Java Runtime 18 U241 Work Review

If your project was built for 8u241, add these flags to your runtime command:

java --add-opens java.base/java.lang=ALL-UNNAMED \
     --add-opens java.base/java.util=ALL-UNNAMED \
     -cp your-app.jar com.example.Main

For Maven/Gradle, set the maven-compiler-plugin to: java runtime 18 u241 work

<properties>
    <maven.compiler.source>18</maven.compiler.source>
    <maven.compiler.target>18</maven.compiler.target>
</properties>

And for missing JAXB:

<dependency>
    <groupId>jakarta.xml.bind</groupId>
    <artifactId>jakarta.xml.bind-api</artifactId>
    <version>4.0.0</version>
</dependency>

Moving forward two years to March 2022, Java 18 represents the opposite end of the spectrum. It is a non-LTS release (supported for only six months), designed to preview future technologies that will eventually land in the next LTS version (Java 21). If your project was built for 8u241 ,

Let’s troubleshoot the most frequent mistakes. If you find 1.8.0_241

Check the application’s manifest or start script:

grep -i "java" start.sh
grep -i "u241" *

If you find 1.8.0_241, install Java 8u241 or equivalent (e.g., OpenJDK 8u242, which includes the same fixes).