Check Linked List is Palindrome

package org.wesome.dsalgo;

import lombok.Data;

import java.util.Objects;
import java.util.Stack;

public class LinkedList {
    static Node head;
    static int size = 0;

    static boolean palindrome() {
        System.out.println("LinkedList.palindrome");
        Node slow = head;
        Node fast = head;
        Stack<Integer> stack = new Stack<>();
        while (fast != null && fast.next != null) {
            stack.push(slow.data);
            slow = slow.next;
            fast = fast.next.next;
        }
        if (fast != null) {
            slow = slow.next;
        }
        while (slow != null) {
            if (stack.pop().intValue() != slow.data) {
                System.out.println("LinkedList is not palindrome");
                return false;
            }
            slow = slow.next;
        }
        System.out.println("LinkedList is palindrome");
        return true;
    }

    //this method print the list using loop
    static void printIteratively() {
        System.out.println("LinkedList.printIteratively");
        if (Objects.isNull(head)) {
            System.out.println("Linked List is null = " + head);
            return;
        }
        Node tempNode = head;
        System.out.println("Linked List Size is " + size);
        while (Objects.nonNull(tempNode)) {
            System.out.println("Node = " + tempNode.data);
            tempNode = tempNode.next;
        }
    }

    static void addInLast(int element) {
        System.out.println("LinkedList.addInLast " + element);
        Node newNode = new Node(element);
        if (Objects.isNull(head)) {
            head = newNode;
            return;
        }
        Node tempNode = head;
        while (Objects.nonNull(tempNode.next)) {
            tempNode = tempNode.next;
        }
        tempNode.next = newNode;
        size++;
    }
}

@Data
class Node {
    int data;
    Node next;

    public Node(int data) {
        this.data = data;
    }
}

package org.wesome.dsalgo;

import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;

import static org.wesome.dsalgo.LinkedList.printIteratively;

public class LinkedListTest {
    @Test
    void palindromeTest() {
        addInLast();
        printIteratively();
        Assertions.assertTrue(LinkedList.palindrome());
    }

    void addInLast() {
        LinkedList.addInLast(1);
        LinkedList.addInLast(2);
        LinkedList.addInLast(3);
        LinkedList.addInLast(3);
        LinkedList.addInLast(2);
        LinkedList.addInLast(1);
    }
}

plugins {
    id 'java'
    id "io.freefair.lombok" version "6.2.0"
}

group = 'org.wesome'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = JavaVersion.VERSION_1_8

configurations {
    compileOnly {
        extendsFrom annotationProcessor
    }
}

repositories {
    mavenCentral()
}

dependencies {
    testImplementation 'org.junit.jupiter:junit-jupiter:5.6.2'
}

test {
    useJUnitPlatform()
}