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add Java installation details and reference to sample project

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Bruno Volpato 2017-12-27 10:30:25 -08:00
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12_7_Accessing_Bitcoind_with_Java.md
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Interacting with the `bitcoind` directly and using command-line `curl` can get simple if you understand how it works, but there's a project [JavaBitcoindRpcClient](https://github.com/Polve/JavaBitcoindRpcClient) that provides the functionality in a Java-API level, making it even easier to interact with your Bitcoin Server. Interacting with the `bitcoind` directly and using command-line `curl` can get simple if you understand how it works, but there's a project [JavaBitcoindRpcClient](https://github.com/Polve/JavaBitcoindRpcClient) that provides the functionality in a Java-API level, making it even easier to interact with your Bitcoin Server.
## Setup Java
To install Java on the VPS Server, you are able to use the `apt-get` command. We will also use [Apache Maven](http://maven.apache.org/) to manage the dependencies, so we will install it together.
```
$ apt-get install openjdk-9-jre-headless maven
```
You can verify your Java installation:
```
$ java -version
openjdk version "9-internal"
OpenJDK Runtime Environment (build 9-internal+0-2016-04-14-195246.buildd.src)
OpenJDK 64-Bit Server VM (build 9-internal+0-2016-04-14-195246.buildd.src, mixed mode)
```
## Setup Dependency ## Setup Dependency
If you use Maven in your Java project, you can include the dependency: If you use Maven in your Java project, you can include the dependency:
@ -20,6 +37,8 @@ Or if you use Gradle:
compile 'wf.bitcoin:JavaBitcoindRpcClient:0.9.13' compile 'wf.bitcoin:JavaBitcoindRpcClient:0.9.13'
``` ```
If you want a sample project and some instructions on how to run it on the server that we just created, you can refer to the [Bitcoind Java Sample Project](https://github.com/brunocvcunha/bitcoind-java-client-sample/).
### Build Your Connection ### Build Your Connection
To use `JavaBitcoindRpcClient`, you need to create a `BitcoindRpcClient` instance. The arguments in the URL are username, password, IP address and port. You should know this information from your work with `curl` . As you'll recall, the IP address 127.0.0.1 and port 18332 should be correct for the standard testnet setup described in this documents, while you can extract the user and password from `~/.bitcoin/bitcoin.conf`. To use `JavaBitcoindRpcClient`, you need to create a `BitcoindRpcClient` instance. The arguments in the URL are username, password, IP address and port. You should know this information from your work with `curl` . As you'll recall, the IP address 127.0.0.1 and port 18332 should be correct for the standard testnet setup described in this documents, while you can extract the user and password from `~/.bitcoin/bitcoin.conf`.