SBT assembly issue: found String required sbt.Task[String] with

Question

I'm a long-term and happy user of sbt-assembly, but I've encountered a problem when using SBT 0.13.0 & sbt-assembly 0.10.1 on a new project. I have previously used code like this: ``` import sbtassembly.Plugin._ import AssemblyKeys._ lazy val sbtAssemblySettings = assemblySettings ++ Seq( // Slightly cleaner jar name jarName in assembly <<= (name, version) { (name, version) => name + "-" + version + ".jar" } ) lazy val buildSettings = ... ++ sbtAssemblySettings ``` This has worked fine for me in previous versions of SBT/sbt-assembly, but I'm now getting the error: ``` type mismatch; [error] found : String [error] required: sbt.Task[String] [error] jarName in assembly <<= (name, version) { (name, version) => name + "-" + version + ".jar" } [error] ^ [error] one error found ``` For completeness: the full project is available here. I can't help wondering is this issue is related to the New task/setting syntax in SBT 0.13.0: First, the old syntax is still supported with the intention of a…

Accepted Answer

It's not sbt 0.13, it's sbt-assembly. I accepted a pull req that changed the `jarName` from setting to task at 0.8.8:

breaking: jarName is now a task

Good news for those who want to generate jar names dynamically. Thanks to @dchenbecker, jarName in assembly is now a task #74.

Using sbt 0.13 syntax you don't have to worry about the task/setting difference any more:

```
jarName in assembly := {
  name.value + "-" + version.value + ".jar"
}
```

SBT assembly issue: found String required sbt.Task[String] with <<= syntax

Solution

Problem