Getting java.lang.ClassNotFoundException: com.sun.jndi.dns.DnsContextFactory in JBoss EAP 8

Solution Verified - Updated

Environment

  • Red Hat JBoss Enterprise Application Platform (EAP)
    • 8.x

Issue

When trying to deploy an application in EAP 8 GA, the following exception is thrown:

Caused by: javax.naming.NamingException: WFLYNAM0027: Failed instantiate InitialContextFactory com.sun.jndi.dns.DnsContextFactory from classloader ModuleClassLoader for Module "MyWebApp.war" from Service Module Loader [Root exception is java.lang.ClassNotFoundException: com.sun.jndi.dns.DnsContextFactory from [Module "MyWebApp.war" from Service Module Loader]]
	at org.jboss.as.naming@8.0.0.GA-redhat-00011//org.jboss.as.naming.InitialContext.getDefaultInitCtx(InitialContext.java:120)
	at org.jboss.as.naming@8.0.0.GA-redhat-00011//org.jboss.as.naming.InitialContext.init(InitialContext.java:101)
	at java.naming/javax.naming.ldap.InitialLdapContext.<init>(InitialLdapContext.java:154)
	at org.jboss.as.naming@8.0.0.GA-redhat-00011//org.jboss.as.naming.InitialContext.<init>(InitialContext.java:91)
	at org.jboss.as.naming@8.0.0.GA-redhat-00011//org.jboss.as.naming.InitialContextFactory.getInitialContext(InitialContextFactory.java:43)
	at java.naming/javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:732)
	at java.naming/javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:305)
	at java.naming/javax.naming.InitialContext.init(InitialContext.java:236)
	at java.naming/javax.naming.InitialContext.<init>(InitialContext.java:208)
	at java.naming/javax.naming.directory.InitialDirContext.<init>(InitialDirContext.java:130)
	at MyWebApp.war//org.example.module.SubModule.ClassName.methodName(JndiDnsClient.java:73)
	... 130 more
Caused by: java.lang.ClassNotFoundException: com.sun.jndi.dns.DnsContextFactory from [Module "MyWebApp.war" from Service Module Loader]
	at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:200)
	at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:410)
	at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:398)
	at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:116)
	at java.base/java.lang.Class.forName0(Native Method)
	at java.base/java.lang.Class.forName(Class.java:467)
	at org.jboss.as.naming@8.0.0.GA-redhat-00011//org.jboss.as.naming.InitialContext.getDefaultInitCtx(InitialContext.java:115)

Resolution

The solution is to add the module jdk.naming.dns to the deployment's jboss-deployment-structure.xml.

Root Cause

jdk.naming.dns is a dependency of the sun.jdk module, which has been deprecated in EAP 8 GA.

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