Support convert normal object as parsed json tree

json-path/src/main/java/com/jayway/jsonpath/internal/ParseContextImpl.java

@@ -28,7 +28,8 @@ public class ParseContextImpl implements ParseContext {
     @Override
     public DocumentContext parse(Object json) {
         notNull(json, "json object can not be null");
-        return new JsonContext(json, configuration);
+        Object obj = configuration.jsonProvider().parse(json);
+        return new JsonContext(obj, configuration);
     }
 
     @Override

json-path/src/main/java/com/jayway/jsonpath/spi/json/GsonJsonProvider.java

@@ -119,6 +119,11 @@ public class GsonJsonProvider extends AbstractJsonProvider {
         return unwrapped;
     }
 
+    @Override
+    public Object parse(Object object) throws InvalidJsonException {
+        return object instanceof JsonElement ? object : gson.toJsonTree(object);
+    }
+
     @Override
     public Object parse(final String json) throws InvalidJsonException {
         return PARSER.parse(json);

json-path/src/main/java/com/jayway/jsonpath/spi/json/JacksonJsonNodeJsonProvider.java

@@ -45,6 +45,11 @@ public class JacksonJsonNodeJsonProvider extends AbstractJsonProvider {
         this.objectMapper = objectMapper;
     }
 
+    @Override
+    public Object parse(Object object) throws InvalidJsonException {
+        return object instanceof JsonNode ? object : objectMapper.valueToTree(object);
+    }
+
     @Override
     public Object parse(String json) throws InvalidJsonException {
         try {

json-path/src/main/java/com/jayway/jsonpath/spi/json/JsonProvider.java

@@ -23,6 +23,16 @@ public interface JsonProvider {
 
     static final Object UNDEFINED = new Object();
 
+    /**
+     * Convert the given object as a parsed json object
+     * @param object object to parse
+     * @return The parsed json object
+     * @throws InvalidJsonException
+     */
+    default Object parse(Object object) throws InvalidJsonException {
+        return object;
+    }
+
     /**
      * Parse the given json string
      * @param json json string to parse