A Question for the Cracks - dynamic Compilation in Memory?

HI
i just wondered if it is possible to compile a java source file during runtime in MEMORY, means, without writing the class file to the filesystem but being able to create an instance of that compiled class file.
I guess, theoreticaly this must be possible, since i could try to take the output of the compiler as an input stream in my application an save that stream as a String (or somehow different) and then try to create the an instance using classloader and serialization (somehow.... problem is, i don't know yet how this excatly could be done).
I know, that question sounds a little bit strange, but I'm just thinking about a licening methode and this could do a very important part of it.
So i would be very thankfull for any comment about this idea!
josh

Yeah, but here's the thing. If you provide the source files to the program, then you've put the thief one step closer to having your program (they don't have to decompile it.) Even if you encrypt the source, once they've decrypted that they're still one step closer than if you just encrypted the bytecode.
In the encrypted class file solution, if the user doesn't have a legal license, they cannot run the program, because they cannot decrypt the classes. They have the encryption algorithm, but since they don't have a private key (which is in the license file) they can't load the code.
The license also, would be one-license-per-user, with a multitude of different licenses able to decrypt the same encrypted classes. If you don't want a particular party to have the program, you just don't give them a key, or give them a key which decrypts only a certain set of classes (effectively providing them with a functional demo.)
Even once the user has a license and your algorithm though, it still isn't trivial for them to make decrypted .class files out of them though, since your algorithm will load the classes as soon as they're created. They'd have to decompile and hack up the decryption code to write the classes back to files also.
You could probably also figure out some way to stamp an ID on each decrypted class at runtime, so you can tell which user is running the program so if someone does distribute decrypted versions of the classes, you can tell which user did it and start legal proceedings. :-)

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I have a project where I need to create an online application system, where the user has to fill in a form where the results have to be saved into a database.
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3) Is it possible to attach files to the form, like a photo? And also upload it to the web service.
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Hi Paul,
thanks for the quick answer. No my next challange is how to do things
1) validation: number & date checks, eg, a number should be higher than 4, or be a valid number/date
<answer> Yes
I think this is done through the object properties
2) If I answer A at question 1, I should skip Question 2 and go directly to Question 3. Is it possible to hide Question 2, depending on what I answered at Question 1?
<answer> Yes
This is done with subforms and scripting?
3) Is it possible to attach files to the form, like a photo? And also upload it to the web service.
<answer> PDF does support the ability to have attachments. They would be includeed as part of the PDF so you woudl have to submit the entire PDF and then extract the attachments when you get the file to the server. Note that you will require to Reader Extend the document to allow a Reader user to add the attachment. This is not a requirement if you are using Acrobat.
Have to look into this one.
4) After I submit the form, is it possible to lock the form so that no other changes can be made? In other words, you may only submit once.
<answer> Yes
Also through scripting?
5) Possible to activate the print button after the form has been submitted?
<answer> If you add a print button on the form then the answer is Yes. The application that houses the PDF will jhave print capabilities and that one is much more difficult to hide. You can set it up so that the form cannot be printed then return back the locked version with printing enabled but a round trip to the server is required for that.
Print button will be fine by now, probably also done by scripting
6) Can a drop-down lists be dynamic? Instead of hard coding the list, calling a web service to fill the values?
<answer> Yes but the form will require LiveCycle Reader Extensions if you are using Reader. Reader Extensions is not required if you are Acrobat.
Ahh, perhaps fixed list will be ok for version 1

A Question for the Cracks - dynamic Compilation in Memory?

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