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Babel: command line args in java
From: |
Jarmo Hurri |
Subject: |
Babel: command line args in java |
Date: |
Tue, 05 Nov 2019 17:21:51 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.2 (gnu/linux) |
* Intro
I am trying to supply command line arguments to java code in
babel. For this a logical option would be to use ~:cmdline~ header
argument, but I can not get it to work.
I really need to process the given values as command line arguments,
so setting some variable values will not work.
* This does not work
Because ~ob-java.el~ concatenates ~:cmdline~ before ~:classname~ ,
the straightforward way fails.
#+begin_src java :classname ArgumentExample :cmdline hi there org fans
:results output verbatim
class ArgumentExample
{
public static void main (String[] args)
{
for (String s : args)
System.out.println (s);
}
}
#+end_src
#+RESULTS:
The results is
#+begin_center
Error: Could not find or load main class hi
Caused by: java.lang.ClassNotFoundException: hi
#+end_center
The reason is this piece of code in ~ob-java.el~
#+begin_src elisp
(org-babel-eval (concat org-babel-java-command " " cmdline " " classname)
"")
#+end_src
* This compiles and runs but not as desired
The second try is to provide classname as the first argument. But a
~:classname~ header is also required, so the end result is not the
desired one.
#+begin_src java :classname ArgumentExample :cmdline ArgumentExample hi there
org fans :results output verbatim
class ArgumentExample
{
public static void main (String[] args)
{
for (String s : args)
System.out.println (s);
}
}
#+end_src
#+RESULTS:
: hi
: there
: org
: fans
: ArgumentExample
* This fix does not work either
When I try to leave out ~:classname~ , the process fails in early stages.
#+begin_src java :cmdline ArgumentExample hi there org fans :results output
verbatim
class ArgumentExample
{
public static void main (String[] args)
{
for (String s : args)
System.out.println (s);
}
}
#+end_src
#+begin_center
org-babel-execute:java: Can’t compile a java block without a classname
#+end_center
* Questions
1. Is there a correct way of doing this already?
2. If there is no better way, is this desired behaviour or should it
be fixed?
3. If this is desired behaviour, can I write a patch adding a new
header argument such as ~cmdargs~ ?
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