Eclipse Java code completion not working

Question

I ve downloaded  unzipped and setup Eclipse 3 4 2 with some plugins  noteable  EPIC  Clearcase  QuantumDB  MisterQ     Now I find when I m editing Java projects the code completion is not working   If I type String  and press ctrl space a popup shows  No Default Proposals  and the status bar at the bottom shows  No completions available    Any ideas

User · Answer

I had this problem and like  Marc  only on a particular class   I discovered that I needed to designate Open With   Java Editor   As a Eclipse newbie I hadn t even realized that I was just using a plain text editor   In the package explorer  right-click the file and chose  Open With

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If you have installed Google Toolbar for IE  may be you can face the same problem  Because  the toolbar capture the shortcut ctrl Space

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In case someone comes here and want to activate the autocomplete function  go to  Preferences - gt  Java - gt  Editor - gt  Content Assist    Then in the Auto Activation section fill in Auto activation triggers for Java    abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ

User · Answer

I also face this issue but it is resolved in different way  Steps that I follow may be helpful for others    Right click on project  the one you are working on  Go to Properties   Java Build Path   JRE System Library Click Edit    on the right Choose the JRE 7

User · Answer

Try restoring the default options in  Windows  gt  Preferences  gt  Java  gt  Editor  gt  Content Assist  gt  Advanced   An example of the kind of data you see in this preference screen  however not necessarily what you currently have      From Vadim in this blog post   Content Assist Duplicates in Eclipse  Mylyn    if have duplicate Mylyn entries  uncheck the duplicate entries that do not contain   Mylyn   in their name   The Eclipse help page defines the default list to restore      Select the proposal kinds contained in the  default  content assist list          Other Java Proposals     SWT Template Proposals     Template Proposals     Type Proposals

User · Answer

Once you have you configuration checked and completion is still not working    make sure you have the right directory structure    Do you see the right icon beside the file      It will tell you how the file will be treated by Eclipse     I am posting this answer as I had that story with with Maven webapp artifact  By default Maven-WebApp does not create folder for sources and I put my Java into resources  wondering for 5 minutes what was going on

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I experience problems on Eclipse Neon when editing a file which does not belong to the project directory  When I copy the same file to the project root directory  not even to the src directory  the completion starts working   When the file is opened from a different directory  only completion for JRE works  That is for example  java  completes  but junit  does not

User · Answer

None of these worked for me   I was experiencing this issue in only once particular class   What finally worked for me was to delete the offending class and recreate it   Problem solved    mystery not so much

User · Answer

Check the lib of your project  It may be that you have include two such jar files in which same class is available or say one class in code can be refrenced in two jar files  In such case also eclipse stops assisting code as it is totally confused   Better way to check this is go to the file where assist is not working and comment all imports there  than add imports one by one and check at each import if code-assist is working or not You can easily find the class with duplicate refrences

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Running STS on Java Spring Boot projects  here s what works for me

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For those running Xfce   having IBus plugin activated  there might be keyboard shortcut conflict   See more info on my blog  http   peter-butkovic blogspot de 2013 05 keyboard-shortcut-ctrlspace-caught-in html   UPDATE   as suggested by  nhahtdh s comment  adding the some more info to answer directly  IBus plugin in Xfce uses by default Ctrl Space shortcut for keyboard layout switching  To change it  go to  Options and change it to whatever else you prefer

User · Answer

Check that you did not filter out many options inside the Window   Preferences   Java   Appearance   Type Filters  Items in this list will not be appear in quick fix  be autocompleted  or appear in other various places like the Open Type dialog

User · Answer

I have run into this problem since upgrading to Eclipse 2019-09   Based on some of the suggestions above  this is what worked for me   I had to go to Eclipse -  Preferences -  Java -  Editor -  Content Assist -  Advanced     I found out that if I turn on any of the key binding proposals  Java Non-Type  Java  Java  Task-Focused  or Java Type proposal  then I was able to use auto complete   If I turned them all on  then not only did auto complete work  but I got duplicate methods listed   I am guessing  but I will probably used Java Type Proposals   Any clarification of what differs for these four types would be appreciated

User · Answer

Another solution which worked for me is to go to Java--  Appearence --  Type Filters and do disable all

User · Answer

Just in case anyone got to a desperate point where nothing works    It happened to us that the content assist somehow shrunk so no suggestion was shown  just the  Press Ctrl Space for non-Java     could be seen  So  it was just a matter of dragging the corner of the content assist to enlarge the pop-up   I know  embarrassing  Hope it helps   Note  this was an Ubuntu server with Xfce4 using Eclipse Oxygen

User · Answer

In my case  Intellisense had only disappeared in a few classes in one project  It turned out this was because of a missing library on the build path  although it worked previously    So definitely check all the errors or problems in Eclipse and try to find if a library may be missing

User · Answer

I faced this problem  and spent hours trying to figure out the issue  tried to follow the steps mentioned in the different answers above  the solution I found is on the same lines as Mona suggested  but slightly different  Tried to add as a comment to Mona s answer but no option was available  Issue with my eclipse was  classpath somehow got corrupted and all the jars and dependent projects were missing  after taking the latest  classpath from repository it worked fine

User · Answer

Maybe this helps other people who come across the same issue   My setup  old Gradle project  version Gradle 2 12  made by someone else  imported using the Gradle Import Wizard into STS  Eclipse Oxygen 2  4 7 2     Code completion did not work either  and I still have hollow Js at the Java files   but at least I got the code completion to work by doing    right click on the project folder   Properties   Gradle   Configure Workspace Settings   Java   Editor   Content Assist   Advanced check  Java Proposals in upper window  2x Apply  amp  Close

User · Answer

I m adding an answer here in case someone else finds this on Google  Same symptoms  different problem  For me  the type caches had become corrupt   From http   mschrag blogspot co nz 2009 01 open-type-cant-find-your-class html   Quit Eclipse Go to workspace  metadata  plugins org eclipse jdt core Remove   index and savedIndexNames txt Restart Eclipse and search Ctrl T for the offending type  The indexes will be rebuilt

User · Answer

For me the issue was a conflict between several versions of the same library  The Eclipse assist was using an older version than maven    I had to go to the  m2 directory and delete the unwanted lib version   restart eclipse

User · Answer

For those who use the latest 3-19 eclipse build   It just happened to me when upgrading from Oxygen to 3-19 eclipse version  so I assume the auto-complete feature does not migrated correctly during the upgrade process   The only solution that worked for me was to create a new eclipse workspace  and import the project s to it  It might take a few minutes  but it worth it - comparing to the time spent on other solutions

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I ran into this and it ended up being I was opening the file with the text editor and not the java editor   I wanted to comment on https   stackoverflow com users 607470 elroy-flynn response but the add comment only works after I have a rating of 50  not sure WTF that is     Thanks  Tom

User · Answer

If you re experiencing this in an enum  or when initializing an array with anonymous classes  it s a known bug in Eclipse  See Eclipse content assist not working in enum constant parameter list

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