Day #4 of the SteemJ Dev Diary was mainly focused on the MarketHistoryAPI rework and a knowledge transfer with 
Latest SteemJ 0.4.x releases: 0.4.3 v0.4.2 v0.4.2pr1 v0.4.1 v0.4.0
SteemJ Dev Diary #4 (04.01.2018) - The DatabaseApi
Hello Steemians and welcome back to day #4 of the SteemJ HF 0.20 Dev Diary!
This series has been introduced to collect feedback from you and to motivate myself to finalize the next SteemJ version as soon as possible. If this is the first part of this series you read, you may want to checkout Day #1 which explains the motivation behind this diary in detail and also provides a first overview of the API changes that come with HF 0.20.
Changes during day #4
The last 2 days have been quite frustrating, because I can't test the changes properly as a Steem Node running HF 0.19.2 is serving the API Endpoint behind https://api.steemitdev.com. As there are only three days left for this diary and the target was to finish as much as possible, I tried to make good use of the time.
After yesterdays rework of the MarketHistoryAPI I had a look at the DatabaseApi today (Tracked in Issue #75.
In commit 362af1 all changes can be seen. I basically moved methods from the 'SteemJ' class into a separate 'DatabaseApi' class, added new methods like 'listWitnesses' and 'findWitnesses' and, in addition, created the '_args' and '_return' for the different methods.
The package structure itself becomes quite clean now:
But there is still a lot to do.
The most important thing for me right now is the possibility to test the parts that have already been changed. Together with
This node should help us a lot :)
A list of all commits made after the last release can be found here: https://github.com/marvin-we/steem-java-api-wrapper/compare/v0.4.3...master
(A prove that the commits have been made by me can be found here)
General information
What is SteemJ?
SteemJ is a project that allows you to communicate with a Steem node using Java. So far, the project supports most of the API calls and is also able to broadcast most of the common operation types. Further information can be found on GitHub.
Quick Start Guide
Add SteemJ to your project
SteemJ binaries are pushed into the maven central repository and can be integrated with a bunch of build management tools like Maven. The Wiki provides a lot of examples for the most common build tools. If you do not use a build management tool you can download the binaries as described here.
To add this release to your project paste the following snippet into your 'pom.xml'
<dependency>
<groupId>eu.bittrade.libs</groupId>
<artifactId>steemj-core</artifactId>
<version>0.4.3</version>
</dependency>
Start posting
SteemJConfig myConfig = SteemJConfig.getInstance();
myConfig.setDefaultAccount(new AccountName("YOUR-ACCOUNT"));
List<ImmutablePair<PrivateKeyType, String>> privateKeys = new ArrayList<>();
privateKeys.add(new ImmutablePair<>(PrivateKeyType.POSTING, "YOUR-PRIVATE-POSTING-KEY"));
myConfig.getPrivateKeyStorage().addAccount(myConfig.getDefaultAccount(), privateKeys);
steemJ.createComment(new AccountName("steemj"), new Permlink("testofsteemj040"), "Example comment without no link but with a @user .", new String[] { "test" });
Further information
The sample module of the SteemJ project provides showcases for the most common acitivies and operations users want to perform.
Beside that you can find a lot of snippets and examples in the different Wiki sections.
Contribute
The project became quite big and there is still a lot to do. If you want to support the project simply clone the git repository and submit a pull request. I would really appreciate it =).
git clone https://github.com/marvin-we/steem-java-api-wrapper.git
Get in touch!
Most of my projects are pretty time consuming and I always try to provide some useful stuff to the community. What keeps me going for that is your feedback and your support. For that reason I would love to get some Feedback from you <3. Just contact me here on Steemit or ping me on GitHub.
Posted on Utopian.io - Rewarding Open Source Contributors