Java – Error occurred during initialization of boot layer

eclipsejavajava-module

I followed the steps to create the HelloWorld example but it doesn't run. It gives the following error:

Error occurred during initialization of boot layer
java.lang.module.FindException: Error reading module:
F:\Develop\eclipse\HelloWorld\bin Caused by:
java.lang.module.InvalidModuleDescriptorException: HelloWorld.class
found in top-level directory (unnamed package not allowed in module)"

Please advise how to solve this.

Best Answer

The error occurs because of you add your jar library files to MODULEPATH instead of CLASSPATH. You have to add jar files to your CLASSPATH. If you already add jar files to MODLEPATH you have to remove from there and add jar files to CLASSPATH, there is the steps:

1] Right click on your project name in ECLIPSE IDE

2] Click on PROPERTIES -> JAVA BUILD PATH -> click LIBRARY tab .The you get the window like this:

3] Expand MODULEPATH and select all jar files and remove it :look the picture below:

4] After that click on CLASSPATH ->and click the button 'ADDJAR' and select the jar files ,your are done. Look the picture below for clarification;

5] After adding jars files in CLASSPATH it looks like this:

Related Solutions

Java – Initialization of an ArrayList in one line

It would be simpler if you were to just declare it as a List - does it have to be an ArrayList?

List<String> places = Arrays.asList("Buenos Aires", "Córdoba", "La Plata");

Or if you have only one element:

List<String> places = Collections.singletonList("Buenos Aires");

This would mean that places is immutable (trying to change it will cause an UnsupportedOperationException exception to be thrown).

To make a mutable list that is a concrete ArrayList you can create an ArrayList from the immutable list:

ArrayList<String> places = new ArrayList<>(Arrays.asList("Buenos Aires", "Córdoba", "La Plata"));

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

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.

Best Answer

Related Solutions

Java – Initialization of an ArrayList in one line

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

Related Topic