![]() Jetty is another application server (this one developed by Eclipse Foundation) that isn’t technically a fully featured Java EE container. With good documentation and no shortage of tutorials about it on the internet, Tomcat is a serious contender for the role of application server in almost all Java web applications. So Tomcat is mature, well-documented, and the most widely used Java application server. I’m guessing you’re looking for a solution and aren’t that interested in terminology intricacies, so I’ll keep calling Tomcat (and later Jetty) an application server to avoid complicating things with too many terms. The bottom line is that you can run Java EE applications on Tomcat. You’ll just need to include them as additional third-party dependencies in your application. But even though Tomcat doesn’t support some Java EE features out of the box, you can still use most of these features. The accurate title for Tomcat would be either “web server” or “servlet container”. ![]() Indeed, Tomcat doesn’t implement all the features required of a Java EE application server. Also, there is a Web Profile subset of the full EE platform now available, as well as a servlet-only web container. Oracle has transferred Java EE to the Eclipse Foundation, and it is now called Jakarta EE after Java EE 8. As of today, Oracle lists three such containers, and Tomcat isn’t one of them. Therefore, strictly speaking, I should call only the containers that pass Java EE compatibility tests by the name application servers. A specification called Java EE precisely defines the functionality of application servers. Remember when I said that application servers provide some infrastructure and functional capabilities to your application? Well, this set of capabilities isn’t arbitrary. See, I’m calling it an application server when technically…it isn’t. However, there’s a bit of confusion (and even controversy) about Tomcat’s merit as an application server. Some sources claim Tomcat’s market share to be more than a whopping 60% of all Java application server deployments. Tomcat is the most popular application server used with Java web applications developed by the Apache Software Foundation. I click the "Test" button, and after about 30 seconds, SAM reports that "Test failed with "unknown" status on " and "Cannot connect to JMX server".Tomcat vs. Next, from within the SAM Application Monitor edit page, I highlight one of the Component Monitors (i.e. All other Component Monitor configuration values have been left at the template's defaults, except that I have also tried changing the Component Monitor's protocol from RMI to IIOP without success. Since for testing purposes I'm not using credentials, I set "Credential for Monitoring" to. Then, because I am using a non-default port for JMX, I edited the Component Monitors to change the port from the template's default to my domain's corresponding port, 6800. Inside SAM, I added the Glassfish Application Monitor to the appropriate host. It works flawlessly and I am able to see all the usual metrics for things like heap size, thread count, etc. authenticate=falseĪfter restarting the Glassfish domain, I tested that configuration by using jconsole to connect directly to the Glassfish server via JMX. I configured the following options within Glassfish as recommended in the Glassfish SAM guide ( ): Here are the steps I used to set the monitoring up: Can anyone suggest next steps for troubleshooting, or spot anything I might have overlooked? ![]() I'm trying to set up SAM to monitor a Glassfish (version 3.1.2.2 build 5) domain, but when I configure the Application Monitor with the details of the server I want to monitor and test the Component Monitor within SAM, it fails with the error "Cannot connect to JMX server".
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |