Eclipse f3 not opening declaration - eclipse

Question

I have Eclipse (Mars) web development tools installed on a MacBook Air. Recently, hitting f3 stopped opening the declaration.
The key mapping in Eclipse (Mars) - web development tools:
In another Eclipse install (Luna) - Android development tools, where the f3 function is working, the key mapping is:
What is wrong with the Mars version? What do I need to add to get it to work in the Java editor?
I have seen this post, but I don't have the exact same issue. Nothing happens when I hit f3.
Additionally
Other short cut keys work.
Opening the declaration with the context menu does work.
But there is no key short cut listed in the context menu.
Did this key mapping change with Mars? In my Luna verion, the context menu has the key map listed:

Answer 1

I've the same issue. You can use "Ctrl + Left mouse click" instead.

Answer 2

Make sure your function lock key is not pressed. I apparently hit mine and didn't notice given that F3 is the only function key I use.
Seems stupid but this literally happened to me and the other suggestion didn't help.

Answer 3

In eclipse mars goto:
window
preferences
General
Keys to open the key mapping view.
type 'open declaration' in the filter text.
copy one of the commands that are already there Copy Command
Enter 'F3' in the Binding.
In the drop down menu of the combo box of 'When' select Editing
Then whatever Language You Are Using
Source
Apply
and press Ok

Answer 4

I had the same issue after installing Apache Directory Studio.
Go to Window->Preferences, General->Keys. Filter for F3 and you'll see all the different ways that F3 is bound. I got it to work again by disabling F3 in the LDAP windows (i.e. deleting the binding).

Answer 5

Some suggestions to try:
1) Try creating a new workspace, and check if F3 works
2) Try switching to a different perspective
3) Try downloading a different eclipse release, maybe the java developers release, check that F3 works, then install whatever you need for web development.
Good luck :)

Answer 6

Right Click on the project -> Properties -> Project Facets -> Click on the Configuration Link -> Click on Apply Button -> Click on OK button.
The above steps should set your project as a Java project.

Answer 7

Looking at the comparison of the preferences that work vs what does not work, the issue is clear.
Go to: Window/preferences/General/Keys to open the key mapping view.
Type 'Open declaration' in the search box
Enter 'F3' in the Binding textbox.
If you are editing for C++, Java any language, you need to have a specific F3 binding for that language!
Example for Java source code select 'Editing Java Source' in the 'When' dropbox.
Apply and press Ok

Answer 8

Even I faced the same issue in windows,I was using cucumber and was unable to navigate using F3. I solved by doing the following:
Click on Help in Eclipse >
Eclipse MarketPlace
type "Natural" in search and press enter
Install "Natural 0.9" plugin
Restart Eclipse
This should work, if not working even after that, uninstall cucumber plugin in Eclipse Marketplace
You will be able to navigate from Gherkins, even after this if you are finding issues do the following:
Go to Window ->Preferences, General->Keys > Click on "Restore Defaults"

Answer 9

I had a similar problem today - Unable to open Declarations in Java Editor using F3 or CTRL+Left Click.
Solution :
STEP1: Selected any java file in Eclipse Explorer.
STEP2: Clicked the - sign at the top of the Eclipse explorer. This compressed view of all modules in Eclipse.
STEP3: Right click on the empty space on the Eclipse Java Explorer and chose Refresh Option (F5) .
STPE4 : Happily the navigate options like F3, F2 , CTRL + Right Click all started working.

Answer 10

Solution :
1. Download and install this eclipse
eclipse-jee-2019-12-R-win32-x86_64
F3 shortcut key is worked for java file and Testng.xml.
i am able see package name and class name and also it navigate methods.