Add a servlet-based implementation of the health checks.

 <?xml version="1.0" encoding="UTF-8" ?>
 <!-- No copyright or license for configuration file, details here are not considered a creative work. -->
 <moqui-conf xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://moqui.org/xsd/moqui-conf-3.xsd">
-    <screen-facade>
-        <screen location="component://webroot/screen/webroot.xml">
-            <subscreens-item name="oci-healthchecks" menu-title="OCI - Healthchecks" menu-include="false"
-                    location="component://moqui-oci-healthchecks/screen/MoquiOciHealthchecksRoot.xml"/>
-        </screen>
-    </screen-facade>
+    <webapp-list>
+        <webapp name="webroot">
+            <servlet name="OciHealthCheckServlet" class="org.moqui.oci.HealthCheckServlet" load-on-startup="1">
+               <url-pattern>/oci/healthchecks/*</url-pattern>
+            </servlet>
+        </webapp>
+    </webapp-list>
 </moqui-conf>

+/*
+ * This software is in the public domain under CC0 1.0 Universal plus a 
+ * Grant of Patent License.
+ * 
+ * To the extent possible under law, the author(s) have dedicated all
+ * copyright and related and neighboring rights to this software to the
+ * public domain worldwide. This software is distributed without any
+ * warranty.
+ * 
+ * You should have received a copy of the CC0 Public Domain Dedication
+ * along with this software (see the LICENSE.md file). If not, see
+ * <http://creativecommons.org/publicdomain/zero/1.0/>.
+ */
+
+apply plugin: 'groovy'
+apply plugin: 'java-library'
+
+sourceCompatibility = '1.11'
+targetCompatibility = '1.11'
+def moquiDir = projectDir.parentFile.parentFile.parentFile
+def frameworkDir = file(moquiDir.absolutePath + '/framework')
+def componentNode = parseComponent(project)
+version = componentNode.'@version'
+
+// maybe in the future: repositories { mavenCentral() }
+repositories {
+    flatDir name: 'localLib', dirs: frameworkDir.absolutePath + '/lib'
+    flatDir name: 'librepo', dirs: projectDir.absolutePath + '/librepo'
+    mavenCentral()
+}
+
+// Log4J has annotation processors, disable to avoid warning
+tasks.withType(JavaCompile) { options.compilerArgs << "-proc:none" }
+tasks.withType(GroovyCompile) { options.compilerArgs << "-proc:none" }
+
+dependencies {
+    implementation project(':framework')
+    //implementation 'org.keycloak:keycloak-servlet-filter-adapter:21.0.1'
+    //implementation 'org.keycloak:keycloak-admin-client:21.0.1'
+    //api 'javax.servlet:javax.servlet-api:4.0.1'
+}
+
+task cleanLib(type: Delete) { delete fileTree(dir: projectDir.absolutePath+'/lib', include: '*') }
+
+// by default the Java plugin runs test on build, change to not do that (only run test if explicit task)
+// no longer workds as of gradle 4.8 or possibly earlier, use clear() instead: check.dependsOn.remove(test)
+check.dependsOn.clear()
+
+jar {
+    destinationDir = file(projectDir.absolutePath + '/lib')
+    baseName = componentNode.'@name'
+}
+
+task copyDependencies { doLast {
+    copy { from (configurations.runtimeClasspath - project(':framework').configurations.runtimeClasspath - project(':framework').jar.archivePath)
+        into file(projectDir.absolutePath + '/lib') }
+} }
+copyDependencies.dependsOn cleanLib
+jar.dependsOn copyDependencies
+

+/*
+ * This software is in the public domain under CC0 1.0 Universal plus a 
+ * Grant of Patent License.
+ * 
+ * To the extent possible under law, the author(s) have dedicated all
+ * copyright and related and neighboring rights to this software to the
+ * public domain worldwide. This software is distributed without any
+ * warranty.
+ * 
+ * You should have received a copy of the CC0 Public Domain Dedication
+ * along with this software (see the LICENSE.md file). If not, see
+ * <http://creativecommons.org/publicdomain/zero/1.0/>.
+ */
+
+package org.moqui.oci
+
+import groovy.transform.CompileStatic
+
+import java.io.IOException
+import javax.servlet.ServletException
+import javax.servlet.http.HttpServlet
+import javax.servlet.http.HttpServletRequest
+import javax.servlet.http.HttpServletResponse
+
+import org.moqui.context.ExecutionContext
+
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
+
+@CompileStatic
+public class HealthCheckServlet extends HttpServlet {
+    protected final static Logger logger = LoggerFactory.getLogger(HealthCheckServlet.class)
+
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        String pathInfo = request.getPathInfo()
+        switch (pathInfo) {
+            case "/start":
+                response.setStatus(HttpServletResponse.SC_OK)
+                break
+            case "/ready":
+                response.setStatus(HttpServletResponse.SC_OK)
+                break
+            case "/live":
+                response.setStatus(HttpServletResponse.SC_OK)
+                break
+
+            default:
+                response.setStatus(HttpServletResponse.SC_NOT_FOUND)
+                break
+        }
+    }
+}