Since upgrading from integrity-plugin 1.28 -> 1.29, we are no longer able to connect to our MKS instance. The "Test Connection" feature reports: "Failed to establish connection!"

The Jenkins logs report the following:

Feb 04, 2015 3:29:55 PM FINE IntegritySCM
Testing Integrity API Connection...
Feb 04, 2015 3:29:55 PM FINE IntegritySCM
hostName: [server name]
Feb 04, 2015 3:29:55 PM FINE IntegritySCM
port: 7001
Feb 04, 2015 3:29:55 PM FINE IntegritySCM
userName: [user name]
Feb 04, 2015 3:29:55 PM FINE IntegritySCM
password: [password]
Feb 04, 2015 3:29:55 PM FINE IntegritySCM
secure: false
Feb 04, 2015 3:29:55 PM FINE IntegritySCM
ipHostName:
Feb 04, 2015 3:29:55 PM FINE IntegritySCM
ipPort: 0
Feb 04, 2015 3:29:55 PM FINE IntegritySCM
Creating Integrity API Session...
Feb 04, 2015 3:29:55 PM SEVERE hudson.scm.APISession create
API Exception caught...
Feb 04, 2015 3:29:55 PM SEVERE hudson.scm.APISession create
Unexpected HTTP status: Internal Server Error
Feb 04, 2015 3:29:55 PM FINE IntegritySCM
returned exit code -1
Feb 04, 2015 3:29:55 PM SEVERE hudson.scm.APISession create
APIException

The MKS server reports the following error when I recreate the HTTP request:

java.lang.NullPointerException
com.mks.api.common.BlimpLib.isProtocolVersionSupported(BlimpLib.java:110)
mks.frame.app.ui.cli.BlimpIO.<init>(BlimpIO.java:449)
mks.frame.app.ui.api.APIBlimpIO.<init>(APIBlimpIO.java:284)
mks.ic.common.ui.xml.XMLBlimpIO.<init>(XMLBlimpIO.java:157)
mks.ic.common.ui.xml.ICAPIBlimpServlet.createBlimpIO(ICAPIBlimpServlet.java:42)
mks.frame.app.ui.cli.BlimpServlet.invokeCommand(BlimpServlet.java:263)
mks.frame.app.ui.cli.BlimpServlet.service(BlimpServlet.java:213)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)