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Groups > comp.lang.java.programmer > #29414

Re: Java blunders

From Josip Almasi <joe@vrspace.org>
Newsgroups comp.lang.java.programmer
Subject Re: Java blunders
Date 2014-07-28 23:59 +0200
Organization B.net Hrvatska d.o.o.
Message-ID <lr6h3q$475$1@gregory.bnet.hr> (permalink)
References <jvbts91r2f9onj1e3dbr5lvqp70hmofkum@4ax.com>

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On 07/22/2014 08:41 PM, Roedy Green wrote:
> I have composed an essay about what I consider were the blunders in
> the design of Java.  I hold out hope many of them will eventually
> be fixed. You might like to add to the list.
>
>
> see http://mindprod.com/jgloss/javablunders.html

OK that's an interesting topic, thanks!:)
Let me add a few:

1) Multiple inheritance

Diamond problem, uh, it's hard, it's sooo haaaaard... let's skip it.
But you can extend two java classes in jython, and use new class in 
java. Problem solved.
And we have multiple inheritance in JavaFX, right?
So, why not in java SE?
That's feature critically lacking in java. But we are so used to live 
lacking it, we don't ever remember to mention it.

Note that ability to implement multiple interfaces has nothing to do 
with inheritance, it's multiple conformance.

2) Meta classes

Just a few times in quite a few years, most elegant design was parent 
class methods changing behaviour depending on subclass static variables.
Now, you can override them, but parent class method cannot access them!
There is no 'this' for class.
Obvious workaround is to use non-static member variables, thus wasting 
memory.
Better workaround is to use reflection to fetch subclass static 
variable/annotation value - reflection doesn't require 'this'.
Or, use Visitor, or... anyway, I ended with abstract method in 
superclass, and a lot of stupid copy&paste in all subclasses.
Well, it's ugly and stupid.

OK that's just one example, but one of many.
Better languages have meta classes to solve issues like this.

3) Beans, beans everywhere!

Using setters/getters for database access leads to retarded data models.
They don't do anything but accessing a private variable value.
Much the same with data transfer objects and many other applications of 
beans, but to lesser extent.
Only technical reason for this nonsense is Proxy, which is not available 
for variables, for public method call can be intercepted, and public 
variable access can not.
Err... waitaminit.
I always have a database access abstraction layer anyway.
That layer knows when anything is accessed, and has no need to intercept 
anything.
It only needs the ability to materialize a member variable.
So, what do we do?
But of course, we introduce JAXP, so we can generate java beans from 
XML. Then we break down JAXP compatibility with previous versions.
Or we introduce some other XMLization methods to generate data model and 
code.
Just awesome.

4) Error handling

Can I have central error handler please?
To get rid of division by zero once and for all.
(In addition to try/catch of course)

5) Resource bundles

... NPE, NPE, NPE.
BAD BAD BAD!
Only if it was checked exception.

Regards...

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Thread

Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-22 11:41 -0700
  Re: Java blunders Daniele Futtorovic <da.futt.news@laposte.net> - 2014-07-22 21:12 +0200
    Re: Java blunders Arne Vajhøj <arne@vajhoej.dk> - 2014-07-22 19:46 -0400
      Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-23 04:14 -0700
  Re: Java blunders Joerg Meier <joergmmeier@arcor.de> - 2014-07-22 23:47 +0200
    Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-23 04:23 -0700
      Re: Java blunders Martin Gregorie <martin@address-in-sig.invalid> - 2014-07-23 12:32 +0000
        Re: Java blunders Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-07-23 08:55 -0400
          Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-23 06:21 -0700
        Re: Java blunders Arne Vajhøj <arne@vajhoej.dk> - 2014-07-23 19:53 -0400
          Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-23 18:49 -0700
      Re: Java blunders Arne Vajhøj <arne@vajhoej.dk> - 2014-07-23 19:52 -0400
  Re: Java blunders Arne Vajhøj <arne@vajhoej.dk> - 2014-07-22 19:44 -0400
    Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-23 04:27 -0700
      Re: Java blunders Arne Vajhøj <arne@vajhoej.dk> - 2014-07-23 19:55 -0400
        Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-23 18:53 -0700
          Re: Java blunders Joerg Meier <joergmmeier@arcor.de> - 2014-07-24 11:24 +0200
            Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-25 06:34 -0700
          Re: Java blunders Arne Vajhøj <arne@vajhoej.dk> - 2014-07-24 19:31 -0400
            Re: Java blunders Gene Wirchenko <genew@telus.net> - 2014-07-25 13:22 -0700
              Re: Java blunders Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-07-25 17:17 -0400
                Re: Java blunders Martin Gregorie <martin@address-in-sig.invalid> - 2014-07-25 23:12 +0000
                Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-26 09:06 -0700
                Re: Java blunders Martin Gregorie <martin@address-in-sig.invalid> - 2014-07-26 20:11 +0000
                Re: Java blunders Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-07-26 17:27 -0400
                Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-27 10:49 -0700
                Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-27 10:10 -0700
                Re: Java blunders Gene Wirchenko <genew@telus.net> - 2014-07-28 13:53 -0700
                Re: Java blunders Stuart <DerTopper@web.de> - 2014-07-30 08:05 +0200
                Re: Java blunders Sebastian <news@seyweiler.dyndns.org> - 2014-07-30 11:12 +0200
                Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-27 10:13 -0700
                Re: Java blunders Martin Gregorie <martin@address-in-sig.invalid> - 2014-07-27 18:28 +0000
                Re: Java blunders Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-07-27 14:46 -0400
                Re: Java blunders Martin Gregorie <martin@address-in-sig.invalid> - 2014-07-27 21:18 +0000
                Re: Java blunders Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-07-27 18:10 -0400
                Re: Java blunders Martin Gregorie <martin@address-in-sig.invalid> - 2014-07-28 01:25 +0000
                Re: Java blunders Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-07-28 08:02 -0400
                Re: Java blunders Mike Amling <mamling@chaff.us> - 2014-07-31 13:26 -0500
                Re: Java blunders Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-07-31 14:48 -0400
                Re: Java blunders "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2014-07-28 13:22 +0100
                Re: Java blunders Martin Gregorie <martin@address-in-sig.invalid> - 2014-07-28 12:52 +0000
                Re: Java blunders Joerg Meier <joergmmeier@arcor.de> - 2014-07-28 23:38 +0200
                Re: Java blunders Martin Gregorie <martin@address-in-sig.invalid> - 2014-07-28 23:17 +0000
                Re: Java blunders Silvio <silvio@internet.com> - 2014-07-29 13:34 +0200
                Re: Java blunders Martin Gregorie <martin@address-in-sig.invalid> - 2014-07-29 12:45 +0000
                Re: Java blunders Silvio <silvio@internet.com> - 2014-07-29 17:10 +0200
                Re: Java blunders Martin Gregorie <martin@address-in-sig.invalid> - 2014-07-29 16:29 +0000
                Re: Java blunders lipska the kat <lipskathekat@example.com> - 2014-07-29 20:15 +0100
                Re: Java blunders Martin Gregorie <martin@address-in-sig.invalid> - 2014-07-29 22:02 +0000
                Re: Java blunders Silvio <silvio@internet.com> - 2014-07-29 22:43 +0200
                Re: Java blunders Martin Gregorie <martin@address-in-sig.invalid> - 2014-07-29 22:10 +0000
                Re: Java blunders Joshua Cranmer 🐧 <Pidgeot18@verizon.invalid> - 2014-07-27 19:18 -0500
                Re: Java blunders Gene Wirchenko <genew@telus.net> - 2014-07-28 13:54 -0700
                Re: Java blunders Arne Vajhøj <arne@vajhoej.dk> - 2014-07-31 23:07 -0400
                Re: Java blunders James Hostick <james.hostick@gmail.com> - 2014-08-01 22:10 -0700
            Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-26 08:31 -0700
              Re: Java blunders Martin Gregorie <martin@address-in-sig.invalid> - 2014-07-26 21:04 +0000
                Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-27 10:51 -0700
                Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-28 08:50 -0700
                Re: Java blunders Joerg Meier <joergmmeier@arcor.de> - 2014-07-28 23:42 +0200
              Re: Java blunders Arne Vajhøj <arne@vajhoej.dk> - 2014-07-31 23:04 -0400
          Re: Java blunders Josip Almasi <joe@vrspace.org> - 2014-07-28 22:23 +0200
            Re: Java blunders Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-07-28 16:39 -0400
              Re: Java blunders Josip Almasi <joe@vrspace.org> - 2014-07-29 00:11 +0200
              Re: Java blunders Jukka Lahtinen <jtfjdehf@hotmail.com.invalid> - 2014-07-30 12:07 +0300
                Re: Java blunders Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-07-30 08:05 -0400
    Re: Java blunders Wanja Gayk <brixomatic@yahoo.com> - 2014-07-25 01:34 +0200
      Re: Java blunders Arne Vajhøj <arne@vajhoej.dk> - 2014-07-24 19:43 -0400
  Re: Java blunders Joshua Cranmer 🐧 <Pidgeot18@verizon.invalid> - 2014-07-22 21:02 -0500
    Re: Java blunders Leif Roar Moldskred <leifm@huldreskog.lan> - 2014-07-23 02:01 -0500
      Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-23 18:58 -0700
      Re: Java blunders thinbluernime <thinbluernime3@gmail.com> - 2014-07-25 03:55 +0000
        Re: Java blunders Leif Roar Moldskred <leifm@huldreskog.lan> - 2014-07-25 00:32 -0500
          Re: Java blunders thinbluernime <thinbluernime3@gmail.com> - 2014-07-26 07:28 +0000
            Re: Java blunders "Gavino" <invalid@invalid.invalid> - 2014-07-26 19:43 +0200
        Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-25 06:36 -0700
          Re: Java blunders "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2014-07-25 15:47 +0100
            Re: Java blunders David Postill <david.postill@gmail.com> - 2014-07-25 18:29 +0200
            Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-26 09:27 -0700
        Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-25 06:37 -0700
    Re: Java blunders Joerg Meier <joergmmeier@arcor.de> - 2014-07-23 13:17 +0200
      Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-23 06:27 -0700
    Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-23 04:44 -0700
      Re: Java blunders Silvio <silvio@internet.com> - 2014-07-23 16:23 +0200
        Re: Java blunders Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-07-23 12:02 -0400
          Re: Java blunders Silvio <silvio@internet.com> - 2014-07-24 11:37 +0200
            Re: Java blunders Josip Almasi <joe@vrspace.org> - 2014-07-28 22:37 +0200
        Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-23 09:33 -0700
          Re: Java blunders thinbluernime <thinbluernime3@gmail.com> - 2014-07-25 03:57 +0000
        Re: Java blunders Arne Vajhøj <arne@vajhoej.dk> - 2014-07-23 21:38 -0400
          Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-23 18:59 -0700
            Re: Java blunders Martin Gregorie <martin@address-in-sig.invalid> - 2014-07-24 07:33 +0000
          Re: Java blunders Silvio <silvio@internet.com> - 2014-07-24 11:47 +0200
            Re: Java blunders Arne Vajhøj <arne@vajhoej.dk> - 2014-07-24 19:34 -0400
              Re: Java blunders Silvio <silvio@internet.com> - 2014-07-25 08:48 +0200
                Re: Java blunders Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-07-25 08:07 -0400
                Re: Java blunders "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2014-07-25 13:54 +0100
                Re: Java blunders Arne Vajhøj <arne@vajhoej.dk> - 2014-07-31 22:53 -0400
            Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-25 07:04 -0700
        Re: Java blunders Josip Almasi <joe@vrspace.org> - 2014-07-28 22:01 +0200
      Re: Java blunders Josip Almasi <joe@vrspace.org> - 2014-07-28 21:56 +0200
    Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-23 06:28 -0700
      Re: Java blunders Joshua Cranmer 🐧 <Pidgeot18@verizon.invalid> - 2014-07-23 08:33 -0500
    Re: Java blunders Arne Vajhøj <arne@vajhoej.dk> - 2014-07-23 21:34 -0400
      Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-23 19:06 -0700
      Re: Java blunders Joshua Cranmer 🐧 <Pidgeot18@verizon.invalid> - 2014-07-23 22:11 -0500
        Re: Java blunders Martin Gregorie <martin@address-in-sig.invalid> - 2014-07-24 07:36 +0000
          Re: Java blunders Arne Vajhøj <arne@vajhoej.dk> - 2014-07-24 19:39 -0400
            Re: Java blunders "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2014-07-25 13:40 +0100
        Re: Java blunders Arne Vajhøj <arne@vajhoej.dk> - 2014-07-24 19:38 -0400
          Re: Java blunders Gene Wirchenko <genew@telus.net> - 2014-07-25 13:30 -0700
  Re: Java blunders taqmcg@gmail.com - 2014-07-23 11:26 -0700
    Re: Java blunders Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-07-23 15:14 -0400
      Re: Java blunders thinbluernime <thinbluernime3@gmail.com> - 2014-07-25 04:07 +0000
        Re: Java blunders Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-07-25 08:35 -0400
          Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-26 09:41 -0700
        Re: Java blunders Wanja Gayk <brixomatic@yahoo.com> - 2014-08-03 16:41 +0200
          Re: Java blunders Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-08-03 11:31 -0400
    Re: Java blunders Joshua Cranmer 🐧 <Pidgeot18@verizon.invalid> - 2014-07-23 22:41 -0500
      Re: Java blunders taqmcg@gmail.com - 2014-07-24 10:09 -0700
        Re: Java blunders "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2014-07-25 13:22 +0100
        Re: Java blunders Joshua Cranmer 🐧 <Pidgeot18@verizon.invalid> - 2014-07-25 20:34 -0500
          Re: Java blunders "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2014-07-28 13:33 +0100
            Re: Java blunders Joshua Cranmer 🐧 <Pidgeot18@verizon.invalid> - 2014-07-28 08:35 -0500
        Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-26 09:44 -0700
          Re: Java blunders Martin Gregorie <martin@address-in-sig.invalid> - 2014-07-26 23:36 +0000
  Re: Java blunders Gene Wirchenko <genew@telus.net> - 2014-07-23 20:48 -0700
    Re: Java blunders Silvio <silvio@internet.com> - 2014-07-24 11:56 +0200
      Re: Java blunders Silvio <silvio@internet.com> - 2014-07-24 16:07 +0200
        Re: Java blunders Gene Wirchenko <genew@telus.net> - 2014-07-25 13:38 -0700
          Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-26 10:02 -0700
    Re: Java blunders Arne Vajhøj <arne@vajhoej.dk> - 2014-07-24 19:29 -0400
      Re: Java blunders Gene Wirchenko <genew@telus.net> - 2014-07-25 13:45 -0700
    Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-26 10:53 -0700
  Re: Java blunders Wanja Gayk <brixomatic@yahoo.com> - 2014-07-25 01:28 +0200
  Re: Java blunders "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2014-07-25 14:16 +0100
  Re: Java blunders Joerg Meier <joergmmeier@arcor.de> - 2014-07-25 17:39 +0200
  Re: Java blunders Roedy Green <see_website@mindprod.com.invalid> - 2014-07-26 16:21 -0700
  Re: Java blunders Josip Almasi <joe@vrspace.org> - 2014-07-28 23:59 +0200
    Re: Java blunders Josip Almasi <joe@vrspace.org> - 2014-07-29 00:41 +0200
      Re: Java blunders Josip Almasi <joe@vrspace.org> - 2014-07-29 01:54 +0200
    Re: Java blunders Arne Vajhøj <arne@vajhoej.dk> - 2014-07-31 22:38 -0400
    Re: Java blunders Arne Vajhøj <arne@vajhoej.dk> - 2014-07-31 22:39 -0400
  Re: Java blunders w.tom.adams@gmail.com - 2014-07-30 07:57 -0700
    Re: Java blunders Joshua Cranmer 🐧 <Pidgeot18@verizon.invalid> - 2014-07-30 10:22 -0500

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