Upgraded to sbt 0.13.9; now I cannot launch sbt

Question

I upgraded sbt from version 0.13.8 to 0.13.9. We have Nexus proxying many repositories. Now, when I issue 'sbt' command - I get unresolved dependencies

scala-library
scala-compilre
scala-reflect 

all due to sha1 different from the computed. Is there a way to bypass sha1 validation? FYI. setting checksums in update := Nil in build.sbt does not solve the problem. I even tried putting <property name="ivy.checksums" value=""/> in ~/.ivy/ivysettings.xml still fails.

here is the console output:

D:\Temp\test>sbt -v update
Getting org.scala-sbt sbt 0.13.9 ...

:: problems summary ::
:::: WARNINGS
        problem while downloading module descriptor: http://nexusserver:8081/nexus/content/groups/mvn-repositories/org/scala-lang/scala-library/2.10.5/scala-library-2.10.5.pom: invalid sha1: expected=c39e31e37ce77d8d5fb8e8c640222275815d36f2 computed=4e8b721680f2defb491fe90447302658d464d5c
0 (351ms)

                module not found: org.scala-lang#scala-library;2.10.5

        ==== local: tried

          C:\Users\ak\.ivy2\local\org.scala-lang\scala-library\2.10.5\ivys\ivy.xml

          -- artifact org.scala-lang#scala-library;2.10.5!scala-library.jar:

          C:\Users\ak\.ivy2\local\org.scala-lang\scala-library\2.10.5\jars\scala-library.jar

        ==== my-ivy-proxy-releases: tried

          http://nexusserver:8081/nexus/content/groups/ivy-releases/org.scala-lang/scala-library/2.10.5/ivys/ivy.xml

        ==== my-maven-proxy-releases: tried

          http://nexusserver:8081/nexus/content/groups/mvn-repositories/org/scala-lang/scala-library/2.10.5/scala-library-2.10.5.pom

        problem while downloading module descriptor: http://nexusserver:8081/nexus/content/groups/mvn-repositories/org/scala-lang/scala-compiler/2.10.5/scala-compiler-2.10.5.pom: invalid sha1: expected=9a85822af1f9ea46b49dfdfa99eafc0bd819abaf computed=c3e0b6cf2f45a5a7cb052ef9e00f8fdac55e7
1b7 (69ms)

                module not found: org.scala-lang#scala-compiler;2.10.5

        ==== local: tried

          C:\Users\ak\.ivy2\local\org.scala-lang\scala-compiler\2.10.5\ivys\ivy.xml

          -- artifact org.scala-lang#scala-compiler;2.10.5!scala-compiler.jar:

          C:\Users\ak\.ivy2\local\org.scala-lang\scala-compiler\2.10.5\jars\scala-compiler.jar

        ==== my-ivy-proxy-releases: tried

          http://nexusserver:8081/nexus/content/groups/ivy-releases/org.scala-lang/scala-compiler/2.10.5/ivys/ivy.xml

        ==== my-maven-proxy-releases: tried

          http://nexusserver:8081/nexus/content/groups/mvn-repositories/org/scala-lang/scala-compiler/2.10.5/scala-compiler-2.10.5.pom

        problem while downloading module descriptor: http://nexusserver:8081/nexus/content/groups/mvn-repositories/org/scala-lang/scala-reflect/2.10.5/scala-reflect-2.10.5.pom: invalid sha1: expected=3a6fa11041ac0c8b4d5fcf9d4f1372ba8c0b7216 computed=30f1f646114a79eeefb254ead190f045c460564
9 (67ms)

                module not found: org.scala-lang#scala-reflect;2.10.5

        ==== local: tried

          C:\Users\ak\.ivy2\local\org.scala-lang\scala-reflect\2.10.5\ivys\ivy.xml

          -- artifact org.scala-lang#scala-reflect;2.10.5!scala-reflect.jar:

          C:\Users\ak\.ivy2\local\org.scala-lang\scala-reflect\2.10.5\jars\scala-reflect.jar

        ==== my-ivy-proxy-releases: tried

          http://nexusserver:8081/nexus/content/groups/ivy-releases/org.scala-lang/scala-reflect/2.10.5/ivys/ivy.xml

        ==== my-maven-proxy-releases: tried

          http://nexusserver:8081/nexus/content/groups/mvn-repositories/org/scala-lang/scala-reflect/2.10.5/scala-reflect-2.10.5.pom

                ::::::::::::::::::::::::::::::::::::::::::::::

                ::          UNRESOLVED DEPENDENCIES         ::

                ::::::::::::::::::::::::::::::::::::::::::::::

                :: org.scala-lang#scala-library;2.10.5: not found

                :: org.scala-lang#scala-compiler;2.10.5: not found

                :: org.scala-lang#scala-reflect;2.10.5: not found

                ::::::::::::::::::::::::::::::::::::::::::::::



:: USE VERBOSE OR DEBUG MESSAGE LEVEL FOR MORE DETAILS
unresolved dependency: org.scala-lang#scala-library;2.10.5: not found
unresolved dependency: org.scala-lang#scala-compiler;2.10.5: not found
unresolved dependency: org.scala-lang#scala-reflect;2.10.5: not found
Error during sbt execution: Error retrieving required libraries
  (see C:\Users\ak\.sbt\boot\update.log for complete log)
Error: Could not retrieve sbt 0.13.9

Answer 1

It turned out to be an ordering issue with our Nexus proxy repositories. oss.sonatype.org maven repo was causing an issue when it was placed ahead of the Maven Central repo. Removing oss.sonatype.org maven repository solved the problem.