If your app or error message literally says "requires Java Runtime 1.8.0_241":
# Download Java 8 u241 from Oracle archives
# https://www.oracle.com/java/technologies/javase/8u241-relnotes.html
If you intend to make Java Runtime 18 u241 work in a secure environment, substitute u241 with the actual 18.0.2.1:
Many StackOverflow answers and ancient shell scripts combine Java 8’s u with new version numbers. java runtime 18 u241 work
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). If your app or error message literally says
If you see an error like:
Error: Java runtime 18 u241 not found.
Unsupported major.minor version 62.0
(Note: Java 18 class file version is 62.0; Java 8 is 52.0.) If you find 1
Solution: This JPEG library was removed. Replace with:
ImageIO.read(imageFile);
| You might see | Actual Java version | Status |
|---------------|---------------------|--------|
| Java 18 u241 | ❌ Does not exist | Confusion with Java 8 |
| Java 18.0.2.1 | ✅ Correct | Final public update for Java 18 |
| Java 8 u241 | ✅ Exists | LTS, widely used |
| Java 17 u241 (i.e., 17.0.2+) | ✅ Exists | LTS |
Bottom line: If you need to run an app that says "requires Java 18 runtime 18.u241", check if they actually meant Java 8 u241 (very common) or Java 17.0.2+. Java 18 reached end of life in October 2022.