diff --git a/mobile/android/base/background/fxa/FxAccountUtils.java b/mobile/android/base/background/fxa/FxAccountUtils.java
index c70c59bb0eba..b77c5eb5a072 100644
--- a/mobile/android/base/background/fxa/FxAccountUtils.java
+++ b/mobile/android/base/background/fxa/FxAccountUtils.java
@@ -185,6 +185,6 @@ public class FxAccountUtils {
    */
   public static String getAudienceForURL(String serverURI) throws URISyntaxException {
     URI uri = new URI(serverURI);
-    return new URI(uri.getScheme(), uri.getHost(), null, null).toString();
+    return new URI(uri.getScheme(), null, uri.getHost(), uri.getPort(), null, null, null).toString();
   }
 }
diff --git a/mobile/android/base/browserid/MockMyIDTokenFactory.java b/mobile/android/base/browserid/MockMyIDTokenFactory.java
index c807d4cbbd3a..ee4933ec3b2f 100644
--- a/mobile/android/base/browserid/MockMyIDTokenFactory.java
+++ b/mobile/android/base/browserid/MockMyIDTokenFactory.java
@@ -21,7 +21,7 @@ public class MockMyIDTokenFactory {
   public static final BigInteger MOCKMYID_g = new BigInteger("c52a4a0ff3b7e61fdf1867ce84138369a6154f4afa92966e3c827e25cfa6cf508b90e5de419e1337e07a2e9e2a3cd5dea704d175f8ebf6af397d69e110b96afb17c7a03259329e4829b0d03bbc7896b15b4ade53e130858cc34d96269aa89041f409136c7242a38895c9d5bccad4f389af1d7a4bd1398bd072dffa896233397a", 16);
 
   // Computed lazily by static <code>getMockMyIDPrivateKey</code>.
-  protected static SigningPrivateKey cachedMockMyIDPrivateKey;
+  protected static SigningPrivateKey cachedMockMyIDPrivateKey = null;
 
   public static SigningPrivateKey getMockMyIDPrivateKey() throws NoSuchAlgorithmException, InvalidKeySpecException {
     if (cachedMockMyIDPrivateKey == null) {
diff --git a/mobile/android/base/fxa/authenticator/FxAccountAuthenticatorService.java b/mobile/android/base/fxa/authenticator/FxAccountAuthenticatorService.java
index d138e6c45a2e..d66163a81616 100644
--- a/mobile/android/base/fxa/authenticator/FxAccountAuthenticatorService.java
+++ b/mobile/android/base/fxa/authenticator/FxAccountAuthenticatorService.java
@@ -14,7 +14,7 @@ public class FxAccountAuthenticatorService extends Service {
   public static final String LOG_TAG = FxAccountAuthenticatorService.class.getSimpleName();
 
   // Lazily initialized by <code>getAuthenticator</code>.
-  protected FxAccountAuthenticator accountAuthenticator;
+  protected FxAccountAuthenticator accountAuthenticator = null;
 
   protected synchronized FxAccountAuthenticator getAuthenticator() {
     if (accountAuthenticator == null) {
diff --git a/mobile/android/base/fxa/sync/FxAccountSyncAdapter.java b/mobile/android/base/fxa/sync/FxAccountSyncAdapter.java
index b13cd0c26a6b..903c10d328ca 100644
--- a/mobile/android/base/fxa/sync/FxAccountSyncAdapter.java
+++ b/mobile/android/base/fxa/sync/FxAccountSyncAdapter.java
@@ -74,7 +74,7 @@ public class FxAccountSyncAdapter extends AbstractThreadedSyncAdapter {
   // Used to do cheap in-memory rate limiting. Don't sync again if we
   // successfully synced within this duration.
   private static final int MINIMUM_SYNC_DELAY_MILLIS = 15 * 1000;        // 15 seconds.
-  private volatile long lastSyncRealtimeMillis;
+  private volatile long lastSyncRealtimeMillis = 0L;
 
   protected final ExecutorService executor;
   protected final FxAccountNotificationManager notificationManager;
diff --git a/mobile/android/base/fxa/sync/FxAccountSyncService.java b/mobile/android/base/fxa/sync/FxAccountSyncService.java
index 59c06ca97609..0d271e8615d4 100644
--- a/mobile/android/base/fxa/sync/FxAccountSyncService.java
+++ b/mobile/android/base/fxa/sync/FxAccountSyncService.java
@@ -10,7 +10,7 @@ import android.os.IBinder;
 
 public class FxAccountSyncService extends Service {
   private static final Object syncAdapterLock = new Object();
-  private static FxAccountSyncAdapter syncAdapter;
+  private static FxAccountSyncAdapter syncAdapter = null;
 
   @Override
   public void onCreate() {
diff --git a/mobile/android/base/fxa/sync/FxAccountSyncStatusHelper.java b/mobile/android/base/fxa/sync/FxAccountSyncStatusHelper.java
index fc4b33f866cf..fad35584a95c 100644
--- a/mobile/android/base/fxa/sync/FxAccountSyncStatusHelper.java
+++ b/mobile/android/base/fxa/sync/FxAccountSyncStatusHelper.java
@@ -23,7 +23,7 @@ public class FxAccountSyncStatusHelper implements SyncStatusObserver {
   @SuppressWarnings("unused")
   private static final String LOG_TAG = FxAccountSyncStatusHelper.class.getSimpleName();
 
-  protected static FxAccountSyncStatusHelper sInstance;
+  protected static FxAccountSyncStatusHelper sInstance = null;
 
   public synchronized static FxAccountSyncStatusHelper getInstance() {
     if (sInstance == null) {
@@ -33,7 +33,7 @@ public class FxAccountSyncStatusHelper implements SyncStatusObserver {
   }
 
   // Used to unregister this as a listener.
-  protected Object handle;
+  protected Object handle = null;
 
   // Maps delegates to whether their underlying Android account was syncing the
   // last time we observed a status change.
diff --git a/mobile/android/base/fxa/tasks/FxAccountSetupTask.java b/mobile/android/base/fxa/tasks/FxAccountSetupTask.java
index aa2b5324dab8..4ef71de60729 100644
--- a/mobile/android/base/fxa/tasks/FxAccountSetupTask.java
+++ b/mobile/android/base/fxa/tasks/FxAccountSetupTask.java
@@ -85,9 +85,9 @@ public abstract class FxAccountSetupTask<T> extends AsyncTask<Void, Void, InnerR
 
   protected static class InnerRequestDelegate<T> implements RequestDelegate<T> {
     protected final CountDownLatch latch;
-    public T response;
-    public Exception exception;
-    public FxAccountClientRemoteException failure;
+    public T response = null;
+    public Exception exception = null;
+    public FxAccountClientRemoteException failure = null;
 
     protected InnerRequestDelegate(CountDownLatch latch) {
       this.latch = latch;