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NoClassDefFoundError

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  NoClassDefFoundError emf <emfril@gmail.com> - 2012-12-31 21:24 -0500
    Re: NoClassDefFoundError Arne Vajhøj <arne@vajhoej.dk> - 2012-12-31 21:36 -0500
      Re: NoClassDefFoundError Lew <lewbloch@gmail.com> - 2013-01-01 00:25 -0800
        Re: NoClassDefFoundError lipska the kat <lipskathekat@yahoo.co.uk> - 2013-01-01 08:56 +0000
          Re: NoClassDefFoundError Lew <lewbloch@gmail.com> - 2013-01-01 01:12 -0800
            Re: NoClassDefFoundError lipska the kat <lipskathekat@yahoo.co.uk> - 2013-01-01 09:35 +0000
              Re: NoClassDefFoundError Magnus Warker <magnux@mailinator.com> - 2013-01-02 01:32 +0100
            Re: NoClassDefFoundError Roedy Green <see_website@mindprod.com.invalid> - 2013-01-02 09:49 -0800
              Re: NoClassDefFoundError Arne Vajhøj <arne@vajhoej.dk> - 2013-01-02 19:37 -0500
      Re: NoClassDefFoundError emf <emfril@gmail.com> - 2013-01-06 19:19 -0500
        Re: NoClassDefFoundError Arne Vajhøj <arne@vajhoej.dk> - 2013-01-06 19:26 -0500
          Re: NoClassDefFoundError emf <emfril@gmail.com> - 2013-01-09 01:18 -0500
            Re: NoClassDefFoundError Lew <lewbloch@gmail.com> - 2013-01-08 22:37 -0800
            Re: NoClassDefFoundError Arne Vajhøj <arne@vajhoej.dk> - 2013-01-09 21:36 -0500
              Re: NoClassDefFoundError Lew <lewbloch@gmail.com> - 2013-01-09 18:43 -0800
        Re: NoClassDefFoundError Lew <lewbloch@gmail.com> - 2013-01-06 17:29 -0800
    Re: NoClassDefFoundError Lew <lewbloch@gmail.com> - 2013-01-01 01:26 -0800
      Re: NoClassDefFoundError lipska the kat <lipskathekat@yahoo.co.uk> - 2013-01-01 09:38 +0000
    Re: NoClassDefFoundError Roedy Green <see_website@mindprod.com.invalid> - 2013-01-01 12:25 -0800

#20843 — NoClassDefFoundError

After a long time, I tried to create an applet. In eclipse it runs 
perfect as an applet, but in the webpage in the browser it gives a 
NoClassDefFoundError.

I even tried my very first program, HelloWorldApplet, but I got again 
the same problem.

What kind of problem is this? Is it a compilation issue? Or is it an 
eclipse problem? At this stage I would be happy to have the 
HelloWorldApplet run: I feel if I this runs, my other program will run too.

emf

-- 
It ain't THAT, babe! - A radical reinterpretation
https://files.nyu.edu/emf202/public/bd/itaintmebabe.html

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#20845

On 12/31/2012 9:24 PM, emf wrote:
> After a long time, I tried to create an applet. In eclipse it runs
> perfect as an applet, but in the webpage in the browser it gives a
> NoClassDefFoundError.
>
> I even tried my very first program, HelloWorldApplet, but I got again
> the same problem.
>
> What kind of problem is this? Is it a compilation issue? Or is it an
> eclipse problem? At this stage I would be happy to have the
> HelloWorldApplet run: I feel if I this runs, my other program will run too.

Impossible to say without more info.

It could be that the class/jar file is not correctly placed
or is not correctly served by the web server.

Arne

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#20846

Arne Vajhøj wrote:
> emf wrote:
>> After a long time, I tried to create an applet. In eclipse [sic] it runs
>> perfect as an applet, but in the webpage in the browser it gives a
>> NoClassDefFoundError.

Hmm. Could there be a dependent JAR missing in the browser context?

>> I even tried my very first program, HelloWorldApplet, but I got again

Example, please?
http://sscce.org/

>> the same problem.

Which would be ...?

Yes, yes, you said 'NoClassDefFoundError'. What was the *exact* message?

What is the code?

>> What kind of problem is this? 

http://docs.oracle.com/javase/7/docs/api/java/lang/NoClassDefFoundError.html

You did read this before, yes?

It explains exactly what kind of problem this is.

RTFM is sooo useful.

>> Is it a compilation issue?

Really? Come on.

>> Or is it an eclipse [sic] problem? 

Given that it doesn't happen in Eclipse, according to your report, I'd have to 
guess no.

>> At this stage I would be happy to have the HelloWorldApplet run: I feel if I this runs, my other program will run too.

"Feel"? Logic should rule.

> Impossible to say without more info.

Quite.

Although it's certainly possible to say this isn't a compilation error, 


        given that it happened at runtime


        and not during compilation.


> It could be that the class/jar file is not correctly placed
> or is not correctly served by the web server.

Or not referenced properly in the various tags and applet JAR.

How are you packaging the applet?

How are you specifying its classpath?

-- 
Lew

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#20847

On 01/01/13 08:25, Lew wrote:
> Arne Vajhøj wrote:
>> emf wrote:
>>> After a long time, I tried to create an applet. In eclipse [sic] it runs
>>> perfect as an applet, but in the webpage in the browser it gives a
>>> NoClassDefFoundError.

[snip]

> http://docs.oracle.com/javase/7/docs/api/java/lang/NoClassDefFoundError.html
>
> You did read this before, yes?
>
> It explains exactly what kind of problem this is.
>
> RTFM is sooo useful.

You really are an objectionable little oike aren't you.
Is there really any reason to be so rude ?

lipska

-- 
Lipska the Kat©: Troll hunter, sandbox destroyer
and farscape dreamer of Aeryn Sun

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#20848

lipska the kat wrote:
> You really are an objectionable little oike aren't you.

Yes, I'm afraid I am.

> Is there really any reason to be so rude ?

Well, now, let's wonder at who's being rude. This person jumps 
in to a discussion group to ask a question, ostensibly because 
they need help, but they ask a question that's answered by the 
most elementary initial step in analysis. This means they haven't 
even takent the most elementary initial step in analysis.

That's looking up the error and reading its description, in case 
you don't know.

Now failing to quote the error and provide code, that's fine, it's 
a rookie mistake and no one holds it against the newbie. You point 
them to http://sscce.org/ and request the missing data and everyone 
progresses.

But it's rude to come to a bunch of folks, especially if you think 
they are experts and presumably therefore worthy of respect, and just 
expect them to drop everything and spoon-feed you answers you aren't 
even going to understand anyway. It's beyond rude, it's presumptuous.

People here are inclined to help, voluntarily, for a variety of reasons. 

Yes, even this objectionable little oike is helping. Everything I've said 
is true and useful. Including the attitude. Go help yourself before you 
waste people's time with trivial questions you should have already 
answered yourself.

But perhaps you yourself are not of such advanced skill to find such 
behavioral failure an imposition.

-- 
Lew

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#20850

On 01/01/13 09:12, Lew wrote:
> lipska the kat wrote:
>> You really are an objectionable little oike aren't you.
>
> Yes, I'm afraid I am.
>
>> Is there really any reason to be so rude ?
>
[snip]
>
> But perhaps you yourself are not of such advanced skill to find such
> behavioral failure an imposition.

Ah yes, that must be it.

lipska

-- 
Lipska the Kat©: Troll hunter, sandbox destroyer
and farscape dreamer of Aeryn Sun

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#20863

On 01/01/2013 10:35 AM, lipska the kat wrote:
> On 01/01/13 09:12, Lew wrote:
>> lipska the kat wrote:
>>> You really are an objectionable little oike aren't you.
>>
>> Yes, I'm afraid I am.
>>
>>> Is there really any reason to be so rude ?
>>
> [snip]
>>
>> But perhaps you yourself are not of such advanced skill to find such
>> behavioral failure an imposition.
>
> Ah yes, that must be it.

Forget it, he's a complete idiot.

I put him into my killfile some time ago, but then I removed him because 
it's so funny reading his posts...

Magnus

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#20873

On Tue, 1 Jan 2013 01:12:01 -0800 (PST), Lew <lewbloch@gmail.com>
wrote, quoted or indirectly quoted someone who said :

>Well, now, let's wonder at who's being rude. 
 Oh come on Lew. You are the rudest person I have ever encountered in
my life. Your purpose of existence is to put down others and
discourage them.
-- 
Roedy Green Canadian Mind Products http://mindprod.com
Students who hire or con others to do their homework are as foolish 
as couch potatoes who hire others to go to the gym for them. 

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#20884

On 1/2/2013 12:49 PM, Roedy Green wrote:
> On Tue, 1 Jan 2013 01:12:01 -0800 (PST), Lew <lewbloch@gmail.com>
> wrote, quoted or indirectly quoted someone who said :
>
>> Well, now, let's wonder at who's being rude.
>   Oh come on Lew. You are the rudest person I have ever encountered in
> my life.

That may be true.

But then I will conclude that you have not seen much.

>          Your purpose of existence is to put down others and
> discourage them.

Are you reading his mind? Or just someone that has never
understood concepts like facts?

Arne

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#21082

On 2012-12-31 21:36 Arne Vajhøj wrote:
> On 12/31/2012 9:24 PM, emf wrote:
>> After a long time, I tried to create an applet. In eclipse it runs
>> perfect as an applet, but in the webpage in the browser it gives a
>> NoClassDefFoundError.
>>
>> I even tried my very first program, HelloWorldApplet, but I got again
>> the same problem.
>>
>> What kind of problem is this? Is it a compilation issue? Or is it an
>> eclipse problem? At this stage I would be happy to have the
>> HelloWorldApplet run: I feel if I this runs, my other program will run
>> too.
>
> Impossible to say without more info.
>
> It could be that the class/jar file is not correctly placed
> or is not correctly served by the web server.
>
> Arne

Thanks everybody for your replies and sorry for not having been more 
specific. I really did not expect to generate such a long thread, this 
is really a lively newsgroup! The problem was that eclipse (that's how 
it is capitalized it in the program's logo) insists on putting all 
classes into packages. When putting an applet in a webpage, the class 
has to be *in a folder with the same name* as it originally was in 
eclipse, and the webpage has to *call it from outside the folder*. I 
considered installing the SDK and compiling the applet without the 
package line on top, because I prefer to have the html and the applet in 
the same folder, but that has its own problems, so at this point since 
the program at last is working in my browser from an html file I count 
my blessings.

Eustace

-- 
Date Calculator with all-purpose JS code
https://files.nyu.edu/emf202/public/js/dateCalculator.html

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#21084

On 1/6/2013 7:19 PM, emf wrote:
> On 2012-12-31 21:36 Arne Vajhøj wrote:
>> On 12/31/2012 9:24 PM, emf wrote:
>>> After a long time, I tried to create an applet. In eclipse it runs
>>> perfect as an applet, but in the webpage in the browser it gives a
>>> NoClassDefFoundError.
>>>
>>> I even tried my very first program, HelloWorldApplet, but I got again
>>> the same problem.
>>>
>>> What kind of problem is this? Is it a compilation issue? Or is it an
>>> eclipse problem? At this stage I would be happy to have the
>>> HelloWorldApplet run: I feel if I this runs, my other program will run
>>> too.
>>
>> Impossible to say without more info.
>>
>> It could be that the class/jar file is not correctly placed
>> or is not correctly served by the web server.
>
> Thanks everybody for your replies and sorry for not having been more
> specific. I really did not expect to generate such a long thread, this
> is really a lively newsgroup! The problem was that eclipse (that's how
> it is capitalized it in the program's logo) insists on putting all
> classes into packages. When putting an applet in a webpage, the class
> has to be *in a folder with the same name* as it originally was in
> eclipse, and the webpage has to *call it from outside the folder*. I
> considered installing the SDK and compiling the applet without the
> package line on top, because I prefer to have the html and the applet in
> the same folder, but that has its own problems, so at this point since
> the program at last is working in my browser from an html file I count
> my blessings.

You really should use packages.

If you switch from deploying many class files to deploying a
single jar file, then you can have that jar file in same dir
as the html file.

Arne

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#21236

On 2013-01-06 19:26 Arne Vajhøj wrote:
> On 1/6/2013 7:19 PM, emf wrote:
>> On 2012-12-31 21:36 Arne Vajhøj wrote:
>>> On 12/31/2012 9:24 PM, emf wrote:
>>>> After a long time, I tried to create an applet. In eclipse it runs
>>>> perfect as an applet, but in the webpage in the browser it gives a
>>>> NoClassDefFoundError.
>>>>
>>>> I even tried my very first program, HelloWorldApplet, but I got again
>>>> the same problem.
>>>>
>>>> What kind of problem is this? Is it a compilation issue? Or is it an
>>>> eclipse problem? At this stage I would be happy to have the
>>>> HelloWorldApplet run: I feel if I this runs, my other program will run
>>>> too.
>>>
>>> Impossible to say without more info.
>>>
>>> It could be that the class/jar file is not correctly placed
>>> or is not correctly served by the web server.
>>
>> Thanks everybody for your replies and sorry for not having been more
>> specific. I really did not expect to generate such a long thread, this
>> is really a lively newsgroup! The problem was that eclipse (that's how
>> it is capitalized it in the program's logo) insists on putting all
>> classes into packages. When putting an applet in a webpage, the class
>> has to be *in a folder with the same name* as it originally was in
>> eclipse, and the webpage has to *call it from outside the folder*. I
>> considered installing the SDK and compiling the applet without the
>> package line on top, because I prefer to have the html and the applet in
>> the same folder, but that has its own problems, so at this point since
>> the program at last is working in my browser from an html file I count
>> my blessings.
>
> You really should use packages.
>
> If you switch from deploying many class files to deploying a
> single jar file, then you can have that jar file in same dir
> as the html file.
>
> Arne

I really can't see why packages are preferable, but the jar option is OK.

emf

-- 
It ain't THAT, babe! - A radical reinterpretation
https://files.nyu.edu/emf202/public/bd/itaintmebabe.html

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#21239

emf wrote:
> I really can't see why packages are preferable, but the jar option is OK.

The two are independent of each other.

Packages are a way to organize classes. Don't use the default (unnamed) package.

Why is explained in the Java tutorial.

"To make types easier to find and use, to avoid naming conflicts, and to 
control access".

You really should never use the default package.

JARs are a way to distribute applications. Different thing. JARs contain 
packages.

Learn to do it right. If you were to have done the research into your own 
question, that would have made it a useful question. Instead, you used the 
question, or rather the fact that you were ignorant of the answer, as a 
reason not to do the right thing.

This is not the way to become a good programmer. Instead, when you encounter 
a question, seek to answer it.

Then instead of "I don't see why" and perennial lack of skill in Java or 
whatever, you'll have, "I got this!"

-- 
Lew

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#21279

On 1/9/2013 1:18 AM, emf wrote:
> On 2013-01-06 19:26 Arne Vajhøj wrote:
>> On 1/6/2013 7:19 PM, emf wrote:
>>> On 2012-12-31 21:36 Arne Vajhøj wrote:
>>>> On 12/31/2012 9:24 PM, emf wrote:
>>>>> After a long time, I tried to create an applet. In eclipse it runs
>>>>> perfect as an applet, but in the webpage in the browser it gives a
>>>>> NoClassDefFoundError.
>>>>>
>>>>> I even tried my very first program, HelloWorldApplet, but I got again
>>>>> the same problem.
>>>>>
>>>>> What kind of problem is this? Is it a compilation issue? Or is it an
>>>>> eclipse problem? At this stage I would be happy to have the
>>>>> HelloWorldApplet run: I feel if I this runs, my other program will run
>>>>> too.
>>>>
>>>> Impossible to say without more info.
>>>>
>>>> It could be that the class/jar file is not correctly placed
>>>> or is not correctly served by the web server.
>>>
>>> Thanks everybody for your replies and sorry for not having been more
>>> specific. I really did not expect to generate such a long thread, this
>>> is really a lively newsgroup! The problem was that eclipse (that's how
>>> it is capitalized it in the program's logo) insists on putting all
>>> classes into packages. When putting an applet in a webpage, the class
>>> has to be *in a folder with the same name* as it originally was in
>>> eclipse, and the webpage has to *call it from outside the folder*. I
>>> considered installing the SDK and compiling the applet without the
>>> package line on top, because I prefer to have the html and the applet in
>>> the same folder, but that has its own problems, so at this point since
>>> the program at last is working in my browser from an html file I count
>>> my blessings.
>>
>> You really should use packages.
>>
>> If you switch from deploying many class files to deploying a
>> single jar file, then you can have that jar file in same dir
>> as the html file.
>
> I really can't see why packages are preferable, but the jar option is OK.

There are several good reasons to use packages.

1) It helps you structure you code (UML has packages too for
    the same purpose).

2) You can encapsulate you code better by using packages and
    package visibility so that internal code is not public.

3) You avoid name conflicts between your code and other code
    by putting your code in its own namespace(s).

4) Your code can be called from code in a namespace.

Arne

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#21280

Arne Vajhøj wrote:
> emf wrote:
>> I really can't see why packages are preferable, but the jar option is OK.
> 
> There are several good reasons to use packages.
> 
> 1) It helps you structure you code (UML has packages too for
>     the same purpose).
> 
> 2) You can encapsulate you code better by using packages and
>     package visibility so that internal code is not public.
> 
> 3) You avoid name conflicts between your code and other code
>     by putting your code in its own namespace(s).
> 
> 4) Your code can be called from code in a namespace.

In other words, those same benefits mentioned in the Java Tutorial, op. cit.

-- 
Lew

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#21096

emf wrote:
> The problem was that eclipse (that's how 
> 
> it is capitalized it in the program's logo) 

It is consistently spelled "Eclipse" everywhere in the text on their website.
http://www.eclipse.org/

The little header on the browser says, "Eclipse - The Eclipse Foundation".

Logos are not normative for the spelling of proper nouns. It is a specious 
justification.

-- 
Lew

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#20849

emf wrote:
> After a long time, I tried to create an applet. In eclipse it runs 
> perfect as an applet, but in the webpage in the browser it gives a 
> NoClassDefFoundError.

emf, in case I actually did hurt your feelings as "lipska the cat" and 
perhaps others think I might, I apologize. It isn't about your feelings.
It's about the information and way you should proceed to succeed.

If you want to be a good programmer, you have to be able to figure things 
out.

You will note that the link sends you right to the first piece of relevant 
information about your problem, and the only one we can assist with given 
the paucity of information you have provided.

The "you did read that before, yes?" is two things - a strong hint that 
you should have already if you didn't, and an acknowledgment that it's 
elementary advice if you did. Either way, it shouldn't hurt your feelings.
it's an objective question. You did read it before, yes? If not, you 
should have, and should develop the RTFM habit. It's objective. If so, then 
the question simply is to confirm the equally objective data.

Also, your questions asked for exactly the information given. If you need 
different data, you need different questions. This was also indicated 
in the two answers you got. We also asked for specific missing items.

If you examine the two answers, you will note a density of useful facts, 
useful questions, and advice for how to deal with the problem. 

You would be wise to follow up on the facts, answer our questions (here, 
publicly), and heed the advice.

But not blindly. Just heed the good advice.

-- 
Lew

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#20851

On 01/01/13 09:26, Lew wrote:
> emf wrote:
>> After a long time, I tried to create an applet. In eclipse it runs
>> perfect as an applet, but in the webpage in the browser it gives a
>> NoClassDefFoundError.
>
> emf, in case I actually did hurt your feelings as "lipska the cat" and
> perhaps others think I might, I apologize. It isn't about your feelings.
> It's about the information and way you should proceed to succeed.

My work here is done

For the time being ...

lipska

-- 
Lipska the Kat©: Troll hunter, sandbox destroyer
and farscape dreamer of Aeryn Sun

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#20856

On Mon, 31 Dec 2012 21:24:33 -0500, emf <emfril@gmail.com> wrote,
quoted or indirectly quoted someone who said :

>NoClassDefFoundError

my condolences. It is bitch to track down since it can have so many
causes. See
http://mindprod.com/jgloss/runerrormessages.html#NOCLASSDEFFOUNDERROR
-- 
Roedy Green Canadian Mind Products http://mindprod.com
Students who hire or con others to do their homework are as foolish 
as couch potatoes who hire others to go to the gym for them. 

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