Eclipse All my projects disappeared from Project Explorer

Question

It seems like all my projects  except one  disappeared from the view Project Explorer   I m using Eclipse Java EE IDE for Web Developers  Version  Helios Service Release 2 Build id  20110218-0911  Note  all the projects are present on the file system   How to bring them back  Any ideas

User · Answer

None of the answers provided here worked for me. My Enterprise Explorer was completely grey and I couldn't even import or reimport projects.

In my .metadata.log I saw this error:

assertion failed: working set with same name already registered

So I deleted these file:

.metadata.plugins\org.eclipse.ui.workbench\workingsets.xml

Now I can see all my projects. I didn't have to add them back again.

User · Answer

My solution is open view menu and select  Top Level Elements  and set  Projects

User · Answer

Not sure how why  but this happened to me once when I added a task to Mylyn  Seemed that mylyn was filtering my projects  When I deleted the task they all came back

User · Answer

Also had this Problem   My Solution was to uncheck the Box PyDev  Closed Projects  even if those hidden Projects are PHP and NOT Python Projects   Strange BUG in Eclipse Aptana      Be aware that even  Closed Projects   a Topic above Pydev closed projects  is also unchecked  So you have to uncheck both Settings   this  eclipse shows only  quot open projects quot  in project explorer

User · Answer

I was having the same problem for Android projects in Eclipse  This link was very helpful in restoring the missing projects    Go to  File- Import- General- From Existing Project   Select the root folder to the Workspace  Click on the  Refresh  button  Select the required projects and click  Finish  button

User · Answer

It seems it happens to us all  I was happily hacking away at javascript  nowhere near all the nasty hibernate java stuff  and boom   cant find org jboss logging BasicLoging   I havent touched anything   After an hour or so of trying to make that appear  restarting servers  mysql  eclipse  adding jars that weren t needed before I deployed the fix all solution  the off button  Then zap  no project   I am still none the wiser as to why calling Configuration   should now require jboss-logging   jar  maybe I needed it all along for when bad things happen   My input is   use git  keep as little of your stuff in the eclipse workspace area as possible  Then just import project from existing git repo when eclipse loses it s marbles  I also lost my server config  it s there but eclipse insists there no server config  stuff and bombs  So make another one  I ve expressed my feelings about eclipse in my new server name  and copy your apache xml configs  workspace Servers I Love Eclipse  over from the original perfectly good directory

User · Answer

Today 22-03-2016  I check again this question and using ECLIPSE MARS I solved with    Having Eclipse opened  go on FILE -  RESTART   Go on same workspace and I have all project on  PROJECT EXPLORER   Sometime also this operation  will solve  Clicking on Projects dor see all project        So Other solution is

User · Answer

I also had the same problem   file restart  Projects and modules appeared after restarting the eclipse  but faced new error   An internal error occurred during   AppXray Indexing      java lang NullPointerException   So it s good to be on safe side  import the project again in a new workspace

User · Answer

Solution that Cerin provide  importing each time that this problem happens  could be boring   So I ve implemented a script that control if workspace setting exits  if not  restore it to default   I have an eclipse shortcut icon on the top panel that execute     opt eclipse checkWorkspace  amp  amp   opt eclipse eclipse   Script checkWorkspace is the seguent      bin bash  ECLIPSE CONFIG PATH   opt eclipse configuration  ECLIPSE CONFIG FILE  config ini  ECLIPSE CONFIG SETTING  osgi instance area default  DEFAULT WORKSPACE PATH   user home workspace  ECLIPSE LOG   var log eclipse log   cd   ECLIPSE CONFIG PATH   function sedeasy     sed -i  s   echo  1   sed -e  s                    amp  g     echo  2   sed -e  s     amp      amp  g   g   3    WORKSPACE EXISTS   cat   ECLIPSE CONFIG FILE    grep   ECLIPSE CONFIG SETTING      If workspace setting doesn t exists  if   -z   WORKSPACE EXISTS     then   echo  worskspace setting not exists  resetting to default    gt  gt    ECLIPSE LOG    newConf   ECLIPSE CONFIG SETTING      DEFAULT WORKSPACE PATH    echo   newConf   gt  gt    ECLIPSE CONFIG FILE       else          if setting exist but it is empty    vals    WORKSPACE EXISTS            length   echo    vals         if      length   -lt 2    then        newConf   ECLIPSE CONFIG SETTING      DEFAULT WORKSPACE PATH         confToReplace   echo   vals 0           sedeasy   confToReplace    newConf    ECLIPSE CONFIG FILE         echo  worskspace exists but is empty  resetting to default    gt  gt    ECLIPSE LOG     else       echo  Worskspace already set      vals 1       fi fi   Maybe could be semplified  but works

User · Answer

Do the following steps           File -- gt  Import -- gt  Existing Projects into Workspace           Select the root directory as ur old root folder           Finish    Yahoo   There is ur old projects again in ur project explorer

User · Answer

if you use the  Task List  view of Eclipse  it will sometimes try to hide files or projects that it thinks are not associated with a given task  i e  any file that was not opened while you had a certain task selected as the current task   If you want Eclipse to stop hiding files in that case  you can just delete all tasks   Or you may also  restart your eclipse and by just closing the project and then opening it again  from the right mouse click context menu  the files will be restored   If that doesnt get your projects back then check the  filters option    Click on right corner of Project Explorer tab and open context menu  Select Filters option from menu  and make sure that your projects type isnt checked

User · Answer

All of my projects were closed and I had hid the closed projects in the settings   So to open projects go to top right view menu  and uncheck Closed Projects option  Assuming it is checked already

User · Answer

If any of the previous methods don t work for you then delete your old workspace  create a new workspace and put it by default  You can do this by launching Eclipse twice - the second time it asks you for the workspace      Then re-import all your projects there and say  problem  goodbye

User · Answer

When this happened to me I had somehow set the Project Explorer to only display Working Sets  I had none  so nothing was displayed    To fix it  I went to the Project Explorer View Menu  next to the Minimize and Maximize icons in the Project Explorer   Top Level Elements -  Projects   Thanks to  antonagestam for pointing me in the right direction

User · Answer

if you go to Quick Access and type in Projects you will get it your projects back

User · Answer

Go to      File --  Import --  General --  Existing Project into Workspace   Then   In Root Directory Enter the workspace path where all your projects saved  amp  click refresh as below    And Click Finish

User · Answer

I had the same problem in Luna  Suddenly my projects were gone in start-up  I solved this by select Deselect working set option in the drop-down menu in Project Explorer   Note  I post this answer even this is not a right answer for this question  Since I search for Luna and came here while trying with discussed things I was find this solution  This may help others

User · Answer

you should check the active Working Set - make sure it is off

User · Answer

File - Import - Existing projects into workspace - browse - choose your workspase - done

User · Answer

1  File   import   Existing projects into workspace  2  Choose your workspace folder 3  select all of your projects  4  finish   All are OK with above way

User · Answer

Got this issue on returning to an Eclipse project on a VM after leaving it untouched for maybe a couple of weeks    I started to apply the accepted answer  but when I got to the step of renaming the folder and had exited Eclipse  I saw there was an instance of Eclipse still running  I realized Windows had for some reason started a second instance of Eclipse when I hit the taskbar button  The second instance had been unable to access the workspace while the first instance was using it    Once I undid my folder rename  and closed and restarted the original instance of Eclipse  I was able to use File- Switch Workspace to get my normal workspace back

User · Answer

I had the same problem in Aptana  all of a sudden my projects were gone  Solved it by going to the drop-down menu in Project Explorer and going Top Level Elements -  Projects

User · Answer

As a preliminary  before reimporting everything   here is a solution to recover working sets in which project were  if any    I had more than 100 projects and each was in one of 14 working sets  If your top level elements changes  accidentaly or not if it is a bug  from  Working set  to  Projects   you only see projects that are NOT in a working set  and if  as I do  you don t have any projects outside a working set  you think all is lost because you cannot see anything  blank package explorer   So the solution is now obvious  click on the top left small white triangle MENU  than select  Top level elements   than select  Working sets   You also have the possibility to rearrange the working sets list items  Hope it helps Unfortunatly the working sets were empty after the recovery  but at least I recovered their names   Config  Eclipse Oxygen 2 Release  4 7 2  with Java 1 8 on Windows 10

User · Answer

I had this trouble recently  but in my case I hid all items by myself when check all items in  Filters and  ustomization  dialog   I just didn t read note on top of them  and had thought that checks will allow TO SEE any additional items in Project Explorer  But in reality  checking that checks HIDE corresponding items from Explorer   Please note this     Dialog     way to open this dialog

User · Answer

I found a solution that worked better for me   Under my home folder I found a workspace  metadata folder   I copied this folder into my eclipse workspace  replacing the  metadata folder that had been there   When I started Eclipse everything was back to the way I had left it - all projects present  all open files were still open  etc   Just like nothing had happened  I m using Neon

User · Answer

I tried differently for the same issue and worked    Go to your project location in hard drive  ex   home user workspace project settings and Delete this file org eclipse core resources prefs  For full details check out bellow link  http   errorkode com viewtopic php f 20 amp t 8 amp sid 40cff1661bf0ace12878d6d6fb7e75ac

User · Answer

Mona is correct - Make sure that you have the task list set to show ALL as the image shows   Click the arrow to the left of the project if you want to re-factor your filter   Reset your perspective if you do not see the task list

User · Answer

Click on Windows   Open Perspectives   java   Press Ok  Project Explore will come back on screen

User · Answer

If Eclipse was killed during a shutdown  the projects database may become corrupted  the project database is normally located in   workspace  metadata org eclipse core resources  root 1 tree    A message like this will be logged in Workspace  metadata  log    MESSAGE Could not read metadata for       metadata  plugins org eclipse core resources  root  markers    The data is lost  You need to import your projects again  File- Import -  General- Existing Projects into Workspace    The list of projects that were in the workspace can still be seen in  metadata org eclipse core resources  projects    Projects located outside the workspace will have a  location file with the path to the project

User · Answer

Choose     File   Switch Workspace   MyWorkSpace   Eclipse restarts and if you are as lucky as me  the projects are mapped correctly      In my case I have the developer environment on a shared server with about 10-15 users that may accidentally change things that affects other users    Tip of the day   Don t do that

User · Answer

Tedious but it worked for me  Kepler     Using the OS zip utility  zip everything below the project workspace folder to a zip file  to be placed in a separate directory  will use c  tmp workspace zip as an example     Unzip workspace zip to the c  tmp directory   Assume there s a project folder called Project1  a   Ensure all the files in Project1 have Full Control permissions for Everyone or at least 777 permissions  Remove all the project folders in the Eclipse workspace  Recreate each project one by one according to its original type  Java  Dynamic Web  etc      Will use Project1 as an example    Do not add anything  In Eclipse  do File -  Import -  File System   Then select c  tmp Project1 as a source Select the workspace Project1 as a destination   Do not overwrite any file  In Eclipse  refresh the project and test it   It should work

User · Answer

This happened to me  I m still not sure how  but the reason was that my workspace meta data had become corrupted  probably due to Eclipse being improperly shutdown  The solution  as explained here  is to   Note  steps 2  amp  3 are optional if Eclipse isn t crashing  but just not showing any projects    Close Eclipse  cd  home user workspace  metadata  plugins mv  org eclipse core resources org eclipse core resources bak Start Eclipse Do File- Import General- Existing Projects into Workspace Click the  Select root directory  field and browse to each subfolder in your workspace folder  and import    For me  this was very tedious  since I had several dozen projects in my workspace  but it s the only solution I found short of restoring my entire workspace from a backup   Edit  This answer is now quite old  and better solutions may now exist  Although I haven t had need to try it  I recommend attempting  antonagestam s solution first  as others have suggested it may be faster and more effective   Edit  Since it s fairly simple  I d recommend trying antonagestam s solution first  However  this problem recently re-occurred for me  and that solution did not work in my case  But neither did it interfere with this solution

User · Answer

I tried many solutions  I found mine in the drop down menu of the Entreprise Explorer  - Deleting org eclipse core resources has no effect  -  Top Level Elements -  Projects  was already checked for me  swtiching with Documents has no effect   - Selecting all extensions in the filter option of the drop down menu has no effect at first sight  maybe it solve part of the problem   The solution come from  Unselecting documents   third choice in the Entreprise Explorer drop down menu   I think that choice reset the filtering of documents displayed in the Explorer   Hope it ll helps JN Gerbaux

[eclipse] Eclipse: All my projects disappeared from Project Explorer

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