scala.MatchError: org\apache\commons\io\IOCase.class (of class java.lang.String) in sbt+assembly -


when user sbt assembly, prints error this:

[error] (*:assembly) scala.matcherror: org\apache\commons\io\iocase.class (of class java.lang.string)

and these configurations:

1、assembly.sbt:

import assemblykeys._ assemblysettings mergestrategy in assembly := {     case pathlist("org", "springframework", xs@_*) => mergestrategy.last }

2、bulid.sbt

import assemblykeys._ lazy val root = (project in file(".")).   settings(     name := "dmprealtimeflow",     version := "1.0",     scalaversion := "2.11.8",     librarydependencies += "com.jd.ads.index" % "ad_index_dmp_common" % "0.0.4-snapshot",     librarydependencies += "org.apache.spark" % "spark-core_2.11" % "2.1.0" % "provided",     librarydependencies += "org.apache.spark" % "spark-sql_2.11" % "2.1.0" % "provided",     librarydependencies += "org.apache.spark" % "spark-streaming_2.11" % "2.1.0" % "provided",     librarydependencies += "mysql" % "mysql-connector-java" % "5.1.8",     librarydependencies += "org.springframework" % "spring-beans" % "3.1.0.release",     librarydependencies += "org.springframework" % "spring-context" % "3.1.0.release",     librarydependencies += "org.springframework" % "spring-core" % "3.1.0.release",     librarydependencies += "org.springframework" % "spring-orm" % "3.1.0.release",     librarydependencies += "org.mybatis" % "mybatis" % "3.2.1" % "compile",     librarydependencies += "org.mybatis" % "mybatis-spring" % "1.2.2",     librarydependencies += "c3p0" % "c3p0" % "0.9.1.2"   )

3、project tools:

sbt:0.13.5 assembly:0.11.2 java:1.7 scala:2.11.8

any help?

the problem may in missing default case in mergestrategy in assembly block :

    case x =>       val oldstrategy = (assemblymergestrategy in assembly).value       oldstrategy(x)

also, mergestrategy deprecated , assemblymergestrategy should used instead.

basically 

{     case pathlist("org", "springframework", xs@_*) => mergestrategy.last }

is partial function string => mergestrategy defined 1 type of inputs, i.e. classes package prefix "org\springframework". however, applied class files in project , first 1 doesn't match prefix above (org\apache\commons\io\iocase.class) causes matcherror.


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