Due to the sunset of Bintray & jcenter(refer to Into the Sunset on May 1st: Bintray, JCenter, GoCenter, and ChartCenter), the reference of jcenter should be replaced by mavenCentral.

For security reasons, we will no longer perform packaging and uploading to maven. Please clone and package from GitHub.


trident-java is a lightweight SDK that includes libraries for working with TRON system contracts and smart contracts.

trident-java makes it easy to build TRON applications with java.

Install trident-Java

To start using trident-java, firstly you will add the packages as your dependencies.

After cloning the code from GitHub, you need to compile the code first.

Please use java version 1.8.0_231 and Gradle 5.6.4 to compile and package.

trident-java has set compatibility for jdk8 and can be used as a dependency. You can also add compatibility settings before compiling, located in trident-java/build.gradle, 'subject' item:

java {
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8
        // Add any compatibility 

Repository settings


About third-party dependencies

Please add third-party libraries that trident uses to your own project.

Add Bintray to Gradle repositories:

repositories {

Choose required packages

trident-java includes three packages:

abiThis contains datatypes and ABI encoders/decoders.
coreThis contains the wrapping functions for easily interacting with TRON system and smart contracts.
utilsThis contains tools including encryption, conversion, Etc.

Gradle dependencies

trident-java interacts with the TRON network through GRPC, Protobuf & GRPC related packages are required.

dependencies {
    // protobuf & grpc
    implementation 'com.google.protobuf:protobuf-java:3.11.0'
    implementation 'io.grpc:grpc-netty-shaded:1.31.0'
    implementation 'io.grpc:grpc-netty:1.31.0'
    implementation 'io.grpc:grpc-protobuf:1.31.0'
    implementation 'io.grpc:grpc-stub:1.31.0'
    implementation "org.bouncycastle:bcprov-jdk15on:1.68"

    implementation fileTree(dir:'../core')
    implementation fileTree(dir:'../utils')
    implementation fileTree(dir:'../abi')
    //if you are using the *.jar files, ues the following line
    implementation fileTree(dir:'your path', include: '*.jar')

    implementation 'com.google.guava:guava:28.0-jre'

Maven dependencies

  <systemPath>your path</systemPath>
  <systemPath>your path</systemPath>
  <systemPath>your path</systemPath>

Use trident-java

ApiWrapper in package client is the entrance of the wrapped APIs and smart contract functions.

Initialize a ApiWrapper Instance

Before using functions in ApiWrapper, you should bind your private key to an ApiWrapper instance:

ApiWrapper wrapper = new ApiWrapper("grpc endpoint", "solidity grpc endpoint", "hex private key");

Any node can be used here. Alternatively, there are hardcoded initializers for the main net, Shasta and Nile test nets:

From version 0.1.1, as TronGrid requires API keys for the main net, an API key should be added to the initialization with ofMainnet.

//main net, using TronGrid
ApiWrapper wrapper = ApiWrapper.ofMainnet("hex private key", "API key");
//Shasta test net, using TronGrid
ApiWrapper wrapper = ApiWrapper.ofShasta("hex private key");
//Nile test net, using a node from Nile official website
ApiWrapper wrapper = ApiWrapper.ofNile("hex private key");


Private key binding

Private keys are used for signing transactions. That is, you can use any hexadecimal string that meets the length rule as the private key for data inquiries.


Functions in core are fully equipped with Javadoc. Generate if needed.