Apache Cayenne "Class is not mapped with Cayenne"

I am using Apache Cayenne to store data and check it against files to see if the file has been changed. I currently have a method that inserts data into my database but I am receiving:

Exception in thread "main" java.lang.IllegalArgumentException: Class is not mapped with Cayenne: edu.ndsu.eci.duo_demo.persist.Integrations
    at org.apache.cayenne.access.DataContext.newObject(DataContext.java:471)
    at edu.ndsu.eci.duo_demo.util.IntegrationService.insertData(IntegrationService.java:31)
    at edu.ndsu.eci.duo_demo.main.ServiceMain.main(ServiceMain.java:55)

My method:

public static void insertData(Integration i, ObjectContext context) {
    Integrations integ = context.newObject(Integrations.class);
    integ.setName(i.getName());
    integ.setEnrollPolicy(i.getEnrollPolicy());

    List<String> ipWhitelist = i.getIpWhitelist();
    String ip = "[";
    if(ipWhitelist.size() > 0)
      ip += "\"";
    for(int j = 0; j < ipWhitelist.size(); j++) {
      ip += ipWhitelist.get(j) + "\"";
      if(j < ipWhitelist.size()-1)
        ip += ",\"";
    }
    ip += "]";

    integ.setIpWhitelist(ip);
    context.commitChanges();
  }

Edit

My log output:

[main] DEBUG org.apache.cayenne.configuration.server.DataDomainProvider  - starting configuration loading: [cayenne.xml]
[main] DEBUG org.apache.cayenne.configuration.server.DataDomainProvider  - starting configuration loading: [cayenne.xml]
[main] INFO  org.apache.cayenne.configuration.XMLDataChannelDescriptorLoader  - Loading XML configuration resource from file:/home/stkarsch/git/duo-integration-verification/target/classes/cayenne.xml
[main] INFO org.apache.cayenne.configuration.XMLDataChannelDescriptorLoader  - Loading XML configuration resource from file:/home/stkarsch/git/duo-integration-verification/target/classes/cayenne.xml
[main] INFO  org.apache.cayenne.configuration.XMLDataChannelDescriptorLoader  - tag <domains> is unexpected at [36,2]. The following tags are allowed here: [domain]
[main] INFO org.apache.cayenne.configuration.XMLDataChannelDescriptorLoader  - tag <domains> is unexpected at [36,2]. The following tags are allowed here: [domain]
[main] DEBUG org.apache.cayenne.configuration.server.DataDomainProvider  - finished configuration loading in 22 ms.
[main] DEBUG org.apache.cayenne.configuration.server.DataDomainProvider  - finished configuration loading in 22 ms.
[main] DEBUG org.apache.cayenne.access.DataRowStore  - DataRowStore property cayenne.DataRowStore.snapshot.size = 10000
[main] DEBUG org.apache.cayenne.access.DataRowStore  - DataRowStore property cayenne.DataRowStore.snapshot.size = 10000

Initialization of my ServerRuntime:

ServerRuntime run = ServerRuntime.builder().addConfig("cayenne.xml").build();
ObjectContext context = run.getContext();

Solution

From the startup log it appears that you have an old "cayenne.xml" file running with a newer runtime:

 tag <domains> is unexpected at [36,2]. The following tags are allowed here: [domain]

IIRC <domains> is pre 3.1, while runtime looks like either 3.1 or 4.0. So I suggest the following:

Figure out what Cayenne version is in use in runtime.
Download Cayenne distro for this version.
Open your "cayenne.xml" file using CayenneModeler app from the distro. It should ask whether you want to upgrade.
Proceed with upgrade.
Very likely the project will be renamed from "cayenne.xml" to "cayenne-project.xml" So confirm what the new name is and use it when creating ServerRuntime