fix double quoted-prettified json in experiments API

src/main/java/eu/hbp/mip/controllers/ExperimentApi.java

@@ -101,7 +101,7 @@ public class ExperimentApi {
             }
         } catch (MalformedURLException mue) { LOGGER.trace(mue.getMessage()); } // ignore
 
-        return new ResponseEntity<>(gson.toJson(experiment), HttpStatus.OK);
+        return new ResponseEntity<>(gson.toJson(experiment.jsonify()), HttpStatus.OK);
     }
 
     @ApiOperation(value = "get an experiment", response = Experiment.class)
@@ -126,7 +126,7 @@ public class ExperimentApi {
             return new ResponseEntity<>("Not found", HttpStatus.NOT_FOUND);
         }
 
-        return new ResponseEntity<>(gson.toJson(experiment), HttpStatus.OK);
+        return new ResponseEntity<>(gson.toJson(experiment.jsonify()), HttpStatus.OK);
     }
 
     @ApiOperation(value = "Mark an experiment as viewed", response = Experiment.class)
@@ -154,7 +154,7 @@ public class ExperimentApi {
 
         LOGGER.info("Experiment updated (marked as viewed)");
 
-        return new ResponseEntity<>(gson.toJson(experiment), HttpStatus.OK);
+        return new ResponseEntity<>(gson.toJson(experiment.jsonify()), HttpStatus.OK);
     }
 
     @ApiOperation(value = "Mark an experiment as shared", response = Experiment.class)
@@ -282,7 +282,7 @@ public class ExperimentApi {
 
         LOGGER.info("Experiment updated (marked as shared)");
 
-        return new ResponseEntity<>(gson.toJson(experiment), HttpStatus.OK);
+        return new ResponseEntity<>(gson.toJson(experiment.jsonify()), HttpStatus.OK);
     }
 
     private void sendExperiment(Experiment experiment) throws MalformedURLException {

src/main/java/eu/hbp/mip/model/Experiment.java

 package eu.hbp.mip.model;
 
-import com.google.gson.Gson;
-import com.google.gson.GsonBuilder;
-import com.google.gson.JsonArray;
-import com.google.gson.JsonObject;
+import com.google.gson.*;
 import com.google.gson.annotations.Expose;
 import org.apache.log4j.Logger;
 import org.hibernate.annotations.Cascade;
 
 import javax.persistence.*;
-import java.util.*;
+import java.util.Date;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.UUID;
 
 /**
  * Created by habfast on 21/04/16.
@@ -137,6 +137,34 @@ public class Experiment {
         return new Gson().toJson(queryElements);
     }
 
+    public JsonObject jsonify() {
+        JsonObject exp = new Gson().toJsonTree(this).getAsJsonObject();
+        JsonParser parser = new JsonParser();
+
+        if (this.algorithms != null)
+        {
+            exp.remove("algorithms");
+            JsonArray jsonAlgorithms = parser.parse(this.algorithms).getAsJsonArray();
+            exp.add("algorithms", jsonAlgorithms);
+        }
+
+        if (this.validations != null)
+        {
+            exp.remove("validations");
+            JsonArray jsonValidations = parser.parse(this.validations).getAsJsonArray();
+            exp.add("validations", jsonValidations);
+        }
+
+        if (this.result != null)
+        {
+            exp.remove("result");
+            JsonArray jsonResult = parser.parse(this.result).getAsJsonArray();
+            exp.add("result", jsonResult);
+        }
+
+        return exp;
+    }
+
     public String getValidations() {
         return validations;
     }