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Using EMF in Applets [message #421907]

Mon, 18 August 2008 08:48

Ksenya Lossiev

Messages: 3
Registered: July 2009

Junior Member

Hello,

Is it possible to use EMF in untrusted applets? The idea is to create
EMF-based instances in the applet client code, serialize to XML string and
send it using sockets to the server side, which in turn will deserialize
the XML into EMF objects. I wrote a test that within Applet constructs
some EMF object using our generated MyMsgFactory - I got security
exception below during EPackageRegistry init. Are there any solutions for
this? Thanks in advance!

java.lang.ExceptionInInitializerError
at org.eclipse.emf.common.EMFPlugin.<clinit>(EMFPlugin.java:121)
at
org.eclipse.emf.ecore.impl.EPackageRegistryImpl.createGlobal Registry(EPackageRegistryImpl.java:69)
at org.eclipse.emf.ecore.EPackage$Registry.<clinit>(EPackage.java:81)
at
mycomp.model.mysmsg.impl.MyMsgFactoryImpl.init(MyMsgFactoryI mpl.java:37)
at mycomp.model.mysmsg.MyMsgFactory.<clinit>(MyMsgFactory.java:27)
at mycomp.client.ClientApplet.init(ClientApplet.java:100)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.security.AccessControlException: access denied
(java.util.PropertyPermission
org.eclipse.emf.common.util.URI.encodePlatformResourceURIs read)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPropertyAccess(Unknown Source)
at java.lang.System.getProperty(Unknown Source)
at org.eclipse.emf.common.util.URI.<clinit>(URI.java:273)
... 8 more

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Re: Using EMF in Applets [message #421909 is a reply to message #421907]

Mon, 18 August 2008 09:30

Ed Merks

Messages: 33141
Registered: July 2009

Senior Member

This is a multi-part message in MIME format.
--------------070409070205060207020002
Content-Type: text/plain; charset=ISO-8859-15; format=flowed
Content-Transfer-Encoding: 7bit

Ksenya,

We've certainly not done a lot of testing with security turned on. It's
possible to create a security profile/policy that would allow access to
the small number of specific system properties used by the EMF runtime
during stand alone execution

org.eclipse.emf.common.util.URI.encodePlatformResourceURIs
org.eclipse.emf.common.util.URI.archiveSchemes
line.separator
org.eclipse.emf.ecore.EPackage.Registry.INSTANCE

Have a look at the related links at the end of

http://java.sun.com/javase/6/docs/api/

Specifically
< http://java.sun.com/javase/6/docs/technotes/guides/security/ permissions.html#PropertyPermission>

http://java.sun.com/javase/6/docs/technotes/guides/security/ permissions.html#PropertyPermission

Ksenya Kveler wrote:
> Hello,
>
> Is it possible to use EMF in untrusted applets? The idea is to create
> EMF-based instances in the applet client code, serialize to XML string
> and send it using sockets to the server side, which in turn will
> deserialize the XML into EMF objects. I wrote a test that within
> Applet constructs some EMF object using our generated MyMsgFactory - I
> got security exception below during EPackageRegistry init. Are there
> any solutions for this? Thanks in advance!
>
> java.lang.ExceptionInInitializerError
> at org.eclipse.emf.common.EMFPlugin.<clinit>(EMFPlugin.java:121)
> at
> org.eclipse.emf.ecore.impl.EPackageRegistryImpl.createGlobal Registry(EPackageRegistryImpl.java:69)
>
> at org.eclipse.emf.ecore.EPackage$Registry.<clinit>(EPackage.java:81)
> at
> mycomp.model.mysmsg.impl.MyMsgFactoryImpl.init(MyMsgFactoryI mpl.java:37)
> at mycomp.model.mysmsg.MyMsgFactory.<clinit>(MyMsgFactory.java:27)
> at mycomp.client.ClientApplet.init(ClientApplet.java:100)
> at sun.applet.AppletPanel.run(Unknown Source)
> at java.lang.Thread.run(Unknown Source)
> Caused by: java.security.AccessControlException: access denied
> (java.util.PropertyPermission
> org.eclipse.emf.common.util.URI.encodePlatformResourceURIs read)
> at java.security.AccessControlContext.checkPermission(Unknown Source)
> at java.security.AccessController.checkPermission(Unknown Source)
> at java.lang.SecurityManager.checkPermission(Unknown Source)
> at java.lang.SecurityManager.checkPropertyAccess(Unknown Source)
> at java.lang.System.getProperty(Unknown Source)
> at org.eclipse.emf.common.util.URI.<clinit>(URI.java:273)
> ... 8 more
>
>

--------------070409070205060207020002
Content-Type: text/html; charset=ISO-8859-15
Content-Transfer-Encoding: 8bit

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-15"
http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Ksenya,<br>
<br>
We've certainly not done a lot of testing with security turned on.

Ed Merks
Professional Support: https://www.macromodeling.com/

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