Valid Constructs Occassionally Result in Compilation Errors in Maven

When running "mvn install", the following is occasionally encountered:

C:\alrubinger\business\jboss\wc\jbossas\projects\ejb3\core\src\test\java\org\jbo
ss\ejb3\test\ejbthree963\MyStatefulBean.java:[44,47] cannot find symbol
symbol : variable JNDI_NAME
location: interface org.jboss.ejb3.test.ejbthree963.MyStatefulHome

C:\alrubinger\business\jboss\wc\jbossas\projects\ejb3\core\src\test\java\org\jbo
ss\ejb3\test\ejbthree1127\Test21WithNoRemoteInterfaceDefinedBean.java:[40,47] ca
nnot find symbol
symbol : variable JNDI_NAME
location: interface org.jboss.ejb3.test.ejbthree1127.TestRemoteHome

C:\alrubinger\business\jboss\wc\jbossas\projects\ejb3\core\src\test\java\org\jbo
ss\ejb3\test\ejbthree1071\StatefulRemoteBean.java:[23,43] cannot find symbol
symbol : variable JNDI_NAME_REMOTE
location: interface org.jboss.ejb3.test.ejbthree1071.StatefulRemote

...these are valid constructs that should be visible to the compiler.