Most recent version of Java on Mac = can't open Dr. Java

duplicate of [bugs:#973]

DrJava is incompatible with Java 9 and Java 10. After Java 8, Oracle
completely changed the packaging of the JDK and JRE distributions of Java
(which had been invariant since Java 1.2 [2] twenty years ago. We are
working on a new version that is compatible with Java 9/10 but we no longer
have any outside funding supporting DrJava development so it is being done
in our "spare time". In the near term, you need to download a Java 8 JDK.
I am currently running JDK 8 build 181 on my Linux laptop. I hope that we
will have a Java 9/10 compatible version available at
www.cs.rice.edu/~javaplt/drjavarice by the end of October.

Incidentally, I know of no advantages to using Java 9 or 10 for CS A (or
the defunct AB for that matter) over Java 8. My online notes "The Elements
of Object-Oriented Progam Design" (in Java) were originally written when
Java 1.2, 1.3, and 1.4 were in widespread use. Java 1.5 (5) introduced
generic types so I added a few uses of generic types in my notes with a
promise (still unfulfilled) to include a short section in the notes
explaining generic types. Perhaps I will write such a section soon; I had
forgotten that it was still missing! BTW, the simple Java subset that I
use in my notes does not look anything like what is typically taught in the
CS A AP course (which generally ignores object-orientation). My notes
treat Java as a mostly functional language (like Scheme [Racket] or some
variant of ML [other than Haskell which is purely functional]). See
https://www.cs.rice.edu/~javaplt/papers/OOPEnrichesFP.pdf. Functional
programming in Java is wordy, wordy, wordy (in sharp contrast to OCaml or
Haskell) but still much nicer than imperative Java (which looks like C
dressed up in class definitions).

On Mon, Sep 10, 2018 at 7:37 PM Saige Gootman saigegootman@users.sourceforge.net wrote:

---

• [bugs:#974] https://sourceforge.net/p/drjava/bugs/974/ Most recent
  version of Java on Mac = can't open Dr. Java*

Status: open
Group: 4: Serious
Created: Tue Sep 11, 2018 12:37 AM UTC by Saige Gootman
Last Updated: Tue Sep 11, 2018 12:37 AM UTC
Owner: nobody
Attachments:

• Screen Shot 2018-09-10 at 8.30.04 PM.png
  https://sourceforge.net/p/drjava/bugs/974/attachment/Screen%20Shot%202018-09-10%20at%208.30.04%20PM.png
  (24.1 kB; image/png)

Hello,

I was told to download Dr. Java to use for my AP Computer Science A class,
but there seems to be a very large problem. I downloaded it onto my MacBook
Air through the Dr. Java website. Once I dragged it from Downloads to
Applications, I attempted to open the file (through control right click to
override the protection layer on the Mac) and it didn't open immediately. I
then got a popup about 30 seconds after I attempted to open it saying the
following:

"The Java JAR file "drjavabeta-20160913-225446.jar" could not be launched.
Check the Console for possible error messages."

A classmate had the same problem, while all of the other computers could
open Dr. Java easily. Both of our computers are updated with the latest
version of Java, and none of the other class computers are. Dr. Java is not
compatible with the latest version of Java, so therefore it cannot run on
my computer! Please fix this because I need it for class.

Thanks.

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