--- title: Migrating an application to Quarkus: A Graph-Driven... description: A detailed walkthrough demonstrates migrating a Java EE 7 CoolStore monolith from WebLogic to Quarkus using rgctl, a call-graph analysis tool. It covers... canonical: https://daily.dev/posts/migrating-an-application-to-quarkus-a-graph-driven-approach-with-rgctl-m9ydyypwb twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Migrating an application to Quarkus: A Graph-Driven Approach with rgctl | daily.dev og:description: A detailed walkthrough demonstrates migrating a Java EE 7 CoolStore monolith from WebLogic to Quarkus using rgctl, a call-graph analysis tool. It covers... og:url: https://daily.dev/posts/migrating-an-application-to-quarkus-a-graph-driven-approach-with-rgctl-m9ydyypwb og:image: https://api.daily.dev/og/posts/M9YdyYpwB.png og:image:alt: Migrating an application to Quarkus: A Graph-Driven Approach with rgctl og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Migrating an application to Quarkus: A Graph-Driven Approach with rgctl **[Shaaf](https://daily.dev/sources/shaaf)** · 17 min read · 0 upvotes · 0 comments ## Summary A detailed walkthrough demonstrates migrating a Java EE 7 CoolStore monolith from WebLogic to Quarkus using rgctl, a call-graph analysis tool. It covers indexing the codebase, computing blast radius scores to identify risky classes, and generating a priority-ranked migration plan based on PageRank, harmonic centrality, and blast radius. The post then executes the migration step by step: converting javax to jakarta namespaces, replacing EJBs (@Stateless, @Stateful, @MessageDriven) with CDI equivalents, swapping JMS for SmallRye Reactive Messaging, and removing WebLogic-specific descriptors. It concludes with CI policy checks that fail builds when blast radius thresholds are exceeded. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How do I migrate EJB @Stateful session beans to Quarkus since Quarkus has no EJB container? Replace @Stateful EJBs with an @ApplicationScoped CDI bean backed by a ConcurrentHashMap keyed by session or cart ID, since Quarkus has no EJB container and @Stateful does not exist there. For production use, back the map with Redis or a database instead of in-memory storage, but the in-memory map preserves behavior for a straightforward migration. _Teams planning a Quarkus migration can track stateful-bean replacement patterns like this on daily.dev._ ### How do I replace JMS message-driven beans (@MessageDriven) when moving from WebLogic to Quarkus? Replace @MessageDriven beans and the MessageListener interface with SmallRye Reactive Messaging using @Incoming annotated methods that accept the payload type directly (such as String) instead of unwrapping a JMS Message. The ActivationConfigProperty array and manual message parsing are removed entirely, with configuration handled through application.properties connectors like smallrye-kafka or smallrye-in-memory. _Developers modernizing JMS-based EJBs toward reactive messaging can follow discussions like this on daily.dev._ ### How can I determine which classes are safest to migrate first in a large Java EE monolith? Use blast radius analysis, which computes an impact score from 0 to 100 based on strongly connected component decomposition of the call graph, showing direct callers and the full transitive impact zone for a given function. Classes invoked only through JNDI or JMS runtime dispatch, like a ShippingService reached via InitialContext.lookup, can score 0.0 since static analysis can't resolve those calls, making them ideal low-risk starting points. _Engineers ordering monolith migrations by risk can follow blast-radius driven approaches like this on daily.dev._ ## Similar posts on daily.dev - [Automating application migration with MigIQ](https://daily.dev/posts/automating-application-migration-with-migiq-bmmgwjxu1) · Red Hat Developer · 1 upvotes · 0 comments - [Java News Roundup: GraalVM, Jakarta Data, JNoSQL, Azul Payara, WildFly, Quarkus, Atmosphere](https://daily.dev/posts/java-news-roundup-graalvm-jakarta-data-jnosql-azul-payara-wildfly-quarkus-atmosphere-pwl21ckxq) · InfoQ · 10 upvotes · 0 comments --- Tags: [#java](https://daily.dev/tags/java), [#quarkus](https://daily.dev/tags/quarkus), [#jakarta-ee](https://daily.dev/tags/jakarta-ee) [View this post on daily.dev](https://daily.dev/posts/migrating-an-application-to-quarkus-a-graph-driven-approach-with-rgctl-m9ydyypwb) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Migrating an application to Quarkus: A Graph-Driven Approach with rgctl","url":"https://daily.dev/posts/migrating-an-application-to-quarkus-a-graph-driven-approach-with-rgctl-m9ydyypwb","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/migrating-an-application-to-quarkus-a-graph-driven-approach-with-rgctl-m9ydyypwb"},"datePublished":"2026-08-31T19:26:40.262Z","dateModified":"2026-08-31T20:03:02.205Z","description":"A detailed walkthrough demonstrates migrating a Java EE 7 CoolStore monolith from WebLogic to Quarkus using rgctl, a call-graph analysis tool. 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