Impossible cast from javax.naming.CompositeName to com.sun.jndi.dns.DnsName in compareRange(int, int, Name) in DnsName.java

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Bug report generated from FindBugs
Impossible cast from javax.naming.CompositeName to com.sun.jndi.dns.DnsName in 
compareRange(int, int, Name)

In class com.sun.jndi.dns.DnsName
  In method compareRange(int, int, Name)
  Actual type javax.naming.CompositeName
  Expected com.sun.jndi.dns.DnsName
  Value loaded from n
  At DnsName.java:[line 390]

Relevant source code:
  386:    * greater than those of "n".
  387:    */
  388:   private int compareRange(int beg, int end, Name n) {
  389:       if (n instanceof CompositeName) {
  390:           n = (DnsName) n;                    // force ClassCastException
  391:       }
  392:       // Loop through labels, starting with most significant.
  393:       int minSize = Math.min(end - beg, n.size());
  394:       for (int i = 0; i < minSize; i++) {

Bug pattern explanation:
This cast will always throw a ClassCastException. FindBugs tracks type 
information from instanceof checks, and also uses more precise information 
about the types of values returned from methods and loaded from fields. Thus, 
it may have more precise information that just the declared type of a 
variable, and can use this to determine that a cast will always throw an 
exception at runtime.



FindBugs issue identifier (do not modify or remove): 
b9c5e422ce21dc230c2d8195629f9ab1

Original issue reported on code.google.com by keithl on 24 Feb 2010 at 3:16

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Original comment by keithl on 24 Feb 2010 at 3:17

• Changed state: Invalid