Error when running gatling test

[pebert]

After doing a clone and following through the readme everything works except gatling throws an error after running "sbt gatling:test"

All I could find online was this pastebin https://pastebin.com/byJechzK with the same problem but no solution.

Compiling 1 Scala source to /path/to/play-scala-rest-api-example/target/scala-2.11/gatling-classes ...
Done compiling.
java.lang.NumberFormatException: null
at java.lang.Integer.parseInt(Integer.java:542)
at java.lang.Integer.parseInt(Integer.java:615)
at org.asynchttpclient.config.AsyncHttpClientConfigHelper$Config.getInt(AsyncHttpClientConfigHelper.java:85)
at org.asynchttpclient.config.AsyncHttpClientConfigDefaults.defaultMaxRedirects(AsyncHttpClientConfigDefaults.java:59)
at org.asynchttpclient.DefaultAsyncHttpClientConfig$Builder.(DefaultAsyncHttpClientConfig.java:582)
at io.gatling.http.ahc.DefaultAhcFactory.newAhcConfigBuilder(AhcFactory.scala:89)
at io.gatling.http.ahc.DefaultAhcFactory.(AhcFactory.scala:144)
at io.gatling.http.ahc.AhcFactory$.apply(AhcFactory.scala:46)
at io.gatling.http.ahc.HttpEngine$.apply(HttpEngine.scala:40)
at io.gatling.http.protocol.HttpProtocol$$anon$1.newComponents(HttpProtocol.scala:52)
at io.gatling.core.protocol.ProtocolComponentsRegistry.io$gatling$core$protocol$ProtocolComponentsRegistry$$$anonfun$1(Protocol.scala:57)

[marcospereira]

Thanks for reporting that, @pebert.

Problem is that this project is depending on scalatestplus-play 3.0.0-M3 which depends on play-ws 2.6.0-M4. And play-ws has the following problem:

playframework/playframework#7056
playframework/play-ws#87

So, we just need to update scalatestplus-play to the latest version here.