NIFI-10958 Adjusted Script Engine handling to avoid exceptions

- Added empty check for list of discovered Script Engines to avoid exceptions for documentation generation on Java 17 Signed-off-by: Matthew Burgess <mattyb149@apache.org> This closes #6774
apache · Dec 12, 2022 · c11dff9 · c11dff9
1 parent 2fa8217
commit c11dff9
Showing 1 changed file with 12 additions and 6 deletions.
diff --git a/...i-scripting-processors/src/main/java/org/apache/nifi/script/ScriptingComponentHelper.java b/...i-scripting-processors/src/main/java/org/apache/nifi/script/ScriptingComponentHelper.java
@@ -178,15 +178,21 @@ public void createResources(final boolean requireInvocable) {
             engineAllowableValues = engineList;
             AllowableValue[] engines = engineList.toArray(new AllowableValue[0]);
 
-            SCRIPT_ENGINE = new PropertyDescriptor.Builder()
+            final PropertyDescriptor.Builder enginePropertyBuilder = new PropertyDescriptor.Builder()
                     .name("Script Engine")
                     .required(true)
-                    .description("The engine to execute scripts")
-                    .allowableValues(engines)
-                    .defaultValue(engines[0].getValue())
+                    .description("Language Engine for executing scripts")
                     .required(true)
-                    .expressionLanguageSupported(ExpressionLanguageScope.NONE)
-                    .build();
+                    .expressionLanguageSupported(ExpressionLanguageScope.NONE);
+
+            if (engineList.isEmpty()) {
+                enginePropertyBuilder.description("No Script Engines found");
+            } else {
+                enginePropertyBuilder.allowableValues(engines);
+                enginePropertyBuilder.defaultValue(engines[0].getValue());
+            }
+
+            SCRIPT_ENGINE = enginePropertyBuilder.build();
             descriptors.add(SCRIPT_ENGINE);
         }