If a filename for a nonexistent or inaccessible file is passed to the MailcapCommandMap(String fileName) constructor, the resulting stack trace is dumped from MailcapFile(String fileName)
java.io.FileNotFoundException: SomeFileWhichDoesntExist
        at java.io.FileInputStream.<init>(FileInputStream.java)
        at java.io.FileReader.<init>(FileReader.java)
        at com.sun.activation.registries.MailcapFile.<init>(MailcapFile.java:41)
        at javax.activation.MailcapCommandMap.<init>(MailcapCommandMap.java:174)
        at javasoft.sqe.tests.api.javax.activation.MailcapCommandMap.MailcapCommandMapTest.subFileTest(MailcapCommandMapTest.java:130
        at javasoft.sqe.jck.lib.MultiTest.run(MultiTest.java:158)
        at javasoft.sqe.tests.api.javax.activation.MailcapCommandMap.MailcapCommandMapTest.main(MailcapCommandMapTest.java:29)

The MailcapFile constructor then passes the still null reader to this.createMailcapHash(reader), eventually leading to a NullPointerException.

Both the NullPointerException and the stack trace are unacceptable for FCS software.