Google Application Credentials set and not found - amazon-web-services

Question

I have an Amazon EC2 with Linux Instance set up and running for my Java Web Application to consume REST requests. The problem is that I am trying to use Google Cloud Vision in this application to recognize violence/nudity in users pictures.
Accessing the EC2 in my Terminal, I set the GOOGLE_APPLICATION_CREDENTIALS by the following command, which I found in the documentation:
export GOOGLE_APPLICATION_CREDENTIALS=<my_json_path.json>
Here comes my first problem: When I restart my server, and ran 'echo $GOOGLE_APPLICATION_CREDENTIALS' the variable is gone. Ok, I set it to the bash_profile and bashrc and now it is ok.
But, when I ran my application, consuming the above code, to get the adult and violence status of my picture, I got the following error:
java.io.IOException: The Application Default Credentials are not available. They are available if running in Google Compute Engine. Otherwise, the environment variable GOOGLE_APPLICATION_CREDENTIALS must be defined pointing to a file defining the credentials. See https://developers.google.com/accounts/docs/application-default-credentials for more information.
My code is the following:
Controller:
if(SafeSearchDetection.isSafe(user.getId())) {
if(UserDB.updateUserProfile(user)==false){
throw new SQLException("Failed to Update");
}
} else {
throw new IOException("Explicit Content");
}
SafeSearchDetection.isSafe(int idUser):
String path = IMAGES_PATH + idUser + ".jpg";
try {
mAdultMedicalViolence = detectSafeSearch(path);
if(mAdultMedicalViolence.get(0) > 3)
return false;
else if(mAdultMedicalViolence.get(1) > 3)
return false;
else if(mAdultMedicalViolence.get(2) > 3)
return false;
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return true;
detectSafeSearch(String path):
List<AnnotateImageRequest> requests = new ArrayList<AnnotateImageRequest>();
ArrayList<Integer> adultMedicalViolence = new ArrayList<Integer>();
ByteString imgBytes = ByteString.readFrom(new FileInputStream(path));
Image img = Image.newBuilder().setContent(imgBytes).build();
Feature feat = Feature.newBuilder().setType(Type.SAFE_SEARCH_DETECTION).build();
AnnotateImageRequest request = AnnotateImageRequest.newBuilder().addFeatures(feat).setImage(img).build();
requests.add(request);
ImageAnnotatorClient client = ImageAnnotatorClient.create();
BatchAnnotateImagesResponse response = client.batchAnnotateImages(requests);
List<AnnotateImageResponse> responses = response.getResponsesList();
for (AnnotateImageResponse res : responses) {
if (res.hasError()) {
System.out.println("Error: "+res.getError().getMessage()+"\n");
return null;
}
SafeSearchAnnotation annotation = res.getSafeSearchAnnotation();
adultMedicalViolence.add(annotation.getAdultValue());
adultMedicalViolence.add(annotation.getMedicalValue());
adultMedicalViolence.add(annotation.getViolenceValue());
}
for(int content : adultMedicalViolence)
System.out.println(content + "\n");
return adultMedicalViolence;

Answer 1

My REST application was built above a Tomcat8. After no success running the command:
System.getenv("GOOGLE_APPLICATION_CREDENTIALS")
I realize that my problem was in the Environment Variables to Tomcat installation. To correct this, I just created a new file setenv.sh in my /bin with the content:
GOOGLE_APPLICATION_CREDENTIALS=<my_json_path.json>
And it worked!