This compilation unit is not on the build path of a Java project

Question

When I try to use ctrl space this error is shown    This compilation unit is not on the build path of a Java project    I see that there are similar topics but my work environment is Eclipse and i pull my project from Git  I import project as general project  and i use Apache Ant  Can anyone help me

User · Answer

In my case  I have Eclipse Maven project   I had the same issue and I posted detailed explanation of the issue and answer here Eclipse Maven - Code Completion fails  quot This compilation unit is not on the build path of a Java project quot  and  quot Failed to Download Index quot  Error

User · Answer

If it is a Maven project then sometimes re-importing of it helps    Right-click the project in the Project Explorer and choose Delete  File   Import      Maven   Existing Maven Projects   Next   Root Directory   Browse your project from Disk    Hope it will resolve the issue

User · Answer

For those who still have problems after attempting the suggestions above  I solved the issue by updating the maven project

User · Answer

Go to Project-  right Click-  Select Properties -  project Facets -  modify the java version for your JDK version you are using

User · Answer

Add this to  project file    lt  xml version  1 0  encoding  UTF-8   gt           lt projectDescription gt               lt name gt framework lt  name gt               lt comment gt  lt  comment gt               lt projects gt               lt  projects gt               lt buildSpec gt                   lt buildCommand gt                       lt name gt org eclipse wst common project facet core builder lt  name gt                       lt arguments gt                       lt  arguments gt                   lt  buildCommand gt                   lt buildCommand gt                       lt name gt org eclipse jdt core javabuilder lt  name gt                       lt arguments gt                       lt  arguments gt                   lt  buildCommand gt                   lt buildCommand gt                       lt name gt org eclipse m2e core maven2Builder lt  name gt                       lt arguments gt                       lt  arguments gt                   lt  buildCommand gt                   lt buildCommand gt                       lt name gt org eclipse wst validation validationbuilder lt  name gt                       lt arguments gt                       lt  arguments gt                   lt  buildCommand gt               lt  buildSpec gt               lt natures gt                   lt nature gt org eclipse jem workbench JavaEMFNature lt  nature gt                   lt nature gt org eclipse wst common modulecore ModuleCoreNature lt  nature gt                   lt nature gt org eclipse jdt core javanature lt  nature gt                   lt nature gt org eclipse m2e core maven2Nature lt  nature gt                   lt nature gt org eclipse wst common project facet core nature lt  nature gt               lt  natures gt           lt  projectDescription gt

User · Answer

If your project is imported as an existing maven project then -- gt  Just right click on project and do maven update  It resolved my similar issue

User · Answer

Since you imported the project as a General Project  it does not have the java nature and that is the problem   Add the below lines in the  project file of your workspace and refresh    lt natures gt         lt nature gt org eclipse jdt core javanature lt  nature gt   lt  natures gt

User · Answer

Another alternative to Loganathan Mohanraj s solution  which effectively does the same  but from the GUI     Right-Click on your project Go to  Properties  Choose  Project Natures  Click on  Add  Choose  Java  Click  Apply and Close

[java] This compilation unit is not on the build path of a Java project

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