CODEWITHSUNDEEP
java
Blood Sport
Blood Sport

Reputation: 125

Execution of java command in Runtime

Process process2 = Runtime.getRuntime().exec(new String[]{"javac","-g:vars","/Users/amol/Documents/Java/a.java"});
Process process3 = Runtime.getRuntime().exec(new String[]{"javap","-l","-c","/Users/amol/Documents/Java/a"});

I tried to run this code but I am facing a strange problem. It compiles correctly (means the first line compiles the program) but the second line gives an error saying that 'a' not found. However when I checked the given directory a.class file was created correctly. How should I correctly run the second line?

Upvotes: 1

Views: 189

Answers (2)

cutebug
cutebug

Reputation: 475

You may have to specify the classpath argument for javap upto the directory of the class.

Process process3 = Runtime.getRuntime().exec(new String[]{"javap","-l","-c","-classpath  \"/Users/amol/Documents/Java/\"","a"});

Upvotes: 1

Jon Skeet
Jon Skeet

Reputation: 1501656

javap takes a class name, not a filename. You probably want to execute:

javap -l -c -classpath /Users/amol/Documents/Java a

(Split that into string arguments appropriately, of course.)

Note that this will still fail if a is in a package - or if the class in a.java isn't actually a at all (which is valid for non-public classes). In both of these cases, you'd need to determine the classes involved, probably by building into an empty directory and finding out which files are produced by javac.

Upvotes: 2

Related Questions