🚀 Hyperledger Fabric Java Chaincode – Asset Tracker

This project contains a smart contract written in Java for managing and tracking assets on a Hyperledger Fabric blockchain network. Developed as part of an internship assignment.

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📦 Features

• Create an asset
• Read an asset
• Update asset details
• Delete an asset

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🔐 Asset Fields

Each asset has the following fields:

• dealerId
• msisdn
• mpin
• balance
• status
• transAmount
• transType
• remarks

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🛠 Requirements

• Java 17+
• Gradle
• Docker & Docker Desktop
• WSL2 (for Windows users)
• Hyperledger Fabric v2.5+
• Fabric binaries (from install-fabric.sh)
• Git (to clone fabric-samples)

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🏗️ Project Structure

fabric-java-asset-tracker/ ├── build.gradle ├── settings.gradle ├── README.md └── src/ └── main/ └── java/ └── org/ └── example/ ├── Asset.java └── AssetContract.java

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⚙️ Build & Deploy Instructions

1️⃣ Build the Chaincode JAR

./gradlew build
This generates a .jar file inside build/libs/.

2️⃣ Start Fabric Test Network
From inside the fabric-samples/test-network directory:

./network.sh up createChannel -ca

3️⃣ Deploy the Chaincode
Replace the path with your JAR location:

./network.sh deployCC -ccn assetcontract \
  -ccp ../fabric-java-asset-tracker/build/libs \
  -ccl java
🧪 Test Your Chaincode

🔁 Set Org1 CLI Environment

export PATH=${PWD}/../bin:$PATH
export FABRIC_CFG_PATH=$PWD/../config
export CORE_PEER_TLS_ENABLED=true
export CORE_PEER_LOCALMSPID=Org1MSP
export CORE_PEER_TLS_ROOTCERT_FILE=${PWD}/organizations/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/tls/ca.crt
export CORE_PEER_MSPCONFIGPATH=${PWD}/organizations/peerOrganizations/org1.example.com/users/Admin@org1.example.com/msp
export CORE_PEER_ADDRESS=localhost:7051
➕ Invoke createAsset

peer chaincode invoke -o localhost:7050 --ordererTLSHostnameOverride orderer.example.com \
--tls --cafile "${PWD}/organizations/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem" \
-C mychannel -n assetcontract \
--peerAddresses localhost:7051 --tlsRootCertFiles "${PWD}/organizations/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/tls/ca.crt" \
--peerAddresses localhost:9051 --tlsRootCertFiles "${PWD}/organizations/peerOrganizations/org2.example.com/peers/peer0.org2.example.com/tls/ca.crt" \
-c '{"function":"createAsset","Args":["DLR001","9876543210","1234","5000","active","0","credit","init"]}'

🔍 Query the Asset

peer chaincode query -C mychannel -n assetcontract -c '{"Args":["readAsset","DLR001"]}'