diff --git a/WORKSPACE b/WORKSPACE
index 2a02f6e..127ca3b 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -819,12 +819,6 @@
 # Test-only dependencies below.
 
 maven_jar(
-    name = "jimfs",
-    artifact = "com.google.jimfs:jimfs:1.1",
-    sha1 = "8fbd0579dc68aba6186935cc1bee21d2f3e7ec1c",
-)
-
-maven_jar(
     name = "junit",
     artifact = "junit:junit:4.12",
     sha1 = "2973d150c0dc1fefe998f834810d68f278ea58ec",
diff --git a/java/com/google/gerrit/server/restapi/project/CommitsCollection.java b/java/com/google/gerrit/server/restapi/project/CommitsCollection.java
index 21d7f0b..9e0661c 100644
--- a/java/com/google/gerrit/server/restapi/project/CommitsCollection.java
+++ b/java/com/google/gerrit/server/restapi/project/CommitsCollection.java
@@ -93,10 +93,12 @@
     try (Repository repo = repoManager.openRepository(parent.getNameKey());
         RevWalk rw = new RevWalk(repo)) {
       RevCommit commit = rw.parseCommit(objectId);
-      rw.parseBody(commit);
       if (!canRead(parent.getProjectState(), repo, commit)) {
         throw new ResourceNotFoundException(id);
       }
+      // GetCommit depends on the body of both the commit and parent being parsed, to get the
+      // subject.
+      rw.parseBody(commit);
       for (int i = 0; i < commit.getParentCount(); i++) {
         rw.parseBody(rw.parseCommit(commit.getParent(i)));
       }
diff --git a/java/com/google/gerrit/server/restapi/project/FilesInCommitCollection.java b/java/com/google/gerrit/server/restapi/project/FilesInCommitCollection.java
index 0d5ab88..0f408db 100644
--- a/java/com/google/gerrit/server/restapi/project/FilesInCommitCollection.java
+++ b/java/com/google/gerrit/server/restapi/project/FilesInCommitCollection.java
@@ -39,6 +39,10 @@
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.kohsuke.args4j.Option;
 
+/**
+ * like {@link FilesCollection}, but for commits that are specified as hex ID, rather than branch
+ * names.
+ */
 @Singleton
 public class FilesInCommitCollection implements ChildCollection<CommitResource, FileResource> {
   private final DynamicMap<RestView<FileResource>> views;
diff --git a/lib/nongoogle_test.sh b/lib/nongoogle_test.sh
index 4a09d80..bf53eb6 100755
--- a/lib/nongoogle_test.sh
+++ b/lib/nongoogle_test.sh
@@ -31,6 +31,7 @@
 j2objc
 jackson-annotations
 jackson-core
+jimfs
 jna
 jruby
 mina-core
diff --git a/tools/nongoogle.bzl b/tools/nongoogle.bzl
index b3f355b..52c9ca0 100644
--- a/tools/nongoogle.bzl
+++ b/tools/nongoogle.bzl
@@ -250,3 +250,9 @@
         artifact = "net.java.dev.jna:jna:5.5.0",
         sha1 = "0e0845217c4907822403912ad6828d8e0b256208",
     )
+
+    maven_jar(
+        name = "jimfs",
+        artifact = "com.google.jimfs:jimfs:1.1",
+        sha1 = "8fbd0579dc68aba6186935cc1bee21d2f3e7ec1c",
+    )