![\"\"](\"https:\/\/cloudfoundation.com\/blog\/wp-content\/uploads\/2023\/12\/EJB-Interview-Questions-1.jpg\")
<\/strong><\/p>\n1. What is an Enterprise Java Bean (EJB)?<\/strong> 2. How are staple beans created, and what are they used for?<\/strong><\/p>\n Staple beans are created every time a JDI lookup or dependency injection is performed.<\/p>\n They ensure that the same bean instance is provided throughout the application.<\/p>\n 3. How are Singleton beans generally created, and what loading strategies can the container adopt?<\/strong><\/p>\n Singleton beans are generally created by the container at application load.<\/p>\n The container can adopt an eager or lazy load strategy for singleton beans.<\/p>\n 4. What happens when the container destroys a bean, and why is this process necessary?<\/strong><\/p>\n When a bean is destroyed, the container will create a new instance from scratch.<\/p>\n This is important because developers should clean up after themselves, even though there is a garbage collection mechanism behind the scenes.<\/p>\n 5. How do stateless and stateful beans differ regarding lifecycle and mapping?<\/strong><\/p>\n Stateless beans do not maintain a state between method calls and are shared across multiple sites.<\/p>\n Stateful beans maintain a condition between method calls and always have a one-to-one mapping, with one bean per instance.<\/p>\n 6. What are the two primary lifecycle transitions a stateful bean goes through, and why are they important?<\/strong><\/p>\n A stateful bean goes through two primary lifecycle transitions: post-construct and destroy.<\/p>\n They are essential because they allow the bean to perform necessary actions before and after executing the business methods.<\/p>\n 7. When is the post-construct method invoked in the lifecycle of a stateful bean, and why is it important?<\/strong><\/p>\n The post-construct method is invoked after the constructor completes, assuming no exceptions were generated.<\/p>\n It is essential because it allows the bean to perform necessary actions before executing business methods, such as initialising resources and dependencies.<\/p>\n 8. What is the purpose of the specific method created in the EJB2.x world?<\/strong><\/p>\n The specific method created in the EJB2.x world was to implement a naming convention starting with the three letters EJB, all lowercase letters and then the fourth letter uppercase.<\/p>\n However, this made the model brittle as there was no interface to implement for compile-time checks physically.<\/p>\n 9. What is the purpose of the idea in EJB3.0?<\/strong><\/p>\n The idea in EJB3.0 was to move everything to annotations or as much as possible to annotations.<\/p>\n Method signatures could be public, private, or protected.<\/p>\n 10. What is the purpose of creating a public method?<\/strong><\/p>\n Creating a public method is a dual-purpose method.<\/p>\n The container can use the method as a callback and perform business operations.<\/p>\n For example, the singleton beam has two methods that function as lifecycle callbacks.<\/p>\n 11. What are the names of the two methods that function as lifecycle callbacks in the singleton beam?<\/strong><\/p>\n The two methods that function as lifecycle callbacks in the singleton beam are Post-construct.<\/strong><\/p>\n 12. What is the access modifier of these two methods?<\/strong><\/p>\n The access modifier of these two methods is denoted as private.<\/p>\n 13. What is the purpose of the pre-destroy annotation?<\/strong><\/p>\n The container notifies the shaft before an application is unloaded through the destroy annotation.<\/p>\n It is essential to ensure the code is robust enough not to throw an exception, as having both would make no sense.<\/p>\n Instead, define a local interface and tag an interface with local when implementing the bean.<\/p>\n Some inheriting, some remote, some local, all inherit the same interface.<\/p>\n 14. What is the purpose of defining a local interface and tagging an interface with local when implementing the bean?<\/strong><\/p>\n Defining a local interface and tagging an interface with local when implementing the bean is essential to ensure the code is robust enough not to throw an exception.<\/p>\n This approach allows developers to define a set of methods the bean must implement, providing consistency across all beans that implement the same interface.<\/p>\n 15. What is the purpose of the lifecycle in EJB beans?<\/strong><\/p>\n The lifecycle in EJB beans involves understanding how a bean transitions from its existence through the destruction phase and how developers can get notifications from the container as it goes through those transitions.<\/p>\n 16. What are the three types of beans in the EJB world?<\/strong><\/p>\n The three types of beans in the EJB world are stateless, stateful, and singleton.<\/p>\n 17. What is the difference between an eager and lazy load strategy for singleton beans?<\/strong><\/p>\n An eager load strategy creates the singletons directly on application initialisation, while a lazy load strategy determines when to build the singleton based on run time.[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_3,1_3,1_3″ _builder_version=”4.9.7″ _module_preset=”default” background_color=”#064399″ use_background_color_gradient=”on” background_color_gradient_start=”#0095f2″ background_color_gradient_end=”#7dbed8″ background_color_gradient_direction=”92deg” background_color_gradient_start_position=”35%” background_color_gradient_end_position=”80%” transform_scale=”73%|62%” transform_scale_linked=”off” transform_translate=”-53px|-50px” transform_translate_linked=”off” link_option_url=”https:\/\/cloudfoundation.com\/blog\/interview-questions\/” link_option_url_new_window=”on”][et_pb_column type=”1_3″ _builder_version=”4.9.7″ _module_preset=”default”][et_pb_image src=”https:\/\/cloudfoundation.com\/blog\/wp-content\/uploads\/2023\/06\/SS_436-_Converted_-1.png” _builder_version=”4.9.7″ _module_preset=”default” transform_scale=”114%|112%” transform_scale_linked=”off” transform_translate=”25px|-4px” transform_translate_linked=”off” width=”98.1%” custom_margin=”|7px|||false|false” hover_enabled=”0″ sticky_enabled=”0″][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_3″ _builder_version=”4.9.7″ _module_preset=”default”][et_pb_text _builder_version=”4.9.7″ _module_preset=”default” text_font=”Georgia|700|||||||” text_font_size=”23px” text_line_height=”1.3em” header_font=”Georgia|700|||||||” header_font_size=”21px” header_letter_spacing=”-1px” header_line_height=”2em” transform_scale=”171%|159%” transform_scale_linked=”off” transform_translate=”40px|44px” transform_translate_linked=”off” transform_origin=”70%|50%” z_index=”-161″ width=”100%” custom_margin=”|-215px||||” custom_padding=”|0px||||” link_option_url=”https:\/\/cloudfoundation.com\/sap-analytics-cloud-training\/”]<\/p>\n [\/et_pb_text][et_pb_button button_url=”https:\/\/cloudfoundation.com\/blog\/interview-questions\/” url_new_window=”on” button_text=”Explore Course Content” _builder_version=”4.9.7″ _module_preset=”default” custom_button=”on” button_text_color=”#0C71C3″ button_bg_color=”#FFFFFF” button_font=”|700|||||||” transform_translate=”64px|65px” transform_translate_linked=”off”][\/et_pb_button][\/et_pb_column][et_pb_column type=”1_3″ _builder_version=”4.9.7″ _module_preset=”default”][et_pb_image src=”https:\/\/cloudfoundation.com\/blog\/wp-content\/uploads\/2019\/06\/logo_resize_color.png” _builder_version=”4.9.7″ _module_preset=”default” transform_translate=”-36px|0px” transform_translate_linked=”off” custom_margin=”|||178px||” hover_enabled=”0″ sticky_enabled=”0″][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.9.7″ _module_preset=”default” custom_padding=”|||2px||”][et_pb_column type=”4_4″ _builder_version=”4.9.7″ _module_preset=”default”][et_pb_text _builder_version=”4.9.7″ text_font=”Georgia|300|||||||” text_text_color=”rgba(0,0,0,0.8)” text_font_size=”22px” text_line_height=”1.9em” header_font=”Georgia||||||||” header_font_size=”22px” header_line_height=”1.9em” max_width=”800px” max_width_last_edited=”off|phone” custom_margin=”|||10%” custom_margin_last_edited=”off|desktop” text_font_size_tablet=”” text_font_size_phone=”” text_font_size_last_edited=”on|phone” text_line_height_last_edited=”off|phone”]18. What should developers do during the initialisation process before demolition?<\/strong><\/p>\n Developers should de-initialize their initialisations during the initialisation process before demolition.<\/p>\n 19. What are the two primary lifecycle transitions for the stateless bean?<\/strong><\/p>\n The two primary lifecycle transitions for the stateless bean are post-construct and destroy.<\/p>\n 20. What is the purpose of the destroy method in the stateless bean?<\/strong><\/p>\n The destroy method is invoked before the object is destroyed or the finalised plan is executed.<\/p>\n 21. What is the purpose of the pre-passivate and step methods in the stateless bean?<\/strong><\/p>\n The steps methods are used to support load by reusing things.<\/p>\n 22. How can developers physically tell the container when to remove an instance of a stateless bean?<\/strong><\/p>\n Developers can physically tell the container when to remove an instance of a stateless bean by annotating a method with the remove annotation.<\/p>\n 23. What are the three types of state charts in the EJB world?<\/strong><\/p>\n The EJB world’s three types of state charts are stateful, stateless, and singleton.<\/p>\n 24. What was the issue with the naming convention used in the EJB2.x world?<\/strong><\/p>\n In the EJB2.x world, a specific method was created with a naming convention that started with the three letters EJB, all lowercase, and then the fourth letter uppercase.<\/p>\n However, this made the model brittle as there was no interface to implement for compile-time checks physically.<\/p>\n 25. How was the idea implemented in EJB3.0?<\/strong><\/p>\n In EJB3.0, the idea was to move everything to annotations or as much as possible.<\/p>\n This allowed for using any method signature and name, whether public, private, or protected.<\/p>\n 26. What is the purpose of the post-construct method in the singleton bean?<\/strong><\/p>\n The post-construct method creates an instance variable, and calls add through the divide.<\/p>\n 27. What is the purpose of the destroy method in the singleton bean?<\/strong><\/p>\n The destroy method is invoked before the application is unloaded.<\/p>\n 28. What is the purpose of stacking multiple annotations?<\/strong><\/p>\n Stacking multiple annotations allows for adding various lifecycle callback annotations to a single method without requiring a one-to-one relationship.<\/p>\n 29. What are message-driven beans?<\/strong><\/p>\n Message-driven beans are used to create reusable workflows in programming.<\/p>\n 30. How are EJB Stateless Beans managed and shared across multiple sites?<\/strong><\/p>\n EJB Stateless beans are shared across multiple sites, and the container will create a stateless bean if it doesn’t exist.<\/p>\n The container may create a secondary bean if threaded access is an issue.<\/p>\n 31. How do business rules fit into an n-layer architecture?<\/strong><\/p>\n Business rules are implemented in the orange layer of an n-layer architecture, which is responsible for handling and executing business logic or rules.<\/p>\n 32. What are design-by-contract technologies?<\/strong><\/p>\n Design-by-contract technologies are used in the orange layer of an n-layer architecture to execute business logic or rules.<\/p>\n They involve using interfaces to define the behaviour of the business logic.<\/p>\n 33. What is a business object?<\/strong><\/p>\n A business object is a Java Bean with properties and methods, such as adding an item to a cart or discussing the capacity and price of the cart, and is used in the business area.<\/p>\n 34. How do Java Beans help businesses handle and execute business logic and rules?<\/strong><\/p>\n Java Beans helps businesses handle and execute business logic and rules by incorporating design-by-contract technologies and interfaces, which create a consistent decision-making process and adhere to legal requirements and capacities.[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_3,1_3,1_3″ _builder_version=”4.9.7″ _module_preset=”default” background_color=”#064399″ use_background_color_gradient=”on” background_color_gradient_start=”#ff8c7c” background_color_gradient_end=”#e5ba4e” background_color_gradient_type=”radial” background_color_gradient_direction_radial=”top left” background_color_gradient_start_position=”35%” background_color_gradient_end_position=”80%” transform_scale=”74%|69%” transform_scale_linked=”off” transform_translate=”-53px|-50px” transform_translate_linked=”off” custom_margin=”||-5px||false|false” custom_padding=”|||2px|false|false” link_option_url=”https:\/\/cloudfoundation.com\/blog\/interview-questions\/” link_option_url_new_window=”on”][et_pb_column type=”1_3″ _builder_version=”4.9.7″ _module_preset=”default”][et_pb_image src=”https:\/\/cloudfoundation.com\/blog\/wp-content\/uploads\/2023\/06\/8423118_3895895.png” _builder_version=”4.9.7″ _module_preset=”default” width=”85.4%” custom_margin=”-31px||-24px||false|false” custom_padding=”|22px|0px||false|false” hover_enabled=”0″ sticky_enabled=”0″][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_3″ _builder_version=”4.9.7″ _module_preset=”default”][et_pb_text _builder_version=”4.9.7″ _module_preset=”default” text_font=”Georgia|700|||||||” text_font_size=”23px” text_line_height=”1.3em” header_font=”Georgia|700|||||||” header_font_size=”19px” header_letter_spacing=”-1px” header_line_height=”1.2em” transform_scale=”171%|159%” transform_scale_linked=”off” transform_translate=”40px|44px” transform_translate_linked=”off” transform_origin=”70%|50%” z_index=”-161″ width=”100%” min_height=”26.8px” custom_margin=”|-215px||||” custom_padding=”|0px||||” link_option_url=”https:\/\/cloudfoundation.com\/sap-analytics-cloud-training\/”]<\/p>\n [\/et_pb_text][et_pb_button button_url=”https:\/\/cloudfoundation.com\/blog\/interview-questions\/” url_new_window=”on” button_text=”Up Coming Batches” _builder_version=”4.9.7″ _module_preset=”default” custom_button=”on” button_text_color=”#E09900″ button_bg_color=”#FFFFFF” button_font=”|700|||||||” transform_translate=”64px|65px” transform_translate_linked=”off” background_layout=”dark”][\/et_pb_button][\/et_pb_column][et_pb_column type=”1_3″ _builder_version=”4.9.7″ _module_preset=”default”][et_pb_image src=”https:\/\/cloudfoundation.com\/blog\/wp-content\/uploads\/2019\/06\/logo_resize_color.png” _builder_version=”4.9.7″ _module_preset=”default” transform_translate=”-36px|0px” transform_translate_linked=”off” custom_margin=”|||178px||” hover_enabled=”0″ sticky_enabled=”0″][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.9.7″ _module_preset=”default”][et_pb_column type=”4_4″ _builder_version=”4.9.7″ _module_preset=”default”][et_pb_text _builder_version=”4.9.7″ text_font=”Georgia|300|||||||” text_text_color=”rgba(0,0,0,0.8)” text_font_size=”22px” text_line_height=”1.9em” header_font=”Georgia||||||||” header_font_size=”22px” header_line_height=”1.9em” max_width=”800px” max_width_last_edited=”off|phone” custom_margin=”|||10%” custom_margin_last_edited=”off|desktop” hover_enabled=”0″ text_font_size_tablet=”” text_font_size_phone=”” text_font_size_last_edited=”on|phone” text_line_height_last_edited=”off|phone” sticky_enabled=”0″]<\/p>\n 35. What is the Enterprise Java Bean’s EJBs Purpose? <\/strong><\/p>\n The EJB is the business logic of an application, which fulfils the purpose of the application and does not perform any data display or direct communication with the database.<\/p>\n 36. What is the role of the container in an EJB?<\/strong><\/p>\n The container is responsible for registering the object, providing remote interfaces, creating and destroying it as necessary, checking for security, and managing its state.<\/p>\n 37. Which role of interfaces in Java?<\/strong><\/p>\n Interfaces work in Java by providing a list of properties and methodsan object must implement.<\/p>\n 38. What is the difference between a stateful, entity, and message-driven EJB?<\/strong><\/p>\n Stateful beans maintain the state or information about the client across multiple requests, and entity beans represent the state of an object.<\/p>\n They can be persisted in a database, and message-driven beans are triggered by messages and perform specific tasks.<\/p>\n Let us get into the important Multiple-choice questions on this platform!!!<\/strong><\/p>\n 1. What happens when the EJB Stateless beans are shared across multiple sites?<\/strong><\/p>\n Creates a new stateless bean every time it is accessed\u2714\ufe0f<\/strong><\/em> 2. What happens to Staple beans?<\/strong><\/p>\n They are created every time a JDI lookup or dependency injection is performed \u2714\ufe0f<\/strong><\/em> 3. What does EJB stand for?<\/strong><\/p>\n Enterprise Java Bean \u2714\ufe0f<\/strong><\/em> 4. What is an Enterprise Java Bean?<\/strong><\/p>\n A means of dividing EJB components into categories 5. What is the only bean that goes through all five life cycle transitions?<\/strong><\/p>\n Stateless 6. When is the post-construct method invoked?<\/strong><\/p>\n After the constructor completes \u2714\ufe0f<\/strong><\/em> 7. Where is Enterprise Java Bean commonly used?<\/strong><\/p>\n In web applications 8. Which of the following is an example of an Enterprise Java Bean?<\/strong><\/p>\n JSP 9. What is the purpose of Enterprise Java Bean?<\/strong><\/p>\n To create, retrieve, update, and delete records in a database 10. What is the purpose of the access modifier denoted as private in the text?<\/strong><\/p>\n Make the methods visible to the caller The EJB Interview Questions blog offers an all-inclusive solution to successful discussions focusing on EJB containers, enterprise beans and component-based design.<\/p>\n Java developers building corporate apps must understand these ideas to use EJB effectively, as this knowledge will assist with developing large-scale, distributed applications with scalability features.<\/p>\n Our interview questions for EJB may help you learn this technology and navigate obstacles when developing such large apps.<\/p>\n Thanks again, and have a fantastic day!!!!!<\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_3,1_3,1_3″ _builder_version=”4.9.7″ _module_preset=”default” background_color=”#064399″ use_background_color_gradient=”on” background_color_gradient_start=”#494fff” background_color_gradient_end=”#9ea6ff” 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text_font=”Georgia|700|||||||” text_text_color=”#FFFFFF” text_font_size=”23px” text_line_height=”1.3em” header_font=”Georgia|700|||||||” header_font_size=”19px” header_letter_spacing=”-1px” header_line_height=”1.2em” transform_scale=”171%|159%” transform_scale_linked=”off” transform_translate=”40px|44px” transform_translate_linked=”off” transform_origin=”70%|50%” z_index=”-161″ width=”100%” custom_margin=”|-215px||||” custom_padding=”|0px||||” link_option_url=”https:\/\/cloudfoundation.com\/sap-analytics-cloud-training\/”]<\/p>\n [\/et_pb_text][et_pb_button button_url=”https:\/\/cloudfoundation.com\/blog\/interview-questions\/” url_new_window=”on” button_text=”Offer Price” _builder_version=”4.9.7″ _module_preset=”default” custom_button=”on” button_text_color=”#0C71C3″ button_bg_color=”#FFFFFF” button_font=”|700|||||||” transform_translate=”64px|65px” transform_translate_linked=”off”][\/et_pb_button][\/et_pb_column][et_pb_column type=”1_3″ _builder_version=”4.9.7″ 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header_font=”Georgia||||||||” header_font_size=”22px” header_line_height=”1.9em” max_width=”800px” max_width_last_edited=”off|phone” custom_margin=”|||10%” custom_margin_last_edited=”off|desktop” hover_enabled=”0″ text_font_size_tablet=”” text_font_size_phone=”” text_font_size_last_edited=”on|phone” text_line_height_last_edited=”off|phone” sticky_enabled=”0″]Enterprise Java Beans (EJBs) Interview Questions […]<\/p>\n","protected":false},"author":7,"featured_media":76085,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"2880","footnotes":""},"categories":[84],"tags":[],"class_list":{"0":"post-75830","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-interview-questions"},"yoast_head":"\n
\nAn EJB is an Enterprise Java Bean that handles business logic and data transformation.<\/p>\nEJB Training<\/span><\/h1>\n
EJB Online Training<\/span><\/h1>\n
\nReuses an existing stateless bean
\nCreates a secondary stateless bean if it can’t reuse the pre-existing bean
\nDestroys the stateless bean after it is accessed<\/p>\n
\nEnded after they are created
\nThey go through post-construct and destroy lifecycle transitions
\nThe container reuses them<\/p>\n
\nEnterprise Java Book
\nEnterprise Java Basic
\nEnterprise Java Byte<\/p>\n
\nA type of EJB that maintains the state for one client
\nA component used in enterprise applications \u2714\ufe0f<\/strong><\/em>
\nA type of EJB that does not maintain a conversational state with the client<\/p>\n
\nStaple
\nSingleton
\nStateful \u2714\ufe0f<\/strong><\/em><\/p>\n
\nAfter the bean is destroyed
\nBefore the constructor is called
\nAfter the business methods are executed<\/p>\n
\nIn desktop applications
\nIn enterprise applications \u2714\ufe0f<\/strong><\/em>
\nIn mobile applications<\/p>\n![\"\"](\"https:\/\/cloudfoundation.com\/blog\/wp-content\/uploads\/2023\/12\/EJB-Interview-Questions.jpg\")
<\/p>\n
\nServlet
\nEntity Bean
\nJDBC \u2714\ufe0f<\/strong><\/em><\/p>\n
\nTo maintain the state or information about the client across multiple requests
\nTo represent a single database table
\nTo encapsulate the business logic of an application \u2714\ufe0f<\/strong><\/em><\/p>\n
\nAllow the container to perform business operations on the methods
\nTo make the methods hidden from the caller but still available to the container \u2714\ufe0f<\/strong><\/em>
\nPrevent the methods from being called by the container<\/p>\nEJB Course Price<\/strong><\/span><\/h1>\n
\u201cLet\u2019s dive into the world of tech imagination with me!\u201d<\/h5>\n