Update CalculatorResource.java

src/main/java/resources/CalculatorResource.java

@@ -21,7 +21,7 @@ public class CalculatorResource {
     @POST
     @Consumes(MediaType.TEXT_PLAIN)
     @Produces(MediaType.TEXT_PLAIN)
-    public int calculate(String expression){
+    public float calculate(String expression){
         // Removes all whitespaces
         String expressionTrimmed = expression.replaceAll("\\s+","");