[jsscripting] Add an alternative MIME type/alias (#13851)

The alternative MIME type text/javascript is also used by Nashorn, therefore we add the same extension as for the main MIME type.
The alias is introduced to simplify the usage in SCRIPT transformation profiles.

* Fix syntax problems in the bndtools file
* Add null check to avoid potential NPE
  In some cases during testing, a NPE occured, this should solve it.

Signed-off-by: Florian Hotze <florianh_dev@icloud.com>

bundles/org.openhab.automation.jsscripting/bnd.bnd

@@ -1,9 +1,10 @@
 Bundle-SymbolicName: ${project.artifactId}
 DynamicImport-Package: *
 Import-Package: org.openhab.core.automation.module.script,javax.management,javax.script,javax.xml.datatype,javax.xml.stream;version="[1.0,2)",org.osgi.framework;version="[1.8,2)",org.slf4j;version="[1.7,2)"
-Require-Capability: osgi.extender;
+Require-Capability: 
+    osgi.extender:=
       filter:="(osgi.extender=osgi.serviceloader.processor)",
-    osgi.serviceloader;
+    osgi.serviceloader:=
       filter:="(osgi.serviceloader=org.graalvm.polyglot.impl.AbstractPolyglotImpl)";
       cardinality:=multiple
 

bundles/org.openhab.automation.jsscripting/src/main/java/org/openhab/automation/jsscripting/internal/GraalJSScriptEngineFactory.java

@@ -40,11 +40,14 @@ import org.osgi.service.component.annotations.Reference;
 public final class GraalJSScriptEngineFactory implements ScriptEngineFactory {
     private static final String CFG_INJECTION_ENABLED = "injectionEnabled";
     private static final String INJECTION_CODE = "Object.assign(this, require('openhab'));";
-    private final JSDependencyTracker jsDependencyTracker;
     private boolean injectionEnabled = true;
 
     public static final String MIME_TYPE = "application/javascript;version=ECMAScript-2021";
+    private static final String ALT_MIME_TYPE = "text/javascript;version=ECMAScript-2021";
+    private static final String ALIAS = "graaljs";
+
     private final JSScriptServiceUtil jsScriptServiceUtil;
+    private final JSDependencyTracker jsDependencyTracker;
 
     @Activate
     public GraalJSScriptEngineFactory(final @Reference JSScriptServiceUtil jsScriptServiceUtil,
@@ -68,7 +71,7 @@ public final class GraalJSScriptEngineFactory implements ScriptEngineFactory {
         // scriptTypes.addAll(graalJSEngineFactory.getMimeTypes());
         // scriptTypes.addAll(graalJSEngineFactory.getExtensions());
 
-        return List.of(MIME_TYPE);
+        return List.of(MIME_TYPE, ALT_MIME_TYPE, ALIAS);
     }
 
     @Override

bundles/org.openhab.automation.jsscripting/src/main/java/org/openhab/automation/jsscripting/internal/OpenhabGraalJSScriptEngine.java

@@ -179,6 +179,9 @@ public class OpenhabGraalJSScriptEngine
         }
 
         ScriptContext ctx = delegate.getContext();
+        if (ctx == null) {
+            throw new IllegalStateException("Failed to retrieve script context");
+        }
 
         // these are added post-construction, so we need to fetch them late
         this.engineIdentifier = (String) ctx.getAttribute(CONTEXT_KEY_ENGINE_IDENTIFIER);