Why does sbt assembly fail with "Not a valid command: assembly"?

Question

I installed Spark to C:\Spark1_6\spark-1.6.0-bin-hadoop2.6. After navigating to this path I am entering sbt assembly command and I am getting the following error message:

[error] Not a valid command: assembly
[error] Not a valid project ID: assembly
[error] Expected ':'
[error] Not a valid key: assembly
[error] assembly
[error]         ^

Here is my sbt project structure.

-Project101
  -project
     -build.properties
     -plugins.sbt
-src
-build.sbt

Here is my build.sbt:

name := "Project101"
version := "1.0"
scalaVersion := "2.10.2"
libraryDependencies ++= Seq(
  "org.apache.spark" % "spark-core_2.10" % "1.6.0" exclude ("org.apache.hadoop","hadoop-yarn-server-web-proxy"),
  "org.apache.spark" % "spark-sql_2.10" % "1.6.0" exclude ("org.apache.hadoop","hadoop-yarn-server-web-proxy"),
  "org.apache.spark" %% "spark-hive" % "1.6.0",
  "org.apache.spark" %% "spark-streaming" % "1.6.0",
  "org.apache.spark" %% "spark-streaming-kafka" % "1.6.0"
)
resolvers in Global ++= Seq(
  "Sbt plugins"                   at "https://dl.bintray.com/sbt/sbt-plugin-releases",
  "Maven Central Server"          at "http://repo1.maven.org/maven2",
  "TypeSafe Repository Releases"  at "http://repo.typesafe.com/typesafe/releases/",
  "TypeSafe Repository Snapshots" at "http://repo.typesafe.com/typesafe/snapshots/"
)

Here is the plugins.sbt:

addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.12.0")

sbt package command is working and able to create the jar file. But I had to execute sbt assembly command too but is not working.

Answer 1

Not a valid command: assembly

Whenever you face the error message, please make sure you're in the top-level directory of the project with the sbt-assembly plugin installed.

If you have a project in Project101 directory, make sure that project/plugins.sbt has the line in:

addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.12.0")

With that, you should again be in Project101 directory and execute sbt assembly. That should execute the plugin to create an uber-jar.