Baur & King said in their book: Implicit joins are always directed along many-to-one or one-to-one association, never through a collection-valued association. [P 646, Ch 14] But when I am doing that in the code it is generating a CROSS JOIN instead of an INNER JOIN. Mapping is from Member2 (many-to-one) -…
How to exclude older versions of maven dependency and use new version of it?
I am working with Maven project and I have two projects, ProjectA and ProjectB. My ProjectA is a maven library whose pom looks like this: In my above pom, PartialKernel is bringing older version of various Spring Framework dependencies like spring-core, spring-web. It is bringing 3.2.8.RELEASE version and I w…
Change deferredResult HTTP status code on timeout
I am using deferredResult on Spring MVC, but using this code, the timeout still are sending back the HTTP code 503 to the client. Any idea what else to try? Answer I ran into the same issue. My Spring MVC Controller method originally returned DeferredResult<Object>, but then I realised I wanted to contr…
Determining whether a particular JDK Method typically has an intrinsic implementation
Short of the reading the OpenJDK source code (which I’m not averse to) is there a reasonably comprehensive (or ‘official’) list of intrinsic operations within the Hotspot JVM (say for Intel)? For example, what’s the quickest way to determine whether Math.abs() will generally be convert…
How to chose a random point at a certain distance to a reference point
I have point A (pointA = (x1, y1)) and I need to choose a random point B (pointB = (x2, y2)) such that the distance between the A and B is equal to K. Answer Let’s solve in polar form. We’ll need these doubles distance, x1, and y1. First, we want the angle in radians: Then we want to get
Java – WebView What event handles (watches) URL changes – Android
The app does a login to a web application using WebView. Once in the webview, the webview appears to handle everything for you as it should based on the user’s clicks. However I need to review on each event if the URL changes to a specific logout URL. How can I return the user to the app itself when the
TreeSet constructor with Comparator parameter
In Java’s documentation for its class TreeSet one of the constructors is shown to have the following header: Can someone help explain why there is a constructor for TreeSet which takes a comparator object as its argument? I have no clue why this is done. Answer The elements in a TreeSet are kept sorted. If yo…
Change Color of JTable Row Based on the Value of the Database
}; This is my New Codes im trying to get the value of column 4 and equal it to single if its true the background is change. but this is not working Answer Overriding the prepareRender(…) method of the JTable allows your to customize rendering for the entire row based on a value in one of the columns. Th…
How to write an Aspect pointcut based on an annotated parameter
I’m having a bit of trouble working out how to create a pointcut that will operate on beans that have a specific annotated parameter. My eventual aim is to validate the value of the parameter before it’s processed, but for the moment I just need to create the pointcut. Consider the following annot…
In the knights tour challenge, from the coordinates the player is currently on to show the user where they can move
This is from my attempt at the knights tour game, and what I was trying to do here was show the user what moves they could make from whatever position they are in, in the array. The problem arrives with NextPos[x+1][y-2]!=null in the if statement, as the exception java.lang.ArrayIndexOutOfBoundsException: -2 …