If one runs
javakey -gk <name> DSA <key len>

(with JDK1.1.6)
one gets:

javakey -gk "AV_Beans_CA" DSA 512
java.lang.NullPointerException
        at sun.security.provider.Main.generateKeyPair(Main.java:1022)
        at sun.security.provider.Main.generateCmd(Main.java:721)
        at sun.security.provider.Main.run(Main.java:1394)
        at sun.security.provider.Main.main(Main.java:1423)

javakey -gk "AV_Beans_CA" DSA 512 AV_Beans_CA_pub AV_Beans_CA_priv

works fine.