CODEWITHSUNDEEP
javalinuxitext
rage
rage

Reputation: 1837

Can Java File object be the cause of "Too many files open" error message on a linux machine

i am running a java program on a redhat linux machine. The program works just fine on my windows laptop but, when i run on the linux server i get a message saying: "Too many open files". Here is the code (roughly - i took out some parts) i'm working with: 

for(String f : fileList) {
        File file = new File(f);
        PdfReader reader = new PdfReader(f);

        for (int i = 1; i <= reader.getNumberOfPages(); i++) {

                if(condition is true){
                    String s = FilenameUtils.getFullPath(f);
                    File renameFile = new File(s + newfilename );
                    FileUtils.moveFile(file, renameFile);
                    break;
                }
        }
    }

The fileList is typically anywhere from 10,000 to 100,000 elements in length. I know that i should probably close the PdfReader object - and i will. But, i was wondering if the regular Java File objects can also cause the "Too many open files" error and if so, how do i properly "close" those kinds of objects?

Upvotes: 0

Views: 591

Answers (2)

chrylis -cautiouslyoptimistic-
chrylis -cautiouslyoptimistic-

Reputation: 77234

No. The Java File object basically wraps a filename, but it doesn't hold an open file handle until you use it to open a stream or reader.

Upvotes: 2

Peter Pei Guo
Peter Pei Guo

Reputation: 7870

Call close() on your handlers to release resources:

reader.close();

Upvotes: 2

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