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 Error "JDK is missing" | Java 
посмотрели 860 раз
обновлено: 12 September 2026
I run IntelliJ IDEA, open the project and see an error:
JDK "openjdk-22" is missing"
 
Decision!
Step 1. I download and install the JDK...
 
Step 2. I run IntelliJ IDEA and press Add JDK and select the set path C:\Program Files\Java\jdk23 and press OK
 
Now everything is fine
 
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Download and install IntelliJ IDEA to explore Java, Spring, Jakarta EE | Functionality and differences: Community | Ultimate
 
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Create a simple console app in IntelliJ IDEA to learn Java
 
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Download and install
• Installation JDK (download and install the Java library for Windows)
• Download and install IntelliJ IDEA to explore Java, Spring, Jakarta EE | Functionality and differences: Community | Ultimate
• Error "JDK is missing" | Java
Java (class, interface, collections, etc.)
• Create a simple console app in IntelliJ IDEA to learn Java
• Access modifiers (private, protected, public) for a class and for methods and fields. | Java
• Collections in Java
• interface List<E> in Java
• class ArrayList<E> in Java
• class Vector<E> in Java
• class Stack<E> in Java
• class CopyOnWriteArrayList<E> in Java
• interface Queue<E> in Java
• interface Deque<E> in Java
• class LinkedList<E> in Java
• interface Set in Java
• class HashSet<E> in Java
• class LinkedHashSet<E> in Java
• Collections.singletonList("Hello") returns an immutable list containing exactly one specified element | Java collection
• class Collections (all functions, algorithms) | Java
• stream.filter(...) select elements according to your criterion | Java collection | Example: allCars.stream().filter(item -> item.Price < 30000).toList()
• What is interface in Java ?
• Directly in the code (at runtime) we make an implementation for the interface | Java
• Threads in Java
• lambda is an unnamed method (no name and no class owned) | Java
• Exceptions and handling in Java. Example: try {...} catch (Exception e) {...}
• Why use throws Exception in the function name in Java? Answer: The method throws an exception and there is no handling of try catch. Example: float CalculateDensity(float mass, float volume) throws Exception { ... throw new Exception("Error! Volume is zero."); ... }
Java web application (servlet, jsp page, basic functionality and no frameworks)
• Creating a new simple web application (jsp web page) | Java, Maven
• Create a web servlet (the servlet is located on the web server, returns the result on request) | Java
• Installation Tomcat web server (download and install for Windows)
• Check, test Tomcat web server (create a new my.hml file)
• What is Maven
• What is a dynamic web page jsp (Java Server Page) ?
• How to install Smart Tomcat plugin in Intellij Idea
• Error "The SDK is not specified for module ... | Project SDK is not defined ..." in IntelliJ IDEA | Java
Spring in Java (Spring Framework, Spring Data, Spring Boot, ...)
• What is Spring? Why use Spring in Java?
• What is Spring Bean? What is Spring Container? IoC (inversion of control) | Creating a simple Spring project and configuration Spring Container in an XML file | Editor IntelliJ Idea and language Java
• What is Dependency Injection in Spring? Creating a simple Spring project with Dependency Injection in the constructor with the attributes @Component, @Autowired | Editor IntelliJ Idea and language Java
• Create a new Spring Web application (the request goes to the Controller → Controller creates a response as text or json) | Java, Spring Web, Spring Boot, Maven
• Creating a new Spring WebSocket application (Java WebSocket sends a message to the JavaScript WebSocket) | Java, Spring WebSocket, Spring Boot, Maven
• Create Azure Web App with the type Java (free). That is, create an empty web server
• Put the Java Spring web application in Azure
• Connect to the application Azure Web App (Java) via FTP | use File Explorer
• Error "The SDK is not specified for module ... | Project SDK is not defined ..." in IntelliJ IDEA | Java, Spring Boot
• How to install Spring WebSocket plugin in Intellij Idea
Jakarta EE / Java EE in Java (Web Applications, Web Services)
• What is Jakarta EE (Java EE)? | In which editor (program) is it convenient to write Jakarta EE (Java EE) code?
• Creating a simple web project in IntelliJ Idea Ultimate | Jakarta EE (Java EE)
Struts in Java (extends API Java Servlet using MVC)
• What is Struts | Java
Courses, training
• Course "Java developer" from Yandex
Interview
• Interviews on Java

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