use full path when installing a jar

plugins/python-build/bin/python-build

@@ -534,7 +534,9 @@ fetch_jar() {
     download_tarball "$package_url" "$package_filename" "$checksum"
   fi
 
-  { if $JAVA -jar ${package_name}.jar -s -d ${package_name}; then
+  # Must use full path to jar and destination directory:
+  #   http://bugs.jython.org/issue2350
+  { if $JAVA -jar $PWD/${package_name}.jar -s -d $PWD/${package_name}; then
       if [ -z "$KEEP_BUILD_PATH" ]; then
         rm -f "$package_filename"
       else

plugins/python-build/share/python-build/jython-2.7.0

@@ -1,15 +1,6 @@
 require_java
 install_jar "jython-2.7.0" "https://repo1.maven.org/maven2/org/python/jython-installer/2.7.0/jython-installer-2.7.0.jar#b44352ece72382268a60e2848741c96609a91d796bb9a9c6ebeff62f0c12c9cf" jython
 
-# Jython is supposed to install pip using ensurepip by default, but this does
-# not appear to be working so we do it manually.
-#
-# pyenv's `ensurepip` downloads `get-pip.py` which isnt currently compatible
-# with jython: http://bugs.jython.org/issue2302
-#
-# Use the ensurepip module in jython to install the bundled pip instead:
-"$PYTHON_BIN" -m ensurepip
-
 case "$(pypy_architecture 2>/dev/null || true)" in
 "osx64"|"win32" )
   # Jython does not seem to work properly on OSX/windows unless JAVA_HOME is set