Resolving 'java.net.MalformedURLException: unknown protocol: http-remoting' in Red Hat JBoss EAP 7.4.21

Environment

• Red Hat JBoss Enterprise Application Platform 7.4.21

Issue

• Client encounters the following error when attempting to connect weblaunch-based client to JBoss server:

java.net.MalformedURLException: unknown protocol: remote+http
	at java.base/java.net.URL.<init>(URL.java:681)
	at java.base/java.net.URL.<init>(URL.java:569)
	at java.base/java.net.URL.<init>(URL.java:516)

• Error stack includes "java.lang.NullPointerException: Cannot invoke "String.length()" because "this.input" is null" and traces back to URI parsing issues in Java's URI class.
• The error originates from URI.java:3167, indicating a problem with the URI format or configuration in the client's connection setup.
• Additional context suggests a potential resolution involves adding JBoss EJB client JARs to the client's classpath.

Resolution

• Make sure to use EAP_HOME\bin\client\jboss-client.jar in the application.
• To address this, the namingUrl must be normalized before being used to construct a URL object. As you’ve already identified, the correct approach is to replace the non-standard protocol with a supported one:

namingUrl = namingUrl
    .replace("remote+http://", "http://")
    .replace("remote+https://", "https://");

Root Cause

• This behavior is expected. The java.net.URL class does not recognize the remote+http (or remote-http) protocol, which leads to the MalformedURLException.
• The remote+http protocol is specific to EJB client communication and is typically used when invoking remote EJBs, for example:

     jndiProps.put(Context.PROVIDER_URL, "remote+http://localhost:8080");

• occurs at the following line in your code:

       URL url = new URL(new URL(namingUrl), path.toString());

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