implicit conversions are not applicable because they are ambiguous

Gatling (Open-Source)
1

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”).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).

2

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

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

3

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)

4

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

5

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