When I type something like Integer.toString and press "Ctrl+Space", it gives me the completion hint of Integer.toString(int arg0, int arg1), but I want it to write Integer.toString(int i, int radix) so that I know that the first argument is the number and the second one is the radix. Can you install some plugin that does that, instead of showing these unintuitive "arg0", "arg1" parameter names?
As daniu pointed out in the comments, Eclipse uses the javadoc to get the information. The argument names simply don't exist in the compiled JRE. I can confirm that in my workspace, javadoc is attached but no sources and the completion shows the correct names.
Eclipse should add the information on it's own, but if it does not for some reason, you can add it yourself.
In your project folder, you will see "JRE System Library [your Java version]". Inside that, there are a bunch of jars. Right click on each one and got to Properties -> Javadoc Location. There you can input the javadoc location for the jar. In the case of Java 8, this is https://docs.oracle.com/javase/8/docs/api/ for all of them. If you use a different version, use a search engine of your choice to find the correct javadoc.
Is it possible to auto-generate Javadoc comments for each method in one class in Eclipse (Indigo)?
There may be a better approach, but if you expand the class in Package Explorer, select the methods you would to document, then right-click and select "Source -> Generate Element Comment" that will add comments for all the selected methods.
The other choice might be to double click on the name of the method, then ALT+Shift+J shortcut.
There also exist external tools for javadoc generation, for example JAutodoc eclipse plugin. It is possible to customize it's templates to suit your expectation.
In Eclipse you have possiblity to create java doc template, and then just what need to do is type java-dock block /** above the element you want to document.
In case when the code is generate, the templates also generate the java-doc.
All this and even more you will be able to configure in Window -> Preferences, Java -> Code Style -> Code Templates -> Comments
When using the standard api, for example the collections library, the predictive text options windows also shows the comments on class/methods.
however when I do the same style comments on my own code - the open project I am working on (code completion works correctly, just no comments appear), and then reference it later. These comments are not displayed. I get the correct code completion options, just none of the associated comments/documentation. They are not in jar, they are source files, that are built using maven into a war file.
Is there a setting I need to enable in eclipse, or do I need to set up javadoc or something ?
How embarassing, you to have to specify double asterix at the begininng of comment to create a javdoc comment
/**
* read the documentation before asking questions on stackoverlow
*/
If the class is part of a jar you need to associate the javadoc jar or path. You can right click on the jar in eclipse and specify the path in the properties dialog.
I dislike the default Javadocs generated for me when I create a Class or methods, especially the #author variable, which is the current system username on my windows box.
I would like to change it. Is this possible?
Check Preferences / Java / Code Style / Code Template
Section Comment / Type
You can replace the author tag by whatever value you need and it will have an effect on new generated classes.
However, if the template is fine, but the value referenced buy the author tag is not, see this SO question:
${user} uses the value of the user.name environment variable; therefore, you can pass -Duser.name=My Name in eclipse.ini to override it.
Or, if you prefer, you can modify the shortcut to point to:
C:/java/eclipse/eclipse.exe -vmargs -Duser.name="cleverUserNameToUseInSourceCode"
MacOs: Aram Kocharyan mentions the eclipse.ini is in Eclipse.app/Contents/MacOS/ if you right click and go Show Package Content.
ZendStudio: rofflox comments the file is named ZendStudio.ini and is found in Applications/Zend Studio.app/Contents/MacOS/.
Look at Window -> Preferences -> Java -> Editor -> Templates.
Spring Tool Suite (popular Eclipse customization for Spring development) uses STS.ini. On Windows I found it in the same dir as an app launch executable.
To use a Git username and email you can use the variables ${name:git_config(user.name)} and
${email:git_config(user.email)}.
You should consider using JAutodoc, which is a very useful plugin for Eclipse. The parametrization is way more advanced than the standard Eclipse generation.
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?
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.
(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
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.
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._
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.
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.
Another solution which worked for me is to go to Java--> Appearence --> Type Filters and do disable all
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!
If you have installed Google Toolbar for IE, may be you can face the same problem. Because, the toolbar capture the shortcut ctrl+Space.
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".
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.
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.
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
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... :)
Running STS on Java Spring Boot projects, here's what works for me :
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 & Close
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.
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
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...
I ran into this and it ended up being I was opening the file with the text editor and not the java editor.
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.
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.
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.
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.
We can change the settings as per our requirement.
Suppose we want to make java proposal as highest priority we need to do changes as shown below.
Windows > Preferences > Java > Editor > Content Assist > Advanced
Choose Java proposal and click on up button
For me in Sep 2021 it was an odd Eclipse bug. I had a multi-line string inside an annotation in my Class. This caused just that particular class to fail when trying to code complete (even though the class compiled just fine).