executing a binary java file using Runtime.exec on server

Question

i am trying to build an online java compiler , written in jsp , where server end accepts uploaded code from clients , compile them and then run the codes and finally prints the output to the user to html forms. i wrote a code that creates a temporary java file (temp.java) contains the code from client , then compile it , creating the (temp.class) file , the problem is in the final step when i try to execute the file , it runs fine when i use the local machine cmd :

java temp

but when i call the command on the server using the java runTime like this :

Process proc = Runtime.getRuntime().exec("java testing/temp");

the output is :

Error: Could not find or load main class temp

the problem is , the runtime cant find the binary file.. what is the path then ? the compiler is in a package that contains the java files , while the clients binary files are createdand stored in a folder (testing) in build/web ..

This sounds like a fantastically bad idea. I give you ten minutes before you're pwned. — chrylis -cautiouslyoptimistic-
– chrylis -cautiouslyoptimistic-, Commented Jan 18, 2016 at 22:56
okay then how a good idea can work here ? i have no idea about how online compilers work , — Ahmad Tarraf
– Ahmad Tarraf, Commented Jan 18, 2016 at 23:06

eg04lt3r · Accepted Answer · 2016-01-18 22:58:01Z

1

Try to provide full path to your class. I think it should help.

answered Jan 18, 2016 at 22:58

eg04lt3r

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1 Comment

Ahmad Tarraf Over a year ago

i tried to get the full path using this : String absoluteDiskPath = getServletContext().getRealPath("/testing"); but it didnt work either ..

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