Could Not Find The Main Class Error
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Java Could Not Find The Main Class
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Error Could Not Load Or Find Main Class
a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up What does “Could not find or load main class” mean? up vote 365 down could not find or load main class error in java cmd vote favorite 124 A common problem that new Java developers experience is that their programs fail to run with the error message: Could not find or load main class ... What does this mean, what causes it, and how should you fix it? java class main share|improve this question edited May 18 '14 at 17:34 gturri 4,73951937 asked Aug 7 '13 at 3:02 Stephen C 386k44409736 4 Please note could not find or load main class files that this is a "self-answer" question that is intended to be a generic reference Q&A for new Java users. I could not find an existing Q&A that covers this adequately (IMO). –Stephen C Aug 7 '13 at 3:21 this happened to me recently and it was due to a broken referenced library. I added an answer just in case it happens to someone else. –Eduardo Dennis Nov 1 '13 at 18:05 link <-- do you mind helping me? I tried debugging but to no avail. –Linify Jul 16 '14 at 3:45 2 Is your class under a package? if yes, see my answer –Razavi Oct 27 '14 at 12:09 2 In my case the answer was to add -jar –Nakilon Dec 15 '14 at 11:48 | show 1 more comment 24 Answers 24 active oldest votes up vote 396 down vote accepted The java
or load main class in Java [Solved] 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
Could Not Find The Main Class Jar
to find the class. In order to solve this error, you must know how could not find the main class aclauncher Java find and loads the classes, that's a little bit complex topic for beginners, but we will touch the same base here.
Could Not Find The Main Class Net.minecraft.client.minecraft. Program Will Exit
For the curious reader, I would suggest reading my post How Classpath works in Java, a must read for a beginner. For now, you just remember that there is an environment variable called CLASSPATH which includes http://stackoverflow.com/questions/18093928/what-does-could-not-find-or-load-main-class-mean 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. 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. In Eclipse, it's easy to compile and run http://javarevisited.blogspot.com/2015/04/error-could-not-find-or-load-main-class-helloworld-java.html 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. 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. Instead, I use -cp or -classpath option with java command to run my program. This way you always know which JARs are included in your classpath. For 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 .exe, .dll files (in Windows) and .so files (in Linux). It is also used to locate native libraries used by your Java program. While, CLASSPATH is used to locate the class file or JAR files. It's Java class loader who looked into CLASSPATH for loading classes. Coming 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. Solving Error: Could not find or load main class HelloWorld Unfo
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