gnu: Add java-plexus-component-metadata.

* gnu/packages/maven.scm (java-plexus-component-metadata): New variable.

gnu/packages/maven.scm

@@ -24,7 +24,53 @@
   #:use-module (guix build-system ant)
   #:use-module (gnu packages)
   #:use-module (gnu packages compression)
-  #:use-module (gnu packages java))
+  #:use-module (gnu packages java)
+  #:use-module (gnu packages xml))
+
+(define-public java-plexus-component-metadata
+  (package
+    (inherit java-plexus-container-default)
+    (name "java-plexus-component-metadata")
+    (arguments
+     `(#:jar-name "plexus-component-metadata.jar"
+       #:source-dir "src/main/java"
+       #:test-dir "src/test"
+       #:jdk ,icedtea-8
+       #:phases
+       (modify-phases %standard-phases
+         (add-before 'configure 'chdir
+           (lambda _
+             (chdir "plexus-component-metadata")
+             #t))
+         (add-before 'build 'copy-resources
+           (lambda _
+             (copy-recursively "src/main/resources"
+                               "build/classes/")
+             #t)))))
+    (inputs
+     `(("java-plexus-container-default" ,java-plexus-container-default)
+       ("java-plexu-component-annotations" ,java-plexus-component-annotations)
+       ("java-plexus-utils" ,java-plexus-utils)
+       ("java-plexus-cli" ,java-plexus-cli)
+       ("java-plexus-classworlds" ,java-plexus-classworlds)
+       ("maven-plugin-api" ,maven-plugin-api)
+       ("maven-plugin-annotations" ,maven-plugin-annotations)
+       ("maven-core-bootstrap" ,maven-core-bootstrap)
+       ("maven-model" ,maven-model)
+       ("java-commons-cli" ,java-commons-cli)
+       ("java-qdox" ,java-qdox)
+       ("java-jdom2" ,java-jdom2)
+       ("java-asm" ,java-asm)))
+    (native-inputs
+     `(("java-junit" ,java-junit)
+       ("java-guava" ,java-guava)
+       ("java-geronimo-xbean-reflect" ,java-geronimo-xbean-reflect)))
+    (synopsis "Inversion-of-control container for Maven")
+    (description "The Plexus project provides a full software stack for creating
+and executing software projects.  Based on the Plexus container, the
+applications can utilise component-oriented programming to build modular,
+reusable components that can easily be assembled and reused.  This package
+provides the Maven plugin generating the component metadata.")))
 
 (define-public maven-resolver-api
   (package