Why Choose Java 11: New Features, Migration Tips, and Common Upgrade Issues

Java 11 offers several improvements over earlier versions, such as better container support, a slimmer distribution, and long‑term support, delivering up to a 16% performance boost in certain workloads.

Key language enhancements include the var keyword for type inference, new collection factory methods ( of() , copyOf() ), expanded Stream operations ( takeWhile , iterate , ofNullable , dropWhile ), and various API upgrades for strings and collections.

The new built‑in HTTP Client API enables both synchronous and asynchronous HTTP requests, simplifying network communication.

Running Java applications in Docker containers is now fully supported; the JVM can respect cgroup memory and CPU limits, avoiding performance degradation that existed in earlier releases.

When migrating from Java 8 to Java 11, developers often encounter three common problems:

Missing JAXB (javax.xml.bind) module . Java 11 removed Java EE modules, causing runtime warnings. The fix is to add the required dependencies manually: <dependency> <groupId>javax.xml.bind</groupId> <artifactId>jaxb-api</artifactId> <version>2.3.0</version> </dependency> <dependency> <groupId>com.sun.xml.bind</groupId> <artifactId>jaxb-core</artifactId> <version>2.3.0</version> </dependency> <dependency> <groupId>com.sun.xml.bind</groupId> <artifactId>jaxb-impl</artifactId> <version>2.3.0</version> </dependency>

Compilation errors due to removed sun.misc classes . Replace the old Base64 encoder/decoder with the standard java.util.Base64 API, e.g.: java.util.Base64.Encoder encoder = java.util.Base64.getEncoder(); java.util.Base64.Decoder decoder = java.util.Base64.getDecoder();

Service startup failures (e.g., Eureka with embedded Tomcat) . Adding the appropriate JAXB runtime dependency resolves the issue: <dependency> <groupId>org.glassfish.jaxb</groupId> <artifactId>jaxb-runtime</artifactId> <version>2.3.2</version> </dependency> For Java 9+ modular projects, also include the activation library: <dependency> <groupId>javax.activation</groupId> <artifactId>activation</artifactId> <version>1.1.1</version> </dependency>

Overall, Java 11’s regular six‑month release cadence makes it a stable LTS choice, and while Java 8 remains widely used, newer features and optimizations are no longer back‑ported to it.