Java Questions

How to Fix JUnit Invalid test class Error Exception Trace org.junit.runners.model.InvalidTestClassError: Invalid test class ‘com.testingdocs.tutorials.TestCaseOne’: 1. The class com.testingdocs.tutorials.TestCaseOne is not public. 2. Test class should have exactly one public constructor at org.junit.runners.ParentRunner.validate(ParentRunner.java:525) at org.junit.runners.ParentRunner.<init>(ParentRunner.java:102) at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:84) at org.junit.runners.JUnit4.<init>(JUnit4.java:23)   The error message suggests that your JUnit test class has incorrect visibility or constructor issues. […]

Fix ORA-01017: invalid username/password Error Let’s fix ORA-01017: invalid username/password; logon denied error while connecting to Oracle database from JDBC program. Error trace Exception in thread “main” java.sql.SQLException: ORA-01017: invalid username/password; logon denied   Fix Check user credentials The error is generic and there could multiple causes for the error. First things first, cross check […]

Fix ORA-12514 TNS: listener Service Error : In this post, we will resolve and fix the following Oracle JDBC Thin Driver error. ORA-12514

What is a Nested Interface in Java? This blog will help you understand what nested interfaces are, why they’re useful, and how they differ from nested classes. Nested Interface A nested interface is an interface that is declared inside another class or interface. It is a static interface by default. Nested interfaces can be accessed […]

There are many new annotations supported by Junit 5. We can find the annotations under the Jupiter package org.junit.jupiter.api JUnit 5 Annotations Some of the annotationsin JUnit 5 are as follows: •@BeforeAll •@AfterAll •@BeforeEach •@AfterEach •@Disabled Sample Listing with the lifecycle annotations in the JUnit 5 Java Listing package test; import org.junit.jupiter.api.AfterAll; import org.junit.jupiter.api.AfterEach; import […]