What is the reason for a red exclamation mark next to my project in Eclipse

Question

I have a red exclamation mark over my project name in Eclipse  looking like this -    Does anyone know what this means and what I should I do about it

User · Answer

What worked for me  and probably not yet answered here till now      While working on a Selenium project and ANT  I had copied and placed TWO different  BUILD xml  files from 2 different sources in the Project s ROOT directory  This resulted in this RED-EXCLAMATION-MARK  which disappeared as soon as I moved one of the BUILD xml file to another folder   As to  why I had two BUILD xml files in ONE project    I was actually playing around with ANT s config from various BUILD xml files

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I had a maven project giving me same thing  It showed that it couldnt find the jar with that version  dependency  and I knew its there and is correct -   So  for me the solution was to  1 delete the local repository   2 Clean the project   3 Disable the maven nature  4 Generate eclipse artifacts and  5 re-configure as maven project    in order

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This is may for one reason  If a project contains library project then you need to clean first the library project have been used  then clean the project contains that library project

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There is a Problems view  try Window- Show View  which shows this kind of thing   It s usually missing Jars  eg your project configuration references a jar that isn t there   and that kind of thing  in the case of JDT  but obviously these days Eclipse can be used in so many ways  it could be anything

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In my case this is incorrect improper dependency  Markers   Problems is highlighting spring  gradle cache httpcomponents       pom is not valid archive  I removed  compile group   org apache httpcomponents   name   httpcomponents-client   version   4 5 6   ext   pom   changed to   compile group   org apache httpcomponents   name   httpclient   version   4 5 6

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use this simple steps right click on the project- properties - java Build path-  click on the jre system library and remove it after that step click on Add library and add a new jre system library that will resolve it

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Solutin 1   step 1  Right click on your project -  Close Project  it will Close your project and all opened file s  of the project  step 2  Right click on your project -  Open Project  it will Open your project and rebuild your project  Hope fully it will fix red exclamation mark  Solution 2   Step 1  Right click on your Project -  Properties -  Java Build Path  Can you see missing in front of your library file s  as per following screen-shot  Step 2 Click on Add Jar to select your Jar file if it is the placed in WEB-INF lib of your project or Add External Jar if jar file placed somewhere on your computer  Step 3 Select the old missing file s  and click on Remove click here for image  Solutioin 3  Right click on your Project -  Properties -  Java Build Path -  JRE System Library and reconfigure the JRE  and go to your project and remove  properties and  classpath in your project directories   backup your project data and create a new one and follow the solutions 1  amp  2

User · Answer

Mark Circular dependcies as  Warning  in Eclipse tool to avoid  A CYCLE WAS DETECTED IN THE BUILD PATH  error  In Eclipse got to  -  Windows -  Prefereneces -  Java-  Compiler -  Buliding -  Circular Depencies  Thanks

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If you change the location of the jars from selenium-java-3 13 0 folder this mak will appear  So restore the original location of the jars and you are go to go

User · Answer

It means the jar files are missing from the path that you have given while configuring Build Path adding jars to the project   Just once again configure the jars

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To Remove RED EXCLAMATION mark on project  I have deleted all JAR files using BUILD Path-- gt  LIBRARY -- gt  ADD EXTERNAL JARs and remove all or selected JAR  Reinstall again  This action resolve my issue with Red exclamation mark

User · Answer

This is related to multiple versions of same depenendency in the local repository  m2  go to ur eclipse   problems tab   see the errors   go the local  m2 folder  delete all the non relevant versions of the the  dependency which you have added recently   then try to rebuild the project

User · Answer

It means there is a problem with the build path in your project  If it is an android project then it mostly means the target value specified in project properties file cannot be found  This can also be caused because of other kinds of built problems  But it is shown mostly for built problems only  See here for more details  It is about built error decorater seen in eclipse   An extract from that page      Build path problems are sometimes easy to miss among other problems in   a project  The Package Explorer and Project Explorer views now show a   new decorator on Java projects and working sets that contain build   path errors             The concrete errors can be seen in the Problems view  and if you open   the view menu and select Group By   Java Problem Type  they all show   up in the Build Path category

User · Answer

Go to Project -  right click -  properties -  Java Build Path -  Libraries  Delete all the JARs which have red cross symbol on the icon   Resolved

User · Answer

There can be several reasons  Most of the times it may be some of the below reasons      You have deleted some of the  jar files from your  lib folder You have added new  jar files you have added new  jar files which may be conflict with others   So what to do is we have to resolve those missing   updating   newly added jar files    right click on the project and go to properties Select Java Build Path go to the Libraries tab Remove the references of the jar files which you have removed already  There will be a red mark near them so you can identify them easily  Add the references to the newly added  jar files by using Add JARs Refresh the project   This will solve the problem if it s because one of the above reasons

User · Answer

I Solved this problem by   step 1  C  user rafiq  m2 repository --  Delete this folder  Step 2  right click on your project-- maven-- update maven project-- check only clean project-- ok   Step 3  right click on your project-- maven-- update maven project-- check only update project-- ok   Problem Solved

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This is probably a build problem  What fixed mine was updating the project with maven  Alt   F5

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Isn  t it a strange behavior  In my case  the mistake was that I added a jar-lib  But this lib was faulty  so I removed the lib  But  no matter what I  ve done  the error still exists  I removed the jar-file  even with the eclipse option  remove from build-path   deleted it on my project-folders and cleaned my project  but nothing worked  Only after I  ve done the way Qwert has described  it worked  But sould an IDE not independent from error messages  The error was fixed  only the messages caused the problem  Thanks to Qwert  if I got enough reputations  I will vote your answer  But now I am not able to  sorry

User · Answer

Mainly this problem occurs because your library files get deleted  The simple way to work your project as it was working previously is  1  Go to Project properties 2  Select java Build Path 3  Remove all library except jre  4  Now add the same same jar file by clicking  Add external jars

User · Answer

If you are facing same issue     Recall   if you have changed the place where you used to keep the jars and add it in build path   If you have moved your project from one machine to another then you need to right click on project-  Build Path -  Configure Build Path   In Tab Order and export you would see the place where eclipse is searching for jars   just keep it there and refresh the project    If above things don t work   try Project -  clean

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i was having the same problem    the actual issue was missing  jar file which took palce coz of changing my workspace  i just deleted the appcompat folder which has the  jar  file  from my new workspace and copied it from my old workspace  this solved my problem

User · Answer

if you are using maven pom xml then check whether you have used dependency for poi-ooxml-schemas  I was getting the red exclamation as I was using version 3 17  Changed the version to 4 1 2 and the red exclamation on maven disappeared  In other words what I meant to say was  use an updated version  this may help

User · Answer

If your IDE doesn t find JRE from the path you given  Then you manually need to add JRE path in eclipse to remove red exclamation mark from the project  To do this please follow below steps  -  Go to to Properties Java Build Path Libraries  Click on Edit   Then Select Alternate JRE and click on Finish   Note   If you don t have Java Run time Environment  JRE  installed  please install

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I also had this problem several times and I could  solve  it by just deleting the messages in the  Problems -tab and building the project again  Select the project and click on the menu bar Project - gt  Clean    select your project again and okay

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There might be some deleted jar files already in build path  Right click on project  Properties- Java Build Path and removed deleted jar files from there

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I too faced this strange situation  What I got to know is that  earlier I ran my spring projects with Spring version 1 5 4 and later for one project I chose version 2 0 1  That s when I got this error  When I visited POM and changed Spring version to 1 5 4 manually  the error was gone  What I guess is that  maven downloads the required JARs according to the Spring version specified  If you change the version  maven won t download JARs if those JARs are already downloaded for previous Spring version and found in  m2 source folder found as C  -  Users -   Logged-In-User-Name  -   m2 path    What I did again was to keep the Spring version as it is  as 2 0 1   I opened the Problems view as said earlier and I deleted the JARs which were said as not found in the Problems view by visiting  m2 folder  the Paths were mentioned in the Problems view for were the JARs are   I then updated the maven and all problems were gone   That s how I conclude that the problem was with JARs which were downloaded for the previous Spring versions in  m2 folder

User · Answer

This is common  you will need to do the following steps   1- Right click on the project  2- Build path  3- Configure Build Path  4- Remove jars projects that had moved from their old path   5- clean the project  6- build the project  if not automatically built    7- Add the jars projects using their new locations  Run and that is it

User · Answer

My problem concerning exclamation mark was in the section   right click on project folder  - Properties - Libraries tab  There was an Error marked in red on a libray that probably wasn t in the right place so I removed it and ex  mark disappeared  The problem raised after deleting some old projects

User · Answer

If it is maven project and your project view not having any issue  Then try the following steps Right click the project --- gt  maven -- gt  update maven

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For Maven project delete the project from IDE and run the maven command  -mvn eclipse clean  mvn eclipse eclipse mvn clean install -e  After this import the project on IDE  This stuff is works for me

[eclipse] What is the reason for a red exclamation mark next to my project in Eclipse?

What worked for me (and probably not yet answered here till now) ::

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