gnu: java-plexus-archiver: Update to 4.2.2.

* gnu/packages/java.scm (java-plexus-archiver): Update to 4.2.2.
(java-plexus-container-default, java-commons-compress)
(java-geronimo-xbean-reflect): Install from pom file.
(java-guava): Install from pom
[source]: Use git source instead of generated source jar.
* gnu/packages/java-compression.scm (java-xz, java-iq80-snappy): Install
from pom.

gnu/packages/java-compression.scm

@@ -207,7 +207,6 @@ compressor/decompressor.")
      `(#:jar-name "iq80-snappy.jar"
        #:source-dir "src/main/java"
        #:test-dir "src/test"
-       #:jdk ,icedtea-8
        #:phases
        (modify-phases %standard-phases
          (replace 'check
@@ -228,7 +227,8 @@ compressor/decompressor.")
              ;; We don't have hadoop
              (delete-file "src/main/java/org/iq80/snappy/HadoopSnappyCodec.java")
              (delete-file "src/test/java/org/iq80/snappy/TestHadoopSnappyCodec.java")
-             #t)))))
+             #t))
+         (replace 'install (install-from-pom "pom.xml")))))
     (home-page "https://github.com/dain/snappy")
     (native-inputs
      `(("guava" ,java-guava)
@@ -303,14 +303,21 @@ It can be used as a replacement for the Apache @code{CBZip2InputStream} /
              ;; the package is not contained in a subdirectory
              (chdir "..")
              #t))
-         (replace 'install
-           (lambda* (#:key outputs #:allow-other-keys)
-             ;; Do we want to install *Demo.jar?
-             (install-file "build/jar/xz.jar"
-                           (string-append
-                             (assoc-ref outputs "out")
-                             "/share/java/xz.jar"))
-             #t)))))
+         (add-before 'install 'generate-pom
+           (lambda _
+             (copy-file "maven/pom_template.xml" "pom.xml")
+             (substitute* "pom.xml"
+               (("@VERSION@") ,version)
+               (("@TITLE@") "XZ data compression")
+               (("@HOMEPAGE@") "http://tukaani.org/xz/java.html"))
+             #t))
+        (add-before 'install 'rename-jar
+          (lambda _
+            (rename-file "build/jar/xz.jar"
+                         (string-append "build/jar/xz-" ,version ".jar"))
+            #t))
+        (replace 'install
+          (install-from-pom "pom.xml")))))
     (native-inputs
      `(("unzip" ,unzip)))
     (home-page "https://tukaani.org")