{"id":3782,"date":"2025-12-24T10:00:15","date_gmt":"2025-12-24T15:00:15","guid":{"rendered":"https:\/\/www.mymiller.name\/wordpress\/?p=3782"},"modified":"2025-12-24T10:00:15","modified_gmt":"2025-12-24T15:00:15","slug":"integrating-rulebook-with-a-spring-boot-microservice","status":"publish","type":"post","link":"https:\/\/www.mymiller.name\/wordpress\/spring_ai\/integrating-rulebook-with-a-spring-boot-microservice\/","title":{"rendered":"Integrating RuleBook with a Spring Boot Microservice"},"content":{"rendered":"\n

This post guides you through integrating the RuleBook rule engine with your Spring Boot microservice. We\u2019ll cover adding the dependency, configuring RuleBook, and creating a service to utilize it.<\/p>\n

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

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

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

<dependency>\n    <groupId>org.rulebook<\/groupId>\n    <artifactId>rulebook-core<\/artifactId>\n    <version>5.1.0<\/version>\n<\/dependency>\n<\/code><\/pre>\n
Gradle:<\/strong><\/p>\n
implementation 'org.rulebook:rulebook-core:5.1.0'\n<\/code><\/pre>\n
2. RuleBook Configuration<\/strong><\/p>\n
RuleBook doesn\u2019t require any specific configuration in Spring Boot. Its design promotes defining rules directly within your service classes, leveraging Java 8 lambdas for a concise and readable syntax.<\/p>\n
3. Creating RuleBook Rules<\/strong><\/p>\n
Define your rules using RuleBook\u2019s fluent API and lambdas. Here\u2019s an example of a discount rule:<\/p>\n
import org.rulebook.core.rule.Rule;\n\npublic class DiscountRule {\n\n    public static Rule<Order> applyDiscountRule() {\n        return Rule.named("Apply 10% discount for orders over $100")\n                .when(order -> order.getTotalPrice() > 100)\n                .then(order -> order.applyDiscount(0.1));\n    }\n}\n<\/code><\/pre>\n
This code defines a rule named \u201cApply 10% discount for orders over $100\u201d. It checks if the order\u2019s total price is greater than 100 and applies a 10% discount if the condition is met.<\/p>\n
4. Using RuleBook in a Service<\/strong><\/p>\n
Inject the RuleBook<\/code> bean into your service class and use it to execute rules against your domain objects.<\/p>\n
import org.rulebook.core.rule.Rule;\nimport org.rulebook.core.rulebook.Rulebook;\nimport org.springframework.stereotype.Service;\n\nimport java.util.List;\n\n@Service\npublic class OrderService {\n\n    public Order applyRules(Order order) {\n        Rule<Order> discountRule = DiscountRule.applyDiscountRule(); \n\n        \/\/ Create a Rulebook and add the rule\n        Rulebook<Order> rulebook = Rulebook.of(List.of(discountRule)); \n\n        \/\/ Execute the Rulebook on the order\n        rulebook.run(order); \n        return order;\n    }\n}\n<\/code><\/pre>\n
This service:<\/p>\n
    \n
  • Retrieves the discountRule<\/code> defined earlier.<\/li>\n
  • Creates a Rulebook<\/code> and adds the discountRule<\/code> to it.<\/li>\n
  • Executes the Rulebook<\/code> on the given order<\/code> object.<\/li>\n
  • Returns the potentially modified order<\/code> object.<\/li>\n<\/ul>\n
    5. YML Configuration (Not Required)<\/strong><\/p>\n
    RuleBook doesn\u2019t typically require any specific configuration in your application.yml<\/code> or application.properties<\/code> file.<\/p>\n
    This guide demonstrates how to integrate RuleBook with your Spring Boot microservice. RuleBook\u2019s intuitive API and seamless integration with Java 8 lambdas make it a great choice for implementing business rules. You can expand on this by creating more complex rules and rule chains to manage your business logic effectively. Remember to adapt the rules and domain models to your specific requirements.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":3792,"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-3782","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\/board-3772063_1280-jpg.avif","jetpack-related-posts":[{"id":3780,"url":"https:\/\/www.mymiller.name\/wordpress\/spring_ai\/integrating-jess-with-a-spring-boot-microservice\/","url_meta":{"origin":3782,"position":0},"title":"Integrating Jess with a Spring Boot Microservice","author":"Jeffery Miller","date":"December 24, 2025","format":false,"excerpt":"This post explores how to integrate the Jess rule engine with your Spring Boot microservice. 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