How to view JDK external documentation in IntelliJ IDEA?

Question

The shortcut for this action is Shift+F1 but it is always grayed out even I have pointed JDK documentation path to the docs folder (the docs folder

Answer 1

Java 10 Documentation path

Got to File -> Project Structure Choose External URL

Below Link works Fine... THe default one does'nt work

https://docs.oracle.com/javase/10/docs/api/

Answer 2

For IntelliJ Idea: Call "Project Structure" (Ctrl+Shift+Alt+S), go to "Platform Setting - SDKs", choose "Documentation Path" tab on the right, then add url of JavaDoc (http://docs.oracle.com/javase/7/docs/api/) to your project

Answer 3

You can add the external Javadocs API link as shown below:

• Go to File > Project Structure...
• Then select SDKs (under Platform Settings)
• Go to Documentation Paths tab
• Select Specify URL button and add the link for JDK 11 API docs (https://docs.oracle.com/en/java/javase/11/docs/api/)

Answer 4

I understand the question as follows:

You would like to see javadocs of classes that are not within JDK. I am a bit uncertain because CrazyCoder's reply is talking about JDK specific javadocs.

I am using Macos 10.8.4 and Intellij 11.1.5

The project I am working on is a mvn based project with many modules which have complex dependencies.

Let me take a concrete example to explain what I did, I am sure it can be reproduced for others: apache sshd

I downloaded the javadoc from maven central stored it stored it somewhere. In intellij I went to the module settings (shortcut F4) and the to Libraries in the sidebar. Maven pulls all dependencies automagically and I can find sshd there. The right side then shows Classes, Sources and JavaDocs. The JavaDocs part in my case had a path linked in that pointed to my local m2 directory. However the directory did not contain the javadoc jar file. So I thought how do I get it:

mvn dependency:resolve -Dclassifier=javadoc

Taken from here

However this failed for because we do not have some javadocs in our nexus (I guess, not sure).

So I ended up linking the file that I downloaded manually in as a javadoc link and this then allown me to use Shift+F1 for the javadoc to open in my standard browser.

Maybe others can elaborate on how to get this done with mvn. I did not have the time to further investigate.

Answer 5

You need to specify the docs/api subdirectory of the unpacked documentation or use https://docs.oracle.com/javase/8/docs/api/ URL for the external documentation feature to work.

File -> Project Structure... then here :

Answer 6

Posting this here in case you're like me and don't necessarily want javadocs, but rather the documentation inside your IDE.

In my situation, I had downloaded OpenJDK 11 and wasn't able to get documentation inside IntelliJ. Instead I was getting decompiled code.

What helped me was the answer at https://stackoverflow.com/a/38413439 i.e.

1. Go to File > Project Structure > SDKs > Sourcepath > '+' on the right side.
2. Navigate to your JDK (I'm on Ubuntu so it was located under /usr/lib/jvm/openjdk-11/).
3. Select the src.zip (for me, /usr/lib/jvm/openjdk-11/lib/src.zip).
4. Click OK > OK (to "Choose Roots" pop-up) > OK (to Project Structure)

Let Intellij index and it should be available in your IDE.