title: I want to use a java project in python. On installing pip install pyjnius, it gives an error
body: <pre><code>pip install pyjnius
  Collecting pyjnius
    Using cached https://files.pythonhosted.org/packages/b6/57/c90acf31322e6417f06c90410dbfcb149633a6006b7efbf99dfebe177c1f/pyjnius-1.2.0.tar.gz
      ERROR: Command errored out with exit status 1:
       command: 'c:\users\dev1\appdata\local\programs\python\python37-32\python.exe' -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\Dev1\\AppData\\Local\\Temp\\pip-install-uxkserni\\pyjnius\\setup.py'"'"'; __file__='"'"'C:\\Users\\Dev1\\AppData\\Local\\Temp\\pip-install-uxkserni\\pyjnius\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base 'C:\Users\Dev1\AppData\Local\Temp\pip-install-uxkserni\pyjnius\pip-egg-info'
           cwd: C:\Users\Dev1\AppData\Local\Temp\pip-install-uxkserni\pyjnius\
      Complete output (18 lines):
      warning: [options] bootstrap class path not set in conjunction with -source 6
      error: Source option 6 is no longer supported. Use 7 or later.
      error: Target option 6 is no longer supported. Use 7 or later.
      WARNING: Not able to assign machine() = AMD64 to a cpu value!
               Using cpu = 'i386' instead!
      JDK_HOME: C:\Program Files\Java\jdk-13.0.1
  
      JRE_HOME: None
  
      Traceback (most recent call last):
        File "&lt;string&gt;", line 1, in &lt;module&gt;
        File "C:\Users\Dev1\AppData\Local\Temp\pip-install-uxkserni\pyjnius\setup.py", line 246, in &lt;module&gt;
          compile_native_invocation_handler(JDK_HOME, JRE_HOME)
        File "C:\Users\Dev1\AppData\Local\Temp\pip-install-uxkserni\pyjnius\setup.py", line 96, in compile_native_invocation_handler
          join('jnius', 'src', 'org', 'jnius', 'NativeInvocationHandler.java')
        File "c:\users\dev1\appdata\local\programs\python\python37-32\lib\subprocess.py", line 347, in check_call
          raise CalledProcessError(retcode, cmd)
      subprocess.CalledProcessError: Command '['C:\\Program Files\\Java\\jdk-13.0.1\\bin\\javac.exe', '-target', '1.6', '-source', '1.6', 'jnius\\src\\org\\jnius\\NativeInvocationHandler.java']' returned non-zero exit status 2.
      ----------------------------------------
  ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
  </code></pre>