Below code finds the first document in a collection : There does not appear to be a findAll method. How to find all the documents in the collection testCollection ? Answer You have to use the DBCollection.find() method, which Select all documents in collection and get a cursor to the selected documents. So, w…
Java SWT make a Label Scrollable
I have a Label in a Group in SWT and if it contains many lines of text, I would like to make it scrollable vertically. Setting the style parameter with SWT.V_SCROLL doesn’t seem to do it. How can I do this? Answer Label does not support scrolling. You could use a read only Text control which will scroll…
Hashmap with Streams in Java 8 Streams to collect value of Map
Let consider a hashmap I inserted some values into both hashmap. For Example, Q1) Now I want to apply a filter condition on the key in hashmap and retrieve the corresponding value(List). Eg: Here My query is key=1, and output should be ‘list1’ I wrote But I don’t know how to retrieve as a li…
Fibonacci calculator with BigIntegers
I’m working on a homework project where I must have the user input a number, and the computer spits out the Fibonacci numbers up to that one. I’d normally be able to do this, with int values, except that for this program, I need to use the BigInteger type instead, because int, long, double, etc. t…
Mockito NotaMockException
I am facing an issue with Mockito junit testing. I am new to it and am a bit confused with the problem I am facing. Any help on this would be appreciated. Getting exception : in the below code I am aware that activity is not a mock but I am not sure for a way around this as secondMethod()
How can I set the compileOptions for my Gradle Java plugin?
I want to set the -parameters command on my gradle build so that I can use reflection to access the name of the parameters. It seems like I should be doing this with the following closure. But compileOptions is listed as read-only, and when I look at the source code there’s no setter. https://gradle.org…
mock instance is null after @Mock annotation
I try to run this test: but I get NullPointerException for: Mockito.when(routingClientMock. what am i missing? Answer When you want to use the @Mock annotation you should use the MockitoJUnitRunner See also this tutorial.
What’s the recommended way to set networkaddress.cache.ttl in Elastic Beanstalk?
I need to set Java’s DNS cache TTL (networkaddress.cache.ttl) for an Amazon Elastic Beanstalk app running in Tomcat 8. Because EB can start and stop server instances at any time, I can’t simply edit a Tomcat config file and the server and expect the change to persist. I tried setting the networkad…
SpringBoot with Thymeleaf – css not found
First to say is that I’ve been searching for a solution for a while now and I’m quite desperate now. I cannot get the css file to be accessible from html page when run by Spring Boot. html.file Application.java folder structure: I’ve tried putting the css folder into a static folder and/or r…
Hadoop 2.6.0 Browsing filesystem Java
I have installed a basic hadoop cluster on CentOS 6.6 and want to write a few basic programs (browse the filesystem, delete/add files, etc) but I’m struggling to get even the most basic app working. When running some basic code to list the contents of a directory to the console I get the following error…