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fixing up maven installation

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17_2_Accessing_Bitcoind_with_Java.md
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# 18.2: Accessing Bitcoind with Java
# 17.2: Accessing Bitcoind with Java
> **NOTE:** This is a draft in progress, so that I can get some feedback from early reviewers. It is not yet ready for learning.
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.
This section explains how to interact with `bitcoind` using the Java programming language and the [JavaBitcoindRpcClient](https://github.com/Polve/JavaBitcoindRpcClient).
## Setting Up Java
## 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. In this project we will create a maven project and indicate minimum configuration about Gradle (https://gradle.org/releases/)
You can install Java on your server, using the `apt-get` command. You will also install [Apache Maven](http://maven.apache.org/) to manage the dependencies.
```
$ apt-get install openjdk-11-jre-headless maven
$ sudo apt-get install openjdk-11-jre-headless maven
```
You can verify your Java installation:
```
$ java -version
openjdk version "11.0.7" 2020-04-14
OpenJDK Runtime Environment (build 11.0.7+10-post-Ubuntu-2ubuntu218.04)
OpenJDK 64-Bit Server VM (build 11.0.7+10-post-Ubuntu-2ubuntu218.04, mixed mode, sharing)
openjdk version "11.0.8" 2020-07-14
OpenJDK Runtime Environment (build 11.0.8+10-post-Debian-1deb10u1)
OpenJDK 64-Bit Server VM (build 11.0.8+10-post-Debian-1deb10u1, mixed mode, sharing)
```
## Create maven project
### Creating a Maven Project
In order to prepare for Bitcoin on java, you will create a Maven project:
```
mvn archetype:generate -DgroupId=com.blockchaincommons.lbtc -DartifactId=java-project -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false
$ mvn archetype:generate -DgroupId=com.blockchaincommons.lbtc -DartifactId=java-project -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false
```
It will download some dependencies
This will download some dependencies
```
Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-clean-plugin/2.5/maven-clean-plugin-2.5.pom
Downloaded: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-clean-plugin/2.5/maven-clean-plugin-2.5.pom (4 KB at 4.2 KB/sec)
@ -38,41 +36,41 @@ Downloaded: https://repo.maven.apache.org/maven2/org/apache/maven/maven-parent/2
Downloading: https://repo.maven.apache.org/maven2/org/apache/apache/10/apache-10.pom
..............
```
It will create a configuration file pom.xml
It will also create a configuration file `pom.xml`:
```
user@machine:~/BitcoinRpcClient/java-project$ ll
total 16
drwxr-xr-x 3 user user 4096 Jun 17 16:47 ./
drwxr-xr-x 3 user user 4096 Jun 17 15:02 ../
-rw-r--r-- 1 user user 1175 Jun 17 16:34 pom.xml
drwxr-xr-x 4 user user 4096 Jun 17 15:02 src/
user@machine:~/BitcoinRpcClient/java-project$
$ cd java-project
$ ls -lagh
total 16K
drwxr-xr-x 3 sudo 4.0K Sep 1 13:58 .
drwxr-xr-x 15 sudo 4.0K Sep 1 13:58 ..
-rw-r--r-- 1 sudo 663 Sep 1 13:58 pom.xml
drwxr-xr-x 4 sudo 4.0K Sep 1 13:58 src
```
This project uses JavaBitcoindRpcClient, so you need include the dependency editing pom.xml file
In order to include `JavaBitcoindRpcClient`, you must add that dependency to `<dependendencies>` in the `pom.xml` file
```xml
<dependency>
<groupId>wf.bitcoin</groupId>
<artifactId>JavaBitcoindRpcClient</artifactId>
<version>1.1.0</version>
</dependency>
<dependency>
<groupId>wf.bitcoin</groupId>
<artifactId>bitcoin-rpc-client</artifactId>
<version>1.1.0</version>
</dependency>
```
You need to add compiler properties to indicate what JDK version will compile the source code.
```
<properties>
<!-- https://maven.apache.org/general.html#encoding-warning -->
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.11</maven.compiler.source>
<maven.compiler.target>1.11</maven.compiler.target>
</properties>
<properties>
<!-- https://maven.apache.org/general.html#encoding-warning -->
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
</properties>
```
Finally add source code to java classes and execute
```
user@machine:~/BitcoinRpcClient/java-project$ mvn package
$ mvn package
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------< com.blockchaincommons.lbtc:java-project >-------------------
@ -101,12 +99,15 @@ Tests run: 2, Failures: 0, Errors: 0, Skipped: 0
[INFO] ------------------------------------------------------------------------```
```
Or if you use Gradle:
### Creating Alternative Projects
If you use [Gradle]((https://gradle.org/releases/), you can instead run:
```groovy
compile 'wf.bitcoin:JavaBitcoindRpcClient:1.1.0'
```
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/).
If you want a sample project and some instructions on how to run it on the server that you just created, you can refer to the [Bitcoind Java Sample Project](https://github.com/brunocvcunha/bitcoind-java-client-sample/).
## Build Your Connection