If the change in the level has to be set from INFO to DEBUG level then the output from the container-managed persistence engine has to be changed to the DEBUG level. A redirection takes place in separate files and a log is maintained with the name cmp.log to compare the files later on. The code that is written has to be added in the log4j.xml file.
Posted Date:- 2022-03-12 14:50:01
There are different components that need to be measured in an application. The primary step is to find out where exactly the degradation is, whether it is internal or external, where exactly the application is spending all the time.The usage of the JBoss JMX agents and monitoring of the components deployed to the application server represents the first step. Jbprobe, a specialized tool, is used for examining the single object or the objects loaded in the memory. This is possible after finding the time spent by most of the components or libraries or most of the resources.
Posted Date:- 2022-03-12 14:49:21
Domain Controller failure leads to problems in Domain configuration. If there is a failure in Domain Controller, it is not possible to perform the domain configuration management. One more plus is that though the domain controller fails, the single nodes' applications are preserved. It is also possible to choose a backup domain controller server using the below snippet code.
Posted Date:- 2022-03-12 14:48:55
The file that is created using the appender specifies the use of it as a logger for the package org.jboss.ejb.plugins.cmp. This makes it easy for the server to look at CMP and compare the two log files. The files are used to produce a new log file every day and don’t produce any file even there are changes made every time. The service has to be restarted and during the restart, there is no server file gets written or done. The older files consist of the dates that are written and added to the name of it. The log directory consists of HTTP request logs that are produced by the web container.
Posted Date:- 2022-03-12 14:48:28
A local-tx-data source identifies a data source that uses transactions, even distributed trans actions within the local application server, but doesn’t use distributed transactions among multiple application servers. A xa-data source, on the other hand, identifies a data source that uses distributed transactions among multiple application servers.
Posted Date:- 2022-03-12 14:48:11
An applet is a small server-side application that can be loaded and controlled on the browser by the client application. An applet has limited access to resources to ensure security.
Posted Date:- 2022-03-12 14:47:50
You can’t with a Servlet. A JTA transaction must start and finish within a single invocation (of the service() method). You should consider using a Stateful SB. In an SFSB with a JTA transaction, the association between the bean instance and the transaction is retained across multiple client calls.
Posted Date:- 2022-03-12 14:46:31
The services of the server are based on the type of files that are provided and kept by the server. The server provides the service from basic to advanced and they are classified as:
1. Core services: These are the services that provide scripts to start the server and provide the basic functionality of the start-up scripts.
2. Logging Service: These are the services that are used for logging on the server and using the configuration setting to modify and create it.
3. Security Service: These are the services that all the security domain information to be stored in the file login config.xml files and used to list the named security domain features. It specifies all the separate modules that are used for authentication purposes in the domain.
4. Additional Services: These are the services that are hot-deployable and directly deployed in the directory. They consist of XML descriptor files and other resource files.
Posted Date:- 2022-03-12 14:46:10
WAR – web application archive is a jar file used to distribute a collection of JavaServer Pages, Java Servlets, Java classes, xml files, tag libraries, static web pages (Html & others) and others resources that constitute a web application.
JAR – Java Archive, is an archive file format typically used to aggregate many Java class files and associated metadata and resources into one file to distribute application software, libs on the Java platform.
EAR – Enterprise Archive is used to package one or more models into a single archive so the deployment of the various modules into the app server happens simultaneously and coherently.
Posted Date:- 2022-03-12 14:45:28
JBossTS supports Web Services transactions, including extended transaction models designed specifically for loosely-coupled, long running business processes. J2EE transactions can integrate seamlessly with Web Services transactions using our integrated, bi-directional transaction bridge. Interoperability with many other vendors is provided out-of-the-box and JBoss is an active participant in these standards.
Posted Date:- 2022-03-12 14:45:08
You might consider using an attachment to transfer the information.JBoss JAX-WS Web services provide Attachment support with MTOM (Message Transmission Optimization Mechanism) SOAP.
Posted Date:- 2022-03-12 14:44:29
Java API for XML-Based RPC (JAX-RPC) is a Legacy Web Services Java API, it uses SOAP and HTTP to do RPCs over the network and enables building of Web services and Web applications based on the SOAP 1.1 specification, Java SE 1.4 or lower.JAX-WS 2.0 is the successor to JAX-RPC 1.1. JAX-WS still supports SOAP 1.1 over HTTP 1.1, so interoperability will not be affected. However there are lots of differences:
<> JAX-WS maps to Java 5.0 and relies on many of the features new in Java 5.0 like Web Service annotations.
<> JAX-RPC has its own data mapping model, JAX-WS’s data mapping model is JAXB. JAXB promises mappings for all XML schemas.
< >JAX-WS introduces message-oriented functionality, dynamic asynchronous functionality which are missing in JAX-RPC.
<> JAX-WS also add support, via JAXB, for MTOM, the new attachment specification.
Posted Date:- 2022-03-12 14:43:28
<> BPEL and BPM are quite different things so they cannot even be compared. The problems boils down to the fact that these years maybe BPEL has been marketed for something which isn’t: that is a Business Process Management framework.
<> BPEL is made up for service orchestration, that is publishing new services as a function of other services.
<> while BPM si needed for handling human task management functionalities and subprocess management.
Posted Date:- 2022-03-12 14:42:39
In my opinion one of the biggest obstacle in the movement towards SOA adoption is the organization own IT department.Too many people in the IT organization conceive SOA as a technology concept only, and as such think of SOA as just a set of technologies and infrastructure for exposing, securing, running, and managing Services.
Put it this way, SOA is nothing more than Web Services and standardized middleware. The critical flaw in thinking is confusing the technology that sits beneath the Services level of abstraction and the mechanism by which Services are accessed with the architectural approach that aims to decouple the implementation from the consumption and focus on sustainable architecture that allows for continuous change.
Successful SOA adoption requires a cultural shift in the way IT is done. The Service-oriented movement to agility and loose coupling demands a shift from traditional, waterfall styles of development (design-build-test-deploy-manage) to iterative approaches to continuous Service modeling
Posted Date:- 2022-03-12 14:41:42
Let us gain an understanding of both the terms.
Multiple domains in the same cluster: The multiple domains in the same cluster can be obtained by starting two domains in the same network sharing the same multicast address and port. This is technically possible and occurs very rarely.
Multiple domains in the same domain: The multiple clusters in the same domain can be obtained by defining a different multicast address on each Server Group or even at Server Level. This way, your Servers will communicate through different multicast addresses, even if in the same domain, so they will make up separate clusters.
Posted Date:- 2022-03-12 14:41:22
JBoss Cache is referred to as a product that helps in caching the frequently accessed java objects. JBoss Cache helps in improving the performance of business applications. JBoss provides its extensive support in improving the applications' scalability by minimizing the unnecessary database access and decreasing the network traffic. JBoss has come up with fully transactional features and a highly configurable set of actions that help deal with the concurrent data access efficiently for the applications.
Posted Date:- 2022-03-12 14:40:57
JBoss Cache is referred to as a product that helps in caching the frequently accessed java objects. JBoss Cache helps in improving the performance of business applications. JBoss provides its extensive support in improving the applications' scalability by minimizing the unnecessary database access and decreasing the network traffic. JBoss has come up with fully transactional features and a highly configurable set of actions that help deal with the concurrent data access efficiently for the applications.
Posted Date:- 2022-03-12 14:40:32
JBoss includes a JGroups Framework framework that provides its service to enable the peer-peer communications between the different nodes available in a cluster. This framework is built on the top of a stack of a network communication protocol. It provides services like transportation, discovery, reliability, failure detection, cluster management services, etc.
Posted Date:- 2022-03-12 14:36:39
Seam only works on JDK 5.0 and above. It uses annotations and other JDK 5.0 features.
Posted Date:- 2022-03-12 14:36:17
Seam runs beautifully on other application servers – just like everything else the Hibernate team does, this is not a JBoss-only thing.
Posted Date:- 2022-03-12 14:33:56
Yes, it is technically possible to put a JBoss server instance into multiple clusters simultaneously. This process is generally not recommended or suggested as it increases the complexity level of management.
Posted Date:- 2022-03-12 13:33:21
It is technically possible to put a JBoss server instance into multiple clusters at the same time, this practice is generally not recommended, as it increases the management complexity.
Posted Date:- 2022-03-12 13:31:45
The JGroups framework provides services to enable peer-to-peer communications between nodes in a cluster. It is built on top a stack of network communication protocols that provide transport, discovery, reliability and failure detection, and cluster membership management services.
Posted Date:- 2022-03-12 13:31:03
You could activate the “Commit Option A†that is the container caches entity bean state between transactions. This option assumes that the container has exclusive access to the persistent store and therefore it doesnt need to synchronize the in-memory bean state from the persistent store at the beginning of each transaction.
Posted Date:- 2022-03-12 13:30:17
Standalone mode: Standalone mode in JBoss is referred to as a single Java Virtual Machine process in which every JBoss server maintains its configuration. If you would like to use only one JVM or development environment, then the standalone mode is the best model to work on.
Domain mode: Domain mode includes multiple servers in the configuration management, is done in a centralized way, and is most commonly used in the production environment.
Posted Date:- 2022-03-12 13:29:28
A local-tx-datasource identifies a data source that uses transactions, even distributed trans actions within the local application server, but doesnt use distributed transactions among multiple application servers. An xa-datasource on the other hand identifies a data source that uses distributed transaction among multiple application servers.
Posted Date:- 2022-03-12 13:28:36
EJBs are now plain old Java objects (POJO) that expose regular business interfaces (POJI), and there is no requirement for home interfaces.
Use of metadata annotations, an extensible, metadata-driven, attribute-oriented framework that is used to generate Java code or XML deployment descriptors.
Removal of the requirement for specific interfaces and deployment descriptors (deployment descriptor information can be replaced by annotations).
Interceptor facility to invoke user methods at the invocation of business methods or at life cycle events.
Default values are used whenever possible.
Reduction in the requirements for usage of checked exception.
A complete new persistence model (based on the JPA standard), that supersedes EJB 2.x entity beans
Posted Date:- 2022-03-12 13:28:15
You can’t with a Servlet. A JTA transaction must start and finish within a single invocation (of the service() method). You should consider using a Stateful SB. In a SFSB with a JTA transaction, the association between the bean instance and the transaction is retained across multiple client calls.
Posted Date:- 2022-03-12 13:27:48
By default, the mod_cluster subsystem’s balancer uses multicast UDP to advertise its availability to the background workers.
Posted Date:- 2022-03-12 13:27:23
The perception of EJB3 as being a simple clone of Hibernate is primarily based on developer familiarity with Hibernate and SVR of naming, as well as common purpose, and that Hibernate is morphing itself into an EJB3 implementation based on the work going into the specification, not the other way around.
EJBs are supposed to be components, in the sense that they’re not just one class, but a set of classes, descriptors and usage, and management contracts. All of this to allow a container (JBoss,
Weblogic, etc.) to provide services to those components and to be able to reuse and distribute this component. These services are, among others, transactions, concurrent access control, security, instance pooling, etcetera.
Hibernate is “just†an ORM (Object/Relational Mapping) tool. Quick and dirty, this means you can store an object tree belonging to a class hierarchy in a relational DB without writing a single SQL query. Quite cool, IMO. But no transaction control, no instance pooling, no concurrency control, and certainly no security.
Posted Date:- 2022-03-12 13:26:44
JBoss registers in the JNDI tree a JTA UserTransaction Object which can be user to manage a distributed transaction.
Posted Date:- 2022-03-12 13:26:15
The Session interface wraps a JDBC Connection. This interface is a single threaded object which represents a single unit of work with application and persistent database. It’s retrieved by the SessionFactory’s openSession() method
Posted Date:- 2022-03-12 13:25:28
WildFly 10 and EAP 7 still support Session Beans and MDBs written using the 2.X specification. What is not supported anymore are CMP Entity Beans 2.X
Posted Date:- 2022-03-12 13:24:57
The perception of EJB3 as being a simple clone of Hibernate is primarily based on developer familiarity with Hibernate and a similarity of naming, as well as common purpose, and that Hibernate is morphing itself into an EJB3 implementation based on the work going into the specification, not the other way around.
EJBs are supposed to be components, in the sense that they’re not just one class, but a set of classes, descriptors and usage and management contracts. All of this in order to allow a container (JBoss, Weblogic, etc.) to provide services to those components, and to be able to reuse and distribute this components. This services are, among others, transactions, concurrent access control, security, instance pooling, etc.
Hibernate is “just†an ORM (Object/Relational Mapping) tool. Quick and dirty, this means you can store an object tree belonging to an class hierarchy in a relational DB without writing a single SQL query. Quite cool, IMO. But no transaction control, no instance pooling, no concurrency control, and certainly no security.
Posted Date:- 2022-03-12 13:24:36
JBoss installation is very straightforward. You need to download the desired version from the JBoss official download page in zipping or gz format.
Once downloaded, just extract the file to the location you want to install. If you downloaded the zip format, then you can use unzip command to extract it.
Posted Date:- 2022-03-12 13:24:01
JBoss clustering is on top of the JGroups toolkit which helps to create, delete, membership detection, notification, etc. in the cluster.
Posted Date:- 2022-03-12 13:23:41
Java Transaction API (JTA) specifies standard Java interfaces between a transaction manager and the parties involved in a distributed transaction system: the resource manager, the application server, and the transactional applications.
The Javaâ„¢ Transaction API (JTA) allows applications to perform distributed transactions, that is, transactions that access and update data on two or more networked computer resources.
The Java Transaction API consists of three elements: a high-level application transaction demarcation interface, a high-level transaction manager interface intended for an application server, and a standard Java mapping of the X/Open XA protocol intended for a transactional resource manager.
Posted Date:- 2022-03-12 13:23:20
Security Service consists of the domain information that is stored in the file in the login config.xml file and it has all the named security domains that specify the number of login modules that are used for authentication purposes in the domain. The security for the application can be used till it specifies the name of the domain to be used in specific JBoss deployment descriptors. The files that are to be considered are jboss.xml and JBoss-web.xml. This is used to secure the JMX console application that comes with the JBoss. Every aspect of the server is controlled through the JMX console. The applications are kept password protected and any remote user can completely control the server without having any detailed information.
Posted Date:- 2022-03-12 13:23:04
Different components of the application are to be measured. This step is to find where the degradation is, whether it is external or internal and where is the application spending all the time. Using Jboss JMX agents and monitoring the deployed components to the application server involves in the first step.
After finding the most of the time spent by specific components or libraries or most of the resources, one can use Jprobe a specialized tool for examining the single object or the objects loaded in the memory.
Posted Date:- 2022-03-12 13:22:48
JBoss cache is a product. Frequently accessed Java objects are cached by utilzing JBoss cache to improve the performance of e-business applications. JBoss decreases the network traffic and increases the scalability of applications by eliminating unnecessary database access. Fully transactional features and highly configurable set of options which are to deal with concurrent data access, are provided by JBoss cache in an efficient manner possible for the applications.
Posted Date:- 2022-03-12 13:22:15
JBossTS supports Web Services transactions, including extended transaction models designed specifically for loosely-coupled, long-running business processes. J2EE transactions can integrate seamlessly with Web Services transactions using our integrated, bi-directional transaction bridge. Interoperability with many other vendors is provided out-of-the-box and JBoss is an active participant in these standards.
Posted Date:- 2022-03-12 13:09:01
Heap Memory can be increased in a respective conf file. To increase memory for standalone;
Go to the bin folder
Edit the standalone.conf file and look for “JAVA_OPTS=†argument line
The default configuration will have a minimum of 64 MB and a maximum of 512 MB. You can increase to the desired value.
Xms – specify the minimum heap size
Xmx – specify the maximum heap size
Similarly, you can adjust the memory for a domain in the domain.conf file
Posted Date:- 2022-03-12 13:08:31
BPEL and BPM are quite different things so they cannot even be compared. The problems boil down to the fact that these years maybe BPEL has been marketed for something which isn’t: that is a Business Process Management framework.
BPEL is made up of service orchestration, which is publishing new services as a function of other services.
while BPM is needed for handling human task management functionalities and subprocess management.
Posted Date:- 2022-03-12 13:08:08
The core services are specified in the configuration files that are used by the JBoss. This file lies in the configuration folder. The file is called service.xml and it is the first file that starts when the server gets started. This file consists of the configuration MBeans for various services including logging, security, etc.
Posted Date:- 2022-03-12 13:07:40
validate the database connection every time, and if a connection is not valid, it will write a warning in the logs.
Having “validate-on-match†configured may have a little high load on the database as it may create lots of requests.
validate the connection periodically based on what frequency is configured for “background-validation-millisâ€. The default configuration is set to zero means disabled.
Having “ background-validation†set to true will create fewer database connections and its side-effects would be not detecting immediately if dead connections.
Posted Date:- 2022-03-12 13:07:09
Built on the standards Java Server Faces and EJB 3.0, JBoss Seam unifies component and programming models and delivers a consistent and powerful framework for the rapid creation of web applications with Java EE 5.0. Seam simplifies web application development and enables new functionality that was difficult to implement by hand before, such as stateful conversations, multi-window operation, and handling concurrent fine-grained AJAX requests. Seam also unifies and integrates popular open source technologies like Facelets, Hibernate, iText, and Lucene.
Posted Date:- 2022-03-12 13:06:49
JBoss JBPM is a workflow and BPM engine. Enabling the creation of business processes that coordinates between people, applications and services is the functionality of the BPM engine. The combination of workflow application development with process design is a feature of JBoss jBPM. The business process is graphically represented to facilitate a strong link between the business analyst and technical developer. This feature is provided by the JBoss jBPM process designer.
Posted Date:- 2022-03-12 13:06:29
The logging server allows the user to log into the server and save its logging details which might be used again. The package that is used for logging is log4j. The logging onto a server is controlled from a central file that resides in the configuration file that is managed separately. The file name I given as log4j.xml and this file defines a set of appending files that also considered as log files. The file follows a specific format that should go with the message and there is also a filtering option that is used to filter out the details that are not required. The output of this file gets to both the console and a log file that is also called a server log is given in the log directory. Logging services are very important to manage as it keeps the defined data on the server of people who are logging in.
Posted Date:- 2022-03-12 13:05:26
All admin console users and passwords (encrypted) are stored in mgmt.-user.properties file.
I hope above to give you an idea of what type of questions being asked in the Interview and wish you good luck.
Posted Date:- 2022-03-12 13:04:10
JBoss is a popular open source application server based on JEE technology. Being JEE based, the JBoss supports cross-platform java applications. It was embedded with the Apache Tomcat web server. It runs under any JVM of 1.3 or later versions. JBoss supports JNDI, Servlet/JSP (Tomcat or Jetty), EJB, JTS/JTA, JCA, JMS, Clustering (JavaGroups), Web Services (Axis), and IIOP integration (Jacob).
Posted Date:- 2022-03-12 13:03:24