Keycloak Admin REST API for Java

build.gradle

group 'com.thomasvitale.keycloak-demo'
version '1.0-SNAPSHOT'

apply plugin: 'java'

sourceCompatibility = 1.8

repositories {
    mavenCentral()
}

dependencies {
    compile group: 'org.keycloak', name: 'keycloak-admin-client', version: '3.3.0.CR2'
    //compile group: 'org.keycloak', name: 'keycloak-admin-client', version: '3.2.1.Final'
    compile group: 'org.jboss.resteasy', name: 'resteasy-jaxrs', version: '3.1.4.Final'
    compile group: 'org.jboss.resteasy', name: 'resteasy-client', version: '3.1.4.Final'
    compile group: 'org.jboss.resteasy', name: 'resteasy-jackson2-provider', version: '3.1.4.Final'
    testCompile group: 'junit', name: 'junit', version: '4.12'
}

Main.java

import com.sun.org.apache.regexp.internal.RE;
import org.jboss.resteasy.client.jaxrs.ResteasyClientBuilder;
import org.keycloak.admin.client.Keycloak;
import org.keycloak.admin.client.KeycloakBuilder;
import org.keycloak.admin.client.resource.UserResource;
import org.keycloak.admin.client.resource.UsersResource;
import org.keycloak.representations.idm.CredentialRepresentation;
import org.keycloak.representations.idm.UserRepresentation;

import java.util.Arrays;

public class Main {

    private static final String SERVER_URL = "http://localhost:8180/auth";
    private static final String REALM = "demo";
    private static final String USERNAME = "dumbledore";
    private static final String PASSWORD = "password";
    private static final String CLIENT_ID = "demo-client";

    public static void main(String[] args) {

        Keycloak keycloak = KeycloakBuilder
                .builder()
                .serverUrl(SERVER_URL)
                .realm(REALM)
                .username(USERNAME)
                .password(PASSWORD)
                .clientId(CLIENT_ID)
                .resteasyClient(new ResteasyClientBuilder().connectionPoolSize(10).build())
                .build();

        CredentialRepresentation credentialRepresentation = new CredentialRepresentation();
        credentialRepresentation.setType(CredentialRepresentation.PASSWORD);
        credentialRepresentation.setValue("12345678");

        UserRepresentation userRepresentation = new UserRepresentation();
        userRepresentation.setUsername("lupin");
        userRepresentation.setFirstName("Remus");
        userRepresentation.setLastName("Lupin");
        userRepresentation.setEnabled(true);
        userRepresentation.setCredentials(Arrays.asList(credentialRepresentation));
        //keycloak.realm(REALM).users().create(userRepresentation);

        UsersResource usersResource = keycloak.realm(REALM).users();
        UserRepresentation user = usersResource.search("lupin").get(0);
        user.setEmail("[email protected]");
        usersResource.get(user.getId()).update(user);
    }

}

Help! org.jboss.resteasy resteasy-client 3.1.4.Final

Exception in thread "main" java.lang.NoSuchMethodError: javax.ws.rs.core.UriBuilder.resolveTemplates(Ljava/util/Map;)Ljavax/ws/rs/core/UriBuilder; at org.jboss.resteasy.client.jaxrs.internal.ClientWebTarget.resolveTemplates(ClientWebTarget.java:177) at org.jboss.resteasy.client.jaxrs.internal.ClientWebTarget.resolveTemplates(ClientWebTarget.java:25) at org.jboss.resteasy.client.jaxrs.internal.proxy.SubResourceInvoker.invoke(SubResourceInvoker.java:71) at org.jboss.resteasy.client.jaxrs.internal.proxy.ClientProxy.invoke(ClientProxy.java:76) at com.sun.proxy.$Proxy20.realm(Unknown Source) at org.keycloak.admin.client.Keycloak.realm(Keycloak.java:116) at com.fit2cloud.mc.test.main(test.java:45)

https://stackoverflow.com/a/60471582/10311582 this helped me for the same issue.