must declare a named package eclipse because this compilation unit is associated to the named module

Question

I just downloaded eclipse for Java Yesterday but when I was trying to get make my first program  I kept on getting this error    must declare a named package eclipse because this compilation unit is associated to the named module x     How do I fix this

User · Answer

The  delete module-info java at your Project Explorer tab  answer is the easiest and most straightforward answer  but  for those who would want a little more understanding or control of what s happening  the following alternate methods may be desirable    make an ever so slightly more realistic application  com YourCompany etc or just com HelloWorld  Project name  com HelloWorld and class name  HelloWorld    or   when creating the java project  when in the Create Java Project dialog  don t choose Finish but Next  and deselect Create module-info java file

User · Answer

Just delete module-info java at your Project Explorer tab

User · Answer

Reason of the error  Package name left blank while creating a class  This make use of default package  Thus causes this error  Quick fix   Create a package eg  helloWorld inside the src folder  Move helloWorld java file in that package  Just drag and drop on the package  Error should disappear   Explanation   My Eclipse version  2020-09  4 17 0  My Java version  Java 15  2020-09-15  Latest version of Eclipse required java11 or above  The module feature is introduced in java9 and onward  It was proposed in 2005 for Java7 but later suspended  Java is object oriented based  And module is the moduler approach which can be seen in language like C  It was harder to implement it  due to which it took long time for the release  Source  Understanding Java 9 Modules When you create a new project in Eclipse then by default module feature is selected  And in Eclipse-2020-09-R  a pop-up appears which ask for creation of module-info java file  If you select don t create then module-info java will not create and your project will free from this issue  Best practice is while crating project  after giving project name  Click on next button instead of finish  On next page at the bottom it ask for creation of module-info java file  Select or deselect as per need  If selected   by default  click on finish button and give name for module  Now while creating a class don t forget to give package name  Whenever you create a class just give package name  Any name  just don t left it blank  If deselect  No issue

[java] must declare a named package eclipse because this compilation unit is associated to the named module

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