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The following code snippet contains logic to print the Java Bytecode Version for all class files.

task analyzeBytecode {
    doLast {
        // Iterate over all subprojects
        subprojects.each { subproject ->
            def runtimeClasspath = subproject.configurations.findByName('runtimeClasspath')
            if (runtimeClasspath) {
                runtimeClasspath.each { file ->
                    println "Analyzing: ${file.name} in ${subproject.name}"
                    try {
                        def jarFile = new java.util.jar.JarFile(file)
                        jarFile.entries().asIterator().each { entry ->
                            if (entry.name.endsWith(".class")) {
                                def inputStream = jarFile.getInputStream(entry)
                                def magicAndVersion = new byte[8]
                                inputStream.read(magicAndVersion)
                                def majorVersion = magicAndVersion[7] & 0xFF
                                println "Class: ${entry.name}, Bytecode version: ${majorVersion}"
                            }
                        }
                    } catch (Exception e) {
                        println "Failed to analyze ${file.name}: ${e.message}"
                    }
                }
            } else {
                println "No runtimeClasspath found for ${subproject.name}"
            }
        }
    }
}