java - How can I work around this JRE bug in getNetworkPrefixLength()? -

there appears known bug in jre implementation:

• http://bugs.java.com/view_bug.do?bug_id=6707289
• https://bugs.openjdk.java.net/browse/jdk-7107883

but how can fix without updating jre/jdk? need broadcast address, , use getbroadcast() this, returns 0.0.0.0 (because getnetworkprefixlength() returns -1, although real network mask 24).