google appengine not supporting FileOutputStream

Question

I am trying to write to a file in Google appengine but it giving a error message java.io.FileOutputStream is not supported by Google App Engine's Java runtime environment

even though I imported

import java.io.File;
import java.io.FileInputStream;

import java.io.FileOutputStream;
import java.io.IOException;

Answer 1

Well it's not a java compiler error. This class is a restricted API in Google App Engine you are not allowed to use it.

Read about the GAE Java Runtime Environment and restrictions here: http://code.google.com/appengine/docs/java/runtime.html

The closest you will get to file storage on GAE is the Blobstore API: http://code.google.com/appengine/docs/java/blobstore/

If you need to create files in code GAE is not an appropriate platform for you.

Answer 2

Have you tried using java.io.ByteArrayOutputStream rather than FileOutputStream?

This should allow you to use your external libraries that require files but still work within the GAE JRE white list