I want to return a list of strings when I call the method generateArrayList(2); It reminds me “Method does not exist or incorrect signature: void generateArrayList(Integer) from the type anon” Anyone help me, please! here is my class: Answer You have few compile time errors which needs to be corre…
When building containers why is using Java Generics better than using the Object Class? (Java Generics & DataStructures)
So I have been reviewing my data structures and came across an interesting thought regarding Java generics and the Object class. I have implemented and run a “generic bag” in two different ways (Notice below: IObjectBag.java, ObjectBag.java, IGenericBag.java, and GenericBag.java) and have used the…
Gradle migration 3.1.4 -> 3.5.1; :app module doesn’t compile; ClassNotFoundException: Didn’t find class on path: DexPathList
I have two applications where I face the same issue while trying to update project target API from 27 to 29. To do this, first I need to update Gradle plugin at least to 3.2.+. Project is building fine with 3.1.4, but as soon as I rise Gradle plugin to: classpath ‘com.android.tools.build:gradle:3.5.1 di…
Connection Pool and thread pool setting in Java
Spring application using Hikari pool. Now for a single request from the client I have to query 10 tables(business required), and then composite the result together. And querying for each table may cost 50ms to 200ms. To speed up the response time, I create a FixedThreadPool in my service to query each table i…
How to create delete function with jsp and mysql
im trying to a create a course table with crud function. So this is a simple page i want to create with the following function Create Course Edit Course 3.Delete Cou Update Course Answer the above has been resolved by change the input parameter
Running Jenkins Node/Agent as a Windows Service with OpenJDK
I have a Windows virtual machine with OpenJDK 13 installed that I would like to setup as a Jenkins node/agent. When I create the node configuration using the Jenkins UI and select Launch Method: Launch Agent by connecting it to the master it provides a link to download slave-agent.jnlp On a system with the or…
the method withtimeout(duration) in the type fluentwait is not applicable for the arguments (int, timeunit)
An error appear while working with this code the error is “The method withTimeout(Duration) in the type FluentWait is not applicable for the arguments (int, TimeUnit)” Answer This is the correct usage now..
Creating a new window on button click – Vaadin14
I want to create a new Window using: final Window window = new Window(“Window”); this.getUI().addWindow(window); This is from the Vaadin homepage https://demo.vaadin.com/sampler/#ui/structure/window …
Can’t connect to Oracle 19.3 with 19.3 JDBC driver
We have a project running with an Oracle 19.3 database, and a Java application using the Oracle 19.3 JDBC driver (which is available on Maven Central). On Windows with JRE 1.8, everything is fine, but when I run either on our build server or in WSL Ubuntu with OpenJDK 11.0.3 it refuses to connect to the datab…
Read file extended attributes of files on SFTP server with JSch
I want to read file extended attributes using com.jcraft.JSch 0.1.55 (the file is on SFTP server). I know that class SftpATTR actually does have a method but in my case it returns null. I see that in this code the last if-statement is responsible for reading extended attributes but it seems to me that it alwa…