diff --git a/karate-core/src/main/java/com/intuit/karate/core/ScenarioRuntime.java b/karate-core/src/main/java/com/intuit/karate/core/ScenarioRuntime.java
index 7147d61f9..e2da211db 100644
--- a/karate-core/src/main/java/com/intuit/karate/core/ScenarioRuntime.java
+++ b/karate-core/src/main/java/com/intuit/karate/core/ScenarioRuntime.java
@@ -30,6 +30,7 @@
 import com.intuit.karate.ScenarioActions;
 import com.intuit.karate.StringUtils;
 import com.intuit.karate.graal.JsEngine;
+import com.intuit.karate.graal.JsValue;
 import com.intuit.karate.http.ResourceType;
 import com.intuit.karate.shell.StringLogAppender;
 
@@ -95,7 +96,7 @@ public ScenarioRuntime(FeatureRuntime featureRuntime, Scenario scenario) {
             List<FeatureResult> list = new ArrayList(1);
             FeatureResult fr = new FeatureResult(featureRuntime.featureCall.feature);
             fr.setCallDepth(1);
-            fr.addResult(featureRuntime.setupResult);            
+            fr.addResult(featureRuntime.setupResult);
             list.add(fr);
             sr.addCallResults(list);
             featureRuntime.setupResult = null;
@@ -291,13 +292,15 @@ private void evalConfigJs(String js, String displayName) {
             return;
         }
         try {
-            Variable fun = engine.evalJs("(" + js + ")");
-            if (!fun.isJsFunction()) {
-                logger.warn("not a valid js function: {}", displayName);
-                return;
+            synchronized (JsValue.LOCK) {
+                Variable fun = engine.evalJs("(" + js + ")");
+                if (!fun.isJsFunction()) {
+                    logger.warn("not a valid js function: {}", displayName);
+                    return;
+                }
+                Map<String, Object> map = engine.getOrEvalAsMap(fun);
+                engine.setVariables(map);
             }
-            Map<String, Object> map = engine.getOrEvalAsMap(fun);
-            engine.setVariables(map);
         } catch (Exception e) {
             String message = ">> " + scenario.getDebugInfo() + "\n>> " + displayName + " failed\n>> " + e.getMessage();
             error = JsEngine.fromJsEvalException(js, e, message);
diff --git a/karate-core/src/test/java/com/intuit/karate/core/parajava/ParallelJavaTest.java b/karate-core/src/test/java/com/intuit/karate/core/parajava/ParallelJavaTest.java
index 8cdb23d3d..de53aab60 100644
--- a/karate-core/src/test/java/com/intuit/karate/core/parajava/ParallelJavaTest.java
+++ b/karate-core/src/test/java/com/intuit/karate/core/parajava/ParallelJavaTest.java
@@ -10,8 +10,9 @@ public class ParallelJavaTest {
 
     @Test
     public void testParallel() {
-        Results results = Runner.path("classpath:com/intuit/karate/core/parajava/parallel-java.feature")
+        Results results = Runner.path("classpath:com/intuit/karate/core/parajava")
                 .configDir("classpath:com/intuit/karate/core/parajava")
+                .karateEnv("foo")
                 .parallel(5);
         assertEquals(0, results.getFailCount(), results.getErrorMessages());
     }
diff --git a/karate-core/src/test/java/com/intuit/karate/core/parajava/parallel-java.feature b/karate-core/src/test/java/com/intuit/karate/core/parajava/parallel-java.feature
deleted file mode 100644
index b839487c8..000000000
--- a/karate-core/src/test/java/com/intuit/karate/core/parajava/parallel-java.feature
+++ /dev/null
@@ -1,7 +0,0 @@
-Feature:
-
-Scenario: test 1
-* match Hello.sayHello("foo") == "hello foo"
-
-Scenario: test 2
-* match Hello.sayHello("foo") == "hello foo"
diff --git a/karate-core/src/test/java/com/intuit/karate/core/parajava/parallel-java1.feature b/karate-core/src/test/java/com/intuit/karate/core/parajava/parallel-java1.feature
new file mode 100644
index 000000000..935ff2787
--- /dev/null
+++ b/karate-core/src/test/java/com/intuit/karate/core/parajava/parallel-java1.feature
@@ -0,0 +1,21 @@
+Feature:
+
+Scenario: test 1
+* match Hello.sayHello("foo") == "hello foo"
+* match addVals(1, 2) == 3
+
+Scenario: test 2
+* match Hello.sayHello("foo") == "hello foo"
+* match addVals(1, 2) == 3
+
+Scenario: test 3
+* match Hello.sayHello("foo") == "hello foo"
+* match addVals(1, 2) == 3
+
+Scenario: test 4
+* match Hello.sayHello("foo") == "hello foo"
+* match addVals(1, 2) == 3
+
+Scenario: test 5
+* match Hello.sayHello("foo") == "hello foo"
+* match addVals(1, 2) == 3
diff --git a/karate-core/src/test/java/com/intuit/karate/core/parajava/parallel-java2.feature b/karate-core/src/test/java/com/intuit/karate/core/parajava/parallel-java2.feature
new file mode 100644
index 000000000..935ff2787
--- /dev/null
+++ b/karate-core/src/test/java/com/intuit/karate/core/parajava/parallel-java2.feature
@@ -0,0 +1,21 @@
+Feature:
+
+Scenario: test 1
+* match Hello.sayHello("foo") == "hello foo"
+* match addVals(1, 2) == 3
+
+Scenario: test 2
+* match Hello.sayHello("foo") == "hello foo"
+* match addVals(1, 2) == 3
+
+Scenario: test 3
+* match Hello.sayHello("foo") == "hello foo"
+* match addVals(1, 2) == 3
+
+Scenario: test 4
+* match Hello.sayHello("foo") == "hello foo"
+* match addVals(1, 2) == 3
+
+Scenario: test 5
+* match Hello.sayHello("foo") == "hello foo"
+* match addVals(1, 2) == 3
diff --git a/karate-core/src/test/java/com/intuit/karate/core/parajava/setup.feature b/karate-core/src/test/java/com/intuit/karate/core/parajava/setup.feature
index 0b1ec58b9..d00d8e3b7 100644
--- a/karate-core/src/test/java/com/intuit/karate/core/parajava/setup.feature
+++ b/karate-core/src/test/java/com/intuit/karate/core/parajava/setup.feature
@@ -2,4 +2,6 @@
 Feature:
 
 Scenario:
+* def addVals = function(val1, val2){ return val1 + val2 }
 * def Hello = Java.type('com.intuit.karate.core.parallel.Hello')
+* def BigDecimal = Java.type('java.math.BigDecimal')