Hi,

I currently cannot get maven, because maven-core fails to build. To reproduce:

    guix shell maven

Log:

    [mkdir] Created dir: /tmp/guix-build-maven-core-3.8.5.drv-0/apache-maven-3.8.5/maven-core/build/jar
      [jar] Building jar: /tmp/guix-build-maven-core-3.8.5.drv-0/apache-maven-3.8.5/maven-core/build/jar/maven-core.jar

BUILD SUCCESSFUL
Total time: 1 second
phase `build' succeeded after 2.3 seconds
starting phase `generate-metadata'
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
[INFO] Discovered 58 component descriptors(s)
Problem executing command line.
Error stacktrace:
java.io.IOException: Invalid input descriptor for merge: /tmp/plexus-metadata3957336728290309540xml --> http://xml.org/sax/features/external-general-entities feature http://xml.org/sax/features/external-general-entities not supported for SAX driver org.codehaus.plexus.metadata.merge.Driver
	at org.codehaus.plexus.metadata.merge.AbstractMerger.mergeDescriptors(Unknown Source)
	at org.codehaus.plexus.metadata.DefaultMetadataGenerator.generateDescriptor(Unknown Source)
	at org.codehaus.plexus.metadata.PlexusMetadataGeneratorCli.invokePlexusComponent(Unknown Source)
	at org.codehaus.plexus.tools.cli.AbstractCli.execute(Unknown Source)
	at org.codehaus.plexus.tools.cli.AbstractCli.execute(Unknown Source)
	at org.codehaus.plexus.metadata.PlexusMetadataGeneratorCli.main(Unknown Source)
error: in phase 'generate-metadata': uncaught exception:
system-error "open-file" "~A: ~S" ("No such file or directory" "build/classes/META-INF/plexus/components.t.xml") (2) 
phase `generate-metadata' failed after 0.8 seconds
Backtrace:
          12 (primitive-load "/gnu/store/ndhm39px4lh3jrcqpkaa3ykwgji…")
In guix/build/gnu-build-system.scm:
    906:2 11 (gnu-build #:source _ #:outputs _ #:inputs _ #:phases . #)
In ice-9/boot-9.scm:
  1752:10 10 (with-exception-handler _ _ #:unwind? _ # _)
In srfi/srfi-1.scm:
    634:9  9 (for-each #<procedure 7ffff034be20 at guix/build/gnu-b…> …)
In ice-9/boot-9.scm:
  1752:10  8 (with-exception-handler _ _ #:unwind? _ # _)
In guix/build/gnu-build-system.scm:
   927:23  7 (_)
In ice-9/eval.scm:
    619:8  6 (_ #(#(#(#<directory (guile-user) 7ffff1fd3c80>) (…)) #))
   311:34  5 (_ #(#(#(#<directory (guile-user) 7ffff1fd3c80>) (…)) #))
   293:34  4 (_ #(#(#<directory (guile-user) 7ffff1fd3c80>) "build…"))
In ice-9/ports.scm:
   450:11  3 (call-with-input-file "build/classes/META-INF/plexus/c…" …)
In unknown file:
           2 (open-file "build/classes/META-INF/plexus/components.t…" …)
In ice-9/boot-9.scm:
  1685:16  1 (raise-exception _ #:continuable? _)
  1685:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1685:16: In procedure raise-exception:
In procedure open-file: No such file or directory: "build/classes/META-INF/plexus/components.t.xml"

Best wishes,
Arne
-- 
Unpolitisch sein
heißt politisch sein,
ohne es zu merken.
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