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The client-side library for Java developers is a separate JAR from the LabKey Server code base. It can be used by any Java program, including another Java web application.

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/*
 * Copyright (c) 2011-2015 LabKey Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.labkey.remoteapi.test;

import org.labkey.remoteapi.CommandException;
import org.labkey.remoteapi.Connection;
import org.labkey.remoteapi.pipeline.FileNotificationCommand;

/**
 * Demo code that notifies server that files may become available under a pipeline root, which releases
 * queued pipeline jobs that are blocked awaiting those files.
 *
 * By default looks for a config.properties in the working directory, but the location can be specified with a
 * -config=<PATH TO CONFIG FILE> argument.
 *
 * Expects the following config properties:
 * baseServerURL: base URL of the LabKey Server, such as "http://www.labkey.org"
 * username: credentials for logging in
 * password: credentials for logging in
 * folder: Path of the LabKey Server container to which the notification should be directed
 * debug: (Optional) If true, print verbose HTTP connection debugging information
 *
 */
public class PipelineFileAvailableClient
{

    public static void main(String... args) throws Exception
    {
        ClientConfig config = new ClientConfig(args);
        Connection connection = config.createConnection();

        try
        {
            // Create the command an execute it against our target folder
            FileNotificationCommand notificationCommand = new FileNotificationCommand();
            notificationCommand.execute(connection, config.getProperty("folder"));
            System.out.println("Success!");
        }
        catch(CommandException e)
        {
            System.err.println((new StringBuilder()).append("Failure! Response code: ").append(e.getStatusCode()).toString());
            e.printStackTrace();
            System.err.println();
            if(e.getResponseText() != null)
            {
                System.err.println("Response text: ");
                System.err.println(e.getResponseText());
            }
        }
    }
}