Eclipse/Java code completion not working

In case someone comes here and want to activate the autocomplete function, go to

Preferences -> Java -> Editor -> Content Assist.

Then in the Auto Activation section fill in Auto activation triggers for Java: 

abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ._

enter image description here


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.

Try restoring the default options in 'Windows > Preferences > Java > Editor > Content Assist > Advanced'

An example of the kind of data you see in this preference screen, however not necessarily what you currently have.

eclipse content assist setting

(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

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.

Tags:

Java

Eclipse

Ide

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