Thanks for the quick response. I assumed (perhaps incorrectly) that when 
port mappings are supplied, they would be 'exposed'. 
I added your suggestion and still receive an error, but interesting that it 
is a bit different. 

C:>java -jar jacococli.jar dump --destfile ST-Startup.exec
[INFO] Connecting to localhost/127.0.0.1:6300.
Exception in thread "main" java.net.SocketException: Software caused 
connection abort: socket write error
        at java.base/java.net.SocketOutputStream.socketWrite0(Native Method)
        at 
java.base/java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:110)
        at 
java.base/java.net.SocketOutputStream.write(SocketOutputStream.java:129)
        at 
java.base/java.io.DataOutputStream.writeChar(DataOutputStream.java:182)
        at 
org.jacoco.cli.internal.core.data.ExecutionDataWriter.writeHeader(ExecutionDataWriter.java:73)
        at 
org.jacoco.cli.internal.core.data.ExecutionDataWriter.<init>(ExecutionDataWriter.java:61)
        at 
org.jacoco.cli.internal.core.runtime.RemoteControlWriter.<init>(RemoteControlWriter.java:40)
        at 
org.jacoco.cli.internal.core.tools.ExecDumpClient.dump(ExecDumpClient.java:117)
        at 
org.jacoco.cli.internal.core.tools.ExecDumpClient.dump(ExecDumpClient.java:98)
        at org.jacoco.cli.internal.commands.Dump.execute(Dump.java:69)
        at org.jacoco.cli.internal.Main.execute(Main.java:89)
        at org.jacoco.cli.internal.Main.main(Main.java:104)

I'll do some more digging in the docker info.

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