Fixed BUG-37424

client/src/main/java/org/apache/hadoop/metadata/MetadataServiceClient.java

@@ -55,6 +55,7 @@ public class MetadataServiceClient {
 
     public static final String DEFINITION = "definition";
     public static final String ERROR = "error";
+    public static final String STACKTRACE = "stackTrace";
     public static final String REQUEST_ID = "requestId";
     public static final String RESULTS = "results";
     public static final String COUNT = "count";

repository/src/main/java/org/apache/hadoop/metadata/repository/typestore/GraphBackedTypeStore.java

@@ -188,7 +188,7 @@ public class GraphBackedTypeStore implements ITypeStore {
                 break;
 
             default:
-                throw new IllegalArgumentException("Unhandled type category " + attrDataType.getTypeCategory());
+                throw new IllegalArgumentException("Attribute cannot reference instances of type : " + attrDataType.getTypeCategory());
         }
 
         for (IDataType attrType : attrDataTypes) {

webapp/src/main/java/org/apache/hadoop/metadata/web/util/Servlets.java

@@ -30,6 +30,7 @@ import javax.servlet.http.HttpServletRequest;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import java.io.IOException;
+import java.io.PrintWriter;
 import java.io.StringWriter;
 
 /**
@@ -98,7 +99,20 @@ public final class Servlets {
     }
 
     public static Response getErrorResponse(Throwable e, Response.Status status) {
-        return getErrorResponse(e.getMessage(), status);
+        Response response = getErrorResponse(e.getMessage(), status);
+        JSONObject responseJson = (JSONObject) response.getEntity();
+        try {
+            responseJson.put(MetadataServiceClient.STACKTRACE, printStackTrace(e));
+        } catch (JSONException e1) {
+            LOG.warn("Could not construct error Json rensponse", e1);
+        }
+        return response;
+    }
+
+    private static String printStackTrace(Throwable t) {
+        StringWriter sw = new StringWriter();
+        t.printStackTrace(new PrintWriter(sw));
+        return sw.toString();
     }
 
     public static Response getErrorResponse(String message, Response.Status status) {
@@ -108,7 +122,7 @@ public final class Servlets {
             errorJson.put(MetadataServiceClient.ERROR, errorEntity);
             errorEntity = errorJson;
         } catch (JSONException jsonE) {
-            LOG.warn("Could not construct error Json rensponse");
+            LOG.warn("Could not construct error Json rensponse", jsonE);
         }
         return Response
                 .status(status)

webapp/src/test/java/org/apache/hadoop/metadata/web/resources/EntityJerseyResourceIT.java

@@ -199,6 +199,7 @@ public class EntityJerseyResourceIT extends BaseResourceIT {
 
         JSONObject response = new JSONObject(responseAsString);
         Assert.assertNotNull(response.get(MetadataServiceClient.ERROR));
+        Assert.assertNotNull(response.get(MetadataServiceClient.STACKTRACE));
     }
 
     @Test(dependsOnMethods = "testSubmitEntity")
@@ -238,6 +239,7 @@ public class EntityJerseyResourceIT extends BaseResourceIT {
 
         JSONObject response = new JSONObject(responseAsString);
         Assert.assertNotNull(response.get(MetadataServiceClient.ERROR));
+        Assert.assertNotNull(response.get(MetadataServiceClient.STACKTRACE));
     }
 
     @Test
@@ -395,6 +397,7 @@ public class EntityJerseyResourceIT extends BaseResourceIT {
 
         JSONObject response = new JSONObject(responseAsString);
         Assert.assertNotNull(response.get(MetadataServiceClient.ERROR));
+        Assert.assertNotNull(response.get(MetadataServiceClient.STACKTRACE));
     }
 
     private void createHiveTypes() throws Exception {