Folks,
A little bit later than expected (!) I've managed to get Drools running within Google App Engine.
A list of the changes that I made to the Drools Core and Drools Util code are below. A lot of these changes are NullPointer checks when reading properties from a file (i.e. things that you might want in the codebase anyway).
Notes on the sample I used to try this out are at
http://code.google.com/p/red-piranha/wiki/ModifyDroolsRunInGoogleAppEngine
The sample (for the moment) is running a pre-built KnowledgeBase within GAE (i.e. no rule compilation, nor any of the advanced features).
What is the best way of submitting the actual code changes for review and possible inclusion as part of the Drools source code?
Thanks
Paul
Drools Core
AbstractRuleBase.java // line 265 surrounded by try / catch
this.config = (RuleBaseConfiguration) droolsStream.readObject();
RuleBaseConfiguration.java // - line 985 surround by try / catch
this.classLoader = ClassLoaderUtil.getClassLoader
RuleBaseConfiguration.java // line 395 surround by try / catch
this.chainedProperties = new ChainedProperties( "rulebase.conf",
RuleBaseConfiguration.java // line 457 surround by try / catch, default Conflict Resolver
setConflictResolver( determineConflictResolver( this.chainedProperties.getProperty( "drools.conflictResolver",
Drools Util
ChainedProperties.java // line 98 - exception check around ClassLoader.getSystemClassLoader();
ChainedProperties.java // line 125 - exception check around ClassLoader.getSystemClassLoader();
ChainedProperties.java // line 160
- null check for properties /key and return default
ChainedProperties.java // line 240 - surround by try / catch for securityaccessexception
if ( file != null && file.exists() ) {
ChainedProperties.java // line 270 - surround by try / catch for securityaccessexception
if ( file != null && file.exists() ) {
ClassFieldInspector.java // line 166 -
return "/" + clazz.getCanonicalName() + ".class";
ClassLoaderUtil.java // line 25 - surround by try / catch for securityaccessexception
ClassLoader systemClassLoader =