Compiling c++ file from java

Question

My problem regards to compiling c++ file within java. I have tried execution of c#, it is fine. This extract code for compiling c#

ProcessBuilder launcher = new ProcessBuilder("gmcs","HelloWorld.cs");`

However, my code for c++

ProcessBuilder launcher =new ProcessBuilder("g++", "HelloWorld.cpp -o HelloWorld");

returns error=2, No such file or directory To indicate path I used
launcher.directory(new File(path)) in both of cases

print out that path somewhere in your code and see where it is. — David Mokon Bond
– David Mokon Bond, Commented Jan 30, 2013 at 14:55
The 1st thing I would think to check is whether g++ is in your PATH so that it can be called from wherever this java program is, and also whether the HelloWorld.cpp is in the same directory as your java app. Next I would check that I am using ProcessBuilder properly. — trumpetlicks
– trumpetlicks, Commented Jan 30, 2013 at 14:56

Konrad Rudolph · Accepted Answer · 2013-01-30 14:54:34Z

7

You need to provide arguments separately:

ProcessBuilder launcher =
    new ProcessBuilder("g++", "HelloWorld.cpp", "-o", "HelloWorld");

Otherwise the whole argument string is passed as one argument to the g++ executable, and g++ tries to find a file named HelloWorld.cpp\ -o\ HelloWorld (using escaped spaces as you would on a Linux terminal).

See the documentation for details on the usage.

answered Jan 30, 2013 at 14:54

Konrad Rudolph

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2 Comments

Aidos Askhatuly Over a year ago

That solved me the compilation problem and created HelloWorld file. Then I am using launcher.command("g++","./HelloWorld") to run it, but this return me null. is it right use of method? or there are should be another way?

Konrad Rudolph Over a year ago

@Aidos That’s now how you run executables. Why are you trying to pass it to the compiler (g++) again? Just run it directly, that’ll work.

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