does GWT Action process data in a form of “first come first serve” or parallelly?

Ok, I have just realized this issue.

Let say you use GWT + Java + Tomcat to build your web App.

The Tomcat receives 2 Action calls from 2 clients at the same time.

The 1st call (will call a series of methods & return a boolean) is received by the server before the 2nd.

Call1:

String passwordProvidedByUser=action.getPasswordFromClient();  String passwordFromDB=data.getPasswordFromDB();  if (passwordFromDB.equals(passwordProvidedByUser)){        boolean updated=data.updateInfo();  }

Call 2:

 String newPassword=action.getPasswordFromClient();  boolean changePwd=data.changePwd(newPassword);

So, if Call1 finished String passwordFromDB=data.getPasswordFromDB(); but has not run the boolean updated=data.updateInfo(); while call 2 already ran boolean changePwd=data.changePwd(newPassword); then call 1 boolean updated=data.updateInfo(); with old password?

My question is that will GWT finish all the actions of 1st call & return the result to the 1st call before it starts to process the 2nd?

Or It just starts to process the 2nd while it is still processing the 1st (ie the server hasn't return a result to the 1st, but already started to process the 2nd)?

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