graal asValue / asHostObject trick works well #1558

Author: ptrthomas

karate-core/src/main/java/com/intuit/karate/core/ScenarioEngine.java

@@ -1091,7 +1091,12 @@ private Object recurseAndAttach(Object o, Set<Object> seen) {
                     return attach(value);
                 }
             } catch (Exception e) {
-                logger.warn("failed to re-attach graal value: {}", e.getMessage());
+                logger.trace("failed to re-attach graal value (will re-try): {}", e.getMessage());
+                try {
+                    return Value.asValue(value.asHostObject());
+                } catch (Exception inner) {
+                    logger.warn("failed to re-attach graal value: {}", inner.getMessage());
+                }
             }
             return null;
         } else if (o instanceof JsFunction) {
@@ -1142,7 +1147,12 @@ private Object recurseAndAttachAndDeepClone(Object o, Set<Object> seen) {
                 }
                 o = JsValue.toJava(value);
             } catch (Exception e) {
-                logger.warn("failed to re-attach graal value: {}", e.getMessage());
+                logger.trace("failed to re-attach graal value (will re-try): {}", e.getMessage());
+                try {
+                    return Value.asValue(value.asHostObject());
+                } catch (Exception inner) {
+                    logger.warn("failed to re-attach graal value: {}", inner.getMessage());
+                }
                 return null; // we try to move on after stripping this (js function) from the tree
             }
         }

karate-core/src/test/java/com/intuit/karate/core/parallel/karate-config.js

@@ -6,7 +6,7 @@ function fn() {
   var result = karate.callSingle('call-single-from-config.feature', config);
   config.message = result.response.message;
   // this will throw the [Multi threaded access requested by thread xxx but is not allowed for language(s) js.] error
-  // config.Hello = result.Hello;
+  config.Hello = result.Hello;
   var result2 = karate.callSingle('call-single-from-config2.feature', result);
   config.message2 = result2.message;  
   return config;

karate-core/src/test/java/com/intuit/karate/core/parallel/parallel.feature

@@ -15,6 +15,8 @@ Scenario: one
 * match response == { one: '#string' }
 * def result = karate.callSingle('call-single-from-feature.feature')
 * match result.response == { message: 'from feature' }
+# use java instance from callSingle in config
+* match Hello.sayHello('world') == 'hello world'
 
 Scenario: two
 * path 'two'