Java Development Experts
Enterprise Java consulting, LTS migrations, Spring Boot modernization, and long-term support for organizations running mission-critical Java systems.
PALADEM’s enterprise Java development experts help engineering organizations build, modernize, and sustain long-lived Java systems. Whether you need Java consulting to plan a move off Java 8 or 11, a Spring Boot 2 to 3 upgrade done without breaking production, JVM tuning on a workload that is missing its latency targets, or a steady partner to maintain a large Java codebase, our Java experts deliver work that holds up under real engineering scrutiny.
Why Choose Java?
Java remains the backbone of enterprise software in 2026 for reasons that have only grown stronger over time. The JVM is one of the most observable and tunable runtimes ever built, with decades of profiler, garbage collector, and tooling maturity behind it. Java 21 LTS is the standard production target, Java 25 LTS has shipped, and virtual threads have made high-concurrency server code genuinely pleasant to write. Modern Java looks much less like the ceremony-heavy language people remember: records, sealed classes, pattern matching, and switch expressions are day-to-day syntax. Spring Boot 3, Jakarta EE, and GraalVM native-image give teams a credible path from classic server workloads to modern cloud-native services. Java is the right choice when you need strong typing, long-term support, deep ecosystem reach, and a platform your organization can still hire for ten years from now.
Our Java Services
Custom Java Application Development
We design and build Java applications end to end, from initial architecture through production deployment. Our work targets current Java LTS releases and uses Spring Boot 3, records, sealed classes, pattern matching, and virtual threads where they earn their place. We integrate with the backing services your organization already runs: relational and document databases, message brokers, identity providers, and whatever cloud platform the workload belongs on. Every application we ship is architected for the ten-year view, not the launch demo.
Java Consulting & Architecture
Our Java consulting experts advise engineering leaders on the decisions that are hardest to reverse: module boundaries, monolith-versus-service topology, persistence strategy, build systems, and testing structure. We review existing codebases, identify architectural risk, and deliver written recommendations your team can execute. When it helps, we embed alongside your engineers to model the patterns in code rather than just describing them in a document.
Performance Optimization
Slow Java applications are almost always diagnosable. We use Java Flight Recorder, async-profiler, GC logs, and real user monitoring data to locate the actual hot paths rather than the suspected ones. From there we prioritize fixes by impact: query and index work, connection pool sizing, thread pool and virtual-thread adoption, garbage collector selection (G1, ZGC, or Shenandoah), heap tuning, and build-level optimizations. The deliverable is a prioritized plan with measured before and after numbers.
Legacy Java Modernization
We offer incremental modernization of legacy Java estates: Java 8 or 11 to 17, 21, or 25 LTS, Spring Boot 2 to 3 with the javax to jakarta namespace change, dependency vulnerability backlogs, Log4Shell-era security debt, and monolith-to-modular-monolith restructuring. Our approach is staged migration: dependency audit, intermediate stops where they reduce risk, selective adoption of records, sealed classes, and pattern matching, and a plan that keeps the application shippable throughout. No big-bang rewrites.
Java Support & Maintenance
We provide ongoing support for production Java applications, including LTS upgrades, dependency and CVE patching, JVM and GC tuning, build pipeline acceleration, bug triage, and feature work. Our maintenance engagements are sized to the real surface area of your codebase and keep your application current with Java’s LTS cadence rather than letting it drift toward another forced migration.
Why PALADEM?
- Built for Enterprise Java. Our Java work targets long-lived, mission-critical systems where correctness, observability, and maintainability matter more than speed to the next framework.
- US-Based Architecture, Global Delivery. Senior US architects lead every engagement, supported by a global engineering team for efficient, cost-effective delivery. See our full services for how we structure engagements.
- Software Stewardship Approach. Every Java engagement is guided by our Software Stewardship Framework™, which treats your application as a long-lived asset to be cared for across all eight stewardship pillars rather than a one-time deliverable.
Related PALADEM Services
Expertise translates into practice through PALADEM’s service lines. These are the most commonly engaged services alongside or instead of expertise-specific work.
Fractional CTO & CIO Leadership
Continuous executive technology leadership for organizations whose technology decisions are starting to have permanent consequences.
Learn moreCustom Web Application Development
Bespoke web applications built and stewarded for the long term by US architecture leadership and a proven global delivery team.
Learn moreSoftware Product Management
Discovery, roadmap, and acceptance discipline that gets the right thing built and shipped on a predictable cadence.
Learn moreAgentic AI Business Automation
Autonomous workflows that reason and act, with the guardrails, checkpoints, and human oversight to keep them safe.
Learn moreUI/UX Design
Interface and experience design grounded in the people who will actually use the system.
Learn moreQA & Testing
Continuous, evidence-based quality validation across automated regression, manual testing, and performance testing.
Learn moreFrequently Asked Questions
Our application is still on Java 8 or 11. What does a migration to Java 21 or 25 LTS actually involve?
The hard work in a Java 8 or 11 to 21 (or 25) LTS migration is almost never the language itself. It is the dependency graph. Removed and encapsulated JDK internals, the javax to jakarta namespace rename for anything touching Jakarta EE or Spring, reflection restrictions, and older frameworks that never shipped a compatible release all surface at the same time. Our approach is a staged migration: dependency and bytecode audit first, an intermediate Java 17 stop where it reduces risk, then 21 or 25 with the application remaining shippable throughout. We adopt records, sealed classes, pattern matching, and virtual threads selectively where they earn their place, not as a rewrite.
How do you approach a Spring Boot 2 to 3 upgrade with the javax to jakarta namespace change?
Spring Boot 3 moved the entire servlet, persistence, and validation surface from javax to jakarta, which means every import, every third-party library, and every piece of generated code has to be on compatible versions at the same time. We start with a dependency compatibility matrix against the target Spring Boot and Java LTS versions, run an automated namespace rewrite, then work through the manual edges: custom filters, security configuration, older JPA providers, legacy SOAP or JMS libraries, and anything that depended on removed Spring APIs. The migration runs branch by branch so the production line stays releasable while the Spring Boot 3 branch stabilizes.
Should we split our Java monolith into microservices, or is a modular monolith a better fit?
Most Java monoliths we see do not have a microservices problem. They have a module-boundary problem. Splitting into many services before those boundaries are clean usually moves the complexity into the network and makes the system harder to operate, not easier. Our default recommendation is a modular monolith: enforce internal boundaries with Gradle or Maven modules, clean up the package structure, and extract a service only when a module has real independent scaling, deployment, or team-ownership pressure. That is incremental modernization rather than a reflex toward microservicing.
When does GraalVM native-image actually pay off for a Java service?
GraalVM native-image is a real option in 2026, not a demo, but it is not free. It pays off when cold-start latency and memory footprint are first-class requirements, such as serverless functions, short-lived CLI tools, or scale-to-zero microservices behind an autoscaler. It costs you build time, a more constrained reflection and dynamic-proxy model, and a narrower set of compatible libraries. For long-running server workloads on a warm JVM, the HotSpot JIT with virtual threads and modern garbage collectors is usually the better answer. We make that call per service based on the actual runtime profile.
How do you approach JVM tuning and garbage collector selection for production?
JVM tuning starts with evidence. We collect Java Flight Recorder profiles, GC logs, and async-profiler samples from the real workload rather than from a synthetic benchmark. From there we choose the garbage collector deliberately: G1 for most general server workloads, ZGC or Shenandoah when consistent sub-millisecond pause times are a hard requirement, Parallel GC for throughput-bound batch jobs. Heap sizing, thread pool sizing, and virtual-thread adoption are treated as engineering decisions with measured before and after numbers, not folklore settings copied from a blog post.