Cannot find ScriptEngine for JDK8 and Wildfly

Closes #12247

services/src/main/java/org/keycloak/scripting/DefaultScriptingProvider.java

@@ -23,6 +23,7 @@ import javax.script.ScriptEngine;
 import javax.script.ScriptEngineManager;
 import javax.script.ScriptException;
 
+import org.jboss.logging.Logger;
 import org.keycloak.models.ScriptModel;
 import org.keycloak.platform.Platform;
 import org.keycloak.services.ServicesLogger;
@@ -35,6 +36,8 @@ import org.keycloak.utils.ProxyClassLoader;
  */
 public class DefaultScriptingProvider implements ScriptingProvider {
 
+    private static final Logger logger = Logger.getLogger(DefaultScriptingProvider.class);
+
     private final DefaultScriptingProviderFactory factory;
 
     DefaultScriptingProvider(DefaultScriptingProviderFactory factory) {
@@ -136,6 +139,8 @@ public class DefaultScriptingProvider implements ScriptingProvider {
                 scriptClassLoader = DefaultScriptingProvider.class.getClassLoader();
             }
 
+            logger.debugf("Using classloader %s to load script engine", scriptClassLoader);
+
             Thread.currentThread().setContextClassLoader(scriptClassLoader);
             return new ScriptEngineManager().getEngineByMimeType(script.getMimeType());
         }

testsuite/utils/pom.xml

@@ -255,15 +255,26 @@
             <version>${mssql.driver.version}</version>
         </dependency>
 
-        <!-- Nashorn -->
-        <dependency>
-            <groupId>org.openjdk.nashorn</groupId>
-            <artifactId>nashorn-core</artifactId>
-        </dependency>
     </dependencies>
 
 
     <profiles>
+
+        <!-- Nashorn script engine needs to be manually added for the new Java versions as it is not part of the JDK anymore  -->
+        <profile>
+            <id>jdk15</id>
+            <activation>
+                <jdk>[15,)</jdk>
+            </activation>
+
+            <dependencies>
+                <dependency>
+                    <groupId>org.openjdk.nashorn</groupId>
+                    <artifactId>nashorn-core</artifactId>
+                </dependency>
+            </dependencies>
+        </profile>
+
         <profile>
             <id>keycloak-server</id>
             <build>

wildfly/extensions/src/main/java/org/keycloak/provider/wildfly/WildflyPlatform.java

@@ -35,6 +35,9 @@ public class WildflyPlatform implements PlatformProvider {
     // In this module, the attempt to load script engine will be done by default
     private static final String DEFAULT_SCRIPT_ENGINE_MODULE = "org.openjdk.nashorn.nashorn-core";
 
+    // Module name for deployment of keycloak server
+    private static final String DEPLOYMENT_MODULE_NAME = "deployment.keycloak-server.war";
+
     Runnable shutdownHook;
 
     private File tmpDir;
@@ -97,10 +100,18 @@ public class WildflyPlatform implements PlatformProvider {
         } catch (ModuleLoadException mle) {
             if (WildflyUtil.getJavaVersion() >= 15) {
                 log.warnf("Cannot find script engine in the JBoss module '%s'. Please add JavaScript engine to the specified JBoss Module or make sure it is available on the classpath", engineModule);
+                return null;
             } else {
-                log.debugf("Cannot find script engine in the JBoss module '%s'. Will fallback to the default script engine", engineModule);
+                try {
+                    Module module = Module.getContextModuleLoader().loadModule(ModuleIdentifier.fromString(DEPLOYMENT_MODULE_NAME));
+                    log.debugf("Cannot find script engine in the JBoss module '%s'. Will fallback to the default script engine available from the module '%s'", engineModule, DEPLOYMENT_MODULE_NAME);
+                    return module.getClassLoader();
+                } catch (ModuleLoadException mle2) {
+                    // Should not happen
+                    log.warnf("Cannot find script engine in the JBoss module '%s' and in the module '%s'. Please add JavaScript engine to the specified JBoss Module or make sure it is available on the classpath", engineModule, DEPLOYMENT_MODULE_NAME);
+                    return null;
+                }
             }
-            return null;
         }
     }
 }