[Octave-bug-tracker] [bug #40111] support runtime selection of Java with JAVA_HOME on Linux and Unix systems

[Mike Miller]

Update of bug #40111 (project octave):

                 Summary: Support runtime selection of Java version on Linux
and Unix systems => support runtime selection of Java with JAVA_HOME on Linux
and Unix systems

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Follow-up Comment #10:

I think it might be nice / easier to maintain if most of the filesystem logic
were written in a .m file function. ov-java.cc could export a simple DEFUN
that would accept the full file name of libjvm.so or jvm.dll to use.

See also bug #53389 for the same feature on Windows, would override the
Windows registry setting.

The logic for finding the JRE should be something like


arch_name = ## FIXME: how to set Java arch names?
java_home = getenv ("JAVA_HOME");
if (isempty (java_home))
  java_home = __default_java_home__ ();  ## FIXME: some compiled-in default?
endif
jvm_lib = [];
if (exist (java_home, "dir"))
  tmp = fullfile (java_home, "jre");
  if (exist (tmp, "dir"))
    jre_dir = tmp;
  else
    jre_dir = java_home;
  endif

  dirs = { fullfile(jre_dir, "lib", "server"), ...
           fullfile(jre_dir, "lib", arch_name, "server"), ...
           fullfile(jre_dir, "lib", "client"), ...
           fullfile(jre_dir, "lib", arch_name, "client"), ...
         };
  for i = 1:length (dirs)
    if (exist (dirs{i}, "dir"))
      tmp = fullfile (dirs{i}, "libjvm.so");  ## FIXME: or jvm.dll on Windows
      if (exist (tmp, "file"))
        jvm_lib = tmp;
        break;
      endif
    endif
  endfor
endif


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