Can't provide a key.p12 File to connect to Google Cloud Datastore

Question

I am trying to connect to Google Cloud Datastore, I am following this tutorial :

https://cloud.google.com/datastore/docs/getstarted/start_java/

I am managing to connect and retrieve all the informations I want but I am connecting with options from environment like so :

datastore = DatastoreFactory.get().create(DatastoreHelper.getOptionsfromEnv() .dataset(datasetId).build());

Now I am trying to provide the options programmatically. As I understood I can do it by modifying the credentials like so :

datastore = DatastoreFactory.get() .create(DatastoreHelper .getOptionsfromEnv() .credential(credential) .dataset(datasetId).build());

Here is how I declare my credentials :

String filename = "XXX/src/main/webapp/WEB-INF/XXX9f29f.p12";

    credential = new GoogleCredential.Builder()
                        .setTransport(HTTP_TRANSPORT)
                        .setJsonFactory(JSON_FACTORY)
                        .setServiceAccountId("XXXX@developer.gserviceaccount.com")
                        .setServiceAccountPrivateKeyFromP12File(new File(filename)).build();

My problem is that I get a java.lang.NullPointerException from this line :

.setServiceAccountPrivateKeyFromP12File(new File(filename))

My application has read/write access to the file, which is located in the webapp/WEB-INF folder.

Here is my log output :

GRAVE: Unhandled exception
java.lang.NullPointerException
    at java.util.Collections$UnmodifiableCollection.<init>(Collections.java:1026)
    at java.util.Collections.unmodifiableCollection(Collections.java:1013)
    at com.google.api.client.googleapis.auth.oauth2.GoogleCredential.<init>(GoogleCredential.java:208)
    at com.google.api.client.googleapis.auth.oauth2.GoogleCredential$Builder.build(GoogleCredential.java:368)
    at com.databerries.bidder.DataBaseHandler.setEnv(DataBaseHandler.java:78)
    at com.databerries.bidder.WebServer.lambda$start$1(WebServer.java:75)
    ...
    at java.lang.Thread.run(Thread.java:745)

Thanks for any help :)

i think you have to provide full path of p12 file. you can find from here how to load resources from web-inf folder http://stackoverflow.com/questions/1108434/howto-load-a-resource-from-web-inf-directory-of-a-web-archive — chiragchavda.ks, Jun 23 '15 at 09:12
Thanks for the help, I now store my key in an InputStream, but I dont get how I can provide the setServiceAccountPrivateKeyFromP12File function with a File from an inputStream — Théo Richard, Jun 23 '15 at 11:23
try something like this http://www.mkyong.com/java/how-to-convert-inputstream-to-file-in-java/ — chiragchavda.ks, Jun 23 '15 at 12:29
if you found the solution please post as answer, it can be helpful to some one. — chiragchavda.ks, Jun 23 '15 at 18:49

score 1 · Accepted Answer · answered Jun 25 '15 at 11:43

1

My problem came from the way I created my credential object.

Instead of creating it from scracth, I now get it from a DatastoreHelper like so :

credential = DatastoreHelper.getServiceAccountCredential(serviceAccount, filename);

answered Jun 25 '15 at 11:43

Théo Richard

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Can't provide a key.p12 File to connect to Google Cloud Datastore

1 Answers1