Re: Using JMX to get ONLY running applications

[Amit Pande]

I managed to use jCOnsole and find Mbean names and attributes to get the 
stateName (STARTED/STOPPED) to see if a web app is available or NOT 
(j2eeType=WebModule).

However, I see the stateName of a web module as STARTED even if there are 
errors in start-up.

 SEVERE [localhost-startStop-3] 
org.apache.catalina.core.StandardContext.loadOnStartup Servlet [dispatcher] in 
web application [/testApp] threw load() exception

I still see state for testApp as "STARTED".

How can I accurately know if the application is started without any errors ?

Appreciate your help.

Thanks,
Amit

From: Amit Pande <amit.pa...@veritas.com<mailto:amit.pa...@veritas.com>>
Date: Tuesday, 12 July 2016 9:56 pm
To: "users@tomcat.apache.org<mailto:users@tomcat.apache.org>" 
<users@tomcat.apache.org<mailto:users@tomcat.apache.org>>, 
"users-h...@tomcat.apache.org<mailto:users-h...@tomcat.apache.org>" 
<users-h...@tomcat.apache.org<mailto:users-h...@tomcat.apache.org>>
Subject: Using JMX to get ONLY running applications

Hello all,

I see there are JMX APIs to get the web applications currently deployed in 
Tomcat.

However, I see that even if the applications are failed to deploy, they still 
get listed. Is there any way to get ONLY deployed and RUNNING applications ?

Below is sample snippet which gives all the currently deployed apps ..even if 
there are some apps which had errors and thus failed to deploy:


public List<String> collectAllDeployedApps() throws 
MalformedObjectNameException, AttributeNotFoundException, 
InstanceNotFoundException, MBeanException, ReflectionException {
List<String> webappNames = new ArrayList<>();
List<MBeanServer> servers =  MBeanServerFactory.findMBeanServer(null);
for (MBeanServer server : servers ) {
Set<ObjectName> names = server.queryNames(new 
ObjectName("Catalina:type=Host,*"), null);
Set<String> hostNames = new HashSet<String>();
for (ObjectName on : names) {
hostNames.add(on.getKeyProperty("host"));
}
for (String str : hostNames) {
ObjectName[] webapps = (ObjectName[]) server
.getAttribute(new ObjectName("Catalina:type=Host,host=" + str), "children");
for (ObjectName ob : webapps) {
String[] appSpl = ob.getKeyProperty("name").split("//localhost");
System.out.println(ob.getKeyPropertyList());
webappNames.add(appSpl[1]);
}
}
}
return webappNames;
}
}