[rules-dev] Drools in Google App Engine
Rafael Ribeiro
rafaelri at gmail.com
Tue Nov 10 08:21:18 EST 2009
Paul,
Have you managed to get it running? I did some changes to
ChainedProperties.java and managed to get it working but sincerely I dont
know if I broke something (that I could not detect in my humble tests).
But there is one thing that I guess will never work (unless GAE whitelists
more stuff) that is using time constraints on events cause it ends up trying
to use ScheduledThreadPoolExecutor.
best regards,
Rafael Ribeiro
I've attached my
http://old.nabble.com/file/p26283304/ChainedProperties.java
ChainedProperties.java modified file.
Paul Browne wrote:
>
> Ok, for the moment I'll use either AspectJ or modify the source (i.e. it
> can
> get pasts the File.exists() so that I can identify all of points that App
> engine doesn't like ....
>
> On Fri, May 15, 2009 at 9:16 AM, Geoffrey De Smet
> <ge0ffrey.spam at gmail.com>wrote:
>
>> I am not surprised that File.exists() fails, but why does
>> getClass().getResourceAsStream() fail?
>>
>> In Applets, the latter should work:
>> http://java.sun.com/docs/books/tutorial/uiswing/components/applet.html
>> chapter Using Images in a Swing Applet.
>>
>> Because getClass().getResourceAsStream() only looks in the classpath,
>> I see not reason that Google App Engine would block it.
>>
>> With kind regards,
>> Geoffrey De Smet
>>
>>
>> Paul Browne schreef:
>>
>>> Geoffrey,
>>> The stack exception below is Drools looking for the conf file *before*
>>> it
>>> even looks for the DRL file. However *any* file IO is blocked - so even
>>> it
>>> Drools got past the File.exists(), it's likely to throw another
>>> SecurityException at the getClass().getResourceAsStream for the DRL
>>> file.
>>> I say 'likely' as 3 months ago I was trying to get version 4 of Drools
>>> running in an Applet environment (has similar security constraints), and
>>> worked my way through the source code to resolve the security
>>> exceptions. In
>>> that case, getClass().getResourceAsStream was blocked.
>>> Any suggestions?
>>> Thanks
>>> Paul
>>>
>>>
>>> On Wed, May 13, 2009 at 4:51 PM, Geoffrey De Smet <
>>> ge0ffrey.spam at gmail.com <mailto:ge0ffrey.spam at gmail.com>> wrote:
>>>
>>> Does this File.exists() usage occur even if your DRL is a classpath
>>> resource and fetched with getClass().getResourceAsStream()?
>>>
>>> With kind regards,
>>> Geoffrey De Smet
>>>
>>>
>>> Paul Browne schreef:
>>>
>>> Folks,
>>>
>>> Are there any plans to tweak Drools to allow it to run in a
>>> security constrained environment such as Google App Engine or
>>> Applets? I know some of the other JBoss.org projects have this
>>> on the 'todo' list.
>>>
>>> When I try to load a simple web application using drools into
>>> the Google App Engine, I get the error below.The app itself is
>>> the sample 8 from the following web page, but tweaked according
>>> to the Google 'howto' to get it up and running in the app
>>> engine; http://code.google.com/p/red-piranha/
>>>
>>> My understanding of the problem is that drools is using File
>>> access to check if the configuration file exists the first time
>>> it is run. This is constrained in App Engine - just like the
>>> J2EE spec says it should be (although most other app servers
>>> allow you to get away with this!). I know that if I tweak the
>>> source code there will be other points where similar file access
>>> is required.
>>>
>>> While not trivial, would it be possible to add a one-line check
>>> for that the user has permission to do file.io <http://file.io/>
>>> <http://file.io <http://file.io/>> before calling File.Exists
>>>
>>> (the alternative , of catching and ignoring the
>>> AccessControlException is ugly!). The hardest part of this is
>>> that the check would need to be added at multiple points in the
>>> Drools source code.
>>>
>>>
>>> Any thoughts / comments/ suggestions?
>>>
>>> Paul
>>>
>>> www.firstpartners.net/blog <http://www.firstpartners.net/blog>
>>> <http://www.firstpartners.net/blog>
>>>
>>>
>>>
>>> WARNING: java.security.AccessControlException: access denied
>>> (java.io.FilePermission /home/paul/drools.rulebase.conf read)
>>> 13-May-2009 09:04:16
>>> com.google.apphosting.utils.jetty.JettyLogger warn
>>> WARNING: Nested in javax.servlet.ServletException:
>>> java.security.AccessControlException: access denied
>>> (java.io.FilePermission /home/paul/drools.rulebase.conf read):
>>> java.security.AccessControlException: access denied
>>> (java.io.FilePermission /home/paul/drools.rulebase.conf read)
>>> at
>>>
>>>
>>> java.security.AccessControlContext.checkPermission(AccessControlContext.java:323)
>>> at
>>>
>>>
>>> java.security.AccessController.checkPermission(AccessController.java:546)
>>> at
>>>
>>> java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
>>> at
>>>
>>>
>>> com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkPermission(DevAppServerFactory.java:76)
>>> at
>>> java.lang.SecurityManager.checkRead(SecurityManager.java:871)
>>> at java.io.File.exists(File.java:731)
>>> at
>>>
>>>
>>> org.drools.util.ChainedProperties.loadProperties(ChainedProperties.java:225)
>>> at
>>>
>>> org.drools.util.ChainedProperties.<init>(ChainedProperties.java:59)
>>> at
>>>
>>> org.drools.util.ChainedProperties.<init>(ChainedProperties.java:31)
>>> at
>>>
>>> org.drools.util.ChainedProperties.<init>(ChainedProperties.java:25)
>>> at
>>>
>>> org.drools.RuleBaseConfiguration.init(RuleBaseConfiguration.java:174)
>>> at
>>>
>>> org.drools.RuleBaseConfiguration.<init>(RuleBaseConfiguration.java:133)
>>> at
>>>
>>> org.drools.common.AbstractRuleBase.<init>(AbstractRuleBase.java:147)
>>> at
>>> org.drools.reteoo.ReteooRuleBase.<init>(ReteooRuleBase.java:124)
>>> at
>>> org.drools.reteoo.ReteooRuleBase.<init>(ReteooRuleBase.java:101)
>>> at
>>> org.drools.RuleBaseFactory.newRuleBase(RuleBaseFactory.java:57)
>>> at
>>> org.drools.RuleBaseFactory.newRuleBase(RuleBaseFactory.java:38)
>>> at
>>> net.firstpartners.drools.RuleRunner.loadRules(RuleRunner.java:39)
>>> at
>>>
>>>
>>> net.firstpartners.drools.RuleRunner.runStatelessRules(RuleRunner.java:167)
>>> at
>>> net.firstpartners.rp2.rp2Servlet.callRules(rp2Servlet.java:96)
>>> at
>>> net.firstpartners.rp2.rp2Servlet.service(rp2Servlet.java:137)
>>> at
>>> javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
>>> at
>>>
>>> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
>>> at
>>>
>>>
>>> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
>>> at
>>>
>>>
>>> com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
>>> at
>>>
>>>
>>> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
>>> at
>>>
>>>
>>> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
>>> at
>>>
>>>
>>> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
>>> at
>>>
>>>
>>> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
>>> at
>>>
>>>
>>> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
>>> at
>>>
>>> org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
>>> at
>>>
>>>
>>> com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:54)
>>> at
>>>
>>>
>>> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
>>> at
>>>
>>>
>>> com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:306)
>>> at
>>>
>>>
>>> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
>>> at org.mortbay.jetty.Server.handle(Server.java:313)
>>> at
>>>
>>> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)
>>> at
>>>
>>>
>>> org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:830)
>>> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
>>> at
>>> org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
>>> at
>>> org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
>>> at
>>>
>>>
>>> org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:396)
>>> at
>>>
>>>
>>> org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)
>>>
>>>
>>>
>>>
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>>>
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>>
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