Attach the Java Source Code

Question

I cannot for the life of me attach the java source code to eclipse so I can see the inner workings of the language  Not even something as simple as the String Class   when I run java -version this is what I have   java version  1 6 0 14  Java TM  SE Runtime Environment  build 1 6 0 14-b08  Java HotSpot TM  Client VM  build 14 0-b16  mixed mode  sharing    I am downloading the java souce from  http   download java net jdk6 source   And in eclipse when I attach it It says   The JAR file  C  Program Files Java jre6 jdk-6u14-fcs-src-b08-jrl-21 may 2009 jar   has no source attachment    What am I doing wrong

User · Answer

To attach JDK source so that you refer to Java Source Code for code look-up which helps in learning the library implementation and sometimes in debugging, all you have to do is:

In your Eclipse Java Project > JRE Reference Library locate rt.jar. Right click and go to Properties:

Select "Java Source Attachment" on the right and to the left select "External Location" and click on "External File" Button and locate "src.zip" file in your $JAVA_HOME path in my case for my windows machine src.zip location is: C:/Program Files/Java/jdk1.7.0_45/src.zip.

You are done now! Just Ctrl + click on any Java library Class in your project code to look-up the source code for the java class.

User · Answer

Answer For Eclipse 2019 With ScreenShots   Step 1  Window -  Preferences -  Java -  Installed JREs      Step 2  Select Currently used JRE  now Edit option will get enabled  Click on edit option      Step 3  Select rt jar from JRE systems library  click on corresponding drop down to expand      Step 4  Select Source attachment none  Click on Source Attachment Button  Source attachment configuration window will appear  Select external location      Step 5  Select src zip file from jdk folder  say ok ok finish

User · Answer

enter image description here  if you are add jre and jkd path  remove jre install path  keep jdk path is work

User · Answer

What worked for me  with JDK7  was the following    Download the openjdk-xy-sources jar from GrepCode  rename the file to src zip  copy src zip to the root folder of the JRE JDK added to eclipse  the one with bin and lib folders in it  restart eclipse   Alternatively  if you don t want to write to your JDK folder  you could also attach src zip to  at least  rt jar in eclipse in the Window   Preferences menu in Java   Installed JREs   If you re not comfortable with downloading the sources from GrepCode  you could also get them from openJDK directly  This requires requires a bit more effort  though  Replace step one above by the following steps    Download the JDK sources from here  extract all folders from the zip file s  openjdk jdk src share classes  folder  create a file src zip and add these folders to it  copy src zip to the root folder of the JRE JDK added to eclipse  the one with bin and lib folders in it  restart eclipse   A third alternative to acquire src zip is to download the unofficial OpenJDK builds from here  The src zip is contained within the downloaded zip

User · Answer

Just remove the JRE in Preferences Java Installed JRE and add the folder of your JDK  If you just add JDK but still leave JRE it won t work

User · Answer

Normally  if you have installed the JDK6u14  eclipse should detect it and declare it automatically in its  installed JRE  list   If not  you can add that JDK through  Windows Preferences   Java  gt  Installed JREs   Just point to the root directory of your JDK installation  it should include the sources of the JDK  src zip   automatically detected and attached to rt jar by eclipse

User · Answer

issue resolved here     Windows Preferences   Java   Installed JREs   then set update JRE HOME   C  Program Files Java jdk1 8 0 221 jre  should try this

User · Answer

You need to attach java sources which comes with JDK C  Program Files Java jdk1 8 0 71 src zip     Steps   Source  link     Select any Java project Expand Referenced libraries Select any JAR file  in our case rt jar which is Java runtime Right click and go to properties Attach source code by browsing source path

User · Answer

Easy way that just worked for me     Check if you have a jdk installed  it is usually in  Program Files Java   if you don t have one  install it    Link it to eclipse  In Preferences --  Java --  Installed JREs remove the JRE installed and add the JDK    Then the project will detect it and add the new libraries from the JDK  At the end of this process it looks like the screenshot I attach

User · Answer

The option provided by praveenak  can also be applied to any other jar files with source file provided  For example  for JavaFx  we right click jfxrt jar  select  Properties  and enter jdk1 8 0 05 javafx-src zip for  Path  under External location

User · Answer

Old question  be here s what I ended up using Java Source Attatcher plugin   http   marketplace eclipse org content java-source-attacher  U85j4rF-N7s  It can provide source for different opensource projects  One weird thing thou  if you have libraries under libs folder  you cannot attach from there  but you need to attach source clicking on jar displayed under  Libraries from external

User · Answer

The easiest way to do this  is to install a JDK and tell Eclipse to use it as the default JRE   Use the default install    from memory    Open Window -  Prefences   Select Installed Java runtimes  and choose Add   Navigate to root of your JDK   Programs    Java  and click Ok   Then select it to be the default JRE  checkmark    After a workspace rebuild  you should have source attached to all JRE classes

User · Answer

Hold ctrl key and then click on class of which you want to see the inner working  for ex  String  then you will find there button  quot Attach Source quot   Click on it  Then click on External Folder  Then browse to your jdk location  per instance C  Program Files Java jdk1 6 0  That s it

User · Answer

You don t necessarily need to add the source  but you rather may need to remove a JRE that does not have the source attached   On looking at the  installed JRE s  I saw that my JDK was setup properly with source  but the default JRE on the machine had no sources  Eclipse was defaulting to that when looking for source   I just used the remove button to expel the JRE  leaving my JDK  I then hit F3 and the source was there  Yeah

[eclipse] Attach the Java Source Code

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