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Welcome to ethereumj

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About

EthereumJ is a pure-Java implementation of the Ethereum protocol. For high-level information about Ethereum and its goals, visit ethereum.org. The ethereum white paper provides a complete conceptual overview, and the yellow paper provides a formal definition of the protocol.

We keep EthereumJ as thin as possible. For JSON-RPC support and other client features check Ethereum Harmony.

Running EthereumJ

Adding as a dependency to your Maven project:
   <dependency>
     <groupId>org.ethereum</groupId>
     <artifactId>ethereumj-core</artifactId>
     <version>1.11.0-RELEASE</version>
   </dependency>
or your Gradle project:
   repositories {
       mavenCentral()
       jcenter()
       maven { url "https://dl.bintray.com/ethereum/maven/" }
   }
   implementation "org.ethereum:ethereumj-core:1.9.+"

As a starting point for your own project take a look at https://github.com/ether-camp/ethereumj.starter

Building an executable JAR
git clone https://github.com/ethereum/ethereumj
cd ethereumj
cp ethereumj-core/src/main/resources/ethereumj.conf ethereumj-core/src/main/resources/user.conf
vim ethereumj-core/src/main/resources/user.conf # adjust user.conf to your needs
./gradlew clean fatJar
java -jar ethereumj-core/build/libs/ethereumj-core-*-all.jar
Running from command line:
> git clone https://github.com/ethereum/ethereumj
> cd ethereumj
> ./gradlew run [-PmainClass=<sample class>]
Optional samples to try:
./gradlew run -PmainClass=org.ethereum.samples.BasicSample
./gradlew run -PmainClass=org.ethereum.samples.FollowAccount
./gradlew run -PmainClass=org.ethereum.samples.PendingStateSample
./gradlew run -PmainClass=org.ethereum.samples.PriceFeedSample
./gradlew run -PmainClass=org.ethereum.samples.PrivateMinerSample
./gradlew run -PmainClass=org.ethereum.samples.TestNetSample
./gradlew run -PmainClass=org.ethereum.samples.TransactionBomb
For snapshot builds:

Please, note, snapshots are not stable and are currently in development! If you still want to try it:

Example:

<repository>
    <id>jfrog-snapshots</id>
    <name>oss.jfrog.org</name>
    <url>https://oss.jfrog.org/libs-snapshot/</url>
    <snapshots><enabled>true</enabled></snapshots>
</repository>
<!-- ... -->
<dependency>
   <groupId>org.ethereum</groupId>
   <artifactId>ethereumj-core</artifactId>
   <version>1.11.0-SNAPSHOT</version>
</dependency>
Importing project to IntelliJ IDEA:
> git clone https://github.com/ethereum/ethereumj
> cd ethereumj
> gradlew build

IDEA:

Configuring EthereumJ

For reference on all existing options, their description and defaults you may refer to the default config ethereumj.conf (you may find it in either the library jar or in the source tree ethereum-core/src/main/resources) To override needed options you may use one of the following ways:

Note that don’t need to put all the options to your custom config, just those you want to override.

Special thanks

YourKit for providing us with their nice profiler absolutely for free.

YourKit supports open source projects with its full-featured Java Profiler. YourKit, LLC is the creator of <a href="https://www.yourkit.com/java/profiler/">YourKit Java Profiler</a> and <a href="https://www.yourkit.com/.net/profiler/">YourKit .NET Profiler</a>, innovative and intelligent tools for profiling Java and .NET applications.

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Contact

Chat with us via Gitter

License

ethereumj is released under the LGPL-V3 license.