1.Error Messages:
Correct the classpath of your application so that it contains a single, compatible version of com.google.gson.GsonBuilder

Description:

An attempt was made to call a method that does not exist. The attempt was made from the following location:
    java.lang.invoke.MethodHandleNatives.resolve(Native Method)
The following method did not exist:
    com.google.gson.GsonBuilder.setLenient()Lcom/google/gson/GsonBuilder;
The method's class, com.google.gson.GsonBuilder, is available from the following locations:
    jar:file:/E:/smallTools/maven/rep/com/google/code/gson/gson/2.1/gson-2.1.jar!/com/google/gson/GsonBuilder.class
The class hierarchy was loaded from the following locations:
    com.google.gson.GsonBuilder: file:/E:/smallTools/maven/rep/com/google/code/gson/gson/2.1/gson-2.1.jar
Action:
Correct the classpath of your application so that it contains a single, compatible version of com.google.gson.GsonBuilder
Process finished with exit code 1

2. Solution

Add gson dependency

<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.6</version>
</dependency>