# sbt plugin - java.lang.NoSuchMethodError

**URL:** <https://community.gatling.io/t/sbt-plugin-java-lang-nosuchmethoderror/3793>\
**Category:** Gatling (Open-Source)\
**Created:** [June 28, 2017, 10:28am UTC](https://community.gatling.io/t/sbt-plugin-java-lang-nosuchmethoderror/3793 "2017-06-28T10:28:28Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Piotr\_Klubinski](https://avatars.discourse-cdn.com/v4/letter/p/58956e/32.png) [@Piotr\_Klubinski](https://community.gatling.io/u/Piotr_Klubinski)\
**Post date:** [June 28, 2017, 10:28am UTC](https://community.gatling.io/t/sbt-plugin-java-lang-nosuchmethoderror/3793/1 "2017-06-28T10:28:28Z")

</div>

Hi

I’m working on a POC, and researching few performance/load testing frameworks.  
I gave Gatling a try, I started with using gatling.sh, and it all was working fine, requests were going out, reports were generating.  
Then, in order to check how can I incorporate gatling tests into CI environment (not jenkins).  
I created sbt project in IntelliJ (no scala or sbt installed on machine) based on [sbt-plugin-demo](https://github.com/gatling/gatling-sbt-plugin-demo), and it used to work.

Today I came back to office, wanted to make some cleanup in git, and add few steps to scenario I was working on.  
And all of a sudden I started getting below error when running **gatling:test**

**`**

[error] Uncaught exception when running tests: java.lang.NoSuchMethodError: scala.Predef$.refArrayOps([Ljava/lang/Object;)Lscala/collection/mutable/ArrayOps;  
[trace] Stack trace suppressed: run last gatling:test for the full output.  
[info] Simulation(s) execution ended.  
[error] Error during tests:  
[error] Forked test harness failed: java.io.EOFException  
[error] at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2608)  
[error] at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1319)  
[error] at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)  
[error] at sbt.React.react(ForkTests.scala:122)  
[error] at sbt.ForkTests$$anonfun$mainTestTask$1$Acceptor$2$.run(ForkTests.scala:76)  
[error] at java.lang.Thread.run(Thread.java:745)  
[error] (gatling:test) sbt.TestsFailedException: Tests unsuccessful  
[error] Total time: 6 s, completed Jun 28, 2017 12:16:21 PM

**`**  
   
**build.sbt**

**`**

**```auto
name := "gatling"**

**version := "1.0"**

**scalaVersion in ThisBuild:= "2.12.2"**

**enablePlugins(GatlingPlugin)**

**scalacOptions := Seq(
  "-encoding", "UTF-8", "-target:jvm-1.8", "-deprecation",
  "-feature", "-unchecked", "-language:implicitConversions", "-language:postfixOps")**

**libraryDependencies += "io.gatling.highcharts" % "gatling-charts-highcharts" % "2.2.5" % "test,it"
libraryDependencies += "io.gatling" % "gatling-test-framework" % "2.2.5" % "test,it"**

**```**

 

**`**

**plugins.sbt**

**`**

**```auto
addSbtPlugin("io.gatling" % "gatling-sbt" % "2.2.1")**

**addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "3.0.0")**

**```**

 

**`**  
   
**my scenario:**

**`**

**```auto
import io.gatling.core.Predef._
import io.gatling.http.Predef._**

**class Login_QA extends Simulation {**

  **val httpConf = http
    .baseURL("XXX")
    .inferHtmlResources()**

  **val scn = scenario("Login")
    .exec(flushSessionCookies)
    .exec(http("getLogin")
      .get("XXX").check(status.is(_ => 200)))
    .exec(http("postLogin")
      .post("XXX")
      .formParam("a", "YY")
      .formParam("b", "YY")
      .check(status.is(_ => 200),
        header("X-AJAX-LOCATION").saveAs("auth")))
    .exec(http("getAuth")
      .get("${auth}")
      .check(status.is(_ => 200),
        currentLocationRegex("XXXX")))
    .exec(http("GET from REST")
      .get("/").disableFollowRedirect
      .resources(
        http("getProfile").get("/rest/profile/").check(jsonPath("$.firstName").exists),
        http("a").get("/rest/a"),
        http("b").get("/rest/b"),
        http("c").get("/rest/c"),
        http("d").get("/rest/d"),
        http("e").get("/rest/e"),
        http("f").get("/rest/f"),
        http("g").get("/rest/g"),
        http("g").get("/rest/h")
      )
    )**

  **setUp(
    scn.inject(atOnceUsers(1)).protocols(httpConf)
  ).assertions(
    global.responseTime.percentile1.lt(300)
  )
}**

**```**

 

**`**

---

<div class="post-metadata">

**Author:** ![Piotr\_Klubinski](https://avatars.discourse-cdn.com/v4/letter/p/58956e/32.png) [@Piotr\_Klubinski](https://community.gatling.io/u/Piotr_Klubinski)\
**Post date:** [June 28, 2017, 10:31am UTC](https://community.gatling.io/t/sbt-plugin-java-lang-nosuchmethoderror/3793/2 "2017-06-28T10:31:14Z")

</div>

some more output:

`

[IJ]\> last gatling:test  
[debug] javaOptions: List(-Didea.runid=c1488ea3-57c7-4d0b-8e73-4d85aa0e1132, -server, -Xmx1G, -XX:+UseG1GC, -XX:MaxGCPauseMillis=30, -XX:G1HeapRegionSize=16m, -XX:InitiatingHeapOccupancyPercent=75, -XX:+ParallelRefProcEnabled, -XX:+PerfDisableSharedMem, -XX:+AggressiveOpts, -XX:+OptimizeStringConcat, -XX:+HeapDumpOnOutOfMemoryError, -Djava.net.preferIPv4Stack=true, -Djava.net.preferIPv6Addresses=false)  
[debug] Forking tests - parallelism = false  
[debug] Create a single-thread test executor  
[error] Uncaught exception when running tests: java.lang.NoSuchMethodError: scala.Predef$.refArrayOps([Ljava/lang/Object;)Lscala/collection/mutable/ArrayOps;  
sbt.ForkMain$ForkError: java.lang.NoSuchMethodError: scala.Predef$.refArrayOps([Ljava/lang/Object;)Lscala/collection/mutable/ArrayOps;  
at io.gatling.sbt.GatlingRunner.tasks(GatlingRunner.scala:30)  
at sbt.ForkMain$Run.runTests(ForkMain.java:253)  
at sbt.ForkMain$Run.run(ForkMain.java:139)  
at sbt.ForkMain.main(ForkMain.java:121)  
[info] Simulation(s) execution ended.  
[error] Error during tests:  
[error] Forked test harness failed: java.io.EOFException  
[error] at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2608)  
[error] at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1319)  
[error] at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)  
[error] at sbt.React.react(ForkTests.scala:122)  
[error] at sbt.ForkTests$$anonfun$mainTestTask$1$Acceptor$2$.run(ForkTests.scala:76)  
[error] at java.lang.Thread.run(Thread.java:745)  
[error] (gatling:test) sbt.TestsFailedException: Tests unsuccessful

`

---

<div class="post-metadata">

**Author:** ![slandelle](https://dub1.discourse-cdn.com/flex013/user_avatar/community.gatling.io/slandelle/32/4_2.png) [@slandelle](https://community.gatling.io/u/slandelle)\
**Post date:** [June 28, 2017, 10:35am UTC](https://community.gatling.io/t/sbt-plugin-java-lang-nosuchmethoderror/3793/3 "2017-06-28T10:35:53Z")

</div>

> And all of a sudden I started getting below error when running  
> \*gatling:test\*

You've forcefully upgraded from Scala 2.11 (  
[https://github.com/gatling/gatling-sbt-plugin-demo/blob/master/build.sbt#L3](https://github.com/gatling/gatling-sbt-plugin-demo/blob/master/build.sbt#L3))  
to Scala 2.12. Those are major versions that are not compatible, and  
Gatling 2.2 targets Scala 2.11. Gatling 3 will target Scala 2.12.

\*Stéphane Landelle\*  
\*GatlingCorp CEO\*  
slandelle@gatling.io