Cor Client Acknowledgement: Fill & Download for Free

CORS is the abbreviation for Cross-Origin Resource Sharing. It means sharing resources across different origins (domains). The resources could be images, files or even APIs.Whenever you need to send a request from your domain to any different domain, the server on the other side needs to acknowledge your domain and serve that request. This is achieved by the CORS.This behaviour is not enabled on the server by default due to security concerns. So, you need to enable CORS in your web application so that the clients from different domains are able to access your web application’s resources.Hope this helps !!

Below are some important Spring microservices-based questions:1. What Is Spring Cloud?Probably, the first microservices interview question that you may encounter. Spring Cloud in Microservices, is a system that provides integration with external systems. It is a short-lived framework that builds an application in a fast manner. Being associated with the finite amount of data processing, it plays a very important role in Microservice architecture.For typical use cases, Spring cloud provides some out of the box experience and a set of extensive features mentioned-below:Versioned and distributed configurationDiscovery of the service registrationService to service callsRoutingCircuit breakers and load balancingCluster state and leadership electionGlobal locks and distributed messaging2. What Is Spring Boot?Spring boot is a major topic under the umbrella of microservices interview questions.With the new functionalities that have been added, Spring got more complex. Whenever you are starting a new project it is mandatory to add a new build path or Maven dependencies. In short, you will need to do everything from scratch. Spring Boot is the solution that will help you to avoid all the code configurations. Explaining by a real-time example is better while answering this common microservices interview question. If you are cooking a dish, the ingredients can be considered to be Spring. While Spring Boot is the completely cooked recipe.3. How Do You Override A Spring Boot Project’s Default Properties?This can be done by specifying the properties in application.properties.For example – In Spring MVC applications, you have to specify the suffix and prefix. This can be done by entering the properties mentioned below in application.properties.For suffix – spring.mvc.view.suffix: .jspFor prefix – spring.mvc.view.prefix: /WEB-INF/4. Role Of Actuator In Spring BootIt is one of the most important features, which helps you to access the current state of an application that is running in a production environment. There are multiple metrics that can be used to check the current state. They also provide endpoints of restful web services which can be simply used to check the different metrics.5. How Is Spring Security Implemented In A Spring Boot Application?Minimal configuration is needed for implementation. All you need to do is, add spring-boot-starter-security starter in the file pom.xml. You will also need to create a Spring config class that will override the required method while extending the WebSecurityConfigurerAdapter to achieve security in the application.6. Which Embedded Containers Are Supported By Spring Boot?Whenever you are creating a Java Application, deployment can be done by 2 methods:By using an application container that is externalYou can also embed the container inside your jar file.Spring Boot contains Jetty, Tomcat and undertow servers, all of which are embedded.Jetty – used in a wide number of projects, Eclipse Jetty can be embedded in frameworks and application servers, tools as well as clusters.Tomcat – Apache Tomcat is an open-source JavaServer pages implementation that works well with embedded systems.Undertow – A flexible and prominent web server that uses small single handlers to develop a web server.7: What are the different Microservices Design Patterns?The different Microservices Design Patterns are -Aggregator Microservice Design PatternAPI Gateway Design PatternChain of Responsibility Design PatternBranch Microservice Design PatternCircuit Breaker Design PatternAsynchronous Messaging Design Pattern8. What Is Semantic Monitoring?It combines monitoring of the entire application along with automated tests. The primary benefit of Semantic Monitoring is to find out the factors which are more profitable to your business.Semantic monitoring along with service layer monitoring approaches monitoring of microservices from a business point of view. Once an issue is detected, they allow faster isolation and bug triaging, thereby reducing the main time required to repair. It triages the service layer and transaction to figure out the transactions affected by availability or poor performance.9. How Can You Set Up Service Discovery?There are multiple ways to set up service discovery. I’ll choose the one that I think to be most efficient, Eureka by Netflix. It is a hassle-free procedure that does not weigh much on the application. Plus, it supports numerous types of web applications.Eureka configuration involves 2 steps – Client configuration and server configuration.Client configuration can be done easily by using the property files. In the classpath, Eureka searches for eureka-client.properties. It also searches for overrides caused by the environment in property files that are environment-specific.For server configuration, you have to configure the client first. Once that is done, the server fires up a client which is used to find other servers. The Eureka server, by default, uses the Client configuration to find the peer server.10. Why Would You Opt For Microservices Architecture?A very common microservices interview question which you should be ready for! There are plenty of pros that are offered by Microservices architecture. Here are a few of them:Microservices can adapt easily to other frameworks or technologies.Failure of a single process does not affect the entire system.Provides support to big enterprises as well as small teams.It can be deployed independently and in relatively less time.11. Why Would You Need Reports & Dashboards In Microservices?Reports and dashboards are mainly used to monitor and upkeep microservices. There are multiple tools that help to serve this purpose. Reports and dashboards can be used to:find out which microservices expose what resources.find out the services which are impacted whenever changes in a component occur.provide an easy point that can be accessed whenever documentation is required.Versions of the components which are deployed.To obtain a sense of maturity and compliance from the components.12. Why Do People Hesitate In Using Microservices?I have seen many of us fumble over this question. After all, we are appearing for microservices interview questions to be hired as a Microservices architect, so acknowledging cons could always be a little tricky. Here is the answer:Requires heavy investment – Microservices demand a great deal of collaboration. Since your teams are working independently, they should be able to synchronize well at all times.Heavy architecture set up – The system is distributed, the architecture is heavily involved.Excessive planning for handling operations overhead – You need to be ready for operations overhead if you are planning to use Microservices architecture.Autonomous staff selection – Skilled professionals are needed who can support microservices that are distributed heterogeneously.13. How Does PACT Work?PACT is an open-source tool. It helps in testing the interactions between consumers and service providers. However, it is not included in the contract, increasing the reliability of the application.The consumer service developer starts by writing a test that defines a mode of interaction with the service provider. The test includes the provider’s state, the request body and the response that is expected. Based on it, PACT creates a stub against which the test is executed. The output is stored in a JSON file.14. Define Domain Driven DesignThe main focus is on the core domain logic. Complex designs are detected based on the domain’s model. Involves collaboration with domain experts constantly to resolve issues related to the domain and improve the model of the application. While answering this microservices interview question, you will also need to mention the core fundamentals of DDD. They areDDD focuses mostly on domain logic and the domain itself.Complex designs are completely based on the domain’s model.To improve the design of the model and fix any emerging issues, DDD constantly works in collaboration with domain experts.15. What is Coupling and Cohesion?The coupling can be considered to be the measurement of strength between the dependencies of a component. A good Microservices application design always consists of low coupling and high cohesion.Following the previous question, often the interviewer will ask about cohesion. It is also another measurement unit. More like a degree to which the elements inside a module remain bonded together.If you are appearing for microservices interview questions then it is imperative to keep in mind that an important key to design microservices is a composition of low coupling along with high cohesion. When loosely coupled, a service knows very little about other. This keeps the services intact. In high cohesion, it becomes possible to keep all the related logic in a service. Otherwise, the services will try to communicate with each other, impacting the overall performance.16. What Is OAuth?Open Authorization Protocol, otherwise known as OAuth, helps to access client applications using third-party protocols like Facebook, GitHub etc via HTTP. You can also share resources between different sites without the requirement of credentials.OAuth allows the account information of the end user to be used by a third party like Facebook while keeping it secure (without using or exposing the user’s password). It acts more like an intermediary on the user’s behalf while providing a token to the server for accessing the required information.17. Why Do We Need Containers For Microservices?To manage a microservice-based application, containers are the easiest alternative. It helps the user to individually deploy and develop. You can also use Docker to encapsulate the microservice in the image of a container. Without any additional dependencies or effort, microservices can use these elements.18. What Are The Ways To Access RESTful Microservices?This is another one of the frequently asked microservices interview questions is how to access RESTful Microservices? You can do that by 2 methods –Using a rest template that is load balanced.Using multiple microservices.19. What Are Some Major Roadblocks For Microservices Testing?Talking about the cons, here is another one of the microservices interview questions you may be ready for, will be around the challenges faced while testing microservices.Tester should have a thorough understanding of all the inbound and outbound processes before he starts writing the test cases for integration testing.When independent teams are working on different functionalities, collaboration can prove to be quite a struggling task. It can be tough to find an idle time-window to perform a complete round of regression testing.With an increasing number of microservices, the complexity of the system also increases.During the transition from monolithic architecture, testers must ensure that there is no disruption between the internal communication among the components.20. Common Mistakes Made While Transitioning To MicroservicesNot only on development, but mistakes also lies on the process side often. And any experienced interviewer will have this under the queue for microservices interview questions. Some of the common mistakes areOften the developer fails to outline the current challenges.Rewriting the programs that are already existing.Responsibilities, timeline, and boundaries not clearly defined.Failing to implement and figure out the scope of automation from the very beginning.21. What Are The Fundamentals Of Microservices Design?This is probably one of the most frequently asked microservices interview questions. Here is what you need to keep in mind while answering to it:Define a scopeCombine loose coupling with high cohesionCreate a unique service which will act as an identifying source, much like a unique key in a database tableCreating the correct API and take special care during integration.Restrict access to data and limit it to the required levelMaintain a smooth flow between requests and responseAutomate most processes to reduce time complexityKeep the number of tables to a minimum level to reduce space complexityMonitor the architecture constantly and fix any flaw when detected.Data stores should be separated for each microservices.For each microservices, there should be an isolated build.Deploy microservices into containers.Servers should be treated as stateless22. Where Do We Use WebMVC Test Annotation?WebMvcTest is used for unit testing Spring MVC applications. As the name suggests, it focuses entirely on Spring MVC components. For example,@WebMvcTest(value = ToTestController.class, secure = false):Here, the objective is to launch only ToTestController. Until the unit test has been executed, other mappings and controllers will not be launched.23. What Do You Mean By Bounded Context?A central pattern usually seen in domain driven design, Bounded Context is the main focus of the strategic design section of DDD. It is all about a deal with large teams and models.. DDD works with large models by disintegrating them into multiple bounded context. While it does that, it also explains the relationship between them explicitly.24. What Are The Different Types Of Two-Factor Authentication?There are 3 types of credentials required for performing a two-factor authentication.A thing that you know – like password or pin or screen lock pattern.A physical credential that you have – like OTP or phone or an ATM card, in other words, any kind of credential that you have in an external or third-party device.Your physical identity – like voice authentication or biometric security like a fingerprint or eye scanner.25. What Is A Client Certificate?This is a type of digital certificate usually used by client systems for making a request that is authenticated by a remote server. It plays an important role in authentication designs that are mutual and provides strong assurance of the identity of a requester. However, you should have a fully configured back-end service for authenticating your client certificate.26. What Did The Law Stated By Melvin Conway Implied?You may have this one under the interviewer’s checklist for microservices interview questions. Conway’s law stated “organizations which design systems … are constrained to produce designs which are copies of the communication structures of these organizations.”The interviewer may ask a counter microservices interview question like how is the Melvin Conway Law related to microservices. Well, some loosely coupled APIs form the architecture of microservices. The structure is well suited to how a small team is implementing components which are autonomous. This architecture makes an organization much more flexible in restructuring its work process.27. How to Configure Spring Boot Application Logging?Spring Boot comes with added support for Log4J2, Java Util Logging, and Logback. It is usually pre-configured as console output. They can be configured by only specifying logging.level in the application.properties file.logging.level.spring.framework=Debug28. How Would You Perform Security Testing of Microservices?Before answering this microservices interview question, explain to the interviewer that microservices cannot be tested as a whole. You will need to test the pieces independently. There are 3 common proceduresCode scanning – To ensure that any line of code is bug-free and can be replicated.Flexibility – The security solution should be flexible so that it can be adjusted as per the requirements of the system.Adaptability – The security protocols should be flexible and updated to cope up with the new threats by hackers or security breaches.29. What is Idempotence and How is it Used?Idempotence refers to a scenario where you perform a task repetitively but the end result remains constant or similar.Idempotence is mostly used as a data source or a remote service in a way that when it receives more than one instruction, it processes only one instruction.That’s all from our side. However, if you are seriously thinking about a technology switch, don’t depend on these microservices interview questions alone. Since experienced interviewers will also ask cross-questions to check how much in-depth knowledge you have. Go for courses or online tutorials and study about Microservices in detail so that you can answer the questions stated above along with connected questions as well.30. What does one mean by Load Balancing ? How is it implemented in Spring Cloud?In computing, load balancing improves the distribution of workloads across multiple computing resources, such as computers, a computer cluster, network links, central processing units, or disk drives. Load balancing aims to optimize resource use, maximize throughput, minimize response time, and avoid overload of any single resource. Using multiple components with load balancing instead of a single component may increase reliability and availability through redundancy. Load balancing usually involves dedicated software or hardware, such as a multilayer switch or a Domain Name System server process.In SpringCloud this can be implemented using Netflix Ribbon.31: How to achieve server side load balancing using Spring Cloud?Server side load balancing can be achieved using Netflix Zuul.Zuul is a JVM based router and server-side load balancer by Netflix.It provides a single entry to our system, which allows a browser, mobile app, or another user interface to consume services from multiple hosts without managing cross-origin resource sharing (CORS) and authentication for each one. We can integrate Zuul with other Netflix projects like Hystrix for fault tolerance and Eureka for service discovery, or use it to manage routing rules, filters, and load balancing across your system.32: What is Pivotal Cloud Foundry(PCF)?A: Some time back all the IT infrastructure was on premises. There we in house servers managed by an IT resource personnel or a service provider.Then with the advent of cloud services, these software and hardware services are now delivered over the internet rather than being on premises.Cloud Foundry is an open source, multi-cloud application platform as a service governed by the Cloud Foundry Foundation. The software was originally developed by VMware and then transferred to Pivotal Software, a joint venture by EMC, VMware and General Electric.It is a service (PaaS) on which developers can build, deploy, run and scale applications.Many Organizations provide the cloud foundry platform separately. For example, the following are some cloud foundry providers-Pivotal Cloud FoundryIBM BluemixHPE Helion Stackato 4.0Atos CanopyCenturyLink App FogHuawei FusionStageSAP Cloud PlatformSwisscom Application CloudThank you.

What it means to believe in Jesus Christ and what it means to rest in Christ. I was wrong about this for most of my life.What it means to believe in Jesus ChristGrowing up, my mom had a printout featuring the names of God (in Hebrew) and what they mean. One is Jehovah Rapha- "The Lord Who Heals." As believers in Christ, we depend on the Lord for healing. Also Jehovah Jireh- "The Lord will Provide." When we are in need (of good health, jobs, financial provision, wisdom, peace of mind, whatever,) we depend on Christ/rest in Christ for provision of these needs. Just to digress a little, rest in Christ isn't sitting idly and doing nothing as we'll see below.Back to the names of God on my mom's poster. Out of all of His names - Jehovah Rohi, Jehovah Nissi, El-Gibbor, Adonai and the rest- one stuck to my brain because for me, it wasn't as famous as the rest: Jehovah Tsidkenu- The Lord our Righteousness. I never knew how crucial this name is to our salvation.Romans 10:9-10 says "that if you confess with your mouth Jesus as Lord, and believe in your heart that God raised Him from the dead, you will be saved; 10 for with the heart a person believes, resulting in righteousness, and with the mouth he confesses, resulting in salvation."Many have no problem with confessing that Jesus is Lord (Jehovah) but Lord of what? Is He really Lord of all areas of our lives? When we are sick, we believe, acknowledge and confess Him as Jehovah Rapha- The Lord Who Heals. His other names- Jehovah Nissi, Jehovah Jireh, Jehovah Shammah, and so on- we rely on Him to help us in areas where our lives do not mirror His perfection, as His Names mean for us in these times. We believe in our hearts and confess with our mouths His provision that we are yet to see physically in these areas. But somehow, we hesitate when it comes to the most crucial one for us today: Jehovah Tsidkenu- The Lord our Righteousness.When it comes to attaining righteousness, of which we have none ("As it has been written: "There is none righteous, not even one;" Romans 3:10) instead of depending on Him for Righteousness as we do every other thing that we lack, we become shy and try to be righteous on our own by keeping the law and doing good things aka self-righteousness. See Romans 10:10 above: only when we acknowledge and confess Christ as THE LORD OUR RIGHTEOUSNESS do we have salvation; including salvation from acts of sin, sickness, oppression, depression and every earthly ill.Believer, we are living the reality of Jeremiah's prophecy where the Lord Himself said in Jeremiah 23:6"Now this is His name by which He will be called: THE LORD OUR RIGHTEOUSNESS."Romans 5:19 says "For as by one man’s disobedience many were made sinners, so also by one Man’s obedience many will be made righteous."2 Corinthians 5:21 says: "For He made Him who knew no sin to be sin for us, that we might become the righteousness of God in Him."In Christ, the Lord Himself is our Righteousness. We have none of ours. This is the whole essence of the message of Christ- justification (righteousness) by faith. We can never be made righteous in God's sight through our works. Isaiah 64:6 calls our own righteousnesses "a menstrual rag."Romans 3:20 says "For no on can ever be made right with God by doing what the law commands. The law simply shows us how sinful we are."Yet we try. Many of us actively reject Christ as “The Lord our Righteousness” and hug the letter that kills tight to attain righteousness. Trying to get right with God by human effort is to reject the Lord as one's Righteousness, and the result of this can be seen in Galatians 5:4- "For if you are trying to make yourselves right with God by keeping the law, you have been cut off from Christ! You have fallen away from God’s grace."Paul says in Galatians 2:21— “I refuse to reject the grace of God. But if a person is put right with God through the Law, it means that Christ died for nothing!”Back to Romans 10:9-10 says "that if you confess with your mouth Jesus as Lord, and believe in your heart that God raised Him from the dead, you will be saved; 10 for with the heart a person believes, resulting in righteousness, and with the mouth he confesses, resulting in salvation."Understand what “believe in your heart that God raised Him from the dead” is all about. We see this in Romans 4:25 where it is said of our Saviour: "Who was delivered up because of our offences, and was raised up because of our being declared righteous."The TPT puts it this way: "Jesus was handed over to be crucified for the forgiveness of our sins and was raised back to life to prove that He had made us right with God!"Also see Hebrews 10:12— “But our High Priest offered Himself to God as a single sacrifice for sins, good for all time.”Confessing Christ as “The Lord our Righteousness" and believing in your heart that God raised Him from the dead “because of our being declared righteous;”that all of our sins- past, present and future- have been forgiven because of Christ's “single sacrifice for sins, good for all time.”that His resurrection is the divine evidence that we have been made righteous forever and apart from worksThis is what it means to believe on the Lord Jesus Christ.To not believe this, evidenced by trying to get right with God and inherit eternal life through the Ten Commandments and doing good deeds, is to deny the death of Christ and His resurrection.Believers, let's not be found here. Do you still have sins and shortcomings that you have been trying to overcome by your own effort, even worry? Stop depending on your own puny arm of flesh that will fail and start believing that the Lord is your Righteousness, much like how a sick person believes that to her, He is Jehovah Rapha.Matthew 1:21 says of Christ: “She will bear a Son; and you shall call His name Jesus, for He will save His people from their sins.” He came to save us from our sins, not condemn us for them.Romans 5:9 says of Him: “Much more then, because we have now been declared righteous by His blood, we will be saved through Him from God’s wrath.” He came to save us from God's wrath, not make sure we get the punishment of death (earthly ills are “death begun"), even death in hell, that we deserve.How can our Saviour who came to save us from our sins use those very sins that He came to save us from as an excuse for not saving us, even threaten us with God's wrath that He came to save us from?Confess your righteousness in Christ and salvation from sins will follow, “for with the heart a person believes, resulting in righteousness, and with the mouth he confesses, resulting in salvation."Ask Him to help you believe right. He will help you, FREELY and not because you sowed a seed or did your best to be godly by obeying the law (Romans 8:32.)When you seek first His kingdom and His righteousness, not yours from your good works and law-keeping, all these things, including grace to go and sin no more, will be added unto you. Remember Isaiah 54:17-“No weapon formed against you shall prosper, And every tongue which rises against you in judgment You shall condemn. This is the heritage of the servants of the Lord, And their righteousness is from Me,” Says the Lord.”This promise is not just for anyone that can attach the name of Jesus to each prayer point. It is an inheritance (heritage) and cannot be obtained by fasting for 100 days, doing good things or obeying the law. It is for those who call Christ by His name "THE LORD OUR RIGHTEOUSNESS" and are not trying to get right with God by their puny attempts at keeping the Ten Commandments or doing anything else aka pride. Only believe, and even this is by grace.This is the logic of heaven. According to 1 Cor. 1:18-"For the message of the cross is foolishness [absurd and illogical] to those who are perishing and spiritually dead [because they reject it], but to us who are being saved [by God’s grace] it is [the manifestation of] the power of God."The law does not grade on the curve. If you break one law, you are guilty of all says James 2:10. The letter kills. Grace too does not grade based on how sinful you are. In fact, your sins and your helplessness against sin, the curse and death are what make you a candidate for God's grace. No matter how vile and offensive your sins are, believing Him and with Him as your Righteousness, the Lord sees you as righteous through and through, because your righteousness is not your own. It is Christ's. And this is the result of having the Lord as your righteousness: YOU GET TO LIVE IN TRIUMPH OVER SIN AND DEATH- Romans 5:17-"For the sin of this one man, Adam, caused death to rule over many. But even greater is God’s wonderful grace and His gift of righteousness, for all who receive it will live in triumph over sin and death through this one Man, Jesus Christ."What it means to rest in Christ.When we are in need (of good health, jobs, financial provision, wisdom, peace of mind, whatever,) we depend on Christ/rest in Him for provision of these needs. This dependence on the Lord does not mean that as believers, we just sit on our hands and do nothing; some people, even those who profess Christ, have told me things like "So Jesus will come down from heaven and write that article for your client and pay your bills. You still have to play your part by writing it." But even when I'm hunched down for hours in front of my laptop, back aching and eyes sore from lack of sleep/writing technical pieces on subjects that I know nothing about, I know it's not me but Christ in me. No longer I that live; the method and outcomes always amaze me.Rest in Christ is not inactivity. Rest in Christ is Holy Spirit-directed activity. It is God who gives power to create wealth according to Deut. 8:18. His blessings in our lives are so supernaturally natural that we think we did good all by ourselves. Psalm 127:1 says-"Unless the Lord builds the house, They labor in vain who build it; Unless the Lord guards the city, The watchman keeps awake in vain."It's like a Christian who builds a house and hires a security company to watch over his family who live in it. All of our efforts would be in vain if Christ is not the One doing. But this is not to say that the believer who rests in Christ idly waits for an angel to come and stack building blocks into a house for him or waits for an angel to hire a security firm to watch over his family where security threats abound. It is God who gives power to create wealth according to Deut. 8:18. In Christ, the thoughts of the Holy Spirit become our action. God works in us both to will and to do for His good pleasure (see Philippians 2:13.) Colossians 1:17 says "In union with Him all things have their proper place." Based on the leading of the Holy Spirit that dwells in the believer, he might or might not hire security. Common sense aka earthly wisdom says “hire a security firm because threats abound.” But the right/common sense thing to do is not always the Spirit thing to do. If he decides to hire security believing that it is God who works in him the desire and the ability to do His good pleasure, he will not hire one that will end up being the thief/murderer that he is trying to keep away from his family.You know that you are led by the Spirit when you are unable to boast or take any credit for your good decisions and successes. You give all the credit to the Lord our Shepherd who leads us on the path of righteousness and take no credit for your ability to "play your part," as it is written in Ephesians 2:8–10:“God saved you by His grace when you believed. And you can’t take credit for this; it is a gift from God. 9 Salvation is not a reward for the good things we have done, so none of us can boast about it. 10 For we are God’s masterpiece. He has created us anew in Christ Jesus, so we can do the good things He planned for us long ago.”"Salvation" here is not just being saved to go to heaven; it encompasses deliverance from bad decisions, molestation of enemies and redemption from all earthly ills (anxiety, depression, sickness, lack, stupid mistakes, anything that can cause us harm, etc.) It is being saved from the power, pleasure and penalty of sin. The word used in the original Greek text of the New Testament is Swthria (pronounced soteria) and it encompasses all these meanings.As believers, we are never separate from Christ. The same "True Vine" life that flows in Him is constantly flowing in us and nourishing us. We are His branches and can do nothing without Him. Our daily life isn't peripheral to Christ. Christ is the centre of everything. He holds everything together, moreso for all who believe. Colossians 1:17 says "He existed before all things, and all things are held together in Him."The Good News Translation says "Christ existed before all things, and in union with Him all things have their proper place."Things fall out of "their proper place" when we put aside our union with Him and think that we can do some things apart from Him or "play our part," especially in a bid to earn His blessings.