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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallJava 11 adds a standard HTTP Client, experimental ZGC and Epsilon collectors, and several runtime and library changes. It does not guarantee that an application will run faster. For teams moving from Java 8, the most consequential work is often compatibility: Java 11 defaults to G1, removes older deployment technologies and Java EE/CORBA modules, no longer bundles JavaFX, and enables TLS 1.3 by default.
What changed in Java 11?
Java 11 combines a standardized networking API with HotSpot runtime changes and removals that can affect builds, deployments, and operations. It helps to separate Java SE APIs from implementation details: an API may be available to application code, while a garbage collector or compiler-thread behavior belongs to the particular JDK implementation and build.
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Standard Java SE API changes
- The HTTP Client graduated from incubation and is part of the standard
java.net.httppackage. Collection.toArray(IntFunction)lets callers request an array with a desired runtime type.- Java 11 supports Unicode 10.0.0. Oracle’s JDK 11 release notes give the figures as 16,018 new characters, 18 new blocks, and 10 new scripts.
The details above do not constitute a complete account of Java language syntax changes. Check the Java SE 11 specification before relying on a particular language feature.
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HotSpot and platform changes
- ZGC and Epsilon were introduced as experimental garbage collectors.
- JDK 11 dynamically manages compiler threads: in the implementation described by Oracle’s release notes, it starts one compiler thread of each type at startup and can start or stop additional threads dynamically.
-XX:+UseDynamicNumberOfCompilerThreadsis enabled by default there. - TLS 1.3 is implemented and enabled by default in JDK 11.
What does the standard HTTP Client change?
The HTTP Client was first introduced as an incubating API in JDK 9 and updated in JDK 10. In JDK 11 it became a standard API in java.net.http. This gives Java applications a built-in HTTP client without relying on the former incubator package.
Code that imports jdk.incubator.http must be updated to use the standard package and checked against the standardized API. Do not assume the change alone improves request speed: the release notes establish the API transition, not a workload-specific performance advantage.
Which garbage collector should you use?
Java 11’s collector options serve different goals; they are not interchangeable performance upgrades. In particular, G1 was already the default collector beginning with JDK 9. A move from Java 8 may therefore change the default to G1, but that default change was not introduced in Java 11.
| Collector | Java 11 context | Practical interpretation |
|---|---|---|
| G1 | Default from JDK 9 onward. Oracle’s migration guide characterizes it as low-pause oriented and says it should provide a better overall experience for most users. | A Java 8 migration may use G1 where it previously used Parallel GC by default. Oracle’s characterization is not a guarantee for every application. |
| ZGC | Experimental in JDK 11. The release notes describe design goals of pauses no longer than 10 ms, pauses that do not increase with heap or live-set size, and support for heaps from a few hundred megabytes through multiple terabytes. | These are design goals, not measured results or service-level guarantees. Check support and limitations for the exact vendor, build, platform, and update before considering it. |
| Epsilon | Experimental no-op collector. It allocates memory but does not reclaim it. | Useful for narrow cases such as measuring collector costs, testing memory pressure or footprint, and some very short-lived jobs. It is not a general-purpose collector for applications that need memory reclaimed. |
Oracle’s JDK 11 migration guide contrasts JDK 8’s Parallel GC default with G1 in JDK 9 and later. Treat its expectation of a better overall experience for most users as general guidance, not as a prediction for a particular service.
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How to compare collectors for an application
Run a representative workload on the exact JDK build and platform you intend to deploy. Compare the same application behavior and record:
- Pause-time distribution, including tail latency.
- Throughput under representative load.
- Heap size and live-set size.
- CPU use and memory overhead.
- Vendor, operating-system, platform, and operational constraints.
The JDK 11 release materials describe collector goals and changes; they do not provide an independent head-to-head benchmark establishing that one collector is faster for your workload.
What should Java 8 teams check before migrating?
Oracle’s Oracle JDK Migration Guide, Release 11 recommends running the existing program before recompiling, updating third-party libraries, compiling if needed, and using jdeps during preparation. A staged migration helps distinguish runtime and deployment failures from compilation failures.
- Run the existing application on the target Java 11 build before recompiling. Record startup, runtime, and integration failures so that source and dependency changes do not obscure runtime compatibility problems.
- Inventory dependencies and deployment assumptions. Look for removed JDK modules, applet or Web Start deployment, JavaFX, old GC flags, and dependencies tied to older JDK behavior.
- Update third-party libraries, then compile if needed. Address compilation and class-loading failures, including dependencies that were once supplied by the JDK.
- Use
jdepsto help identify migration concerns. Review its findings alongside the application’s actual dependency and deployment inventory. - Test the exact vendor and update release intended for production. Do not treat testing against one Java 11 build as proof that every Java 11 update has identical behavior.
Removed deployment technologies
Java Web Start, the Java Plug-in, applet deployment, and javaws were removed in JDK 11. Applications still relying on those mechanisms need a replacement deployment approach; changing the JDK alone will not restore them.
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Java EE and CORBA modules removed from the JDK
JDK 11 removed Java EE and CORBA modules that some Java 8 applications may have relied on being present. The affected components include JAXB (java.xml.bind), JAX-WS/SAAJ (java.xml.ws), web-services annotations, CORBA, and the related transaction subset. Missing modules can lead to compilation errors or class-loading failures. Oracle’s migration guide says JAXB and JAX-WS can be downloaded from Maven; plan to supply needed APIs and implementations as application dependencies rather than expecting them in the JDK.
JavaFX is separate
JavaFX is no longer bundled with the JDK. If an application uses it, account for it as a separate download and deployment dependency.
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TLS, certificates, and trust
TLS 1.3 is enabled by default in JDK 11. Exercise real outbound and inbound connections, and review truststores, disabled algorithms, and certificate chains for the systems the application must reach.
Update level matters as well as the major version. Oracle’s JDK 11.0.31 update notes, released April 21, 2026, specify rejection of TLS server certificates anchored by listed Chunghwa roots when those certificates were issued after March 17, 2026. This is a dated trust-store change in that update, not a feature of the original Java 11 release; verify the target update’s notes and test the affected certificate chains if relevant to your environment.
Garbage-collection flags and logs
JDK 11 uses unified JVM logging for garbage-collection logs. Review log arguments and any parser or alerting system that consumes them. Oracle’s migration guide gives -Xlog:gc as the unified logging form and marks -XX:+PrintGCDetails and -XX:+PrintGC deprecated. Check old CMS-related flag combinations and removed options against the target JDK rather than carrying Java 8 arguments forward unchanged.
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Does Java 11 make applications faster?
There is no single speed result implied by the release. A collector’s design target, a default change, or dynamic compiler-thread management is not a comparative benchmark. Applications can respond differently according to workload, latency objectives, heap and live-set size, CPU and memory limits, and platform.
For a meaningful before-and-after comparison, hold the workload and environment steady and report the Java vendor and update, collector and settings, heap conditions, throughput, pause-time distribution, and resource use. If migrating from Java 8, separate the effect of the changed default collector from other code, library, and runtime changes where possible.
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