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Breaking Changes
If you are upgrading from version 0.9.x, there are some breaking changes you will have to address.
Rule files and subdirectories must be located under src/resources/. You can no longer use some arbitrary file system path. This change and the one discussed below were required to align the plugin with Drools conventions.
grails.plugin.drools.drlFileLocation must be a single directory name and not a path. For example, the default of "rules" refers to the following file system path: src/resources/rules/.
Rule files are now available on the classpath using / instead of .. Older versions of the plugin violated the DRY principle by having the same rule file in two different locations. For example,
droolsService.executeFromFile("rules.ruleOne.drl", [facts])
becomes
droolsService.executeFromFile("rules/ruleOne.drl", [facts])
And
classLoader.getResourceAsStream("rules.ruleOne.drl")
becomes
classLoader.getResourceAsStream("rules/ruleOne.drl")
Rule files must have a "drl" or "rule" suffix. This change avoids unnecessary clutter in the target directory by omitting hidden files and directories.