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UDP packet may be truncated if it exceeds the maximum payload size of 4096
bytes. In this case, DNS ServiceDiscoverer will retry with TCP. However,
users should be able to configure higher capacity of the datagram packet


- Add `DefaultDnsServiceDiscovererBuilder#maxUdpPayloadSize` method;
- Fix `IllegalArgumentException` message for `minTTL` option;


Users can control the capacity of the datagram packet buffer.

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Maven Central

ServiceTalk is a JVM network application framework with APIs tailored to specific protocols (e.g. HTTP/1.x, HTTP/2.x, etc…​) and supports multiple programming paradigms.

It is built on Netty and is designed to provide most of the performance/scalability benefits of Netty for common networking protocols used in service to service communication. ServiceTalk provides server support and "smart client" like features such as client-side load balancing and service discovery integration.

See the ServiceTalk docs for more information.

Getting Started

ServiceTalk releases are available on Maven Central.

For Gradle as well as other build tools that don’t use Maven Central as a default repository, additional configuration is required.

Gradle, build.gradle
repositories {
  jcenter() // combines Maven Central and other popular repositories

Refer to the ServiceTalk docs for various examples that will get you started with the different features of ServiceTalk.

Builds of the development version are available in Sonatype’s snapshots Maven repository.

Supported JVM

The minimum supported JDK version is 1.8.


ServiceTalk follows SemVer 2.0.0. API/ABI breaking changes will require package renaming for that module to avoid runtime classpath conflicts.

0.x.y releases are not stable and are permitted to break API/ABI.

Contributor Setup

If you’re intending to contribute to ServiceTalk, make sure to first read the contribution guidelines.

ServiceTalk uses Gradle as its build tool and only requires JDK 8 or higher to be pre-installed. ServiceTalk ships with the Gradle Wrapper, which means that there is no need to install Gradle on your machine beforehand.

File Encoding

ServiceTalk’s source code is UTF-8 encoded: make sure your filesystem supports it before attempting to build the project. Setting the JAVA_TOOL_OPTIONS env var to -Dfile.encoding=UTF-8 should help building the project in non-UTF-8 environments. Editors and IDEs must also support UTF-8 in order to successfully edit ServiceTalk’s source code.

Gradle Repositories

ServiceTalk’s build produces custom Gradle plugins and thus has regular (i.e. non-buildscript) dependencies on other plugins. This is the reason why the repositories that are provided if none are configured globally are the following:

allprojects {
  buildscript {
    repositories {
      maven { url "" }
  repositories {
    maven { url "" }

If you have defined repositories or repository mirrors in your global Gradle config (~/.gradle/init.gradle), the build will detect them and attempt to inherit buildscript repositories into the main repositories of the sub-projects that produce custom Gradle plugins.

This inheritance mechanism can be disabled by setting a Gradle property:

Build Commands

You should be able to run the following command to build ServiceTalk and verify that all tests and code quality checks pass:

$ ./gradlew build

The supported IDE is IntelliJ IDEA. In order to generate IntelliJ IDEA project files for ServiceTalk, you can run the following command:

$ ./gradlew idea

When done, running one of following commands would open ServiceTalk in IntelliJ:

$ idea .
$ open servicetalk.ipr

Project Communication

We encourage your participation asking questions and helping improve the ServiceTalk project. Github issues and pull requests are the primary mechanisms of participation and communication for ServiceTalk.

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