title: unable to find class referenced in signature (Lorg/shaded/apache/log4j/Logger;) after upgrading Firebase for Android
body: <p>When I save into Firebase data storage, I am getting the following errors but the email and password registration is fine in the login&amp;auth section. I am using Java, Android. I already spent 3 hours but cannot fix problems (Maybe the new firebase android update?).</p>
  
  <p>Here is proof that email/pass is working:</p>
  
  <pre><code>            Firebase f = new Firebase("https://myapp.firebaseio.com/"); 
              Firebase userData = f.child("User");
              //save into login&amp;auth of email and password SUCCESS
              userData.createUser(emailAddr.getText().toString(), passwd.getText().toString(), new Firebase.ValueResultHandler&lt;Map&lt;String, Object&gt;&gt;() {
                  @Override
                  public void onSuccess(Map&lt;String, Object&gt; result) {
                      System.out.println("Successfully created user account with uid: " + result.get("uid"));
                  }
                  @Override
                  public void onError(FirebaseError firebaseError) {
                      // there was an error
                  }
              });
  
              Firebase set_user = userData.push();
              String user_id = set_user.getKey();
              //save into database FAILED
              Map&lt;String, Object&gt; save_user = new HashMap&lt;String, Object&gt;();
              save_user.put("disp_name", dispName.getText().toString());
              save_user.put("real_name", rl_name.getText().toString());
              save_user.put("email_addr", emailAddr.getText().toString());
              save_user.put("user_pwd", passwd.getText().toString());
              save_user.put("id",user_id);
              set_user.setValue(save_user);
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/ykhFG.png" alt="enter image description here"></p>
  
  <p>The following are errors I get from running the code above.</p>
  
  <blockquote>
    <p>VFY: unable to find class referenced in signature (Lorg/shaded/apache/log4j/Logger;)</p>
  </blockquote>
  
  <p>and</p>
  
  <blockquote>
    <p>VFY: unable to resolve virtual method 26177: Lorg/shaded/apache/log4j/Category;.log (Ljava/lang/String;Lorg/shaded/apache/log4j/Priority;Ljava/lang/Object;Ljava/lang/Throwable;)V</p>
  </blockquote>
  
  <p>and </p>
  
  <blockquote>
    <p>Could not find method org.shaded.apache.log4j.Category.log, referenced from method org.shaded.apache.commons.logging.impl.Log4JLogger.trace</p>
  </blockquote>
  
  <p>and</p>
  
  <blockquote>
    <p>VFY: unable to resolve static field 9561 (WARN) in Lorg/shaded/apache/log4j/Priority;</p>
  </blockquote>