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Half of the problem is solved when you are able to reproduce it.įor our purpose we will use following HelloWorld program for our testing, interestingly I have named it HelloHP and it resides in a package called "dto". This is one of the most important troubleshooting skill which will help you a long way in your career. In order to understand the problem little better, let's reproduce it. You need to build this skill by doing active development.
#Cant load rjava windows 10 how to
Unfortunately beginner's book like Head First Java, which many developers used to learn Java, doesn't teach you how to deal with this kind of errors. Solving Error: Could not find or load main class HelloWorld It's Java class loader who looked into CLASSPATH for loading classes.Ĭoming back to the problem in hand, if you are a beginner in Java, who are able to run the program from Eclipse but getting "Error: Could not find or load main class HelloWorld" when trying to run the same program from the command line then follow the steps given here to solve it.
![cant load rjava windows 10 cant load rjava windows 10](https://static.tp-link.com/image-20210616154846-6_1623829860131e.jpeg)
While, CLASSPATH is used to locate the class file or JAR files. It is also used to locate native libraries used by your Java program. This way you always know which JARs are included in your classpath.įor beginners, another important thing to understand is the difference between PATH and CLASSPATH, you must know that PATH is used locate system executable, commands or. Instead, I use -cp or -classpath option with java command to run my program. Personally, I don't like this environment variable and doesn't define in my environment variable, because its confusing and source of so many classpath related issue. In Eclipse, it's easy to compile and run the program because Eclipse takes care of all Classpath setup, but when you run your Java program from command line, CLASSPATH environment variable comes in picture. Since many Java programmer is now started programming using Eclipse they face this issue when they first try to run their Java program from command line. For now, you just remember that there is an environment variable called CLASSPATH which includes directories where Java looks for all class files and if it doesn't find your main class there then it throws "Error: Could not find or load main class XXX", where XXX is the name of your main class. For the curious reader, I would suggest reading my post How Classpath works in Java, a must read for a beginner. In order to solve this error, you must know how Java find and loads the classes, that's a little bit complex topic for beginners, but we will touch the same base here. Make sure that the class name and file name are the same.Error: Could not find or load main class HelloWorld comes when you are trying to run your Java program using java command with the main class as HelloWorld but Java is not able to find the class.
![cant load rjava windows 10 cant load rjava windows 10](https://static.javatpoint.com/core/images/java-does-not-open5.png)
Now write the first Java program as shown below, save the program as HelloWorld.java and exit the editor. In this step, we will write, compile, and execute our first program in Java using the standard Hello World example.
#Cant load rjava windows 10 download
It will show the JDK download page as shown in Fig 1. Open the browser and search for Download JDK 17 or click the link to download from the Oracle website.
#Cant load rjava windows 10 install
You may also follow the How To Install OpenJDK 17 On Ubuntu to install the latest OpenJDK on Ubuntu and How To Install Java 17 On Ubuntu to install Oracle JDK. You may also install the popular IDEs to develop Java applications by following - How To Install Eclipse For Java On Windows, How To Install IntelliJ IDEA for Java on Windows, How To Install NetBeans On Windows, and How To Install VSCode For Java On Windows. The premier support will be available till September 2026 and extended support will be available till September 2029.
![cant load rjava windows 10 cant load rjava windows 10](https://i.stack.imgur.com/pBduB.png)
The Java 17 is an LTS version which means there will be long-time support from Oracle for the same.
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Java 17 is using the Commercial License and OpenJDK 17 is using the open-source GNU General Public License v2, with the Classpath Exception (GPLv2+CPE). You can also, follow How To Install OpenJDK 17 On Windows to install the open-source version of Java 17 i.e.
#Cant load rjava windows 10 free
We can use Java 17 free for general-purpose computing usage.
![cant load rjava windows 10 cant load rjava windows 10](https://i.stack.imgur.com/gVwF2.png)
It can be installed separately if required. Notes: The official installer provided by Oracle does not include the bundled JRE with JDK since Java 11. The steps should be the same for other versions of the Windows operating system. It provides the steps required to install Oracle JDK 17 on Windows 10. This tutorial provides all the steps required to install the Oracle Java 17 officially distributed by Oracle for Windows.