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.
'org.labkey:labkey-client-api:0.1'
<dependency>
<groupId>org.labkey</groupId>
<artifactId>labkey-client-api</artifactId>
<version>0.1</version>
</dependency>
<dependency org="org.labkey" name="labkey-client-api" rev="0.1"/>
"org.labkey", "labkey-client-api", "0.1"