What does the red exclamation point icon in Eclipse mean

Question

What does the red exclamation point icon in Eclipse mean  There are lots of different search results on the Internet about  red exclamation point icons  and  red exclamation mark decorators  and  red bang icons   no doubt because lots of plugins and programming-related tools use red exclamation point icons  So  to be clear  this is the one I mean     It appears as a decorator on projects in the Package Explorer view   In my case  the icon went away when a missing build path variable was filled in  I m using MyEclipse 9 0  but I don t think this is MyEclipse-specific  Other people on the Internet have reported that it has to do with other issues  including Subclipse  the  svn folder and moving files between working copies

User · Answer

The solution that worked for me is the following one given by Steve Hansen Smythe. I am just pasting it here. Thanks Steve.

"I found another scenario in which the red exclamation mark might appear. I copied a directory from one project to another. This directory included a hidden .svn directory (the original project had been committed to version control). When I checked my new project into SVN, the copied directory still contained the old SVN information, incorrectly identifying itself as an element in its original project.

I discovered the problem by looking at the Properties for the directory, selecting SVN Info, and reviewing the Resource URL. I fixed the problem by deleting the hidden .svn directory for my copied directory and refreshing my project. The red exclamation mark disappeared, and I was able to check in the directory and its contents correctly."

User · Answer

According to the documentation      Decorates Java projects and working   sets that contain build path errors   In practice  I ve found that a  build path error  may be caused by any number of reasons  depending on what plugins are active   Check the  Problems  view for more information

User · Answer

I found another scenario in which the red exclamation mark might appear   I copied a directory from one project to another  This directory included a hidden  svn directory  the original project had been committed to version control   When I checked my new project into SVN  the copied directory still contained the old SVN information  incorrectly identifying itself as an element in its original project   I discovered the problem by looking at the Properties for the directory  selecting SVN Info  and reviewing the Resource URL  I fixed the problem by deleting the hidden  svn directory for my copied directory and refreshing my project  The red exclamation mark disappeared  and I was able to check in the directory and its contents correctly

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

I had the same problem and Andrew is correct  Check your classpath variable  M2 REPO   It probably points to an invalid location of your local maven repo    In my case I was using mvn eclipse eclipse on the command line and this plugin was setting the M2 REPO classpath variable  Eclipse couldn t find my maven settings xml in my home directory and as a result was incorrectly the M2 REPO classpath variable  My solution was to restart eclipse and it picked up my settings xml and removed the red exclamation on my projects   I got some more information from this guy  http   www mkyong com maven how-to-configure-m2 repo-variable-in-eclipse-ide

User · Answer

Make sure you don t have any undefined classpath variables  like M2 REPO

User · Answer

I also faced a similar problem when i tried to import Source file and JAR file from one machine to another machine  The path of the JAR was different on new machine compared to old machine  I resolved it as belows   Right click on the  Project name  Select  Build path  Then select  Configure Build Path  Click on  Libraries  Remove all the libraries which were referring to old path    Then  the exclamation symbol on the  Project name  was removed

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 jar file references 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

What I did was peculiar but somehow it fixed the problem   Pick any project and perform a fake edit of the build properties file  e g   add and remove a space and then save the file   Clean and rebuild the projects in your workspace   Hope this solve some of your problems

User · Answer

The solution that worked for me is the following one given    I selected the particular project  right click  Build path configure Build path  Libraries  I noticed that JRE system Library was showing Unbound  hence    selected that Library click on Remove click on Apply click on add Library JRE system Library next workspace default JRE click on Finish Apply ok   now you will not see these exclamation icon in your project

[eclipse] What does the red exclamation point icon in Eclipse mean?

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