java - Accessing a newly compiled program mid run -


i'm using ecj genetic programming , have built takes best fit individual program after run, , creates java class function lisp code created.

i have program compile java file. there anyway can run newly compiled class file in same run?

i want able to:

runmain --> create java --> compile class --> call function in newly created class --> endmainrun

so far, i'm having trouble calling method in newly created class.

every time create new java file , compile, rewrites old one. whenever class called later, it's running old function pre-overwrite. tips appreciated!

edit: here's basic pseudo code show i've got far, lot of abstracted. assume there mathfunction.class file before run this.

pseudocode main(){ rungeneticprogrammingalgorithm(); generatejavafilefrombestfitindividual(name = mathfunction.java) //replaces old mathfunction.java compile(mathfunction.java) //using javacompilerapi, replaces old mathfunction.class double value = mathfunction.calculate(25);

the old function returned -1 value, new function should return 5, it's still returning -1. if put in loop, it'll keep spitting out -1, -1, -1....

edit 2:

i'm still having return same value despite function being different. here code:

    url[] urls = null;      file dir = new file("src" + java.io.file.separator + "ec");      url url = dir.touri().tourl();      urls = new url[] { url };      classloader cl = new urlclassloader(urls);      class cls = cl.loadclass("ec.mathsolution");      mathsolution mathfunction = (mathsolution) cls.newinstance();      system.out.println(mathfunction.calculate(123.5));

edit 3:

found amazing source online here: http://www.toptal.com/java/java-wizardry-101-a-guide-to-java-class-reloading

achieving want non-trivial possible classloader magic.

the fact 'it's running old function pre-overwrite'... indicates creating instance of class same classloader got first time around.

i suggest reading on classloaders.

at high level algorithm should go:

  1. create java
  2. compile class
  3. create classloader child of current classloader.
  4. load class compiled @ step 2 using classloader
  5. instantiate class or otherwise use it.
  6. now see there new revision... start 1

i try edit answer code samples.


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