Introduction video to web3j
https://www.youtube.com/watch?v=ea3miXs_P6Y
https://geth.ethereum.org/docs/install-and-build/installing-geth#most-linux-systems-and-macos
Web3j
https://web3j.io/
https://github.com/web3j/web3j
Compile geth client
Start geth client
Geth client running
Connect to client using https://web3j.io/
Web3j code samples
https://github.com/web3j/examples/blob/master/rx/src/main/java/org/web3j/examples/rx/Main.java
Maven sample project
https://github.com/JacqMT/web3j-maven-example/blob/master/pom.xml
Clone sample project
Compile test project using
Display version of Ethereum geth client
Download web3j CLI tools
https://github.com/web3j/web3j/releases/tag/v3.2.0
Create wallet
Check transactions on testnet
https://rinkeby.etherscan.io/address/
Getting ether from https://www.rinkeby.io/ "Crypto Faucet"https://www.youtube.com/watch?v=ea3miXs_P6Y
Blockchain - Using cryptocurrency with Java
http://www.javamagazine.mozaicreader.com/JanFeb2017/Default/36/0#&pageSet=36&page=0&contentItem=0
Reactive-Functional Fun on the Blockchain with web3j
https://community.oracle.com/docs/DOC-1011373Ethereum Geth client
Web3j
https://web3j.io/
https://github.com/web3j/web3j
Install Ethereum client
Get Golang and geth codednf install golang
git clone https://github.com/ethereum/go-ethereum.gitCompile geth client
[dave@localhost go-ethereum]$ make
build/env.sh go run build/ci.go install ./cmd/geth
>>> /usr/lib/golang/bin/go install -ldflags -X main.gitCommit=0662384d294eaa44390799747db030e8d401111d -v ./cmd/geth
github.com/ethereum/go-ethereum/common/hexutil
github.com/ethereum/go-ethereum/crypto/sha3
github.com/ethereum/go-ethereum/common/math
github.com/ethereum/go-ethereum/rlp
github.com/ethereum/go-ethereum/crypto/secp256k1
github.com/ethereum/go-ethereum/vendor/github.com/go-stack/stack
github.com/ethereum/go-ethereum/log
github.com/ethereum/go-ethereum/vendor/github.com/rcrowley/go-metrics
github.com/ethereum/go-ethereum/vendor/gopkg.in/karalabe/cookiejar.v2/collections/prque
github.com/ethereum/go-ethereum/common
github.com/ethereum/go-ethereum/vendor/github.com/aristanetworks/goarista/monotime
github.com/ethereum/go-ethereum/common/mclock
github.com/ethereum/go-ethereum/event
github.com/ethereum/go-ethereum/params
github.com/ethereum/go-ethereum/crypto/randentropy
github.com/ethereum/go-ethereum/vendor/github.com/pborman/uuid
github.com/ethereum/go-ethereum/vendor/golang.org/x/sys/unix
github.com/ethereum/go-ethereum/vendor/golang.org/x/crypto/pbkdf2
github.com/ethereum/go-ethereum/vendor/golang.org/x/crypto/scrypt
github.com/ethereum/go-ethereum/vendor/gopkg.in/fatih/set.v0
github.com/ethereum/go-ethereum/cmd/internal/browser
github.com/ethereum/go-ethereum/common/fdlimit
github.com/ethereum/go-ethereum/vendor/github.com/rcrowley/go-metrics/exp
github.com/ethereum/go-ethereum/vendor/github.com/syndtr/goleveldb/leveldb/util
github.com/ethereum/go-ethereum/metrics
github.com/ethereum/go-ethereum/vendor/github.com/syndtr/goleveldb/leveldb/cache
github.com/ethereum/go-ethereum/vendor/github.com/syndtr/goleveldb/leveldb/comparer
github.com/ethereum/go-ethereum/vendor/github.com/syndtr/goleveldb/leveldb/storage
github.com/ethereum/go-ethereum/vendor/github.com/syndtr/goleveldb/leveldb/filter
github.com/ethereum/go-ethereum/vendor/github.com/syndtr/goleveldb/leveldb/opt
github.com/ethereum/go-ethereum/vendor/github.com/golang/snappy
github.com/ethereum/go-ethereum/vendor/github.com/rjeczalik/notify
github.com/ethereum/go-ethereum/vendor/github.com/hashicorp/golang-lru/simplelru
github.com/ethereum/go-ethereum/vendor/github.com/syndtr/goleveldb/leveldb/errors
github.com/ethereum/go-ethereum/vendor/github.com/syndtr/goleveldb/leveldb/iterator
github.com/ethereum/go-ethereum/vendor/github.com/syndtr/goleveldb/leveldb/journal
github.com/ethereum/go-ethereum/vendor/github.com/hashicorp/golang-lru
github.com/ethereum/go-ethereum/vendor/github.com/syndtr/goleveldb/leveldb/memdb
github.com/ethereum/go-ethereum/vendor/github.com/syndtr/goleveldb/leveldb/table
github.com/ethereum/go-ethereum/vendor/golang.org/x/net/context
github.com/ethereum/go-ethereum/vendor/github.com/rs/xhandler
github.com/ethereum/go-ethereum/vendor/golang.org/x/net/websocket
github.com/ethereum/go-ethereum/vendor/github.com/rs/cors
github.com/ethereum/go-ethereum/vendor/github.com/edsrzf/mmap-go
github.com/ethereum/go-ethereum/vendor/github.com/syndtr/goleveldb/leveldb
github.com/ethereum/go-ethereum/common/bitutil
github.com/ethereum/go-ethereum/crypto/bn256
github.com/ethereum/go-ethereum/rpc
github.com/ethereum/go-ethereum/vendor/golang.org/x/crypto/ripemd160
github.com/ethereum/go-ethereum/vendor/github.com/elastic/gosigar
github.com/ethereum/go-ethereum/vendor/github.com/huin/goupnp/httpu
github.com/ethereum/go-ethereum/vendor/github.com/huin/goupnp/scpd
github.com/ethereum/go-ethereum/vendor/github.com/huin/goupnp/soap
github.com/ethereum/go-ethereum/vendor/github.com/huin/goupnp/ssdp
github.com/ethereum/go-ethereum/ethdb
github.com/ethereum/go-ethereum/vendor/golang.org/x/net/html/atom
github.com/ethereum/go-ethereum/vendor/golang.org/x/text/encoding/internal/identifier
github.com/ethereum/go-ethereum/vendor/golang.org/x/text/transform
github.com/ethereum/go-ethereum/vendor/golang.org/x/net/html
github.com/ethereum/go-ethereum/vendor/golang.org/x/text/internal/utf8internal
github.com/ethereum/go-ethereum/vendor/golang.org/x/text/internal/tag
github.com/ethereum/go-ethereum/vendor/golang.org/x/text/encoding
github.com/ethereum/go-ethereum/vendor/golang.org/x/text/runes
github.com/ethereum/go-ethereum/vendor/golang.org/x/text/encoding/internal
github.com/ethereum/go-ethereum/vendor/golang.org/x/text/language
github.com/ethereum/go-ethereum/vendor/golang.org/x/text/encoding/charmap
github.com/ethereum/go-ethereum/vendor/golang.org/x/text/encoding/japanese
github.com/ethereum/go-ethereum/vendor/golang.org/x/text/encoding/korean
github.com/ethereum/go-ethereum/vendor/golang.org/x/text/encoding/simplifiedchinese
github.com/ethereum/go-ethereum/vendor/golang.org/x/text/encoding/traditionalchinese
github.com/ethereum/go-ethereum/vendor/golang.org/x/text/encoding/unicode
github.com/ethereum/go-ethereum/vendor/github.com/jackpal/go-nat-pmp
github.com/ethereum/go-ethereum/p2p/netutil
github.com/ethereum/go-ethereum/eth/tracers/internal/tracers
github.com/ethereum/go-ethereum/vendor/gopkg.in/olebedev/go-duktape.v3
github.com/ethereum/go-ethereum/vendor/github.com/golang/protobuf/proto
github.com/ethereum/go-ethereum/vendor/golang.org/x/text/encoding/htmlindex
github.com/ethereum/go-ethereum/vendor/golang.org/x/net/html/charset
github.com/ethereum/go-ethereum/vendor/github.com/huin/goupnp
github.com/ethereum/go-ethereum/vendor/github.com/huin/goupnp/dcps/internetgateway1
github.com/ethereum/go-ethereum/vendor/github.com/huin/goupnp/dcps/internetgateway2
github.com/ethereum/go-ethereum/vendor/github.com/golang/protobuf/protoc-gen-go/descriptor
github.com/ethereum/go-ethereum/p2p/nat
github.com/ethereum/go-ethereum/accounts/usbwallet/internal/trezor
github.com/ethereum/go-ethereum/vendor/github.com/karalabe/hid
github.com/ethereum/go-ethereum/log/term
github.com/ethereum/go-ethereum/vendor/github.com/mattn/go-colorable
github.com/ethereum/go-ethereum/vendor/gopkg.in/urfave/cli.v1
github.com/ethereum/go-ethereum/internal/debug
github.com/ethereum/go-ethereum/vendor/github.com/prometheus/prometheus/util/flock
github.com/ethereum/go-ethereum/les/flowcontrol
github.com/ethereum/go-ethereum/vendor/golang.org/x/sync/syncmap
github.com/ethereum/go-ethereum/internal/jsre/deps
github.com/ethereum/go-ethereum/vendor/github.com/mattn/go-isatty
github.com/ethereum/go-ethereum/vendor/github.com/fatih/color
# github.com/ethereum/go-ethereum/vendor/gopkg.in/olebedev/go-duktape.v3
In file included from vendor/gopkg.in/olebedev/go-duktape.v3/api.go:7:0:
vendor/gopkg.in/olebedev/go-duktape.v3/api.go: In function ‘_duk_error’:
vendor/gopkg.in/olebedev/go-duktape.v3/duktape.h:510:127: warning: right-hand operand of comma expression has no effect [-Wunused-value]
(duk_error_raw((ctx), (duk_errcode_t) (err_code), (const char *) (DUK_FILE_MACRO), (duk_int_t) (DUK_LINE_MACRO), __VA_ARGS__), (duk_ret_t) 0)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
vendor/gopkg.in/olebedev/go-duktape.v3/api.go:153:2: note: in expansion of macro ‘duk_error’
duk_error(ctx, err_code, "%s", str);
^~~~~~~~~
github.com/ethereum/go-ethereum/vendor/gopkg.in/sourcemap.v1/base64vlq
github.com/ethereum/go-ethereum/vendor/gopkg.in/sourcemap.v1
github.com/ethereum/go-ethereum/vendor/github.com/robertkrimen/otto/file
github.com/ethereum/go-ethereum/vendor/github.com/robertkrimen/otto/token
github.com/ethereum/go-ethereum/vendor/github.com/robertkrimen/otto/ast
github.com/ethereum/go-ethereum/vendor/github.com/robertkrimen/otto/dbg
github.com/ethereum/go-ethereum/vendor/github.com/robertkrimen/otto/parser
github.com/ethereum/go-ethereum/vendor/github.com/robertkrimen/otto/registry
github.com/ethereum/go-ethereum/vendor/github.com/robertkrimen/otto
github.com/ethereum/go-ethereum/crypto
github.com/ethereum/go-ethereum/trie
github.com/ethereum/go-ethereum/core/types
github.com/ethereum/go-ethereum/crypto/ecies
github.com/ethereum/go-ethereum/p2p/discover
github.com/ethereum/go-ethereum
github.com/ethereum/go-ethereum/accounts
github.com/ethereum/go-ethereum/accounts/keystore
github.com/ethereum/go-ethereum/core/state
github.com/ethereum/go-ethereum/core/vm
github.com/ethereum/go-ethereum/p2p/discv5
github.com/ethereum/go-ethereum/consensus
github.com/ethereum/go-ethereum/consensus/misc
github.com/ethereum/go-ethereum/consensus/clique
github.com/ethereum/go-ethereum/consensus/ethash
github.com/ethereum/go-ethereum/core
github.com/ethereum/go-ethereum/p2p
github.com/ethereum/go-ethereum/core/bloombits
github.com/ethereum/go-ethereum/eth/fetcher
github.com/ethereum/go-ethereum/accounts/usbwallet
github.com/ethereum/go-ethereum/dashboard
github.com/ethereum/go-ethereum/node
github.com/ethereum/go-ethereum/whisper/whisperv5
github.com/ethereum/go-ethereum/eth/downloader
github.com/ethereum/go-ethereum/eth/filters
github.com/ethereum/go-ethereum/light
github.com/ethereum/go-ethereum/internal/jsre
github.com/ethereum/go-ethereum/internal/ethapi
github.com/ethereum/go-ethereum/miner
github.com/ethereum/go-ethereum/internal/web3ext
github.com/ethereum/go-ethereum/vendor/github.com/peterh/liner
github.com/ethereum/go-ethereum/eth/gasprice
github.com/ethereum/go-ethereum/ethclient
github.com/ethereum/go-ethereum/vendor/github.com/maruel/panicparse/stack
github.com/ethereum/go-ethereum/console
github.com/ethereum/go-ethereum/vendor/github.com/mattn/go-runewidth
github.com/ethereum/go-ethereum/vendor/github.com/mitchellh/go-wordwrap
github.com/ethereum/go-ethereum/vendor/github.com/nsf/termbox-go
github.com/ethereum/go-ethereum/vendor/github.com/naoina/go-stringutil
github.com/ethereum/go-ethereum/vendor/github.com/naoina/toml/ast
github.com/ethereum/go-ethereum/vendor/github.com/gizak/termui
github.com/ethereum/go-ethereum/vendor/github.com/naoina/toml
github.com/ethereum/go-ethereum/eth/tracers
github.com/ethereum/go-ethereum/eth
github.com/ethereum/go-ethereum/les
github.com/ethereum/go-ethereum/ethstats
github.com/ethereum/go-ethereum/cmd/utils
github.com/ethereum/go-ethereum/cmd/geth
Done building.
Run "/home/dave/github/go-ethereum/build/bin/geth" to launch geth.
Start geth client
[dave@localhost go-ethereum]$ /home/dave/github/go-ethereum/build/bin/geth --fast --cache=512 --rpcapi personal,db,eth,net,web3 --rpc --testnet
INFO [02-04|06:34:54] Starting peer-to-peer node instance=Geth/v1.8.0-unstable-0662384d/linux-amd64/go1.8.5
INFO [02-04|06:34:54] Allocated cache and file handles database=/home/dave/.ethereum/testnet/geth/chaindata cache=512 handles=512
INFO [02-04|06:34:55] Writing custom genesis block
INFO [02-04|06:34:55] Initialised chain configuration config="{ChainID: 3 Homestead: 0 DAO: <nil> DAOSupport: true EIP150: 0 EIP155: 10 EIP158: 10 Byzantium: 1700000 Engine: ethash}"
INFO [02-04|06:34:55] Disk storage enabled for ethash caches dir=/home/dave/.ethereum/testnet/geth/ethash count=3
INFO [02-04|06:34:55] Disk storage enabled for ethash DAGs dir=/home/dave/.ethash count=2
INFO [02-04|06:34:55] Initialising Ethereum protocol versions="[63 62]" network=3
INFO [02-04|06:34:55] Loaded most recent local header number=0 hash=419410…ca4a2d td=1048576
INFO [02-04|06:34:55] Loaded most recent local full block number=0 hash=419410…ca4a2d td=1048576
INFO [02-04|06:34:55] Loaded most recent local fast block number=0 hash=419410…ca4a2d td=1048576
INFO [02-04|06:34:55] Regenerated local transaction journal transactions=0 accounts=0
INFO [02-04|06:34:55] Starting P2P networking
INFO [02-04|06:34:57] UDP listener up self=enode://9bbc55ed1cca170be4cba9c3ea9e22322680d2f9cdd7e363591d2a6738e55707cb58fa64764c9b1ead28174dbec81ec5721cb2452e625de6292fe36881d672a2@89.233.189.164:30303
INFO [02-04|06:34:57] RLPx listener up self=enode://9bbc55ed1cca170be4cba9c3ea9e22322680d2f9cdd7e363591d2a6738e55707cb58fa64764c9b1ead28174dbec81ec5721cb2452e625de6292fe36881d672a2@89.233.189.164:30303
INFO [02-04|06:34:57] IPC endpoint opened: /home/dave/.ethereum/testnet/geth.ipc
INFO [02-04|06:34:57] HTTP endpoint opened: http://127.0.0.1:8545
Geth client running
INFO [02-04|07:06:39] Imported new state entries count=273 elapsed=8.868µs processed=273 pending=4369 retry=0 duplicate=0 unexpected=0
INFO [02-04|07:06:39] Imported new block headers count=0 elapsed=8.269ms number=83814 hash=94033d…457655 ignored=192
INFO [02-04|07:06:39] Imported new block receipts count=4 elapsed=659.004µs bytes=3957 number=83626 hash=ba23b3…b7e218 ignored=0
INFO [02-04|07:06:40] Imported new block receipts count=33 elapsed=4.361ms bytes=33409 number=83659 hash=5eb979…3e5a58 ignored=0
INFO [02-04|07:06:40] Imported new block headers count=0 elapsed=7.208ms number=84006 hash=aee4cb…1bb757 ignored=192
INFO [02-04|07:06:40] Imported new block receipts count=155 elapsed=35.627ms bytes=89944 number=83814 hash=94033d…457655 ignored=0
INFO [02-04|07:06:40] Imported new block receipts count=192 elapsed=9.058ms bytes=130405 number=84006 hash=aee4cb…1bb757 ignored=0
Connect to client using https://web3j.io/
Web3j code samples
https://github.com/web3j/examples/blob/master/rx/src/main/java/org/web3j/examples/rx/Main.java
Maven sample project
https://github.com/JacqMT/web3j-maven-example/blob/master/pom.xml
Clone sample project
git clone https://github.com/JacqMT/web3j-maven-exampleCompile test project using
[dave@localhost web3j-maven-example]$ mvn install
[INFO] Scanning for projects...
[WARNING]
[[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building web3j-maven-example 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ web3j-maven-example ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory /home/dave/github/web3j-maven-example/src/main/resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ web3j-maven-example ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!
[INFO] Compiling 4 source files to /home/dave/github/web3j-maven-example/target/classes
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ web3j-maven-example ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory /home/dave/github/web3j-maven-example/src/test/resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ web3j-maven-example ---
[INFO] No sources to compile
[INFO]
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ web3j-maven-example ---
[INFO] No tests to run.
[INFO]
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ web3j-maven-example ---
[INFO] Building jar: /home/dave/github/web3j-maven-example/target/web3j-maven-example-1.0-SNAPSHOT.jar
[INFO]
[INFO] --- maven-install-plugin:2.4:install (default-install) @ web3j-maven-example ---
[INFO] Installing /home/dave/github/web3j-maven-example/target/web3j-maven-example-1.0-SNAPSHOT.jar to /home/dave/.m2/repository/org/train/web3j-maven-example/1.0-SNAPSHOT/web3j-maven-example-1.0-SNAPSHOT.jar
[INFO] Installing /home/dave/github/web3j-maven-example/pom.xml to /home/dave/.m2/repository/org/train/web3j-maven-example/1.0-SNAPSHOT/web3j-maven-example-1.0-SNAPSHOT.pom
[dave@localhost web3j-maven-example]$ ls -R
.:
contracts LICENSE pom.xml README.md src tutorial-images
./contracts:
build solidity
./contracts/build:
greeter.abi greeter.bin mortal.abi mortal.bin
./contracts/solidity:
Greeter.sol
./src:
main
./src/main:
java
./src/main/java:
org
./src/main/java/org:
train web3j
./src/main/java/org/train:
FundsService.java Greeting.java VersionFinder.java
./src/main/java/org/web3j:
example
./src/main/java/org/web3j/example:
generated
./src/main/java/org/web3j/example/generated:
Greeter.java
./tutorial-images:
'Generate a Wallet.png' 'Rinkeby EtherScan.png' 'Setting Contract Value Output.png'
'Greetings Output.png' 'Rinkeby Faucet.png' 'Starting Local Ethereum Node.png'
'Local Node Sync Status.png' 'Sending Funds Local Node Log.png' 'VersionFinder Output.png'
'Rinkeby EtherScan Overview.png' 'Sending Funds Output.png'
Display version of Ethereum geth client
[dave@localhost web3j-maven-example]$ mvn exec:java -Dexec.mainClass="org.train.VersionFinder"
Client version: Geth/v1.8.0-unstable-0662384d/linux-amd64/go1.8.5
Network version: 3Download web3j CLI tools
https://github.com/web3j/web3j/releases/tag/v3.2.0
Create wallet
[dave@localhost bin]$ ./web3j wallet create
_ _____ _ _
| | |____ (_) (_)
__ _____| |__ / /_ _ ___
\ \ /\ / / _ \ '_ \ \ \ | | | / _ \
\ V V / __/ |_) |.___/ / | _ | || (_) |
\_/\_/ \___|_.__/ \____/| |(_)|_| \___/
_/ |
|__/
Please enter a wallet file password:
Please re-enter the password:
Please enter a destination directory location [/home/dave/.ethereum/testnet/keystore]:
Wallet file UTC--2018-02-04T06-34-14.95000000Z--1234567890123456789012345678.json successfully created in: /home/dave/.ethereum/testnet/keystore
Check transactions on testnet
https://rinkeby.etherscan.io/address/
https://gist.github.com/cryptogoth/10a98e8078cfd69f7ca892ddbdcf26bc
Post wallet id on Google+ and then go to
https://www.rinkeby.io/#faucet
Check if Ether transaction is properly finished on https://rinkeby.etherscan.io/address/
Transaction Information
TxHash:
0xTX_HASH
TxReceipt Status: Success
Block Height: 1710713 (102 block confirmations)
TimeStamp: 25 mins ago (Feb-04-2018 07:48:00 AM +UTC)
From: 0xTO_WALLET_ADDRESS
To:0xFROM_WALLET_ADDRESS
Value: 3 Ether ($0.00)
Gas Limit: 21000
Gas Used By Txn: 21000
Gas Price: 0.000000004 Ether (4 Gwei)
Actual Tx Cost/Fee: 0.000084 Ether ($0.000000)
Cumulative Gas Used: 21000
Nonce: 5246 Block information
Block Information
Height:
1710713
TimeStamp: 1 hr 4 mins ago (Feb-04-2018 07:48:00 AM +UTC)
Transactions: 2 transactions and 0 contract internal transactions in this block
Hash: 0xTX_HASH
Parent Hash: 0xPARENT_TX_HASH
Sha3Uncles: 0x1dcc4de8dec75d7aa45645645651b948a7413f0a142fd40d49347
Mined By: 0xfc18cbc391de84dbd87466689f5dd91 in 15 secs
Difficulty: 2
Total Difficulty: 3,188,999
Size: 864 bytes
Gas Used: 5,033,664 (71.90%)
Gas Limit: 7,001,200
Nonce: 0x0000000000000000
Block Reward: 0 Ether
Uncles Reward:
Fully synchronize geth client
dave@localhost go-ethereum]$ /home/dave/github/go-ethereum/build/bin/geth --fast --cache=512 --rpcapi personal,db,eth,net,web3 --rpc --testnet
INFO [02-04|09:33:58] Starting peer-to-peer node instance=Geth/v1.8.0-unstable-0662384d/linux-amd64/go1.8.5
INFO [02-04|09:33:58] Allocated cache and file handles database=/home/dave/.ethereum/testnet/geth/chaindata cache=512 handles=512
INFO [02-04|09:34:00] Initialised chain configuration config="{ChainID: 3 Homestead: 0 DAO: <nil> DAOSupport: true EIP150: 0 EIP155: 10 EIP158: 10 Byzantium: 1700000 Engine: ethash}"
INFO [02-04|09:34:00] Disk storage enabled for ethash caches dir=/home/dave/.ethereum/testnet/geth/ethash count=3
INFO [02-04|09:34:00] Disk storage enabled for ethash DAGs dir=/home/dave/.ethash count=2
INFO [02-04|09:34:01] Initialising Ethereum protocol versions="[63 62]" network=3
INFO [02-04|09:34:01] Loaded most recent local header number=926234 hash=a2bb1a…990d6c td=642817207095421
INFO [02-04|09:34:01] Loaded most recent local full block number=0 hash=419410…ca4a2d td=1048576
INFO [02-04|09:34:01] Loaded most recent local fast block number=913040 hash=9c0570…0f970a td=627371749055334
INFO [02-04|09:34:01] Loaded local transaction journal transactions=0 dropped=0
INFO [02-04|09:34:01] Upgrading chain index type=bloombits percentage=70
INFO [02-04|09:34:01] Regenerated local transaction journal transactions=0 accounts=0
INFO [02-04|09:34:01] Starting P2P networking
INFO [02-04|09:34:05] UDP listener up self=enode://9bbc55ed1cca170be4cba9c3ea76765cca170226dd7e363591d2a6738e55707cb58fa64764c9b1ead28174dbec81ec5721cb2452e625de6292fe36881d672a2@89.233.189.164:30303
INFO [02-04|09:34:05] RLPx listener up self=enode://9bbc55ed1cca170be4cba9c322680d2f956565635956565738e55707cb58fa64764c9b1ead28174dbec81ec5721cb2452e625de6292fe36881d672a2@89.233.189.164:30303
INFO [02-04|09:34:05] IPC endpoint opened: /home/dave/.ethereum/testnet/geth.ipc
INFO [02-04|09:34:05] HTTP endpoint opened: http://127.0.0.1:8545
[dave@localhost go-ethereum]$ du -h /home/dave/.ethereum/
2.8M /home/dave/.ethereum/geth/chaindata
20K /home/dave/.ethereum/geth/nodes
2.9M /home/dave/.ethereum/geth
60M /home/dave/.ethereum/testnet/geth/ethash
2.0G /home/dave/.ethereum/testnet/geth/chaindata
6.2M /home/dave/.ethereum/testnet/geth/nodes
2.0G /home/dave/.ethereum/testnet/geth
8.0K /home/dave/.ethereum/testnet/keystore
2.0G /home/dave/.ethereum/testnet
4.0K /home/dave/.ethereum/keystore
2.0G /home/dave/.ethereum/
Without properly finished transaction you will get following error
java.util.concurrent.ExecutionException: java.lang.RuntimeException: Error processing transaction request: insufficient funds for gas * price + valueRun the test code
mvn exec:java -Dexec.mainClass="org.train.FundsService"Transfer funds using web3j test code
package org.train;
import java.io.IOException;
import java.math.BigDecimal;
import java.util.concurrent.ExecutionException;
import org.web3j.crypto.CipherException;
import org.web3j.crypto.Credentials;
import org.web3j.crypto.WalletUtils;
import org.web3j.protocol.Web3j;
import org.web3j.protocol.core.methods.response.TransactionReceipt;
import org.web3j.protocol.exceptions.TransactionTimeoutException;
import org.web3j.protocol.http.HttpService;
import org.web3j.tx.Transfer;
import org.web3j.utils.Convert;
public class FundsService {
public static void main(String[] args) throws IOException, CipherException, InterruptedException,
ExecutionException, TransactionTimeoutException {
Web3j web3 = Web3j.build(new HttpService());
String walletId = "<WALLET_ADDRESS>";
String walletSource = "/home/dave/.ethereum/testnet/keystore/UTC--2018-02-04T06-34-14.95000000Z--" + walletId + "" +
".json";
Credentials credentials = WalletUtils.loadCredentials("<WALLET_PASSWORD>", walletSource);
String myWalletAddr = "0x" + walletId;
TransactionReceipt transactionReceipt = Transfer.sendFundsAsync(web3, credentials, myWalletAddr,
BigDecimal.valueOf(0.2), Convert.Unit.ETHER).get();
System.out.println("Funds transfer completed...");
System.out.println("Hash: " + transactionReceipt.getBlockHash());
System.out.println("Block number: " + transactionReceipt.getBlockNumber());
}
}
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