From 8c11eeb20e1370295041d039941e1504d9162b0f Mon Sep 17 00:00:00 2001
From: Kumar Chandrakant <kchandrakant@gmail.com>
Date: Wed, 4 Sep 2019 19:07:13 +0530
Subject: [PATCH] Java blockchain (#7694)

* Adding source code for the article tracked under BAEL-3232.

* Incorporated the review comments on the article.
---
 .../src/main/java/com/baeldung/blockchain/Block.java       | 5 ++---
 .../java/com/baeldung/blockchain/BlockchainUnitTest.java   | 7 ++++---
 pom.xml                                                    | 2 +-
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/java-blockchain/src/main/java/com/baeldung/blockchain/Block.java b/java-blockchain/src/main/java/com/baeldung/blockchain/Block.java
index 264e3c4b69..6b4e971cd7 100644
--- a/java-blockchain/src/main/java/com/baeldung/blockchain/Block.java
+++ b/java-blockchain/src/main/java/com/baeldung/blockchain/Block.java
@@ -3,7 +3,6 @@ package com.baeldung.blockchain;
 import java.io.UnsupportedEncodingException;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
-import java.util.Date;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
@@ -17,10 +16,10 @@ public class Block {
     private long timeStamp;
     private int nonce;
 
-    public Block(String data, String previousHash) {
+    public Block(String data, String previousHash, long timeStamp) {
         this.data = data;
         this.previousHash = previousHash;
-        this.timeStamp = new Date().getTime();
+        this.timeStamp = timeStamp;
         this.hash = calculateBlockHash();
     }
 
diff --git a/java-blockchain/src/test/java/com/baeldung/blockchain/BlockchainUnitTest.java b/java-blockchain/src/test/java/com/baeldung/blockchain/BlockchainUnitTest.java
index acbf651e78..883e55c351 100644
--- a/java-blockchain/src/test/java/com/baeldung/blockchain/BlockchainUnitTest.java
+++ b/java-blockchain/src/test/java/com/baeldung/blockchain/BlockchainUnitTest.java
@@ -3,6 +3,7 @@ package com.baeldung.blockchain;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.util.ArrayList;
+import java.util.Date;
 import java.util.List;
 
 import org.junit.AfterClass;
@@ -17,10 +18,10 @@ public class BlockchainUnitTest {
 
     @BeforeClass
     public static void setUp() {
-        Block genesisBlock = new Block("The is the Genesis Block.", "0");
+        Block genesisBlock = new Block("The is the Genesis Block.", "0", new Date().getTime());
         genesisBlock.mineBlock(prefix);
         blockchain.add(genesisBlock);
-        Block firstBlock = new Block("The is the First Block.", genesisBlock.getHash());
+        Block firstBlock = new Block("The is the First Block.", genesisBlock.getHash(), new Date().getTime());
         firstBlock.mineBlock(prefix);
         blockchain.add(firstBlock);
     }
@@ -28,7 +29,7 @@ public class BlockchainUnitTest {
     @Test
     public void givenBlockchain_whenNewBlockAdded_thenSuccess() {
         Block newBlock = new Block("The is a New Block.", blockchain.get(blockchain.size() - 1)
-            .getHash());
+            .getHash(), new Date().getTime());
         newBlock.mineBlock(prefix);
         assertTrue(newBlock.getHash()
             .substring(0, prefix)
diff --git a/pom.xml b/pom.xml
index 005a24effa..81338b9f81 100644
--- a/pom.xml
+++ b/pom.xml
@@ -579,7 +579,7 @@
 				
 				<module>spring-boot-nashorn</module>
 				<module>java-blockchain</module>
-				<!-- <module>Twitter4J</module> --> <!-- Builds locally, but fails in Jenkins, Failed to parse POMs -->
+			
 			</modules>
 
 		</profile>