fixes(#5439): Build should enforce a required jdk version

docs/modules/ROOT/pages/contributing/developers.adoc

@@ -24,6 +24,8 @@ In order to build the project, you need to comply with the following requirement
 
 * **Go version 1.16+**: needed to compile and test the project. Refer to the https://golang.org/[Go website] for the installation.
 * **GNU Make**: used to define composite build actions. This should be already installed or available as a package if you have a good OS (https://www.gnu.org/software/make/).
+* **JDK version 17+**: the build requires JDK version 17 or above. This corresponds to the JDK version of the integration base image.
+* **Maven version 3.8+**: the build requires Maven 3.8 or above. This corresponds to the version defined in the `build/Dockerfile`.
 * **MinGW**: needed to compile the project on Windows. Refer to the https://www.mingw-w64.org/[MinGW website] for the installation.
 * **Windows Subsystem for Linux (WSL)**: for running Linux binary executables natively on Windows. Refer to https://docs.microsoft.com/en-us/windows/wsl/install[WSL Website] for installation. Alternatively, you can use https://www.cygwin.com/[Cygwin] or https://www.educative.io/edpresso/how-to-install-git-bash-in-windows[Git Bash].
 

script/Makefile

@@ -230,7 +230,10 @@ build-platform: build build-kamel-platform
 
 ci-build: clean codegen set-version check-licenses dir-licenses build-kamel cross-compile
 
-do-build: gotestfmt-install
+check_jdk_version:
+	@go run ./script/check_jdk_version.go
+
+do-build: gotestfmt-install check_jdk_version
 ifeq ($(DO_TEST_PREBUILD),true)
 TEST_PREBUILD = build
 else

script/check_jdk_version.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"fmt"
+	"os/exec"
+	"regexp"
+	"strconv"
+)
+
+func main() {
+
+	cmd := exec.Command("java", "-version")
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		panic(fmt.Sprintf("Error: %v\n", err))
+	}
+
+	versionStr := string(output)
+	versionRegex := regexp.MustCompile(`(.*) version "([1-9]+)(\.([0-9]+)){2,3}" (.*)`)
+	matches := versionRegex.FindStringSubmatch(versionStr)
+	if len(matches) < 3 {
+		panic(fmt.Sprintf("Unable to determine Java version: %s\n", versionStr))
+	}
+
+	majorVersion, err := strconv.Atoi(matches[2])
+	if err != nil {
+		panic(fmt.Sprintf("Error parsing Java version: %s - %v\n", versionStr, err))
+	}
+
+	if majorVersion < 17 {
+		panic(fmt.Sprintf("JDK version is below 17: %s\n", versionStr))
+	}
+}