ant run fails every time; ant cleancompile seems to run fine

Following both DataExtraction samples, I get snagged on the "ant run" step and don't know where to look for a solution. Here's a snippet of what I type and what results:

localhost:/opt/adobe/livecycle8/LiveCycle_ES_SDK/samples/Forms/DataExtractionandUpdateDB/b uild # ant run
Buildfile: build.xml

run:
[java] java.lang.IllegalStateException
[java] at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:180)
[java] at org.apache.tools.ant.taskdefs.Java.run(Java.java:710)
[java] at
...
[java] at java.lang.reflect.Method.invoke(Method.java:585)
[java] at org.apache.tools.ant.taskdefs.ExecuteJava.run(ExecuteJava.java:202)
[java] at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:134)
[java] ... 15 more
...
[java] Caused by: java.lang.NoClassDefFoundError: javax/ejb/EJBException
[java] at com.adobe.idp.dsc.clientsdk.ServiceClientFactory.evaluateMessageDispatcher(ServiceClientF actory.java:512)
[java] at com.adobe.idp.dsc.clientsdk.ServiceClient.invoke(ServiceClient.java:215)
[java] ... 23 more

BUILD SUCCESSFUL
Total time: 0 seconds