How do I add the Java API documentation to Eclipse

Question

I have downloaded Java API documentation from http   www oracle com technetwork java javase downloads index html docs and have supposedly attached it to Eclipse using the      Window- Preferences- Java- Installed   JREs- Edit-  Select rt jar - Javadoc   Location   And the location has been accepted and  Validates  just fine  However  for the life of me  I can t get Eclipse to show the Javadocs in the tooltip whene I hover over an item  for example in the declaration of an ArrayList   I have also restarted Eclipse in attempts to get it to work  What am I doing wrong

User · Answer

if you are using maven   mvn eclipse eclipse -DdownloadSources true  -DdownloadJavadocs true

User · Answer

I have had a similar issue and looks like that the culprit was the space in the path to the archive  e g   C  Program Files java jdk   After moving the archive to another directory without spaces in path it started to work

User · Answer

Ensure  Preferences  -   Java  -   Editor  -   Hovers  -   Combined Hover  is checked

User · Answer

Likely a problem with the path that you specified in Javadoc Location  It is pretty finicky  Make sure that it points at the root of where the javadoc starts  It could be a few directories down in the zip you ve downloaded

User · Answer

I just had to dig through this issue myself and succeeded   Contrary to what others have offered as solutions  the path to my happy ending was directly correlated to JavaDoc   No  src zip  files necessary   My trials and tribulations in the process involved finding the CORRECT JavaDoc to point at   Pointing a Java 1 7 project at Java 8 Javadoc does NOT work    Even if  jre8  appears to be the only installed JRE available    Thus  I beat my head against the brick wall unnecessarily   Window   Preferences   Java   Installed JREs  If the JRE of your project is not listed  as happened to me when I migrated a jre7 project to a new jre8 workspace   you will need to add it here   Click  Add     and point your Workspace at the desired jre folder   Mine was C   Program Files Java jre7    Then  Edit     the now-available JRE  select the rt jar  and click  Javadoc Location     and aim it at the correct javadoc location   For my use   For jre7 -- http   docs oracle com javase 7 docs api  For jre8 -- http   docs oracle com javase 8 docs api   Voila  hover tooltip javadoc is re-enabled   I hope this helps anyone else trying to figure this problem out

User · Answer

For OpenJDK 8 on Linux see  https   askubuntu com questions 755853 how-to-install-jdk-sources  The way that worked for me is    The default src zip is a symbolic link pointing to a non-existing folder     sudo apt-get install openjdk-8-source this adds this folder locate  src zip  Eclipse  Window -- gt  Preferences -- gt  Java -- gt   Installed JREs   edit and point to src zip  or open any JRE class like for example HashMap and attach source    You should now see the JavaDoc when opening JRE classes via Ctrl Shift t  previously this was not possible  Eclipse may have got a docs from the default URL on mouse over methods but this requires a stable internet connection

User · Answer

I went through the same problem and I did not find some of the above answer useful because they are old and with new JDK 1 8   documentation section has  been moved to src zip in JDK folder  C  Program Files Java jdk1 8 0 101      Now I tried everything from above and it was showing me the same problem if I press ctrl and click on  for example String or System  in my program I get the Source not found   Now you can do this  go to  the folder where JDK  C  Program Files Java jdk1 8 0 101  is installed and try to unzip src zip  Here you might face an issue as sometime due to administrative rights on this folder it would not allow you to unzip this src zip  For solving the issue   copy src zip and paste in any other folder   example Desktop  and then create a folder src and unzip in it  Now copy this folder back to JDK 1 8 folder   C  Program Files Java jdk1 8 0 101      Now just go to eclipse and open any program and press ctrl and click on any external objects or anything  for example String or System   You will get Source not found   Now Click Attach source -  External Location -  External Folder and add your src location  C  Program Files Java jdk1 8 0 101 src   Now you are good to go   I tried and it worked for me   All the above folder location are from my system   so It might be different for you

User · Answer

Instead of attaching JavaDoc attach JDK src zip

User · Answer

Eclipse doesn t pull the tooltips from the javadoc location  It only uses the javadoc location to prepend to the link if you say open in browser  you need to download and attach the source for the JDK in order to get the tooltips   For all the JARs under the JRE you should have the following for the javadoc location  http   java sun com javase 6 docs api   For resources jar  rt jar  jsse jar  jce jar and charsets jar you should attach the source available here

User · Answer

Go to your JDK installation   C  Program Files Java jdk1 8 0 66 for me   Unzip the src zip file  becomes C  Program Files Java jdk1 8 0 66 src  for me   In the Eclipse editor window  CTRL   Click on a java lang library class   something like String   Eclipse will complain Source not found and tell you that you don t have the source  Click Attach source -  External Location -  External Folder  Find your source folder  C  Program Files Java jdk1 8 0 66 src  for me   Click OK -  OK  Enjoy

User · Answer

To use offline Java API Documentation in Eclipse  you need to download it first  The link for Java docs are  last updated on 2013-10-21    Java 6 Page  http   www oracle com technetwork java javase downloads jdk-6u25-doc-download-355137 html Direct  http   download oracle com otn-pub java jdk 6u30-b12 jdk-6u30-apidocs zip  Java 7 Page  http   www oracle com technetwork java javase documentation java-se-7-doc-download-435117 html  Java 8 Page  http   www oracle com technetwork java javase documentation jdk8-doc-downloads-2133158 html  Java 9 Page http   www oracle com technetwork java javase documentation jdk9-doc-downloads-3850606 html   Extract the zip file in your local directory  From eclipse Window -- gt  Preferences -- gt  Java -- gt   Installed JREs  select available JRE  jre6  C  Program Files  x86  Java jre6 for instance  and click Edit  Select all the  JRE System libraries  using Control A  Click  Javadoc Location  Change  Javadoc location path   from  http   download oracle com javase 6 docs api   to  file  E  Java docs api      It must work as it works for me  I don t need Internet connection to view Java API Documentation in Eclipse anymore

User · Answer

Old question  but I had current problems with this issue  So I provide you my solution  Now the sources and javadocs are inside the jdk  So  unzip your jdk version You can see that contanins a  src zip  file  Here are your needed sources and doc files  Follow the path  Window- Preferences- Java- Installed JREs-  select your jre jrd and press  Edit  Select all  jar files  and press Source Attachement  Select the  External File     button  and point it to src zip file   Maibe a restart to Eclipse is needed   normally not  Now you should see the docs  and also the sources for the classes from jdk

User · Answer

Choose one class you want to view its documentation and press Ctrl click over it  the Javadoc page will inform you that there is no Javadoc file attached and bellow will see a button named  Attach File   Press that button and browse to the directory where JDK is installed  normally for Win is C  Program files Java jdk xxx and inside this folder there is a src zip file - sleect it and press OK and all is done - you already have Javadoc attached

User · Answer

For offline Javadoc from zip file rather than extracting it  Why this approach  This is already answered which uses extracted zip data but it consumes more memory than simple zip file  Comparison of zip file and extracted data  jdk-6u25-fcs-bin-b04-apidocs zip  --- gt    57 MB after extracting this zip file  --- gt    264 MB    So this approach saves my approx  200 MB  How to use apidocs zip   1 Open Windows - gt  Preferences    2 Select jre from Installed JREs then Click Edit       3 Select all  jar files from JRE system libraries then Click Javadoc Location       4 Browse for apidocs zip file for Archive path and set Path within archive as shown above  That s it  5 Put cursor on any class name or method name and hit Shift   F2

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