firestore failed to get subcollection with permission denied error

Question

I want to get documents with all subcollections using java library.

My firestore has data above

/groups/group1/posts/post1
/groups/group1/users/user1

this is my rule, I set to permit all request for test.

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write: if true;
    }
  }
}

this is my java code

Iterable<CollectionReference> collections =
  db.collection("groups").document("group1").listCollections();

for (CollectionReference collRef : collections) {
  System.out.println("Found subcollection with id: " + collRef.getId());
}

but I met this error

Caused by: io.grpc.StatusRuntimeException: PERMISSION_DENIED: Missing or insufficient permissions.
    at io.grpc.Status.asRuntimeException(Status.java:535)

---

updated

this is not android sdk, official document is here

and this is my part of build.gradel

implementation 'com.google.cloud:google-cloud-firestore:3.2.0'
implementation group: 'com.google.cloud', name: 'google-cloud-storage', version: '2.7.1'

Answer 1

I changed few code lines for setting credential

  .setCredentialsProvider(FixedCredentialsProvider.create(credentials))

it make works clealy.