Eclipse/Java code completion not working

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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

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