Error occurred during initialization of boot layer FindException: Module not found

Question

Executing a simple "Hello World" program using Java 9 results in the following error message:

Error occurred during initialization of boot layer
java.lang.module.FindException: Module com.pantech.myModule not found

The command line that I executed was:

java --module-path bin -m com.pantech.myModule/com.pantech.myModule.HelloWorld

This command line is executed from the parent directory of my bin directory that contains all of the .class bytecode files.

The module-info.class file is located in the com.pantech.myModule directory that is located in the bin directory. The HelloWorld.class file contains the main method and is located in the package directory within the com.pantech.myModule directory. Therefore, the pathname of the HelloWorld.class file is bin\com.pantech.myModule\com\pantech\myModule\HelloWorld.class.

The HelloWorld class is in the com.pantech.myModule package (package name same as the module name).

I am using Windows 10 as the Operating System. From everything that I have read, the above command line should be correct. Any suggestions on how to fix this?

Solution 1

The reason behind this is that meanwhile creating your own class, you had also accepted to create a default class as prescribed by your IDE and after writing your code in your own class, you are getting such an error. In order to eliminate this, go to the PROJECT folder → src → Default package. Keep only one class (in which you had written code) and delete others.

After that, run your program and it will definitely run without any error.

Solution 2

I had the same issue while executing my selenium tests and I removed the selenium dependencies from the ModulePath to ClassPath under Build path in eclipse and it worked!

Solution 3

I had similar issue, the problem I faced was I added the selenium-server-standalone-3.141.59.jar under modulepath instead it should be under classpath

so select classpath via (project -> Properties -> Java Bbuild Path -> Libraries) add the downloaded latest jar

After adding it must be something like this

And appropriate driver for browser has to be downloaded for me i checked and downloaded the same version of chrom for chrome driver and added in the C:\Program Files\Java

And following is the code that worked fine for me

public class TestuiAautomation {

    public static void main(String[] args) {

        System.out.println("Jai Ganesha");
        try {
            System.setProperty("webdriver.chrome.driver", "C:\\Program Files\\Java\\chromedriver.exe");
            System.out.println(System.getProperty("webdriver.chrome.driver"));
            ChromeOptions chromeOptions = new ChromeOptions();
            chromeOptions.addArguments("no-sandbox");
            chromeOptions.addArguments("--test-type");
            chromeOptions.addArguments("disable-extensions");
            chromeOptions.addArguments("--start-maximized");
            WebDriver driver = new ChromeDriver(chromeOptions);
            driver.get("https://www.google.com");
            System.out.println("Google is selected");
        } catch (Exception e) {
            System.err.println(e);
        }

    }
}

Solution 4

You say that your module-info.java contains

module myModule {}

That means it declares a module called myModule, not com.pantech.myModule. Pointing this from the command format:

 -m <module-name>/<main-class>

Solution 5

I had the same issue and I fixed it this way:

1. Deleted all projects from eclipse, not from the computer.
2. Created a new project and as soon as you write the name of your project, you get another window, in which is written: "Create module-info.java". I just clicked "don't create".
3. Created a package. Let us call the package mywork.
4. Created a Java class inside the package myWork. Let us call the class HelloWorld.
5. I run the file normally and it was working fine.

Note: First, make sure that Java is running properly using the CMD command in that way you will understand the problem is on eclipse and not on JDK.

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Comments

[ernest_k]

In which directory is the compiled module file? Seems like the directory you need to add to module path is bin\com.pantech.myModule

[D. Pante]

The compiled module file (module-info.class) is located in the bin\com.pantech.myModule directory.

[Naman]

Could you share the class definition(starting from package declaration) and module definition as well, for the above to be reproduced, please? And honestly, for such experiments, I take the quick-start here for reference. (you might want to cross verify the compilation commands as well)

[D. Pante]

Module definition file (module-info.java) located incom.pantech.myModule directory contains the following: module myModule {} The source code for the HelloWorld file contains the following: package com.pantech.myModule; public class HelloWorld { public static void main(String [] args) { System.out.println("Hello World from module"); } }

[Naman]

@D.Pante The answer by tretegfdg seems to be pointing out the mistake you made. That's why I suggest referring to the guide as well. The module name there is same as the package name com.greetings(in the sample), hence their command works. Also, refer to docs.oracle.com/javase/9/tools/java.htm for more details on the commands used.

[SedJ601]

In Netbeans, I just used Clean and Rebuild Project and it worked.

[D. Pante]

Thanks. The problem was solved by changing the module name in the module-info.java file to com.pantech.myModule instead of just myModule. The solution should have been obvious to me, but I guess that I was looking for something more obscure.

[Bhaumik Bhatt]

Tries Same thing but it does not resolve the error

[Bhaumik Bhatt]

Can you please explain? I am still not able to figure out what changes i am supposed to make.

[bunkinet]

I faced the same issues and this fixed it