[Building Sakai] Running Java Applet from Resources

Tue Nov 27 12:18:06 PST 2012

Generally, Java applets are embedded in an HTML page.  There is nothing 
to prevent the creation of a web page in the Resources tool that 
contains an <embed> tag (or similar).  Depending on how Sakai is 
configured, the page will either download or be launched in it's own 
window/tab.

Applets have their own security mechanism.  Generally, they are not 
allowed to access the local file system.

The big questions is, what do you want to do with the Applet? Accessing 
Sakai functionality can be done via web services or the Entity Broker, 
just like any other remote application, but there are limits to what can 
be done this way.  What you can't do from an Applet is access Sakai 
Kernel functionality directly.  That said, simple simulations, etc. 
should work.

- Mark Norton

On 11/27/2012 3:10 PM, Neal Caidin wrote:
> Hi Kelly,
>
> Did you ever get a response to your inquiry?
>
> I would not think Sakai would be set up to allow Java applets to run 
> from the Resources area, that seems like it would be a potential 
> security issue to me. But I'm not the expert.
>
> Cheers,
>
> Neal Caidin
>
> Sakai CLE Community Coordinator
> nealcaidin at sakaifoundation.org <mailto:nealcaidin at sakaifoundation.org>
> Skype: nealkdin
> AIM: ncaidin at aol.com <mailto:ncaidin at aol.com>
>
>
>
>
>
> On Oct 17, 2012, at 5:53 PM, "Geng, Kelly" <gengx at miamioh.edu 
> <mailto:gengx at miamioh.edu>> wrote:
>
>> Hi Dev list,
>> We had a faculty trying to run an Java Applet script from her 
>> Resources in Sakai. All the dependent class files are under the same 
>> directory as the launching html file. She got an "Incompatible magic 
>> value" error upon launching. Looking at the log it seems like 
>> everything went well up until the application started to connect our 
>> CAS server. I copied the log below(I red-highlighted our CAS server 
>> URL) and am wondering whether anyone has seen this before and know 
>> how to work around it. She claimed that the same script was running 
>> last semester (when we didn't have CAS and was on 2.7.x instead of 
>> current 2.8.x version of sakai).
>> Thanks,
>> Kelly
>> Miami University
>> network: 
>> Connectinghttps://niihka.muohio.edu/access/content/group/ffbe4f38-c9a5-46cd-9acb-b7d4a712f078/Modules/Module%20-%20Low%20level%20programming/simulation/NEWCPUSim.classwith 
>> proxy=DIRECT
>> network: Connectinghttp://niihka.muohio.edu:443/with proxy=DIRECT
>> ...
>> security: Loading certificates from Deployment session certificate store
>> security: Loaded certificates from Deployment session certificate store
>> security: Checking if certificate is in Deployment denied certificate 
>> store
>> network: 
>> Connectinghttps://niihka.muohio.edu/access/content/group/ffbe4f38-c9a5-46cd-9acb-b7d4a712f078/Modules/Module%20-%20Low%20level%20programming/simulation/NEWCPUSim.classwith 
>> cookie "__utma=40004414.470991547.1342969029.1348793119.1348840212.4; 
>> __utmz=40004414.1342969029.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); 
>> SaneID=134.53.7.196-1348498927383600; 
>> GB2TOKEN=9acaf8db--a9a9-eaff730025a9-43122cb01247e7684dd5c644872ba5bd; SESSID=OVZCMTIyNTkxOA=="
>> network: 
>> Serverhttps://niihka.muohio.edu/access/content/group/ffbe4f38-c9a5-46cd-9acb-b7d4a712f078/Modules/Module%20-%20Low%20level%20programming/simulation/NEWCPUSim.classrequesting 
>> to set-cookie with 
>> "JSESSIONID=eade0697-c823-454b-9c6a-bc93a97e.Niihka-03; Path=/; 
>> Secure; HttpOnly"
>> network: Cache entry not found 
>> [url:https://niihka.muohio.edu/sakai-login-tool/container, version: null]
>> network: 
>> Connectinghttps://niihka.muohio.edu/sakai-login-tool/containerwith 
>> proxy=DIRECT
>> network: Connectinghttp://niihka.muohio.edu:443/with proxy=DIRECT
>> security: Loading certificates from Deployment session certificate store
>> security: Loaded certificates from Deployment session certificate store
>> security: Checking if certificate is in Deployment denied certificate 
>> store
>> network: 
>> Connectinghttps://niihka.muohio.edu/sakai-login-tool/containerwith 
>> cookie "__utma=40004414.470991547.1342969029.1348793119.1348840212.4; 
>> __utmz=40004414.1342969029.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); 
>> SaneID=134.53.7.196-1348497383600; 
>> GB2TOKEN=9acaf8db-4b95-a9a9-eaff730025a9-43122cb01247e7c644872ba5bd; 
>> SESSID=OVZCUVZDMTIyxOA=="
>> network: 
>> Serverhttps://niihka.muohio.edu/sakai-login-tool/containerrequesting 
>> to set-cookie with "JSESSIONID=55883783-c7fa-4cb0.Niihka-03; Path=/; 
>> Secure; HttpOnly"
>> network: Cache entry not found 
>> [url:https://muidp.muohio.edu/cas/login?service=https%3A%2F%2Fniihka.muohio.edu%2Fsakai-login-tool%2Fcontainer, 
>> version: null]
>> network:Connectinghttps://muidp.muohio.edu/cas/login?service 
>> <https://muidp.muohio.edu/cas/login?service=https%3A%2F%2Fniihka.muohio.edu%2Fsakai-login-tool%2Fcontainer>=https%3A%2F%2Fniihka.muohio.edu%2Fsakai-login-tool%2Fcontainer 
>> <https://muidp.muohio.edu/cas/login?service=https%3A%2F%2Fniihka.muohio.edu%2Fsakai-login-tool%2Fcontainer>with 
>> proxy=DIRECT
>> network: Connectinghttp://muidp.muohio.edu:443/with proxy=DIRECT
>> security: Loading certificates from Deployment session certificate store
>> security: Loaded certificates from Deployment session certificate store
>> security: Checking if certificate is in Deployment denied certificate 
>> store
>> network: 
>> Connectinghttps://muidp.muohio.edu/cas/login?service=https%3A%2F%2Fniihka.muohio.edu%2Fsakai-login-tool%2Fcontainerwith 
>> cookie "JSESSIONID=1ABB2411E999F13B9A1C0E8; 
>> __utma=40004414.470991547.1342969029.1348793119.1348840212.4; 
>> __utmz=40004414.1342969029.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); 
>> SaneID=134.53.7.196-1348498927383600; SESSID=OVZCUVZDMTkxOA=="
>> network: 
>> Serverhttps://muidp.muohio.edu/cas/login?service=https%3A%2F%2Fniihka.muohio.edu%2Fsakai-login-tool%2Fcontainerrequesting 
>> to set-cookie with "JSESSIONID=6C4881D27BF080572CFE3; Path=/cas; Secure"
>> network: Cache entry not found 
>> [url:https://niihka.muohio.edu/access/content/group/ffbe4f38-c9a5-46cd-9acb-b7d4a712f078/Modules/Module%20-%20Low%20level%20programming/simulation/, 
>> version: null]
>> basic: error: Incompatible magic value 168430090 in class file NEWCPUSim.
>> java.lang.ClassFormatError: Incompatible magic value 168430090 in 
>> class file NEWCPUSim
>> at java.lang.ClassLoader.defineClass1(Native Method)
>> at java.lang.ClassLoader.defineClass(Unknown Source)
>> at java.security.SecureClassLoader.defineClass(Unknown Source)
>> at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
>> at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
>> at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
>> at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
>> at java.lang.ClassLoader.loadClass(Unknown Source)
>> at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
>> at sun.plugin2.applet.Plugin2Manager.initAppletAdapter(Unknown Source)
>> at 
>> sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown 
>> Source)
>> at java.lang.Thread.run(Unknown Source)
>> Ignored exception: java.lang.ClassFormatError: Incompatible magic 
>> value 168430090 in class file NEWCPUSim
>> basic: Dialog type is not candidate for embedding
>> basic: Removed progress listener: 
>> sun.plugin.util.ProgressMonitorAdapter at 130fa6f
>> security: Reset deny session certificate store
>> basic: Dialog type is not candidate for embedding
>> _______________________________________________
>> sakai-dev mailing list
>> sakai-dev at collab.sakaiproject.org 
>> <mailto:sakai-dev at collab.sakaiproject.org>
>> http://collab.sakaiproject.org/mailman/listinfo/sakai-dev
>>
>> TO UNSUBSCRIBE: send email 
>> tosakai-dev-unsubscribe at collab.sakaiproject.org 
>> <mailto:sakai-dev-unsubscribe at collab.sakaiproject.org>with a subject 
>> of "unsubscribe"
>
>
>
> _______________________________________________
> sakai-dev mailing list
> sakai-dev at collab.sakaiproject.org
> http://collab.sakaiproject.org/mailman/listinfo/sakai-dev
>
> TO UNSUBSCRIBE: send email to sakai-dev-unsubscribe at collab.sakaiproject.org with a subject of "unsubscribe"

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://collab.sakaiproject.org/pipermail/sakai-dev/attachments/20121127/b17cd432/attachment.html 