In Eclipse what can cause Package Explorer red-x error-icon when all Java sources compile without errors

Question

I m using Eclipse for Java development  All my sources compile fine and the resulting application compiles fine  However  I keep getting an  red-x  error notification in the Package Explorer   All my sources in this source directory  too long for the snapshot  compile fine  none of the show the  red-x  error icon   Any suggestions on how to fix the problem would be highly appreciated

User · Answer

So upon finding that there could be a missing package in the buildpath, thus the red x against the main project, to remove this:

1) go into "Configure Buildpath" of project 2) Java Build Path -> Source Tab - you should see the red x against the missing package/file. if it no longer exists, just "remove" it.

red X begone! :)

User · Answer

This can occur for a number of reasons   If you have changed the jdk  the Project facet will have a red X next to it while no other folders shows an error   If this is the case  modify the jdk that is shown   This happens on occasion in our JAX-WS class  HSG

User · Answer

FindBugs also puts a red-x against files packages to indicate static code analysis errors

User · Answer

This happens often when I use Maven  and I had always ignored it until I found this question   You need to update the project in this case  figured this out by looking in the Problems pane   From the project context menu  Maven -  Update Project and select the available maven codebases  Alternatively you can use  Alt   F5  to bring up the same window

User · Answer

Try doing a rebuild  I ve found that the red x s don t always disappear until a rebuild is done

User · Answer

As others have said  bad file references in the build path is often the culprit   Usually a  jar file that has been moved deleted  Eclipse expects to find everything referenced on the build path at the location specified  and will complain if not

User · Answer

In my case what solved this problem was simply to Close Eclipse and opening it again   However I am still not sure why this happened or why it worked  I was having problems Cleaning my project  it said it could not Delete certain file  and this solved it

User · Answer

I encountered this problem today and found this link  I followed as mentioned by Patrick Schaefer above and opened the Update Maven project Dialog  Click on my working project and selected the checkbox  Force Update of Snapshots Releases  and  Ok   All the red cross vanished   I hope this helps anybody in a similar situation

User · Answer

Try to clean the project and rebuild it

User · Answer

This happened when i downloaded fabric io on Eclipse Mars but Restarting computer solved this problem for me

User · Answer

i had same problem  I checked   Problems -Tab and found no server for the project  I defined the server  the red-x disappered

User · Answer

Try to clean the project and rebuild it

User · Answer

Sometimes there are build path errors in  project  and you need to switch to Resource view to actually see the file that is causing the error

User · Answer

Subversion is occasionally the culprit for this as well   It might not have anything to do with your environment   But  there might be a discrepancy between the current and local state of the project   In my case  doing an update  and then a commit to the subversion server provided me with the expected clean result without any flags in the project such as the X

User · Answer

I also experience those misterious error-symbols on packages from time to time  A way to get rid of them that works for me is to effectively remove the JRE System Library from Java Build Path and add it back again

User · Answer

FindBugs also puts a red-x against files packages to indicate static code analysis errors

User · Answer

Try doing a rebuild  I ve found that the red x s don t always disappear until a rebuild is done

User · Answer

I want to start by thanking everyone that answered  But cleaning and rebuilding was not enough in my case because the problem was still there and needed fixing   Turned out that one of my package directories had accidentally been copied so that an extra directory now existed called  Copy of dagskra  containing Java files with wrong package declarations  In addition the errors in this  new  directory don t show up with a  red-x  in the package that it exists in   Snapshot from Package Explorer showing errorous  quot Copy of dagskra quot  directoryr http   www freeimagehosting net uploads a824304b18 png  It was the hint of reading the  Problems  tab  -  that turned me into the right direction  so I m selecting that answer as the accepted answer because this is what I needed   Snapshot from Problems tab http   www freeimagehosting net uploads dea26d5dd0 png  Hoping this will help others

User · Answer

yeah  this happens sometimes for no apparent reason  You can go to the  Problems -Tab  right next to console output  and see the error message  so maybe you can narrow it down that way

User · Answer

Try to clean the project and rebuild it

User · Answer

This happened when i downloaded fabric io on Eclipse Mars but Restarting computer solved this problem for me

User · Answer

yeah  this happens sometimes for no apparent reason  You can go to the  Problems -Tab  right next to console output  and see the error message  so maybe you can narrow it down that way

User · Answer

As others have said  bad file references in the build path is often the culprit   Usually a  jar file that has been moved deleted  Eclipse expects to find everything referenced on the build path at the location specified  and will complain if not

User · Answer

As others have said  bad file references in the build path is often the culprit   Usually a  jar file that has been moved deleted  Eclipse expects to find everything referenced on the build path at the location specified  and will complain if not

User · Answer

So upon finding that there could be a missing package in the buildpath, thus the red x against the main project, to remove this:

1) go into "Configure Buildpath" of project 2) Java Build Path -> Source Tab - you should see the red x against the missing package/file. if it no longer exists, just "remove" it.

red X begone! :)

User · Answer

Sometimes there are build path errors in  project  and you need to switch to Resource view to actually see the file that is causing the error

User · Answer

Subversion is occasionally the culprit for this as well   It might not have anything to do with your environment   But  there might be a discrepancy between the current and local state of the project   In my case  doing an update  and then a commit to the subversion server provided me with the expected clean result without any flags in the project such as the X

User · Answer

I have run through this  My case was more involved  The project was packaged fine from maven command line   Couple of things I made  1  One class has many imports that confused eclipse  Cleaning them fixed part of the problem 2  One case was about a Setter  pressing F3 navigating to that Setter although eclipse complained it is not there  So I simply retyped it and it worked fine  even for all other Setters   I am still struggling with  Implicit super constructor Item   is undefined for default constructor  Must define an explicit constructor

User · Answer

This can occur for a number of reasons   If you have changed the jdk  the Project facet will have a red X next to it while no other folders shows an error   If this is the case  modify the jdk that is shown   This happens on occasion in our JAX-WS class  HSG

User · Answer

Sometimes there are build path errors in  project  and you need to switch to Resource view to actually see the file that is causing the error

User · Answer

This happens often when I use Maven  and I had always ignored it until I found this question   You need to update the project in this case  figured this out by looking in the Problems pane   From the project context menu  Maven -  Update Project and select the available maven codebases  Alternatively you can use  Alt   F5  to bring up the same window

User · Answer

I encountered this problem today and found this link  I followed as mentioned by Patrick Schaefer above and opened the Update Maven project Dialog  Click on my working project and selected the checkbox  Force Update of Snapshots Releases  and  Ok   All the red cross vanished   I hope this helps anybody in a similar situation

User · Answer

yeah  this happens sometimes for no apparent reason  You can go to the  Problems -Tab  right next to console output  and see the error message  so maybe you can narrow it down that way

User · Answer

So upon finding that there could be a missing package in the buildpath, thus the red x against the main project, to remove this:

1) go into "Configure Buildpath" of project 2) Java Build Path -> Source Tab - you should see the red x against the missing package/file. if it no longer exists, just "remove" it.

red X begone! :)

User · Answer

I had the same issue and below steps resolved the issue    Delete the JRE from PROJECT  properties java build path  libraries  Restart the eclipse Add the JRE again Rebuild the project using Project Clean  and chose option to build automatically     Please try

User · Answer

Try doing a rebuild  I ve found that the red x s don t always disappear until a rebuild is done

User · Answer

Try doing a rebuild  I ve found that the red x s don t always disappear until a rebuild is done

User · Answer

I ve run into a similar problem many a time  what happens usually for me is that a java file will say it won t compile in the text editor but in the package explorer it will say it s compiling fine   Sometimes doing a  rebuild  or  clean-build  doesn t work  the files don t actually get built  one has to presume that eclipse thinks the files it has are up to date  and when this happens I usually open up the java build path and just move one of my dependencies down up the pecking order  This forces eclipse to do a rebuild of everything and it always seems to work   If you re still having problems try copying the project and seeing if you get the same behaviour and at a last ditch attempt post a bug for eclipse  it may take a while for them to fix but at least you know that you re being heard

User · Answer

I want to start by thanking everyone that answered  But cleaning and rebuilding was not enough in my case because the problem was still there and needed fixing   Turned out that one of my package directories had accidentally been copied so that an extra directory now existed called  Copy of dagskra  containing Java files with wrong package declarations  In addition the errors in this  new  directory don t show up with a  red-x  in the package that it exists in   Snapshot from Package Explorer showing errorous  quot Copy of dagskra quot  directoryr http   www freeimagehosting net uploads a824304b18 png  It was the hint of reading the  Problems  tab  -  that turned me into the right direction  so I m selecting that answer as the accepted answer because this is what I needed   Snapshot from Problems tab http   www freeimagehosting net uploads dea26d5dd0 png  Hoping this will help others

User · Answer

After build  Refresh project and if still persist just right click Problems tab in eclipse and choose delete all   It often happens if you do maven install and eclipse properties files do not get updated properly  Even though your project does not have any errors  Hopefully

User · Answer

To add to the previous answer  an extreme way of  cleaning  your project is to delete it  that is deleting its reference from the workspace  not deleting the actual files   and then re-import it  Sometimes  it helps

User · Answer

Right click on the project with errors  then in the sub-menus select    Maven   UpdateProject     and then    Select the checkbox for all the dependent projects  select force update of snapshots  click OK    This worked for me

User · Answer

I solved mine by    Close all other projects  i e  unrelated project option  Clean and build   My project was android  and that did it

User · Answer

Also  you may update the project by clicking   Right Click on project name -  Select Maven -  Right click -  Update Project   This helped out for me   Thanks

User · Answer

Try to clean the project and rebuild it

User · Answer

My solution that finally worked was to clean all projects  close eclipse  clean all projects  close eclipse  and so on at least 5-6 times  Eventually it all settled down and everything was as expected  Weirdest thing ever     And no there were no errors in the Problem or console view   Also this happened after a computer crash  The last time it happened my whole workspace was completely lost  It was still there on the computer  but when I tried to access it  it would be all blank    For whatever reason computer crashes are really really really badly handled by eclipse

User · Answer

To add to the previous answer  an extreme way of  cleaning  your project is to delete it  that is deleting its reference from the workspace  not deleting the actual files   and then re-import it  Sometimes  it helps

User · Answer

You can go to project-  Buildpath-  Library  If there is any library that is X marked ie  cross marked  removed it and again try to build  It worked for me as well

User · Answer

FindBugs also puts a red-x against files packages to indicate static code analysis errors

User · Answer

Sometimes there are build path errors in  project  and you need to switch to Resource view to actually see the file that is causing the error

User · Answer

You can go to project-  Buildpath-  Library  If there is any library that is X marked ie  cross marked  removed it and again try to build  It worked for me as well

User · Answer

I had the same issue and below steps resolved the issue    Delete the JRE from PROJECT  properties java build path  libraries  Restart the eclipse Add the JRE again Rebuild the project using Project Clean  and chose option to build automatically     Please try

User · Answer

Also  you may update the project by clicking   Right Click on project name -  Select Maven -  Right click -  Update Project   This helped out for me   Thanks

User · Answer

I ve run into a similar problem many a time  what happens usually for me is that a java file will say it won t compile in the text editor but in the package explorer it will say it s compiling fine   Sometimes doing a  rebuild  or  clean-build  doesn t work  the files don t actually get built  one has to presume that eclipse thinks the files it has are up to date  and when this happens I usually open up the java build path and just move one of my dependencies down up the pecking order  This forces eclipse to do a rebuild of everything and it always seems to work   If you re still having problems try copying the project and seeing if you get the same behaviour and at a last ditch attempt post a bug for eclipse  it may take a while for them to fix but at least you know that you re being heard

User · Answer

I ve run into a similar problem many a time  what happens usually for me is that a java file will say it won t compile in the text editor but in the package explorer it will say it s compiling fine   Sometimes doing a  rebuild  or  clean-build  doesn t work  the files don t actually get built  one has to presume that eclipse thinks the files it has are up to date  and when this happens I usually open up the java build path and just move one of my dependencies down up the pecking order  This forces eclipse to do a rebuild of everything and it always seems to work   If you re still having problems try copying the project and seeing if you get the same behaviour and at a last ditch attempt post a bug for eclipse  it may take a while for them to fix but at least you know that you re being heard

User · Answer

My solution that finally worked was to clean all projects  close eclipse  clean all projects  close eclipse  and so on at least 5-6 times  Eventually it all settled down and everything was as expected  Weirdest thing ever     And no there were no errors in the Problem or console view   Also this happened after a computer crash  The last time it happened my whole workspace was completely lost  It was still there on the computer  but when I tried to access it  it would be all blank    For whatever reason computer crashes are really really really badly handled by eclipse

User · Answer

So upon finding that there could be a missing package in the buildpath, thus the red x against the main project, to remove this:

1) go into "Configure Buildpath" of project 2) Java Build Path -> Source Tab - you should see the red x against the missing package/file. if it no longer exists, just "remove" it.

red X begone! :)

User · Answer

I also experience those misterious error-symbols on packages from time to time  A way to get rid of them that works for me is to effectively remove the JRE System Library from Java Build Path and add it back again

User · Answer

To add to the previous answer  an extreme way of  cleaning  your project is to delete it  that is deleting its reference from the workspace  not deleting the actual files   and then re-import it  Sometimes  it helps

User · Answer

I have run through this  My case was more involved  The project was packaged fine from maven command line   Couple of things I made  1  One class has many imports that confused eclipse  Cleaning them fixed part of the problem 2  One case was about a Setter  pressing F3 navigating to that Setter although eclipse complained it is not there  So I simply retyped it and it worked fine  even for all other Setters   I am still struggling with  Implicit super constructor Item   is undefined for default constructor  Must define an explicit constructor

User · Answer

i had same problem  I checked   Problems -Tab and found no server for the project  I defined the server  the red-x disappered

User · Answer

I have run through this  My case was more involved  The project was packaged fine from maven command line   Couple of things I made  1  One class has many imports that confused eclipse  Cleaning them fixed part of the problem 2  One case was about a Setter  pressing F3 navigating to that Setter although eclipse complained it is not there  So I simply retyped it and it worked fine  even for all other Setters   I am still struggling with  Implicit super constructor Item   is undefined for default constructor  Must define an explicit constructor

User · Answer

To add to the previous answer  an extreme way of  cleaning  your project is to delete it  that is deleting its reference from the workspace  not deleting the actual files   and then re-import it  Sometimes  it helps

User · Answer

I ve run into a similar problem many a time  what happens usually for me is that a java file will say it won t compile in the text editor but in the package explorer it will say it s compiling fine   Sometimes doing a  rebuild  or  clean-build  doesn t work  the files don t actually get built  one has to presume that eclipse thinks the files it has are up to date  and when this happens I usually open up the java build path and just move one of my dependencies down up the pecking order  This forces eclipse to do a rebuild of everything and it always seems to work   If you re still having problems try copying the project and seeing if you get the same behaviour and at a last ditch attempt post a bug for eclipse  it may take a while for them to fix but at least you know that you re being heard

User · Answer

FindBugs also puts a red-x against files packages to indicate static code analysis errors

User · Answer

Right click on the project with errors  then in the sub-menus select    Maven   UpdateProject     and then    Select the checkbox for all the dependent projects  select force update of snapshots  click OK    This worked for me

User · Answer

I want to start by thanking everyone that answered  But cleaning and rebuilding was not enough in my case because the problem was still there and needed fixing   Turned out that one of my package directories had accidentally been copied so that an extra directory now existed called  Copy of dagskra  containing Java files with wrong package declarations  In addition the errors in this  new  directory don t show up with a  red-x  in the package that it exists in   Snapshot from Package Explorer showing errorous  quot Copy of dagskra quot  directoryr http   www freeimagehosting net uploads a824304b18 png  It was the hint of reading the  Problems  tab  -  that turned me into the right direction  so I m selecting that answer as the accepted answer because this is what I needed   Snapshot from Problems tab http   www freeimagehosting net uploads dea26d5dd0 png  Hoping this will help others

User · Answer

I want to start by thanking everyone that answered  But cleaning and rebuilding was not enough in my case because the problem was still there and needed fixing   Turned out that one of my package directories had accidentally been copied so that an extra directory now existed called  Copy of dagskra  containing Java files with wrong package declarations  In addition the errors in this  new  directory don t show up with a  red-x  in the package that it exists in   Snapshot from Package Explorer showing errorous  quot Copy of dagskra quot  directoryr http   www freeimagehosting net uploads a824304b18 png  It was the hint of reading the  Problems  tab  -  that turned me into the right direction  so I m selecting that answer as the accepted answer because this is what I needed   Snapshot from Problems tab http   www freeimagehosting net uploads dea26d5dd0 png  Hoping this will help others

User · Answer

I have run through this  My case was more involved  The project was packaged fine from maven command line   Couple of things I made  1  One class has many imports that confused eclipse  Cleaning them fixed part of the problem 2  One case was about a Setter  pressing F3 navigating to that Setter although eclipse complained it is not there  So I simply retyped it and it worked fine  even for all other Setters   I am still struggling with  Implicit super constructor Item   is undefined for default constructor  Must define an explicit constructor

User · Answer

yeah  this happens sometimes for no apparent reason  You can go to the  Problems -Tab  right next to console output  and see the error message  so maybe you can narrow it down that way

User · Answer

In my case what solved this problem was simply to Close Eclipse and opening it again   However I am still not sure why this happened or why it worked  I was having problems Cleaning my project  it said it could not Delete certain file  and this solved it

User · Answer

As others have said  bad file references in the build path is often the culprit   Usually a  jar file that has been moved deleted  Eclipse expects to find everything referenced on the build path at the location specified  and will complain if not

User · Answer

I solved mine by    Close all other projects  i e  unrelated project option  Clean and build   My project was android  and that did it

User · Answer

After build  Refresh project and if still persist just right click Problems tab in eclipse and choose delete all   It often happens if you do maven install and eclipse properties files do not get updated properly  Even though your project does not have any errors  Hopefully

[java] In Eclipse, what can cause Package Explorer "red-x" error-icon when all Java sources compile without errors?

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