Execution of a class from a class in different Eclipse project.

Question

I have 2 projects in Eclipse and i want to execute a class in one project from a class in the other project.The package hierachy of the classes are same under both the eclipse projects.
project1:
foo.hoo.E.java
project2 :
foo.hoo.F.java
Trying to run E.java from F.java using the code below.:-
try{     
     ProcessBuilder pb = null;
     pb = new ProcessBuilder("java",
               "-classpath",
               System.getProperty("java.class.path"),                         "-Xms16M",                         "-Xmx256M",                         "foo.hoo.E.java");
          Process process = pb.start();
          }catch (IOException e) {
The excetion of E.java does not actually take.Please suggest.

Answer 1

When you run the java command to start a new JVM the class name you supply is the name of the class, not the name of the java file. i.e. no .java. "foo.hoo.E" not "foo.hoo.E.java". Furthermore the class path you are using won't be likely to include the classes from the other project unless you've told eclipse to do so. (It might be enough to specifiy the E project as a run time dependancy).
This is, by the way, a very strange interpretation of the idea of "executing one class from another". In fact, in java, we don't execute classes, we execute programs. If you want to execute code in another class it's far more often sensible to call it within the same JVM, rather than lauch a new one. That's why your question has provoked so much irritation.