which repository has eXist and how is it added to the classpath with gradle?

Looking to import the eXist database, as well as additional dependencies.

What repositories work best for this requirements?

stack trace for build:

thufir@dur:~/NetBeansProjects/twitterBaseX$ 
thufir@dur:~/NetBeansProjects/twitterBaseX$ gradle clean build 
> Task :compileJava FAILED                                                        
FAILURE: Build failed with an exception.                                          
* What went wrong:
Execution failed for task ':compileJava'.
> Could not resolve all files for configuration ':compileClasspath'.
> Could not find org.exist-db.thirdparty.com.thaiopensource:jing:20151127.
Searched in the following locations:
- https://repo.maven.apache.org/maven2/org/exist-db/thirdparty/com/thaiopensource/jing/20151127/jing-20151127.pom
- https://repo.maven.apache.org/maven2/org/exist-db/thirdparty/com/thaiopensource/jing/20151127/jing-20151127.jar
- https://mvnrepository.com/org/exist-db/thirdparty/com/thaiopensource/jing/20151127/jing-20151127.pom
- https://mvnrepository.com/org/exist-db/thirdparty/com/thaiopensource/jing/20151127/jing-20151127.jar
- https://jcenter.bintray.com/org/exist-db/thirdparty/com/thaiopensource/jing/20151127/jing-20151127.pom
- https://jcenter.bintray.com/org/exist-db/thirdparty/com/thaiopensource/jing/20151127/jing-20151127.jar
Required by:
project : > org.exist-db:exist-core:5.2.0
> Could not find org.exist-db.thirdparty.javax.xml.xquery:xqjapi:1.0-fr.
Searched in the following locations:
- https://repo.maven.apache.org/maven2/org/exist-db/thirdparty/javax/xml/xquery/xqjapi/1.0-fr/xqjapi-1.0-fr.pom
- https://repo.maven.apache.org/maven2/org/exist-db/thirdparty/javax/xml/xquery/xqjapi/1.0-fr/xqjapi-1.0-fr.jar
- https://mvnrepository.com/org/exist-db/thirdparty/javax/xml/xquery/xqjapi/1.0-fr/xqjapi-1.0-fr.pom
- https://mvnrepository.com/org/exist-db/thirdparty/javax/xml/xquery/xqjapi/1.0-fr/xqjapi-1.0-fr.jar
- https://jcenter.bintray.com/org/exist-db/thirdparty/javax/xml/xquery/xqjapi/1.0-fr/xqjapi-1.0-fr.pom
- https://jcenter.bintray.com/org/exist-db/thirdparty/javax/xml/xquery/xqjapi/1.0-fr/xqjapi-1.0-fr.jar
Required by:
project : > org.exist-db:exist-core:5.2.0
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 3s
2 actionable tasks: 2 executed
thufir@dur:~/NetBeansProjects/twitterBaseX$                                       

it's only the import for exist-db which seems to be causing trouble:

/*
* This file was generated by the Gradle 'init' task.
*
* This generated file contains a sample Java project to get you started.
* For more details take a look at the Java Quickstart chapter in the Gradle
* User Manual available at https://docs.gradle.org/5.4.1/userguide/tutorial_java_projects.html
*/
plugins {
// Apply the java plugin to add support for Java
id 'java'
// Apply the application plugin to add support for building an application
id 'application'
}
repositories {
// Use jcenter for resolving your dependencies.
// You can declare any Maven/Ivy/file repository here.
mavenCentral()
//
//maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
maven { url "https://mvnrepository.com/" }
jcenter()
}
dependencies {
// This dependency is found on compile classpath of this component and consumers.
implementation 'com.google.guava:guava:27.0.1-jre'
// Use TestNG framework, also requires calling test.useTestNG() below
testImplementation 'org.testng:testng:6.14.3'
compile group: 'org.twitter4j', name: 'twitter4j-core', version: '4.0.1'
compile group: 'org.basex', name: 'basex', version: '9.2.4'
compile group: 'net.sf.xmldb-org', name: 'xmldb-api', version: '1.7.0'
// https://mvnrepository.com/artifact/org.exist-db/exist-core
compile group: 'org.exist-db', name: 'exist-core', version: '5.2.0'
}
// Define the main class for the application
mainClassName = 'twitterBaseX.App'
test {
// Use TestNG for unit tests
useTestNG()
}

as commenting out that compile group allows a clean build. Presumably it's a question of adding the correct repo's properly?

For eXist-db 5.x.x you need two repositories:

1. Maven Central for the eXist-db artifacts themselves.
2. eXist-db's Repository (http://repo.evolvedbinary.com/repository/exist-db/) for some third-party artifacts which cannot be published to Maven Central as they do not meet the requirements for Maven Central.