While improving the compatibility of the tomcat package with third-party Java runtimes such as Temurin, I encountered a consistent issue where dnf installs java-21-openjdk-headless even when a valid JRE is already present (e.g. temurin-21-jre).

The cause is the dependency chain from tomcat -> ecj. This results in a runtime dependency on OpenJDK, even though the underlying Java library (used by Tomcat) does not need it.

To resolve this and support a runtime-agnostic model, I propose splitting the package into:
    ecj : CLI tool, retains dependency on OpenJDK
    ecj-lib : library JAR, no Java dependency, usable with any JRE/JDK

This would allow applications like Tomcat to depend only on ecj-lib, ensuring compatibility with third-party Java runtimes out of the box.

Reproducible: Always

Steps to Reproduce:
1.Enable temurin repo and install temurin-21-jre
2.Install tomcat
3.Observe that java-21-openjdk-headless is still installed via the ecj dependency
Actual Results:
OpenJDK is installed even though the declared Requires: of tomcat is compatible with Temurin.

Expected Results:
If ecj-lib existed without an explicit Java dependency, Tomcat could be used with any compatible JRE.

Additional Information:
Related discussion: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/ABYNCTW4OEXBTYJ2QCBQLAIRBD3GC335/