diff --git a/legend-engine-core/legend-engine-core-base/legend-engine-core-executionPlan-execution/legend-engine-executionPlan-dependencies/pom.xml b/legend-engine-core/legend-engine-core-base/legend-engine-core-executionPlan-execution/legend-engine-executionPlan-dependencies/pom.xml
index 747ee1ab75d..4ab6519c521 100644
--- a/legend-engine-core/legend-engine-core-base/legend-engine-core-executionPlan-execution/legend-engine-executionPlan-dependencies/pom.xml
+++ b/legend-engine-core/legend-engine-core-base/legend-engine-core-executionPlan-execution/legend-engine-executionPlan-dependencies/pom.xml
@@ -52,6 +52,17 @@
         </dependency>
         <!-- ECLIPSE COLLECTIONS -->
 
+        <!-- JACKSON -->
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-annotations</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+        </dependency>
+        <!-- JACKSON -->
+
         <!-- COMMONS CODEC -->
         <dependency>
             <groupId>commons-codec</groupId>
diff --git a/legend-engine-core/legend-engine-core-base/legend-engine-core-executionPlan-execution/legend-engine-executionPlan-execution/src/main/java/org/finos/legend/engine/plan/execution/result/ConstantResult.java b/legend-engine-core/legend-engine-core-base/legend-engine-core-executionPlan-execution/legend-engine-executionPlan-execution/src/main/java/org/finos/legend/engine/plan/execution/result/ConstantResult.java
index 7c76c29ec75..4cff5899d37 100644
--- a/legend-engine-core/legend-engine-core-base/legend-engine-core-executionPlan-execution/legend-engine-executionPlan-execution/src/main/java/org/finos/legend/engine/plan/execution/result/ConstantResult.java
+++ b/legend-engine-core/legend-engine-core-base/legend-engine-core-executionPlan-execution/legend-engine-executionPlan-execution/src/main/java/org/finos/legend/engine/plan/execution/result/ConstantResult.java
@@ -35,7 +35,7 @@ public <T> T accept(ResultVisitor<T> resultVisitor)
         return resultVisitor.visit(this);
     }
 
-    public Object stream() throws IOException
+    public String stream() throws IOException
     {
         return ConstantResultHelper.stream(this.getValue());
     }
diff --git a/legend-engine-pure/legend-engine-pure-runtime/legend-engine-pure-runtime-planExecution/legend-engine-pure-runtime-java-extension-shared-functions-planExecution/src/main/java/org/finos/legend/engine/pure/runtime/execution/shared/LegendExecute.java b/legend-engine-pure/legend-engine-pure-runtime/legend-engine-pure-runtime-planExecution/legend-engine-pure-runtime-java-extension-shared-functions-planExecution/src/main/java/org/finos/legend/engine/pure/runtime/execution/shared/LegendExecute.java
index f2d37980677..3f8cd06964f 100644
--- a/legend-engine-pure/legend-engine-pure-runtime/legend-engine-pure-runtime-planExecution/legend-engine-pure-runtime-java-extension-shared-functions-planExecution/src/main/java/org/finos/legend/engine/pure/runtime/execution/shared/LegendExecute.java
+++ b/legend-engine-pure/legend-engine-pure-runtime/legend-engine-pure-runtime-planExecution/legend-engine-pure-runtime-java-extension-shared-functions-planExecution/src/main/java/org/finos/legend/engine/pure/runtime/execution/shared/LegendExecute.java
@@ -21,7 +21,6 @@
 import org.finos.legend.engine.plan.execution.result.StreamingResult;
 import org.finos.legend.engine.plan.execution.result.serialization.SerializationFormat;
 import org.finos.legend.engine.shared.core.identity.Identity;
-import org.finos.legend.engine.shared.core.identity.factory.IdentityFactory;
 import org.finos.legend.engine.shared.core.kerberos.SubjectTools;
 import org.finos.legend.pure.m3.exception.PureExecutionException;
 import org.finos.legend.pure.m4.coreinstance.CoreInstance;
@@ -51,8 +50,7 @@ public static String doExecute(String jsonPlan, Map<String, Object> variables, M
                 .build();
 
         // execute plan
-        Result result = planExecutor.executeWithArgs(executeArgs);
-        try (AutoCloseable ignore = result::close)
+        try (Result result = planExecutor.executeWithArgs(executeArgs))
         {
             if (result instanceof StreamingResult)
             {
@@ -62,7 +60,7 @@ public static String doExecute(String jsonPlan, Map<String, Object> variables, M
             }
             else if (result instanceof ConstantResult)
             {
-                return ((ConstantResult) result).stream().toString();
+                return ((ConstantResult) result).stream();
             }
             else
             {