Why does my CCM plugin cause a StackOverflowError in Launch callback handler?

I have been developing a server-side participant plugin against my development copy of CCM 4.0.3. I was successfully able to deploy and use it locally during development.

After I installed Jazz and CCM 4.0.6 locally to match our new production environment, and deployed my plugin to this new installation, I am getting the following error in my Tomcat window:

INFO: Deploying web application archive C:\Program Files\IBM\JazzTeamServer_406_Dev\server\tomcat\webapps\ccm.war
Exception in thread "Launch callback handler" java.lang.StackOverflowError
        at java.nio.CharBuffer.wrap(CharBuffer.java:361)
        at sun.nio.cs.StreamEncoder$CharsetSE.implWrite(StreamEncoder.java:399)
        at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:159)
        at java.io.OutputStreamWriter.emptyBuffer(OutputStreamWriter.java:289)
        at java.io.OutputStreamWriter.write(OutputStreamWriter.java:251)
        at java.io.PrintWriter.write(PrintWriter.java:423)
        at java.io.PrintWriter.write(PrintWriter.java:440)
        at java.io.PrintWriter.print(PrintWriter.java:570)
        at java.io.PrintWriter.println(PrintWriter.java:706)
        at com.ibm.team.repository.provision.internal.ProvisionService.installFeature(ProvisionServi
ce.java:382)
        at com.ibm.team.repository.provision.internal.ProvisionService.installFeature(ProvisionServi
ce.java:408)
        at com.ibm.team.repository.provision.internal.ProvisionService.installFeature(ProvisionServi
ce.java:408)
    (*above line repeats many times *)
 at com.ibm.team.repository.provision.internal.ProvisionService.installFromProfileProperties(
ProvisionService.java:952)
        at com.ibm.team.repository.provision.internal.ProvisionService.installFromProfiles(Provision
Service.java:1009)
        at com.ibm.team.repository.provision.internal.ProvisionService.installFromProfileNoWait(Prov
isionService.java:1143)
        at com.ibm.team.repository.provision.internal.ProvisionService.installFromProfile(ProvisionS
ervice.java:1081)
        at com.ibm.team.repository.provision.internal.ProvisionService.installFromContextConfigurati
onUrl(ProvisionService.java:1160)
        at com.ibm.team.jfs.app.install.Activator$1.run(Activator.java:172)
        at java.lang.Thread.run(Thread.java:761)

The steps I took are:

1. Install Jazz server and apps (v.4.0.6).
2. Upgrade my RTC client from 4.0.3 to 4.0.6.
3. Clear feature and plugin jars from my plugin's update-site.
4. "Rebuild All" in update site and copy update site to server/conf/ccm/sites to match previous setup
5. Copy old provision profile .ini file to new location
6. Start server

Please let me know what other information I might need to provide to diagnose this.