Bug ID: JDK-6806783 Regression : NullPointerException comes to occur in 1.4.2_15

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1.4.2_21Resolved

A Customer migrate to 1.4.2_15( or later).
They have found NullPointerException come to occur.

java.lang.NullPointerException
	at com.sun.jndi.dns.Resolver.query(Resolver.java:64)
	at com.sun.jndi.dns.Resolver.findSoa(Resolver.java:135)
	at com.sun.jndi.dns.DnsContext.isZoneCurrent(DnsContext.java:892)
	at com.sun.jndi.dns.DnsContext.getNameNode(DnsContext.java:806)
	at com.sun.jndi.dns.DnsContext.c_list(DnsContext.java:298)
	at com.sun.jndi.toolkit.ctx.ComponentContext.p_list(ComponentContext.java:555)
	at com.sun.jndi.toolkit.ctx.PartialCompositeContext.list(PartialCompositeContext.java:273)
	at com.sun.jndi.toolkit.ctx.PartialCompositeContext.list(PartialCompositeContext.java:262)
	at javax.naming.InitialContext.list(InitialContext.java:387)
	at TestNPE142.main(TestNPE142.java:74)


CONFIGURATION : 
 Solaris10/jdk1.4.2_15 - 1.4.2_20ea

NOTE : 
This exception did not occur in 1.4.2_14 and earlier.

REPRODUCE :
 1. Edit the attached TestNPE142.java for your environmet compile
    (IP address of DNS and domainname should be changed.)
 2. Edit the attached run3.csh and invoke.
    (JDK path should be changed.)

We can always reproduce.

Duplicate :	JDK-6585239 - Regression: 2 DNS tests fail with JDK 5.0u13 b01 and pass with 5.0u12fcs
Relates :	JDK-5053708 - DNS provider does not cleanup resources properly