Interview Questions.

Q1. What Is Managed Bean Or Mbean?

A managed bean - once in a while truely referred to as an MBean - is a kind of JavaBean, created with dependency injection. Managed Be are specifically used inside the Java Management Extensions era. But, with the Java EE 6 specification offers for a greater detailed which means of a managed bean.

Q2. What Is Jmx?

JMX is native to the Java programming language. As a result, it offers herbal, green, and light-weight control extensions to Java-primarily based capabilities. It consists of a set of specifications and improvement tools for dealing with Java environments and developing cutting-edge management answers for packages and services.

Q3. What Is A Nested Bean?

Scopes the bean in the bean that uses it. One less bean identity in the set of bean names.

Q4. How Is Dependency Injection Performed In The Bean-record Xml?

There are nested elements inside every bean definition.

Q5. What Is Dependency Injection?

A pattern (layout) whereby collaborators are passed into an object from the out of doors - the object does no longer allocate them for itself.

Q6. What Is An Advice In Jmx?

The code that implements the pass cutting-problem on the way to be inserted at every join-point.

Q7. List 2 Examples Of Anonymous Bean?

Two examples:

Nested or inner be

Configuration be

Q8. Why Is Dependency Injection Useful?

Different collaborators for one of a kind environments can be injected - check, production, check-database, real database. This permits training to be examined impartial of its collaborators (makes it clean to bypass in stub or mock objects).

Q9. How To Access Jmx (java Be) From A Process Running In Docker Container?

You have to expose the JMX port to the host or even used Sun particular alternatives while running the Java procedure.

You are able to telnet to the host ip and the uncovered JMX port, which tells that it is on hand. But I can not figure out a manner to use JConsole and connect to the JMX provider walking inside the box.

Djava.Rmi.Server.Hostname=$JMX_HOSTNAME

Dcom.Solar.Control.Jmxremote.Port=$JMX_PORT

Dcom.Sun.Control.Jmxremote.Rmi.Port=$JMX_PORT

Q10. Which Is The Best Tool For Monitoring Weblogic Server(wls8)?

WLS8 helps JMX however it uses weblogic implementation of JMX server. It does not supports generalise solar javax API which may be used with any JVM. There are a few patches available which can be used with WLS8 if you want to enabled JMX based totally tracking. Once JMX is permit there are numerous tracking gear to be had inside the marketplace. One may even go for custom JMX utilities which may be used for server tracking.

Q11. What Are The five Scopes Defined In Spring?

5 scopes described in Spring:

Singleton

Prototype

Session - handiest valid in a Web utility context

Request - ditto

Custom

Q12. What Is Lazy Initialization?

Bean isn't allocated till it's far sincerely wanted - dependency injected - or asked thru getBean(). Specify lazy="proper" (false by using default). Only beneficial if bean definitely may additionally never be utilized in most runs of the software.

Q13. List Some Types Of Advice?

Types of recommendation:

Before

AfterReturning

AfterThrowing

After

Around

Q14. What Is A Named Pointcut And Why To Use One?

A point cut expression that has a call so it can be reused.

Resons To use:

Annotation: @Pointcut applied to a dummy approach - call of the dummy approach is the name of the pointcut expression.

XML aop:pointcut identity=".." expression=".."

Q15. What Is Jmx Architecture?

JMX is primarily based on a 3-degree structure:

The Probe stage carries the probes (known as MBe) instrumenting the assets. Also referred to as the Instrumentation level.

The Agent stage, or MBeanServer, is the middle of JMX. It is an intermediary between the MBean and the packages.

The Remote Management level permits remote programs to access the MBeanServer via Connectors and Adaptors. A connector affords full far flung get admission to to the MBeanServer API the usage of diverse conversation frameworks (RMI, IIOP, JMS, WS), at the same time as an adaptor adapts the API to any other protocol (SNMP) or to Web-primarily based GUI (HTML/HTTP, WML/HTTP).

Q16. Explain Jmx Concepts And Architecture?

JMX is conceptually easy, yet bears the fruit of years of area revel in and studies. In a nutshell, JMX defines a trendy me for applications to expose control functionality 

Instrumentation degree 

Agent level 

Management stage

Q17. How Will You Check If Jmx Agent Is Working In Tomcat?

When Tomcat is strolling as a service on Windows, you do no longer want setenv.Bat, you need to apply tomcat8w.Exe and GUI toll for adding alternatives.

Q18. What Is The Advantage Of Constructor Dependency Injection?

Here are some advantages:

Constructor

Mandatory

Mutable

Natural Java technique.

Q19. What Is A Join-point?

Joint-factor is an expression that defines zero or greater join-factors.

Q20. How To Run Jmx Java Application In Udeploy Process?

Copy WLHOME/wlserver_**/server/lib/wlfullclient.Jar report into agent domestic/choose/groovy-1.8.Eight/lib Then the Groovy script (that migrated from my JMX Java software) works.

Q21. What Are The Various Actions Performed When An Application Context Is Created?

Here are 5 steps:

Read bean report XML (or manner annotations). Build inner "map" of be and decide dependency tree.

Post technique the definitions - e.G. Resolve $variables

Allocate items - dependency inject constructor args and invoke setter.

Perform any initialisation - 3 approachs: @PostConstruct, init-technique, InitializingBean

Bean put up-processors - e.G. Wrap with proxy, @Required

Q22. How Is The Application Jvm Configured?

The utility JVM is configured with the subsequent alternatives:

com.Solar.Management.Jmxremote

com.Sun.Control.Jmxremote.Port=1088

com.Solar.Management.Jmxremote.Authenticate=fake

com.Solar.Control.Jmxremote.Ssl=false

Q23. What Is A Cross-reducing Concern?

A requirement that cuts across all of the natural modules of your utility.

Examples:

Tracing, protection, tractions, business regulations.

Two issues with cross-cutting issues.

Code tangling - approach doing too many unrelated obligations

Code scattering - code duplication leading to renovation headache

Q24. What Is The Use Of Object Factories?

Factory techniques in an effort to be used to create items just like in a static manner.

Q25. How Does A Spring Factory Bean Work?

It is created by using Spring mechanically, any setters are known as on the manufacturing facility then its getObject() approach is referred to as to allocate the actual bean.

Q26. How Is Setter Dependency Injection Specified A Configuration File?

<constructor-arg… and <belongings…

Q27. What Are The Advantages Of Setter Dependency Injection?

Here are some advantages of Setter:

Natural for Java Be

Avoids overly long constructors

Can be inherited

Easier to recognize in that properties have names

Constructor args do not have names

Q28. What If There Is No Jmx Data?

No JMX-related output within the logs. I can connect with the JVM with jconsole using the furnished credentials, browse to the configured mbean, jackhammer the Refresh button and get new values. Splunk, however, gets nothing, and leaves no indication as to why. Searching for "host=redacted" or "supply='jmx://redacted'" yields not anything.

This isn't always a complicated setup, nor is it a complex app. Single server test surroundings, simply seeking to get JMX records into Splunk directly alternatively of getting to perform a little nasty seek-time field extraction after indexing facts output from JMXTr textual content files. It's presently walking on JDK 1.7, I tried 1.6 for science to no avail.

Q29. How To Connect To Multiple Jmx Instances Using Splunk For Jmx?

Install Splunk 6 on your server which incorporates about 6 different JMX times. You want to hook all of them up into our Splunk JMX plugin.

It is as clean as modifying the config.Xml record and adding a new jmx server host? Currently this is:

<jmxserver host="[[system name]]" jvmDescription="common_raw" jmxport="53632">