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Study note on h:graphicImage

 
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To add some notes to Paul Statham's notes (https://bitbucket.org/paulstat/oracle-jsf-expert-1z0-896/wiki/Home), h:graphicImage is important to this exam.
1. Assume there is a resources/images folder in the war file.
  <h:graphicImage value ="resources/images/mypicture.jpg"/> where value is relative to the context path root.  
  <h:graphicImage value = "/resources/images/mypicture.jpg"/> still works
    or,
   <h:graphicImage library="images" name="mypicture.jpg"/>
   or
   <h:graphicImage value ="#{resource['images:mypicture.jpg']}"
2. Assume there is image folder in the war file. Url should start with /. This url is a relative path to the context path root.
   <h:graphicImage url="/image/mypicture.jpg"/>
3. Assume there is resources/images folder in the war file.
  <h:graphicImage url="/resources/images/3_image.jpg"/>


Context path root is the root of the war file.
For example in fileupload example of chapter 13 of JSF core book
fileupload.war is extracted in this structure:

WEB-INF (cannot be accessed directly by users from a browser)
  - classes folder
  - lib folder
  - web.xml
  -faces-config.xml
resources (folder) *1
  - images (folder)
       - 3_images.jpg
       -mypicture.jpg (can be accessed by localhost:8080/fileupload/faces/resources/images/mypicture.jpg) *2
image (folder)
 - mypicture.jpg
upload (folder) (at the same level as the context path root)
 -2_image.jpg (can be accessed by localhost:8080/fileupload/faces/upload/2_image.jpg)
 - uploadimage.xhtml *3
index.xhtml (at the same level as the context path root)
next.xhtml
*1 resources, image, upload folders index.xhtml, next.xhtml can be directly accessed by a browser since they are outside WEB-INF.
*2  context path root is fileupload/faces
*3 From uploadimage.xhtml, if we need to access 2_image, we need to use the url relative to context path root: <h:graphicImage url="/upload/2_image.jpg"/> or <h:graphicImage value="/upload/2_image.jpg"/>
not <h:graphicImage value ="2_image.jpg"/> (not relative to the context root).
next.xhtml

Knowing these is good enough for the exam.
 
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