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https://issues.apache.org/jira/browse/CAMEL-8520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14370837#comment-14370837
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Claus Ibsen commented on CAMEL-8520:
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I dont think its a Camel problem. The init code is called when I run an unit
test. But it seems those DNS classes that it attempts to load are not in the
classpath. So you may need to add some JARs to include the resolver classes.
> Camel XMPP doesn't use a DNS resolver to look at SRV records
> ------------------------------------------------------------
>
> Key: CAMEL-8520
> URL: https://issues.apache.org/jira/browse/CAMEL-8520
> Project: Camel
> Issue Type: Bug
> Components: camel-xmpp
> Affects Versions: 2.15.0
> Reporter: Ben Harris
>
> Camel XMPP doesn't use a DNS resolver to look at SRV records, whereas in
> 2.14.1 it did.
> In 2.15.0, ConnectionConfiguration calls
> {{DNSUtil.resolveXMPPDomain(serviceName)}} which runs this code:
> {code:title=DNSUtil.java|borderStyle=solid}
> public static List<HostAddress> resolveXMPPDomain(final String domain) {
> if (dnsResolver == null) {
> List<HostAddress> addresses = new ArrayList<HostAddress>(1);
> addresses.add(new HostAddress(domain, 5222));
> return addresses;
> }
> return resolveDomain(domain, 'c');
> }
> {code}
> dnsResolver is never initialised, so it returns the service name, in my case
> 'jabberzac.org', instead of the actual XMPP server from the SRV Record,
> 'xmpp.jabberzac.org', which then causes a timeout.
> The dnsResolver is meant to be instantiated in init(), which is meant to be
> called by SmackConfiguration, but never is.
> {code:title=DNSUtil.java|borderStyle=solid}
> /**
> * Initializes DNSUtil. This method is automatically called by
> SmackConfiguration, you don't
> * have to call it manually.
> */
> public static void init() {
> final String[] RESOLVERS = new String[] { "javax.JavaxResolver",
> "minidns.MiniDnsResolver",
> "dnsjava.DNSJavaResolver" };
> for (String resolver :RESOLVERS) {
> DNSResolver availableResolver = null;
> String resolverFull = "org.jivesoftware.smack.util.dns" +
> resolver;
> try {
> Class<?> resolverClass = Class.forName(resolverFull);
> Method getInstanceMethod =
> resolverClass.getMethod("getInstance");
> availableResolver = (DNSResolver)
> getInstanceMethod.invoke(null);
> if (availableResolver != null) {
> setDNSResolver(availableResolver);
> break;
> }
> }
> catch
> (ClassNotFoundException|NoSuchMethodException|SecurityException|IllegalAccessException|IllegalArgumentException|InvocationTargetException
> e) {
> LOGGER.log(Level.FINE, "Exception on init", e);
> }
> }
> }
> {code}
> 2.14.1 doesn't seem to have this problem as DNSUtil class in 2.14.1 doesn't
> have an init() function which is meant to be 'automatically called', it just
> has a static code block:
> {code}
> static {
> try {
> Hashtable env = new Hashtable();
> env.put("java.naming.factory.initial",
> "com.sun.jndi.dns.DnsContextFactory");
> context = new InitialDirContext(env);
> }
> catch (Exception e) {
> // Ignore.
> }
> }
> {code}
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