Upgrade to compatibility with bitcoinj 0.15 about libdohj

[jjos2372]

@jjos2372 is your fork still up to date?

When I want to use a wallet for the dogecoin blockchain, what parts of bitcoinj I need to use and want are the parts of libdohj?
Is it enought to use

NetworkParameters params = DogecoinMainNetParams.get();

and use this params for the wallet and the webkitapi of bitcoinj ?

@Tockra I've been using https://github.com/jjos2372/altcoinj since I published it with no problem, as you said:

NetworkParameters params = DogecoinMainNetParams.get();

Is enough as long as you have the dependencies:

repositories {
	maven { url 'https://jitpack.io' }
}
dependencies {
	compile 'com.github.jjos2372:altcoinj:f26e20bb13'
	compile 'org.bitcoinj:bitcoinj-core:0.15.6'
}

In addition I also have support for LTC on it.

[msgilligan]

Attn: @JeremyRand

[jjos2372]

I just made this fork compatible with bitcoinj 0.15 https://github.com/jjos2372/altcoinj

[Tockra]

@jjos2372 is your fork still up to date?

When I want to use a wallet for the dogecoin blockchain, what parts of bitcoinj I need to use and want are the parts of libdohj?
Is it enought to use

NetworkParameters params = DogecoinMainNetParams.get();

and use this params for the wallet and the webkitapi of bitcoinj ?

[Tockra]

Okay, I hope I did it right.
So I can fully ignore everything else from altcoinj instead of DogecoinMainNetParams.get();.
That sounds easy.

Maybe you can help me further.
I read in a bitcoinj tutorial, that I need to save the wallet multiple times in a file. I don't understand why.

I just want to have a wallet, where I can get the balance and I want to create fresh addresses to which multiple transactions can be sent. Sometimes I want to send balance from that wallet to a other.
When and why I need to write a new version of the wallet to a file?

And what happens if I make wallet transactions (getBalance, sendCoin, ...) before the blockchain is fully synced?

[jjos2372]

You would be actually using all bitcoinj infrastructure, so check their docs. I particularly create a kit:

kit = new WalletAppKit(params, ...)

And them sync the chain before using it:

		kit.startAsync();
		kit.awaitRunning();

You probably should start with DogecoinTestNet3Params.get() first.

[Tockra]

Okay thank you. I will look ^^.
I hope my questions will be answered here : bitcoinj/bitcoinj#2020

[Tockra]

Following code causes into this exception:

[00:25:51 WARN]: [org.bitcoinj.net.ConnectionHandler] Error handling SelectionKey: java.nio.channels.CancelledKeyException
app    | java.nio.channels.CancelledKeyException: null
app    | 	at sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:74) ~[?:?]
app    | 	at sun.nio.ch.SelectionKeyImpl.readyOps(SelectionKeyImpl.java:133) ~[?:?]
app    | 	at java.nio.channels.SelectionKey.isWritable(SelectionKey.java:378) ~[?:?]
app    | 	at org.bitcoinj.net.ConnectionHandler.handleKey(ConnectionHandler.java:244) ~[?:?]
app    | 	at org.bitcoinj.net.NioClientManager.handleKey(NioClientManager.java:86) ~[?:?]
app    | 	at org.bitcoinj.net.NioClientManager.run(NioClientManager.java:122) ~[?:?]
app    | 	at com.google.common.util.concurrent.AbstractExecutionThreadService$1$2.run(AbstractExecutionThreadService.java:66) ~[patched_1.16.1.jar:git-Paper-"0b33230f2"]
app    | 	at com.google.common.util.concurrent.Callables$4.run(Callables.java:122) ~[patched_1.16.1.jar:git-Paper-"0b33230f2"]
app    | 	at org.bitcoinj.utils.ContextPropagatingThreadFactory$1.run(ContextPropagatingThreadFactory.java:51) ~[?:?]
app    | 	at java.lang.Thread.run(Thread.java:832) [?:?]

NetworkParameters params = DogecoinMainNetParams.get();
        this.walletKit = new WalletAppKit(params,new File(config.getWalletPath()),"wallet.dat");
        this.walletKit.setBlockingStartup(true);
        this.walletKit.startAsync();
        this.walletKit.awaitRunning();

[jjos2372]

I use something like this for an existing wallet folder (previously created with bitcoinj randomly, using a seed, etc.):

		kit = new WalletAppKit(params, folderFile, filePrefix) {
			@Override
			protected void onSetupCompleted() {
				log.info("kit setup complete");
			}
		};
		// Download the block chain and wait until it's done.
		kit.startAsync();
		kit.awaitRunning();

Recall that filePrefix is the wallet file name without the .wallet, not sure where are you getting this .dat file.

[Tockra]

I copied it somewhere.
But I still get the java.nio.channels.CancelledKeyException at application start. That isn't cool. Because they spam my console...

[Tockra]

So I did a unsafe workaround. I just filter all Exceptions out of my log, which happens without valid reason:
log4j2.xml:

...
    <Loggers>
        <Root level="info">
            <filters>
                <MarkerFilter marker="NETWORK_PACKETS" onMatch="DENY" onMismatch="NEUTRAL" />
                <RegexFilter regex=".*java.nio.channels.CancelledKeyException.*" onMatch="DENY" onMismatch="NEUTRAL"/>
                <RegexFilter regex=".*Error\swriting\smessage\sto\sconnection,\sclosing\sconnection.*" onMatch="DENY" onMismatch="NEUTRAL"/>
                <RegexFilter regex=".*java.net.SocketException.*" onMatch="DENY" onMismatch="NEUTRAL"/>
                <RegexFilter regex=".*java.net.ConnectException.*" onMatch="DENY" onMismatch="NEUTRAL"/>
                <RegexFilter regex=".*SelectionKey.*java.lang.IllegalStateException.*" onMatch="DENY" onMismatch="NEUTRAL"/>
                <RegexFilter regex=".*Received\sRejectMessage\sbefore\sversion\shandshake\sis\scomplete.*" onMatch="DENY" onMismatch="NEUTRAL"/>
                <RegexFilter regex=".*java.net.NoRouteToHostException.*Host\sis\sunreachable.*" onMatch="DENY" onMismatch="NEUTRAL"/>
            </filters>
        </Root>
    </Loggers>

[rnicoll]

I've finally had some free time, reviews of #44 would be appreciated

[rnicoll]

Oops this was merged a while ago, closing now.