EAP 7 fails to start with modcluster ssl config

Issue

• We've configured our modcluster subsystem to use ssl communicating with our httpd mod_cluster balancer like below:

        <subsystem xmlns="urn:jboss:domain:modcluster:1.2">
                    <ssl ca-certificate-file="/path/to/truststore.jks" password="pass"/>

• But then start up fails with the following error. Why is JBoss looking for this .keystore and where is this configured?

ERROR [org.jboss.as.controller.management-operation] (ServerService Thread Pool -- 64) WFLYCTL0013: Operation ("add") failed - address: ([("subsystem" => "modcluster")]): java.lang.IllegalStateException: java.io.FileNotFoundException: /home/username/.keystore (No such file or directory)
    at org.jboss.modcluster.mcmp.impl.JSSESocketFactory.<init>(JSSESocketFactory.java:112)
    at org.wildfly.extension.mod_cluster.ProxyConfigurationServiceConfigurator.configure(ProxyConfigurationServiceConfigurator.java:309)
    at org.wildfly.extension.mod_cluster.ModClusterSubsystemServiceHandler.installServices(ModClusterSubsystemServiceHandler.java:91)
    at org.jboss.as.clustering.controller.AddStepHandler.performRuntime(AddStepHandler.java:220)
    at org.jboss.as.controller.AbstractAddStepHandler.performRuntime(AbstractAddStepHandler.java:343)
    at org.jboss.as.controller.AbstractAddStepHandler$1.execute(AbstractAddStepHandler.java:164)
    at org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:1040)
    at org.jboss.as.controller.AbstractOperationContext.processStages(AbstractOperationContext.java:779)
    at org.jboss.as.controller.AbstractOperationContext.executeOperation(AbstractOperationContext.java:468)
    at org.jboss.as.controller.ParallelBootOperationStepHandler$ParallelBootTask.run(ParallelBootOperationStepHandler.java:384)
    at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
    at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1990)
    at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
    at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1348)
    at java.lang.Thread.run(Thread.java:748)
    at org.jboss.threads.JBossThread.run(JBossThread.java:513)
Caused by: java.io.FileNotFoundException: /home/aogburn/.keystore (No such file or directory)
    at java.io.FileInputStream.open0(Native Method)
    at java.io.FileInputStream.open(FileInputStream.java:195)
    at java.io.FileInputStream.<init>(FileInputStream.java:138)
    at org.jboss.modcluster.mcmp.impl.JSSESocketFactory.getStore(JSSESocketFactory.java:223)
    at org.jboss.modcluster.mcmp.impl.JSSESocketFactory.getKeystore(JSSESocketFactory.java:178)
    at org.jboss.modcluster.mcmp.impl.JSSESocketFactory.getKeyManagers(JSSESocketFactory.java:250)
    at org.jboss.modcluster.mcmp.impl.JSSESocketFactory.<init>(JSSESocketFactory.java:97)
    ... 15 more