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 =
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