Typo.
Better reporting of an exception.
http://mail.openjdk.java.net/pipermail/jdk7-dev/2010-October/001603.html
java.lang.NumberFormatException: For input string: "abc:0:123::4"
	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
	at java.lang.Integer.parseInt(Integer.java:481)
	at java.lang.Integer.parseInt(Integer.java:514)
	at com.sun.jndi.dns.DnsClient.<init>(DnsClient.java:122)
	at com.sun.jndi.dns.Resolver.<init>(Resolver.java:61)
	at com.sun.jndi.dns.DnsContext.getResolver(DnsContext.java:570)
	at com.sun.jndi.dns.DnsContext.c_getAttributes(DnsContext.java:430)
	at com.sun.jndi.toolkit.ctx.ComponentDirContext.p_getAttributes(ComponentDirContext.java:231)
	at com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.getAttributes(PartialCompositeDirContext.java:139)
	at com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.getAttributes(PartialCompositeDirContext.java:127)
	at javax.naming.directory.InitialDirContext.getAttributes(InitialDirContext.java:140)
	at hudson.plugins.active_directory.ActiveDirectorySecurityRealm$DesciprotrImpl.obtainLDAPServer(ActiveDirectorySecurityRealm.java:502)
	at hudson.plugins.active_directory.ActiveDirectorySecurityRealm$DesciprotrImpl.obtainLDAPServer(ActiveDirectorySecurityRealm.java:460)
	at hudson.plugins.active_directory.ActiveDirectoryUnixAuthenticationProvider.obtainLDAPServers(ActiveDirectoryUnixAuthenticationProvider.java:202)
	at hudson.plugins.active_directory.ActiveDirectoryUnixAuthenticationProvider.access$300(ActiveDirectoryUnixAuthenticationProvider.java:40)
	at hudson.plugins.active_directory.ActiveDirectoryUnixAuthenticationProvider$1.compute(ActiveDirectoryUnixAuthenticationProvider.java:69)
	at hudson.plugins.active_directory.ActiveDirectoryUnixAuthenticationProvider$1.compute(ActiveDirectoryUnixAuthenticationProvider.java:59)
	at hudson.plugins.active_directory.Cache.get(Cache.java:38)
	at hudson.plugins.active_directory.ActiveDirectoryUnixAuthenticationProvider.loadGroupByGroupname(ActiveDirectoryUnixAuthenticationProvider.java:316)
	at hudson.plugins.active_directory.ActiveDirectorySecurityRealm.loadGroupByGroupname(ActiveDirectorySecurityRealm.java:569)