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Java Forum / GUI / January 2004Java On-Line Compiler
In addition to the recently posted article on the 'Short, Self-contained, Compileable Example', at.. http://www.physci.org/codes/sscce.jsp I have added an on-line compiler, (linked from the page) at.. http://www.physci.org/javac.jsp The on-line compiler is an excellent way to check that code is 'self-contained', as well as being small - the page will only accept source files up to 10Kb. Comments welcome. -- Andrew Thompson * http://www.PhySci.org/ PhySci software suite * http://www.1point1C.org/ 1.1C - Superluminal! * http://www.AThompson.info/andrew/ personal site > The on-line compiler is an excellent way to > check that code is 'self-contained', as well > as being small - the page will only accept > source files up to 10Kb. > > Comments welcome. works fine, except saving class file: Not Found The requested URL /home/physci2/public_html/public_compile/aa8QmelfSqJe/Test.class was not found on this server. Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request. Apache/1.3.29 Server at www.physci.org Port 80 ____________ http://reader.imagero.com the best java image reader. .... | The requested URL /home/physci2/public_html/public_compile/aa8QmelfSqJe/Test.class was not That's odd, it's definitely there (I checked). I will be looking into gathering all classes into a .jar file for the user (in the event that one source has a number of classes) I'll look into that at the same time and see if I can figure the problem. -- Andrew Thompson * http://www.PhySci.org/ PhySci software suite * http://www.1point1C.org/ 1.1C - Superluminal! * http://www.AThompson.info/andrew/ personal site | .... | | The requested URL /home/physci2/public_html/public_compile/aa8QmelfSqJe/Test.class | was not | | That's odd, it's definitely there (I checked). | I will be looking into gathering all classes | into a .jar file for the user (in the event that | one source has a number of classes) I think I have fixed the link problem, at the same time I took the opportunity to 'zip up' the class(es) and source into a .jar file, I'll have to do further checking before I can confirm I did it right.. [ And just to confirm - it will not work with packages, and does not (yet) create a manifest.. ] -- Andrew Thompson * http://www.PhySci.org/ PhySci software suite * http://www.1point1C.org/ 1.1C - Superluminal! * http://www.AThompson.info/andrew/ personal site > ... does not (yet) create a manifest. This might come in handy then http://www.javaworld.com/javaworld/javatips/jw-javatip127.html? | > ... does not (yet) create a manifest. | | This might come in handy then http://www.javaworld.com/javaworld/javatips/jw-javatip127.html? Thanks Thomas, yes that seems a good reference. I should get it done in the next few days. | > The on-line compiler is an excellent way to ... | Not Found | The requested URL /home/physci2/public_html/public_compile/aa8QmelfSqJe/Test.class was not | found on this server. D'Oh! What a dang fool. Now I have spotted my error (public_compile is at the root of my site) should have it fixed soon.. > The on-line compiler is an excellent way to > check that code is 'self-contained', as well > as being small - the page will only accept > source files up to 10Kb. > > Comments welcome. What I miss is possibility to start generated class file. Job for your Launcher. ____________ http://reader.imagero.com the best java image reader. | > The on-line compiler is an excellent way to | > check that code is 'self-contained', as well | > as being small - the page will only accept | > source files up to 10Kb. .... | What I miss is possibility to start generated class file. | Job for your Launcher. I was looking into this, but unfortunately there are dangers to allowing code to be run straight off the server, even if it is contained within the applet security sandbox at the user end. After all, it's easy to make an irritatingly recursive Applet that works completely within the confines of the sandbox. I shudder to imagine what malevolent people could come up with if they set their nasty little minds to it.. :-( -- Andrew Thompson * http://www.PhySci.org/ PhySci software suite * http://www.1point1C.org/ 1.1C - Superluminal! * http://www.AThompson.info/andrew/ personal site > | > The on-line compiler is an excellent way to > | > check that code is 'self-contained', as well [quoted text clipped - 17 lines] > people could come up with if they set > their nasty little minds to it.. :-( Just what I was thinking - you *don't* want to be running any pasted in code on your server :) You can bet your bottom dollar someone would abuse it. alex <from your other post> " ..that's very useful for testing code snippets people post!" I had to smile when I read how you worded that, as it is exactly to encourage people _not_ to post 'snippets'. The compiler will reject snippets as surely as javac from the command line.. ;-) ... | Just what I was thinking - you *don't* want to be running any pasted in | code on your server :) | You can bet your bottom dollar someone would abuse it. I think I may have been mistaken there... Given the code is actually running in the user's own JVM in their browser, it puts no special demands on my server. The _only_ malevolent thing I _think_ they could do is create an Applet (assuming I offer to show them applets in a page) that opens a new window with the same page, before refreshing itself [ I would call this applet 'BreedLikeRabbits' ;-) ] That _might_ cause trouble on whatever machine they run it, and cause a load on the server (until the applet is cached?) ...hmmm. I'll think about it further. (See also the other interesting development) > <from your other post> > " ..that's very useful for testing code snippets people post!" [quoted text clipped - 3 lines] > 'snippets'. The compiler will reject snippets as > surely as javac from the command line.. ;-) Oops, I didn't really mean snippets in that way, I meant self-contained runnable and all the rest of it! :) > ... > | Just what I was thinking - you *don't* want to be running any [quoted text clipped - 21 lines] > ...hmmm. I'll think about it further. > (See also the other interesting development) Be interested to hear if you find out more about the possibility of this and associated problems... Someone could deliberately overload your CPU as a sort of DOS attack which wouldn't be very desirable! Hmmm, any ways around that... alex > | What I miss is possibility to start generated class file. > | Job for your Launcher. [quoted text clipped - 12 lines] > people could come up with if they set > their nasty little minds to it.. :-( self-evident I didn't mean to run it on the server. I mean that you could generate page with applet. And user can decide if he want to run this applet. ____________ http://reader.imagero.com the best java image reader. | > | What I miss is possibility to start generated class file. | > | Job for your Launcher. ... | self-evident I didn't mean to run it on the server. | I mean that you could generate page with applet. | And user can decide if he want to run this applet. I am still trying to sort out the details of it in my own head ak [ it was not self-evident to me at the time ;-) ] Interestingly, I've made some other posts, wherein basically I am coming to the conclusion that maybe it is _only_ applets that will be a problem. Ironic really. Check for my post that mentions the BreedLikeRabbitsApplet... Still mulling it all over, but the apps are definitely launchable now, straight from the link. :-) -- Andrew Thompson * http://www.PhySci.org/ PhySci software suite * http://www.1point1C.org/ 1.1C - Superluminal! * http://www.AThompson.info/andrew/ personal site > In addition to the recently posted article on the > 'Short, Self-contained, Compileable Example', at.. [quoted text clipped - 9 lines] > > Comments welcome. Thanks Andrew, that's very useful for testing code snippets people post! Saves opening a new window, cutting and pasting the text to a new file etc... alex ... | I have added an on-line compiler, at.. | http://www.physci.org/javac.jsp Now updated, I implemented a suggestion by Jim Sculley to allow the example PhySci codes to be imported, by offering a link to the plain source from each page that displays 'formatted' source (for both the displayer and launcher pages) . Then I went the whole hog and added a drop-down list of the available source on the 'javac' page itself. The list excludes any source that is over the 10Kb limit I have set (so the ATM and Calculator are not listed). What else.. Oh yeah. I have switched on 'save ouput' by default, since it only seems to _fail_ on my local machine, the web server handles it fine.. Still working on the manifest file to allow 'double click launch' of the generated jar files.. -- Andrew Thompson * http://www.PhySci.org/ PhySci software suite * http://www.1point1C.org/ 1.1C - Superluminal! * http://www.AThompson.info/andrew/ personal site ... | Still working on the manifest file to allow | 'double click launch' of the generated jar | files.. Now done. Since I could not work head nor tail of Sun's 'Manifest' class, I sloppily just wrote the appropriate bytes to the JarOutputStream. Interestingly, you can click the link to the .jar file and if you choose 'open' rather than 'save to disk', it should actually launch straight from the link (I had _completely_ forgotten you can launch jar's from a link!) Of course, I would _prefer_ people to save it to disk first, that way they save bandwidth for themselves and me.. -- Andrew Thompson * http://www.PhySci.org/ PhySci software suite * http://www.1point1C.org/ 1.1C - Superluminal! * http://www.AThompson.info/andrew/ personal site Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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