Support for building benchmarks.jar not just running

[ktoso]

We need to be able to create a far "benchmarks.jar" like the maven version does

[mosesn]

This would be cool. Do you know what kind of work this would entail?

[ktoso]

Yeah, there's two ways to do this, the awesome one:

• make this plugin bring in also sbt-assembly, and make the task jmh:assembly produce the benchmarks.jar

The boring way:

• give instructions on how to use sbt-assembly

I would love to do the first way of course, but I'm not sure how to "bring in another plugin I depend on". I have to read up on this. Help is very welcome if you would like to try!

[mosesn]

How about we use the boring way for now--the awesome way seems easy enough to switch to later. I'll try it out for myself and report back.

[ktoso]

Sounds good to me!

[martin-magakian]

@mosesn @ktoso Any luck so far?

[mosesn]

@martin-magakian sorry, I don't remember this ticket at all, too much time has passed.

[aravind-work]

@ktoso - Firstly, thank you for writing this plugin. Did you end up using the sbt-assembly plugin to create a jar? If so, can you share the steps.

[ktoso]

If I did it would be documented and this ticket closed ;-) Pull requests welcome

[aravind-work]

@ktoso - I was able to get this working without much hassle. Included the sbt-assembly plugin -- addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.6") Then ran jmh:compile jmh:assembly The jar can then be run using java -cp /path/to/jar/assembly.jar org.openjdk.jmh.Main

[ktoso]

Oh that’s awesome news that it just worked :-) I’ll give it a try later as well then :)

We can simply document it then I guess

On Thu, May 10, 2018 at 19:26, binarybrewery notifications@github.com wrote:

@ktoso https://github.com/ktoso - I was able to get this working without much hassle. Included the sbt-assembly plugin -- addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.6") Then ran jmh:compile jmh:assembly The jar can then be run using java -cp /path/to/jar/assembly.jar org.openjdk.jmh.Main

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[kevin-dp]

@ktoso - I was able to get this working without much hassle. Included the sbt-assembly plugin -- addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.6") Then ran jmh:compile jmh:assembly The jar can then be run using java -cp /path/to/jar/assembly.jar org.openjdk.jmh.Main

This doesn't work for me. When i run the jar i get Exception in thread "main" java.lang.RuntimeException: ERROR: Unable to find the resource: /META-INF/BenchmarkList. Can somebody explain the "boring" way, i.e. give instructions on how to use sbt-assembly?

[kevin-dp]

I figured out how to build a fat jar using sbt-assembly. This is how i configured my build.sbt:

lazy val root = (project in file("."))
  .enablePlugins(JmhPlugin)
  .enablePlugins(JavaAppPackaging)

libraryDependencies ++= Seq(
  "org.openjdk.jmh" % "jmh-core" % "1.22",
  "org.openjdk.jmh" % "jmh-generator-annprocess" % "1.22"
)

assemblyJarName in assembly := "benchmarks.jar"

assemblyMergeStrategy in assembly := {
  case PathList("META-INF", "MANIFEST.MF") => MergeStrategy.discard
  case _ => MergeStrategy.first
}

// rewire tasks, so that 'jmh:assembly' automatically invokes 'jmh:compile' (otherwise a clean 'jmh:assembly' would fail)
assembly in Jmh := (assembly in Jmh).dependsOn(Keys.compile in Jmh).value

I previously used case PathList("META-INF", xs @ _*) => MergeStrategy.discard in my merge strategy which caused META-INF/BenchmarkList to be discarded, hence, i always got ERROR: Unable to find the resource: /META-INF/BenchmarkList. I fixed it by only discarding META-INF/MANIFEST.MF.

And plugins.sbt:

addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.3.7")
addSbtPlugin("com.typesafe.sbt" % "sbt-native-packager" % "1.3.4")
addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.10")

Now using sbt-assembly we can build a fat jar using jmh:assembly and run the resulting jar as follows: java -cp /path/to/benchmarks.jar org.openjdk.jmh.Main.