Support Java 20, remove Java 7 support (#672)

* adding java 20 to build matrix

* change to zulu which has JDK20 available

* building class files for version 8 is the oldest now supported by JDJ > 17

* upgrade setup.py to java 8 too

* Exclude Java 20 for windows

* Switch back to temurin and skip windows-latest x86 java 20

---------

Co-authored-by: Mirko Galimberti <[email protected]>

.github/workflows/push.yml

@@ -18,7 +18,7 @@ jobs:
         java:
           - '8'
           - '11'
-          - '17'
+          - '20'
         os:
           - 'ubuntu-latest'
           - 'windows-latest'
@@ -45,6 +45,9 @@ jobs:
         - os: windows-latest
           architecture: 'x86'
           python: 'pypy-3.9'
+        - os: windows-latest
+          architecture: 'x86'
+          java: '20'
 
     runs-on: ${{ matrix.os }}
     steps:

build.xml

@@ -1,6 +1,6 @@
 <project>
-    <property name="ant.build.javac.source" value="1.7" />
-    <property name="ant.build.javac.target" value="1.7" />
+    <property name="ant.build.javac.source" value="8" />
+    <property name="ant.build.javac.target" value="8" />
 
     <target name="clean">
       <delete dir="build/classes"/>

setup.py

@@ -70,7 +70,7 @@ def getenv(key):
 def compile_native_invocation_handler(java):
     '''Find javac and compile NativeInvocationHandler.java.'''
     javac = java.get_javac()
-    source_level = '1.7'
+    source_level = '8'
     try:
         subprocess.check_call([
             javac, '-target', source_level, '-source', source_level,