{"id":3780,"date":"2025-12-24T10:00:13","date_gmt":"2025-12-24T15:00:13","guid":{"rendered":"https:\/\/www.mymiller.name\/wordpress\/?p=3780"},"modified":"2025-12-24T10:00:13","modified_gmt":"2025-12-24T15:00:13","slug":"integrating-jess-with-a-spring-boot-microservice","status":"publish","type":"post","link":"https:\/\/www.mymiller.name\/wordpress\/spring_ai\/integrating-jess-with-a-spring-boot-microservice\/","title":{"rendered":"Integrating Jess with a Spring Boot Microservice"},"content":{"rendered":"\n

This post explores how to integrate the Jess rule engine with your Spring Boot microservice. We\u2019ll cover adding the necessary dependency, configuring Jess, and creating a service to utilize it.<\/p>\n

1. Project Setup and Dependency<\/strong><\/p>\n

Begin by creating a Spring Boot project. Then, add the Jess dependency to your pom.xml<\/code> (Maven) or build.gradle<\/code> (Gradle) file:<\/p>\n

Maven:<\/strong><\/p>\n

<dependency>\n    <groupId>org.jess<\/groupId>\n    <artifactId>jess<\/artifactId>\n    <version>7.1p2<\/version> \n<\/dependency>\n<\/code><\/pre>\n
Gradle:<\/strong><\/p>\n
implementation 'org.jess:jess:7.1p2'\n<\/code><\/pre>\n
2. Jess Configuration<\/strong><\/p>\n
While Spring Boot doesn\u2019t have auto-configuration for Jess, we can easily create a configuration class to initialize and manage the Jess engine.<\/p>\n
import jess.Rete;\nimport org.springframework.context.annotation.Bean;\nimport org.springframework.context.annotation.Configuration;\n\n@Configuration\npublic class JessConfig {\n\n    @Bean\n    public Rete rete() {\n        return new Rete();\n    }\n}\n<\/code><\/pre>\n
This configuration:<\/p>\n
    \n
  • Creates a Rete<\/code> object, which is the core of the Jess engine. This object will be used to load and execute rules.<\/li>\n<\/ul>\n
    3. Creating and Loading Jess Rule Files<\/strong><\/p>\n
    Create a rules<\/code> directory in your src\/main\/resources<\/code> folder. Add your Jess rule files (.clp<\/code> files) here. For example, discount.clp<\/code>:<\/p>\n
    (defrule apply-discount\n    (order (totalPrice ?tp) (discount ?d))\n    (test (> ?tp 100))\n=>\n    (modify ?order (discount (* ?d 1.1)))\n)\n<\/code><\/pre>\n
    In your service, load these rules into the Jess engine.<\/p>\n
    4. Using the Jess Engine in a Service<\/strong><\/p>\n
    Inject the Rete<\/code> bean into your service class and use it to execute rules against your domain objects.<\/p>\n
    import jess.Rete;\nimport jess.JessException;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.stereotype.Service;\n\n@Service\npublic class OrderService {\n\n    @Autowired\n    private Rete rete;\n\n    public Order applyRules(Order order) throws JessException {\n        rete.reset(); \/\/ Reset the engine\n        rete.eval("(load-facts \\"classpath:rules\/discount.clp\\")"); \/\/ Load rules\n        rete.add(order); \/\/ Assert the order object\n        rete.run(); \/\/ Execute the rules\n        return order; \n    }\n}\n<\/code><\/pre>\n
    This service:<\/p>\n
      \n
    • Injects the Rete<\/code> object.<\/li>\n
    • Loads the discount.clp<\/code> rule file.<\/li>\n
    • Asserts the order<\/code> object into the Jess working memory.<\/li>\n
    • Executes the rules using rete.run()<\/code>.<\/li>\n
    • Returns the modified order<\/code> object.<\/li>\n<\/ul>\n
      5. YML Configuration (Optional)<\/strong><\/p>\n
      Jess doesn\u2019t typically require configuration in your application.yml<\/code> or application.properties<\/code> file. However, you might consider externalizing file paths or other Jess-specific settings if needed.<\/p>\n
      This guide provides a starting point for integrating Jess with your Spring Boot microservice. You can build upon this foundation by exploring more advanced Jess features like functions, templates, and defqueries to create complex rule-based systems. Remember to tailor the rules and domain models to your specific business needs.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":3790,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[443],"tags":[],"series":[],"class_list":["post-3780","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-spring_ai"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/www.mymiller.name\/wordpress\/wp-content\/uploads\/2024\/10\/rule-1752536_1280-png.avif","jetpack-related-posts":[{"id":3782,"url":"https:\/\/www.mymiller.name\/wordpress\/spring_ai\/integrating-rulebook-with-a-spring-boot-microservice\/","url_meta":{"origin":3780,"position":0},"title":"Integrating RuleBook with a Spring Boot Microservice","author":"Jeffery Miller","date":"December 24, 2025","format":false,"excerpt":"This post guides you through integrating the RuleBook rule engine with your Spring Boot microservice. 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