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besu/CHANGELOG.md

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# Changelog
## Upcoming Changes in v0.9
### Breaking Changes to Command Line
In v0.9, changes will be made to the command line options to improve usability. These will be breaking changes; that is,
in many cases the v0.8 command line options will no longer work. The
[Pantheon documentation](https://docs.pantheon.pegasys.tech/en/latest/Reference/Pantheon-CLI-Syntax/) will be
updated to reflect these changes. Any further information required about the changes will be included in the v0.9 release notes.
### Private Network Quickstart
In v0.9, the Private Network Quickstart will be moved to a separate repository and the existing Private Network
Quickstart removed from the Pantheon repository. The [Private Network Quickstart tutorial](https://docs.pantheon.pegasys.tech/en/latest/Getting-Started/Private-Network-Quickstart/)
will be updated and use the Private Network Quickstart in the separate repository.
## 0.8.5
Indefinitely delays the roll-out of Constantinople on Ethereum Mainnet due to a [potential security issue](https://blog.ethereum.org/2019/01/15/security-alert-ethereum-constantinople-postponement/) detected.
## Additions and Improvements
- Remove Constantinople fork block [\#574](https://github.com/PegaSysEng/pantheon/pull/574)
## Technical Improvements
- Rename IBFT message packages [\#568](https://github.com/PegaSysEng/pantheon/pull/568)
## 0.8.4
### Docker Image
If you have been running a node using the v0.8.3 Docker image, the node was not saving data to the
specified [data directory](https://docs.pantheon.pegasys.tech/en/latest/Getting-Started/Run-Docker-Image/#data-directory),
or referring to the custom [configuration file](https://docs.pantheon.pegasys.tech/en/latest/Getting-Started/Run-Docker-Image/#custom-configuration-file)
or [genesis file](https://docs.pantheon.pegasys.tech/en/latest/Getting-Started/Run-Docker-Image/#custom-genesis-file).
To recover the node key and data directory from the Docker container:
`docker cp <container>:/opt/pantheon/key <destination_file>`
`docker cp <container>:/opt/pantheon/database <destination_directory>`
Where `container` is the name or ID of the Docker container containing the Pantheon node.
The container can be running or stopped when you copy the key and data directory. If your node was
fully synchronized to MainNet, the data directory will be ~2TB.
When restarting your node with the v0.8.4 Docker image:
* Save the node key in the [`key` file](https://docs.pantheon.pegasys.tech/en/latest/Configuring-Pantheon/Node-Keys/#node-private-key) in the data
directory or specify the location using the [`--node-private-key` option](https://docs.pantheon.pegasys.tech/en/latest/Configuring-Pantheon/Node-Keys/#specifying-a-custom-node-private-key-file).
* Specify the `<destination_directory` as a [volume for the data directory](https://docs.pantheon.pegasys.tech/en/latest/Getting-Started/Run-Docker-Image/#data-directory).
### Bug Fixes
- Fixing default resource locations inside docker [\#529](https://github.com/PegaSysEng/pantheon/pull/529)
- NewRoundMessageValidator ignores Round Number when comparing blocks [\#523](https://github.com/PegaSysEng/pantheon/pull/523)
- Fix Array Configurable command line options [\#514](https://github.com/PegaSysEng/pantheon/pull/514)
## Additions and Improvements
- RocksDB Metrics [\#531](https://github.com/PegaSysEng/pantheon/pull/531)
- Added `ibft_getValidatorsByBlockHash` JSON RPC [\#519](https://github.com/PegaSysEng/pantheon/pull/519)
- Expose metrics to Prometheus [\#506](https://github.com/PegaSysEng/pantheon/pull/506)
- Added `ibft_getValidatorsByBlockNumber` [\#499](https://github.com/PegaSysEng/pantheon/pull/499)
- Added `Roadmap.md` file. [\#494](https://github.com/PegaSysEng/pantheon/pull/494)
- Added JSON RPC `eth hashrate` method. [\#488](https://github.com/PegaSysEng/pantheon/pull/488)
- Account whitelist API [\#487](https://github.com/PegaSysEng/pantheon/pull/487)
- Added nodes whitelist JSON-RPC APIs [\#476](https://github.com/PegaSysEng/pantheon/pull/476)
- Added account whitelisting [\#460](https://github.com/PegaSysEng/pantheon/pull/460)
- Added configurable refresh delay for SyncingSubscriptionService on start up [\#383](https://github.com/PegaSysEng/pantheon/pull/383)
- Added the Command Line Style Guide [\#530](https://github.com/PegaSysEng/pantheon/pull/530)
- Documentation updates include:
* Migrated to new [documentation site](https://docs.pantheon.pegasys.tech/en/latest/)
* Added [configuration file content](https://docs.pantheon.pegasys.tech/en/latest/Configuring-Pantheon/Using-Configuration-File/)
* Added [tutorial to create private network](https://docs.pantheon.pegasys.tech/en/latest/Tutorials/Create-Private-Network/)
* Added content on [enabling non-default APIs](https://docs.pantheon.pegasys.tech/en/latest/Reference/JSON-RPC-API-Methods/)
## Technical Improvements
- Updated `--bootnodes` command option to take zero arguments [\#548](https://github.com/PegaSysEng/pantheon/pull/548)
- IBFT Integration Testing - Local Node is proposer [\#527](https://github.com/PegaSysEng/pantheon/pull/527)
- Remove vertx from discovery tests [\#539](https://github.com/PegaSysEng/pantheon/pull/539)
- IBFT Integration testing - Round Change [\#537](https://github.com/PegaSysEng/pantheon/pull/537)
- NewRoundMessageValidator creates RoundChangeValidator with correct value [\#518](https://github.com/PegaSysEng/pantheon/pull/518)
- Remove time dependency from BlockTimer tests [\#513](https://github.com/PegaSysEng/pantheon/pull/513)
- Gradle 5.1 [\#512](https://github.com/PegaSysEng/pantheon/pull/512)
- Metrics measurement adjustment [\#511](https://github.com/PegaSysEng/pantheon/pull/511)
- Metrics export for import command. [\#509](https://github.com/PegaSysEng/pantheon/pull/509)
- IBFT Integration test framework [\#502](https://github.com/PegaSysEng/pantheon/pull/502)
- IBFT message gossiping [\#501](https://github.com/PegaSysEng/pantheon/pull/501)
- Remove non-transactional mutation from KeyValueStore [\#500](https://github.com/PegaSysEng/pantheon/pull/500)
- Ensured that the blockchain queries class handles optionals better. [\#486](https://github.com/PegaSysEng/pantheon/pull/486)
- IBFT mining acceptance test [\#483](https://github.com/PegaSysEng/pantheon/pull/483)
- Set base directory name to be lowercase in building.md [\#474](https://github.com/PegaSysEng/pantheon/pull/474) (Thanks to [Matthalp](https://github.com/Matthalp))
- Moved admin\_peers to Admin API group [\#473](https://github.com/PegaSysEng/pantheon/pull/473)
- Nodes whitelist acceptance test [\#472](https://github.com/PegaSysEng/pantheon/pull/472)
- Rework RoundChangeManagerTest to not reuse validators [\#469](https://github.com/PegaSysEng/pantheon/pull/469)
- Ignore node files to support truffle. [\#467](https://github.com/PegaSysEng/pantheon/pull/467)
- IBFT pantheon controller [\#461](https://github.com/PegaSysEng/pantheon/pull/461)
- IBFT Round to update internal state on reception of NewRound Message [\#451](https://github.com/PegaSysEng/pantheon/pull/451)
- Update RoundChangeManager correctly create its message validator [\#450](https://github.com/PegaSysEng/pantheon/pull/450)
- Use seconds for block timer time unit [\#445](https://github.com/PegaSysEng/pantheon/pull/445)
- IBFT controller and future msgs handling [\#431](https://github.com/PegaSysEng/pantheon/pull/431)
- Allow IBFT Round to be created using PreparedCert [\#429](https://github.com/PegaSysEng/pantheon/pull/429)
- Added MessageValidatorFactory [\#425](https://github.com/PegaSysEng/pantheon/pull/425)
- Inround payload [\#423](https://github.com/PegaSysEng/pantheon/pull/423)
- Updated IbftConfig Fields [\#422](https://github.com/PegaSysEng/pantheon/pull/422)
- Repair IbftBlockCreator and add tests [\#421](https://github.com/PegaSysEng/pantheon/pull/421)
- Make Pantheon behave as a submodule [\#419](https://github.com/PegaSysEng/pantheon/pull/419)
- Ibft Height Manager [\#418](https://github.com/PegaSysEng/pantheon/pull/418)
- Ensure bootnodes are a subset of node whitelist [\#414](https://github.com/PegaSysEng/pantheon/pull/414)
- IBFT Consensus Round Classes [\#405](https://github.com/PegaSysEng/pantheon/pull/405)
- IBFT message payload tests [\#404](https://github.com/PegaSysEng/pantheon/pull/404)
- Validate enodeurl syntax from command line [\#403](https://github.com/PegaSysEng/pantheon/pull/403)
- Update errorprone [\#401](https://github.com/PegaSysEng/pantheon/pull/401)
- IBFT round change manager [\#393](https://github.com/PegaSysEng/pantheon/pull/393)
- IBFT RoundState [\#392](https://github.com/PegaSysEng/pantheon/pull/392)
- Move Block data generator test helper to test support package [\#391](https://github.com/PegaSysEng/pantheon/pull/391)
- IBFT message tests [\#367](https://github.com/PegaSysEng/pantheon/pull/367)
## 0.8.3
### Breaking Change to JSON RPC-API
From v0.8.3, incoming HTTP requests are only accepted from hostnames specified using the `--host-whitelist` command-line option. If not specified, the default value for `--host-whitelist` is `localhost`.
If using the URL `http://127.0.0.1` to make JSON-RPC calls, use `--host-whitelist` to specify the hostname `127.0.0.1` or update the hostname to `localhost`.
If your application publishes RPC ports, specify the hostnames when starting Pantheon. For example:
```json
pantheon --host-whitelist=example.com
```
Specify `*` or `all` for `--host-whitelist` to effectively disable host protection and replicate pre-v0.8.3 behavior. This is not recommended for production code.
### Bug Fixes
- Repair Clique Proposer Selection [\#339](https://github.com/PegaSysEng/pantheon/pull/339)
- High TX volume swamps block processing [\#337](https://github.com/PegaSysEng/pantheon/pull/337)
- Check if the connectFuture has completed successfully [\#293](https://github.com/PegaSysEng/pantheon/pull/293)
- Switch back to Xerial Snappy Library [\#284](https://github.com/PegaSysEng/pantheon/pull/284)
- ShortHex of 0 should be '0x0', not '0x' [\#272](https://github.com/PegaSysEng/pantheon/pull/272)
- Fix pantheon CLI default values infinite loop [\#266](https://github.com/PegaSysEng/pantheon/pull/266)
### Additions and Improvements
- Added `--nodes-whitelist` parameter to CLI and NodeWhitelistController [\#346](https://github.com/PegaSysEng/pantheon/pull/346)
- Discovery wiring for `--node-whitelist` [\#365](https://github.com/PegaSysEng/pantheon/pull/365)
- Plumb in three more metrics [\#344](https://github.com/PegaSysEng/pantheon/pull/344)
- `ProposerSelection` to support multiple IBFT implementations [\#307](https://github.com/PegaSysEng/pantheon/pull/307)
- Configuration to support IBFT original and revised [\#306](https://github.com/PegaSysEng/pantheon/pull/306)
- Added host whitelist for JSON-RPC. [**Breaking Change**](#breaking-change-to-json-rpc-api) [\#295](https://github.com/PegaSysEng/pantheon/pull/295)
- Reduce `Block creation processed cancelled` log message to debug [\#294](https://github.com/PegaSysEng/pantheon/pull/294)
- Implement iterative peer search [\#268](https://github.com/PegaSysEng/pantheon/pull/268)
- Added RLP enc/dec for PrePrepare, Commit and NewRound messages [\#200](https://github.com/PegaSysEng/pantheon/pull/200)
- IBFT block mining [\#169](https://github.com/PegaSysEng/pantheon/pull/169)
- Added `--goerli` CLI option [\#370](https://github.com/PegaSysEng/pantheon/pull/370) (Thanks to [@Nashatyrev](https://github.com/Nashatyrev))
- Begin capturing metrics to better understand Pantheon's behaviour [\#326](https://github.com/PegaSysEng/pantheon/pull/326)
- Documentation updates include:
* Added Coding Conventions [\#342](https://github.com/PegaSysEng/pantheon/pull/342)
* Reorganised [Installation documentation](https://github.com/PegaSysEng/pantheon/wiki/Installation) and added [Chocolatey installation](https://github.com/PegaSysEng/pantheon/wiki/Install-Binaries#windows-with-chocolatey) for Windows
* Reorganised [JSON-RPC API documentation](https://github.com/PegaSysEng/pantheon/wiki/JSON-RPC-API)
* Updated [RPC Pub/Sub API documentation](https://github.com/PegaSysEng/pantheon/wiki/RPC-PubSub)
### Technical Improvements
- Extracted non-Docker CLI parameters to picoCLI mixin. [\#323](https://github.com/PegaSysEng/pantheon/pull/323)
- IBFT preprepare to validate round matches block [\#329](https://github.com/PegaSysEng/pantheon/pull/329)
- Fix acceptance test [\#324](https://github.com/PegaSysEng/pantheon/pull/324)
- Added the `IbftFinalState` [\#385](https://github.com/PegaSysEng/pantheon/pull/385)
- Constantinople Fork Block [\#382](https://github.com/PegaSysEng/pantheon/pull/382)
- Fix `pantheon.cli.PantheonCommandTest` test on Windows [\#380](https://github.com/PegaSysEng/pantheon/pull/380)
- JDK smoke testing is being configured differently now [\#374](https://github.com/PegaSysEng/pantheon/pull/374)
- Re-enable clique AT [\#373](https://github.com/PegaSysEng/pantheon/pull/373)
- Ignoring acceptance test [\#372](https://github.com/PegaSysEng/pantheon/pull/372)
- Changes to support Gradle 5.0 [\#371](https://github.com/PegaSysEng/pantheon/pull/371)
- Clique: Prevent out of turn blocks interrupt in-turn mining [\#364](https://github.com/PegaSysEng/pantheon/pull/364)
- Time all tasks [\#361](https://github.com/PegaSysEng/pantheon/pull/361)
- Rework `VoteTallyCache` to better represent purpose [\#360](https://github.com/PegaSysEng/pantheon/pull/360)
- Add an `UNKNOWN` `DisconnectReason` [\#359](https://github.com/PegaSysEng/pantheon/pull/359)
- New round validation [\#353](https://github.com/PegaSysEng/pantheon/pull/353)
- Update get validators for block hash test to start from block 1 [\#352](https://github.com/PegaSysEng/pantheon/pull/352)
- Idiomatic Builder Pattern [\#345](https://github.com/PegaSysEng/pantheon/pull/345)
- Revert `Repair Clique Proposer Selection` \#339 - Breaks Görli testnet [\#343](https://github.com/PegaSysEng/pantheon/pull/343)
- No fixed ports in tests [\#340](https://github.com/PegaSysEng/pantheon/pull/340)
- Update clique acceptance test genesis file to use correct clique property names [\#338](https://github.com/PegaSysEng/pantheon/pull/338)
- Supporting list of addresses in logs subscription [\#336](https://github.com/PegaSysEng/pantheon/pull/336)
- Render handler exception to `System.err` instead of `.out` [\#334](https://github.com/PegaSysEng/pantheon/pull/334)
- Renamed IBFT message classes [\#333](https://github.com/PegaSysEng/pantheon/pull/333)
- Add additional RLP tests [\#332](https://github.com/PegaSysEng/pantheon/pull/332)
- Downgrading spotless to 3.13.0 to fix threading issues [\#325](https://github.com/PegaSysEng/pantheon/pull/325)
- `eth_getTransactionReceipt` acceptance test [\#322](https://github.com/PegaSysEng/pantheon/pull/322)
- Upgrade vertx to 3.5.4 [\#316](https://github.com/PegaSysEng/pantheon/pull/316)
- Round change validation [\#315](https://github.com/PegaSysEng/pantheon/pull/315)
- Basic IBFT message validators [\#314](https://github.com/PegaSysEng/pantheon/pull/314)
- Minor repairs to clique block scheduling [\#308](https://github.com/PegaSysEng/pantheon/pull/308)
- Dependencies Version upgrade [\#303](https://github.com/PegaSysEng/pantheon/pull/303)
- Build multiple JVM [\#301](https://github.com/PegaSysEng/pantheon/pull/301)
- Smart contract acceptance test [\#296](https://github.com/PegaSysEng/pantheon/pull/296)
- Fixing WebSocket error response [\#292](https://github.com/PegaSysEng/pantheon/pull/292)
- Reword error messages following exceptions during mining [\#291](https://github.com/PegaSysEng/pantheon/pull/291)
- Clique acceptance tests [\#290](https://github.com/PegaSysEng/pantheon/pull/290)
- Delegate creation of additional JSON-RPC methods to the PantheonController [\#289](https://github.com/PegaSysEng/pantheon/pull/289)
- Remove unnecessary `RlpInput` and `RlpOutput` classes [\#287](https://github.com/PegaSysEng/pantheon/pull/287)
- Remove `RlpUtils` [\#285](https://github.com/PegaSysEng/pantheon/pull/285)
- Enabling previously ignored acceptance tests [\#282](https://github.com/PegaSysEng/pantheon/pull/282)
- IPv6 peers [\#281](https://github.com/PegaSysEng/pantheon/pull/281)
- IPv6 Bootnode [\#280](https://github.com/PegaSysEng/pantheon/pull/280)
- Acceptance test for `getTransactionReceipt` JSON-RPC method [\#278](https://github.com/PegaSysEng/pantheon/pull/278)
- Inject `StorageProvider` into `PantheonController` instances [\#259](https://github.com/PegaSysEng/pantheon/pull/259)
## 0.8.2
### Removed
- Removed `import-blockchain` command because nothing exports to the required format yet (PR [\#223](https://github.com/PegaSysEng/pantheon/pull/223))
### Bug Fixes
- `io.netty.util.internal.OutOfDirectMemoryError` errors by removing reference counting from network messages.
- Log spam: endless loop in `nioEventLoopGroup` ([#248](https://github.com/PegaSysEng/pantheon/issues/248) thanks to [@5chdn](https://github.com/5chdn) for reporting) (PR [#261](https://github.com/PegaSysEng/pantheon/pull/261))
- Rinkeby import can stall with too many fragments ([#228](https://github.com/PegaSysEng/pantheon/issues/228) thanks to [@steffenkux](https://github.com/steffenkux) and [@5chdn](https://github.com/5chdn) for reporting) (PR [#255](https://github.com/PegaSysEng/pantheon/pull/255))
- Clique incorrectly used the chain ID instead of the network ID in ETH status messages (PR [#209](https://github.com/PegaSysEng/pantheon/pull/209))
- Gradle deprecation warnings (PR [#246](https://github.com/PegaSysEng/pantheon/pull/246) with thanks to [@jvirtanen](https://github.com/jvirtanen))
- Consensus issue on Ropsten:
- Treat output length as a maximum length for CALL operations (PR [#236](https://github.com/PegaSysEng/pantheon/pull/236))
- ECRec precompile should return empty instead of 32 zero bytes when the input is invalid (PR [#227](https://github.com/PegaSysEng/pantheon/pull/227))
- File name too long error while building from source ([#215](https://github.com/PegaSysEng/pantheon/issues/215) thanks to [@5chdn](https://github.com/5chdn) for reporting) (PR [#221](https://github.com/PegaSysEng/pantheon/pull/221))
- Loop syntax in `runPantheonPrivateNetwork.sh` (PR [#237](https://github.com/PegaSysEng/pantheon/pull/237) thanks to [@matt9ucci](https://github.com/matt9ucci))
- Fix `CompressionException: Snappy decompression failed` errors ([#251](https://github.com/PegaSysEng/pantheon/issues/251) thanks to [@5chdn](https://github.com/5chdn) for reporting) (PR [#274](https://github.com/PegaSysEng/pantheon/pull/274))
### Additions and Improvements
- Added `--ropsten` command line argument to make syncing to Ropsten easier ([#186](https://github.com/PegaSysEng/pantheon/issues/186)) (PR [#197](https://github.com/PegaSysEng/pantheon/pull/197) with thanks to [@jvirtanen](https://github.com/jvirtanen))
- Enabled constantinople in `--dev-mode` (PR [#256](https://github.com/PegaSysEng/pantheon/pull/256))
- Supported Constantinople with Clique ([#245](https://github.com/PegaSysEng/pantheon/issues/245) thanks to [@5chdn](https://github.com/5chdn) for reporting) (PR [#250](https://github.com/PegaSysEng/pantheon/pull/250), PR [#247](https://github.com/PegaSysEng/pantheon/pull/247))
- Implemented `eth_chainId` JSON-RPC method ([#206](https://github.com/PegaSysEng/pantheon/issues/206)) (PR [#219](https://github.com/PegaSysEng/pantheon/pull/219))
- Updated client version to be ethstats friendly (PR [#258](https://github.com/PegaSysEng/pantheon/pull/258))
- Added `--node-private-key` option to allow nodekey file to be specified separately to data directory ([#233](https://github.com/PegaSysEng/pantheon/issues/233) thanks to [@peterbroadhurst](https://github.com/peterbroadhurst) for requesting) (PR [#234](https://github.com/PegaSysEng/pantheon/pull/234))
- Added `--banned-nodeids` option to prevent connection to specific nodes (PR [#254](https://github.com/PegaSysEng/pantheon/pull/254))
- Send client quitting disconnect message to peers on shutdown ([#184](https://github.com/PegaSysEng/pantheon/issues/184)) (PR [#253](https://github.com/PegaSysEng/pantheon/pull/253))
- Improved error message for port conflict error (PR [#232](https://github.com/PegaSysEng/pantheon/pull/232))
- Improved documentation by adding the following pages:
* [Getting Started](https://github.com/PegaSysEng/pantheon/wiki/Getting-Started)
* [Network ID and Chain ID](https://github.com/PegaSysEng/pantheon/wiki/NetworkID-And-ChainID)
* [Node Keys](https://github.com/PegaSysEng/pantheon/wiki/Node-Keys)
* [Networking](https://github.com/PegaSysEng/pantheon/wiki/Networking)
* [Accounts for Testing](https://github.com/PegaSysEng/pantheon/wiki/Accounts-for-Testing)
* [Logging](https://github.com/PegaSysEng/pantheon/wiki/Logging)
* [Proof of Authority](https://github.com/PegaSysEng/pantheon/wiki/Proof-of-Authority)
* [Passing JVM Options](https://github.com/PegaSysEng/pantheon/wiki/Passing-JVM-Options)
### Technical Improvements
- Upgraded Ethereum reference tests to 6.0 beta 2. (thanks to [@jvirtanen](https://github.com/jvirtanen) for the initial upgrade to beta 1)
- Set Java compiler default encoding to UTF-8 (PR [#238](https://github.com/PegaSysEng/pantheon/pull/238) thanks to [@matt9ucci](https://github.com/matt9ucci))
- Removed duplicate code defining default JSON-RPC APIs (PR [#218](https://github.com/PegaSysEng/pantheon/pull/218) thanks to [@matt9ucci](https://github.com/matt9ucci))
- Improved code for parsing config (PRs [#208](https://github.com/PegaSysEng/pantheon/pull/208), [#209](https://github.com/PegaSysEng/pantheon/pull/209))
- Use `java.time.Clock` in favour of a custom Clock interface (PR [#220](https://github.com/PegaSysEng/pantheon/pull/220))
- Improve modularity of storage systems (PR [#211](https://github.com/PegaSysEng/pantheon/pull/211), [#207](https://github.com/PegaSysEng/pantheon/pull/207))
- Treat JavaDoc warnings as errors (PR [#171](https://github.com/PegaSysEng/pantheon/pull/171))
- Add benchmark for `BlockHashOperation `as a template for benchmarking other EVM operations (PR [#203](https://github.com/PegaSysEng/pantheon/pull/203))
- Added unit tests for `EthBlockNumber` ([#189](https://github.com/PegaSysEng/pantheon/issues/189)) (PR [#195](https://github.com/PegaSysEng/pantheon/pull/195) thanks to [@jvirtanen](https://github.com/jvirtanen))
- Code style improvements (PR [#196](https://github.com/PegaSysEng/pantheon/pull/196) thanks to [@jvirtanen](https://github.com/jvirtanen))
- Added unit tests for `Web3ClientVersion` ([#191](https://github.com/PegaSysEng/pantheon/issues/191)) (PR [#194](https://github.com/PegaSysEng/pantheon/pull/194) with thanks to [@jvirtanen](https://github.com/jvirtanen))
- Removed RLPUtils from `RawBlockIterator` (PR [#179](https://github.com/PegaSysEng/pantheon/pull/179))
- Replace the JNI based snappy library with a pure-Java version (PR [#257](https://github.com/PegaSysEng/pantheon/pull/257))