I wrote those examples in an org file so I could test as I wrote them, and
then exported it to make it more readable, but the export resulted in
source block headers being lost.  Here is the same without export:
----
* Changes

- support for functional mode (~:results value~)
- accept variables
- don't require package, class, and main definitions
- write source and result tempfiles to ~org-babel-temporary-directory~, but
respects the ~:dir~ header
- work with tramp

* Examples
** Example 1
This outputs "hello."  If class and main definitions aren't given the
code block will be wrapped in generic ones.

#+begin_src java :results output silent
  System.out.print("hello");
#+end_src

This is exactly equivalent:

#+begin_src java :results output silent
  public class Main {
      public static void main(String[] args) {
          System.out.print("hello");
      }
  }
#+end_src

** Example 2
This also outputs "hello."

#+begin_src java :results value silent
  return "hello";
#+end_src

** Example 3
This generates the class "Example" in the package "org.orgmode" in the
current directory.

#+begin_src java :results output silent :classname org.orgmode.Example :dir
.
  System.out.print("hello, org-mode");
#+end_src

** Example 4
The "Hey" class defines a static method but no main. C-c C-c on the
"Hey" source block will write "./org/orgmode/Hey.java" and compile it.

The "Main" class calls the "Hey" class. C-c C-c on the "Main" source
block will write "./org/orgmode/Main.java" and compile and run it.

#+begin_src java :results output silent :dir .
  package org.orgmode;

  public class Hey {
      public static String say() {
          return "hey";
      }
  }
#+end_src

#+begin_src java :results output silent :dir .
  package org.orgmode;

  public class Main {
      public static void main(String[] args) {
          System.out.print(Hey.say());
      }
  }
#+end_src

Instead of C-c C-c, we could have added tangle headers and written the
source files out by tangling.

** Example 5
This prints the variable from the header

#+begin_src java :var msg="hello, org-mode" :results output silent
  System.out.print(msg);
#+end_src

** Example 6
This prints "hello, org-mode." The table is provided to the method as a
list of lists.

#+name: table
| message | hello, org-mode  |

#+begin_src java :var tbl=table :results output silent
  System.out.print(tbl.get(0).get(1));
#+end_src

** Example 7
This example returns a list.

Note that you're allowed to specify imports without defining the class
or main methods.

#+begin_src java :results value :exports both
  import java.util.Arrays;

  return Arrays.asList("message", "hello, org-mode");
#+end_src

#+RESULTS:
| message | hello, org-mode |

On Mon, Oct 5, 2020 at 8:35 AM ian martins <ianxm@jhu.edu> wrote:

> 1 Changes
> =========
>
>   - support for functional mode (`:results value')
>   - accept variables
>   - don't require package, class, and main definitions
>   - write source and result tempfiles to
>     `org-babel-temporary-directory', but respects the `:dir' header
>   - work with tramp
>
>
> 2 Examples
> ==========
> Some examples follow.  See the tests for more examples.  I'll write proper
> docs after review.
>
> 2.1 Example 1
> ~~~~~~~~~~~~~
>
>   This outputs "hello."  If class and main definitions aren't given the
>   code block will be wrapped in generic ones.
>
>   ,----
>   | System.out.print("hello");
>   `----
>
>   This is exactly equivalent:
>
>   ,----
>   | public class Main {
>   |     public static void main(String[] args) {
>   |         System.out.print("hello");
>   |     }
>   | }
>   `----
>
>
> 2.2 Example 2
> ~~~~~~~~~~~~~
>
>   This also outputs "hello."
>
>   ,----
>   | return "hello";
>   `----
>
>
> 2.3 Example 3
> ~~~~~~~~~~~~~
>
>   This generates the class "Example" in the package "org.orgmode" in the
>   current directory.
>
>   ,----
>   | System.out.print("hello, org-mode");
>   `----
>
>
> 2.4 Example 4
> ~~~~~~~~~~~~~
>
>   The "Hey" class defines a static method but no main. C-c C-c on the
>   "Hey" source block will write "./org/orgmode/Hey.java" and compile it.
>
>   The "Main" class calls the "Hey" class. C-c C-c on the "Main" source
>   block will write "./org/orgmode/Main.java" and compile and run it.
>
>   ,----
>   | package org.orgmode;
>   |
>   | public class Hey {
>   |     public static String say() {
>   |         return "hey";
>   |     }
>   | }
>   `----
>
>   ,----
>   | package org.orgmode;
>   |
>   | public class Main {
>   |     public static void main(String[] args) {
>   |         System.out.print(Hey.say());
>   |     }
>   | }
>   `----
>
>   Instead of C-c C-c, we could have added tangle headers and written the
>   source files out by tangling.
>
>
> 2.5 Example 5
> ~~~~~~~~~~~~~
>
>   This prints the variable from the header
>
>   ,----
>   | System.out.print(msg);
>   `----
>
>
> 2.6 Example 6
> ~~~~~~~~~~~~~
>
>   This prints "hello, org-mode." The table is provided to the method as
>   a list of lists.
>
>    message  hello, org-mode
>
>   ,----
>   | System.out.print(tbl.get(0).get(1));
>   `----
>
>
> 2.7 Example 7
> ~~~~~~~~~~~~~
>
>   This example returns a list.
>
>   Note that you're allowed to specify imports without defining the class
>   or main methods.
>
>   ,----
>   | import java.util.Arrays;
>   |
>   | return Arrays.asList("message", "hello, org-mode");
>   `----
>
>    message  hello, org-mode
>