAction.scala:62) ~[gatling-http-1.5.2.jar:na]

at com.excilys.ebi.gatling.core.action.Action$$anonfun$receive$1.apply(Action.scala:31) ~[gatling-core-1.5.2.jar:na]

at com.excilys.ebi.gatling.core.action.Action$$anonfun$receive$1.apply(Action.scala:30) ~[gatling-core-1.5.2.jar:na]

at scala.PartialFunction$$anon$1.apply(PartialFunction.scala:76) ~[scala-library-2.9.3.jar:na]

at akka.actor.Actor$class.apply(Actor.scala:318) ~[akka-actor-2.0.4.jar:2.0.4]

at com.excilys.ebi.gatling.http.action.HttpRequestAction.apply(HttpRequestAction.scala:55) ~[gatling-http-1.5.2.jar:na]

at akka.actor.ActorCell.invoke(ActorCell.scala:626) ~[akka-actor-2.0.4.jar:2.0.4]

at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:197) ~[akka-actor-2.0.4.jar:2.0.4]

at akka.dispatch.Mailbox.run(Mailbox.scala:179) ~[akka-actor-2.0.4.jar:2.0.4]

at akka.dispatch.ForkJoinExecfigurator$MailboxExecutionTask.exec(AbstractDispatcher.scala:516) [akka-actor-2.0.4.jar:2.0.4]

at akka.jsr166y.ForkJoinTask.doExec(ForkJoinTask.java:259) [akka-actor-2.0.4.jar:2.0.4]

at akka.jsr166y.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:975) [akka-actor-2.0.4.jar:2.0.4]

at akka.jsr166y.ForkJoinPool.runWorker(ForkJoinPool.java:1479) [akka-actor-2.0.4.jar:2.0.4]

at akka.jsr166y.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104) [akka-actor-2.0.4.jar:2.0.4]

**22:05:17.784 [GatlingSystem-akka.actor.default-dispatcher-15] WARN c.e.e.gatling.core.session.ELParser$ - Couldn’t resolve EL ${sample}**

**Along with that looks like session is cleared?**

If I define a feeder with this, it works fine:

def coordinateMap = for(lat ← 24 to 50 ; long ← -67 to 125) yield { Map(“latitude” → lat.toString(), “longitude” → long.toString()) };

.feed(coordinateMap.toArray)

---

<div class="post-metadata">

**Author:** ![Gururaj\_R](https://avatars.discourse-cdn.com/v4/letter/g/6a8cbe/32.png) [@Gururaj\_R](https://community.gatling.io/u/Gururaj_R)\
**Post date:** [September 17, 2013, 5:09am UTC](https://community.gatling.io/t/implicit-conversions-are-not-applicable-because-they-are-ambiguous/583/4 "2013-09-17T05:09:06Z")

</div>

Even  
24".toInt + “${latitude}”.toInt  
gives below compilation error.

Users/gsetty/Perforce/perforce/gsetty/sandbox/gsetty/tools/gatling-test/src/test/scala/SimpleScenario.scala:46: type mismatch;  
found : Int(24)  
required: ?{val +(x$1: ?\>: Int \<: Any): ?}  
Note that implicit conversions are not applicable because they are ambiguous:  
both method int2long in object Predef of type (x: Int)Long  
and method int2float in object Predef of type (x: Int)Float  
are possible conversion functions from Int(24) to ?{val +(x$1: ?\>: Int \<: Any): ?}  
.queryParam(“latitude”, (session: Session) =\> 24 + session.getTypedAttributeString.toInt)  
^  
one error found

---

<div class="post-metadata">

**Author:** ![Excilys](https://avatars.discourse-cdn.com/v4/letter/e/8797f3/32.png) [@Excilys](https://community.gatling.io/u/Excilys)\
**Post date:** [September 17, 2013, 7:30am UTC](https://community.gatling.io/t/implicit-conversions-are-not-applicable-because-they-are-ambiguous/583/5 "2013-09-17T07:30:46Z")

</div>

Because now that “latitude” is no longer a value injected from a csv feeder, but a loop index, it’s no longer a String but an Integer, hence the CCE in getTypedAttribute.

What you want now is:

.queryParam(“latitude”, (session: Session) =\> (24 + session.getTypedAttributeInt).toString)

PS: stop with this “24”.toInt