I wrote a Junit test to unit test my code. I want my Junit test case to fail when I get any exception in my code. I tried using an assert statement, but even when I get an exception in my code, my Junit test case is passing. Please can anyone tell me how I can achieve this? Thanks. Answer
Getting rid of FindBugs “Random object created and used only once” when Random is created in the constructor
I want to get rid of the FindBugs warning “DMI: Random object created and used only once”. In the following example, the random number is generated only once upon the object construction. In other terms, for the lifecycle of a single instance of the class Wrap, no other instances of java.util.Rand…
ListFragment Not displaying data from List
After I try to open the navigation drawer and go to a different tab and then go back to it. It is not showing data in a list once again. Main Activity UniverseListing Glimpse List Fragment Answer You create an Activity instance that isn’t managed by the Android life cycle, so the Arraylist that you want…
java.net.ConnectException: fail to connect to localhost/127.0.0.1(port 8080): connect failed:ECONNREFUSED….(Codename One App)
After building an android application, I scanned the generated QRcode and install the application on galaxy s4 successfully. But when I try to do some search using the app I got the following exception: Please check the attached picture for more clarity. The app works correctly on the simulator. I OFF the fir…
Difference between System.getProperty(“line.separator”); and “n”?
While developing GUI with Java FX, I seem to get different results with System.getProperty(“line.separator”); and “n” during writing to a file or getting data from internet. What basically is the difference? Answer System.getProperty(“line.separator”) returns the OS depende…
How to apply Spring Security filter only on secured endpoints?
I have the following Spring Security configuration: The authenticationTokenFilterBean() is applied even on endpoints that do not match /api/** expression. I also tried adding the following configuration code: but this still did not solve my problem. How can I tell Spring Security to apply filters only on endp…
Buetooth connection failed: read failed, socket might closed or timeout, read ret: -1
I am trying to create a Bluetooth connection. I can search for nearby devices but when I try to connect I get an error I do not understand: LOGCAT I Have two classes for connect, one that receives the device and execute the connection, an other for make connection. ConexionActivity.Java ConnectThread.java Imp…
Maven build fails ONLY when run with jenkins
I have a Java project that is committed to GitHub. The project consists of 3 modules. I have configured the Jenkins Workflow Multibranch Pipeline plugin to build the 3 modules. Maven builds the first 2 modules with no problem. But on the third module I get the following error: I have red that there may be a p…
Map getOrDefault VS getOrUseSupplier
I am starting to learn lambdas and i do not understand why java Map has: and not(working just the same, but if value is absent, then defaultValue will be taken from supplier): Adventages i currently see of current solution: defaultValue does not have to be a final/effectively final value looks simpler & n…
Are there any tools to create dummy objects to use for JUnit test cases?
I am writing JUnit test cases to test CRUD operations in DAO classes. It is pretty much boilerplate code and bulk of it is to create the test object and assign dummy values to the instance variables. Are there any tools in Java to create an object and assign dummy values based on the declared type? I don̵…