Attach the Source in Eclipse of a jar

Question

I added a Student jar into my Build Path in my eclipse like this-     Right click on the project- BuildPath- Configure Build   Path- Libraries- Add External Jars   There is one class named StudentTest in Student jar file  When I was debugging my code in eclipse  I stepped into that StudentTest class in the Student jar   And after that eclipse shows me like this-     The JAR file S  some location Student jar has no source attachment    You can attach the source by clicking Attach Source below   Now I am not sure how should I attach the source in my eclipse  And from where  Can anyone provide me step by step what I need to do   Update - I tried unzipping the Student jar and I got Student folder  And after that I tried pointing the source to Student folder But still I am not able to see the class properly so that I can debug it properly  it shows the same above behavior

User · Answer

Go back in to where you added the jar  I believe its the libraries tab  I don t have Eclipse open but that sounds right  to the left of the jar file you added there should be an arrow pointing right  click that and 3 or 4 options expand  one of them being the source file of the library  Click on that and click edit I think you can also double click it  then locate the file or folder on your hard disk  you probably have to click apply or okay and you re good to go  same with javadoc and i think the last one is native libraries  I don t pay much attention when I m in there anymore if you couldn t tell  That s what you were asking  right

User · Answer

Eclipse is showing no source found because there is no source available   Your jar only has the compiled classes   You need to import the project from jar and add the Project as dependency    Other option is to go to the   Go to Properties  for the Project  -  Java Build Path -  Libraries   select your jar file and click on the source   there will be option to attach the source and Javadocs

User · Answer

A  jar file usually only contains the  class files  not the  java files they were compiled from  That s why eclipse is telling you it doesn t know the source code of that class    Attaching  the source to a JAR means telling eclipse where the source code can be found  Of course  if you don t know yourself  that feature is of little help  Of course  you could try googling for the source code  or check wherever you got the JAR file from    That said  you don t necessarily need the source to debug

User · Answer

Download JDEclipse from http   java-decompiler github io  Follow the installation steps If you still didn t find the source  right click on the jar file and select  Attach Library Source  option from the project folder  as you can see below

User · Answer

I am using project is not Spring or spring boot based application  I have multiple subprojects and they are nested one within another  The answers shown here supports on first level of subproject  If I added another sub project for source code attachement  it is not allowing me saying folder already exists error   Looks like eclipse is out dated IDE  I am using the latest version of Eclipse version 2015-2019  It is killing all my time   My intension is run the application in debug mode navigate through the sub projects which are added as external dependencies  non modifiable

User · Answer

I have faced same problem and resolved it by using following scenario   1   First we have to determine which jar file s source code we want along with version number  For Example  Spring Core    4 0 6 RELEASE  2   open https   mvnrepository com  and search file with name  Spring Core    4 0 6 RELEASE   3   Now Maven repository will show the the details of that jar file  4   In that details there is one option  View All  just click on that  5   Then we will navigate to URL  https   repo1 maven org maven2 org springframework spring-core 4 0 6 RELEASE     6  there so many options so select and download  spring-core-4 0 6 RELEASE-sources jar       in our our system and attach same jar file as a source attachment in eclipse

User · Answer

This worked for me for Eclipse-Luna    Right Click on the   jar in the Referenced Libraries folder under your project  then click on Properties Use the Java Source Attachment page to point to the Workspace location or the External location to the source code of that jar

User · Answer

I faced the same issue and solved using the below steps  Go to Windows- preferences- Editors- File Associations  Here click on Add then type  class click on OK  again click on Add then type  classwithoughtsource click on OK  Now you will be able to see JadClipse option under Java section in Windows- Preferences  Please provide the path of jad exe file as shown below   Path for Decompiler-C  Users ahr Documents eclipse-jee-galileo-SR2-win32 jad exe Directory for temporary Files-C  Users ahr net sf jadclipse  click on Apply  Now you should be able to see the classfiles in proper format

User · Answer

Simply import the package of the required source class in your code from jar   You can find jar s sub packages in     Eclipse -- YourProject --  Referenced libraries --  yourJars --  Packages --  Clases   Like-- I was troubling with the mysql connector jar issue   the source attachment does not contain the source   by giving the path of source folder it display this statement  The source attachment does not contain the source for the file StatementImpl class   Then I just import the package of mysql connector jar which contain the required class   import com mysql jdbc      Then program is working fine

User · Answer

Use Java Source Attacher    It does what eclipse should do - a right click context menu that says  Attach Java Source     It automatically downloads the source for you and attaches it  I ve only hit a couple libraries it doesn t know about and when that happens it lets you contribute the url back to the community so no one else will have a problem with that library

User · Answer

I Know it is pretty late but it will be helpful for the other user  as we can do Job using three ways    as below 1 1  Atttach your source code using  i e  Right click on the project then properties --  Java build path--  attach your source in the source tab or you can remove jar file and attach the source in the libraries tab 2  Using eclipse source Analyzer In the eclipse market you can download the plugin java source analyzer which is used to attach the open source jar file s source code  we can achieve it after installing the plugin  by right click on the open source jar and select the attach source option  3  Using Jadclipse in eclipse you can do it last not the least  you can achieve the decompile your code using this plugin  it is similar way you can download the plugin from the eclipse market place and install in your eclipse  in jadclipse view you can see your  class file to decomplile source format note here you cannot see the comment and hidden things  I think in your scenario you can use the option one and option three  I prefer option three only if i want to the source code not for the debug the code  else i ll code the option 1  as i have the source already available with

[java] Attach the Source in Eclipse of a jar

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