PROGRAMMING LAB

Spring Cloud Contract  is a project that, simply put, helps us write Consumer-Driven Contracts (CDC). This ensures the contract between a Producer and a Consumer, in a distributed system – for both HTTP-based and message-based interactions. Producer – Server Side For our producer side, we'll need the spring-cloud-starter-contract-verifier dependency. Producer Side Setup Test stubs are in /src/test/resources/contracts/ package. When the build is run, the plugin automatically generates a test class named ContractVerifierTest that extends our BaseTestClass and puts it in /target/generated-test-sources/contracts/. The names of the test methods are derived from the prefix “validate_” concatenated with the names of our Groovy test stubs. For the above Groovy file, the generated method name will be “validate_find_provider_by_id()”. Consumer – Client Side The consumer side of our CDC consume stubs generated by the producer side through HTTP interaction to maintain the contract...

  Jenkins  is an open source, Java-based automation server that offers an easy way to set up a continuous integration and continuous delivery (CI/CD) pipeline. Continuous Integration (CI) is the process of automating the build and testing of code every time a team member commits changes to version control. Continuous Delivery (CD) is the process to build, test, configure and deploy from a build to a production environment.    Jenkins docker image with docker inside Step 1/ Create Dockerfile extending the official Alpine image. Then get jenkins.war and docker from official sites. Step 2/ Jenkins admin user setup to set a default admin user and password, by creating a Groovy script file. Step 3/ Adding Plugins to auto install some selected plugins. Step 4/ Build Your Custom Jenkins Image Here  is a fully functional Jenkins server.

  Reflection is another form of meta-programming, and just as valid, as the type-based parameters that you see in most languages these days. Reflection is powerful and generic, and reflective programs are a high order of maintainability (when used correctly, of course) and more so than purely object-orientated or procedural programs.  Reflection is fantastic for building tools for developers. With the advent of Java 9  the approach  to encapsulate has changed and the scary-sounding message appeared: WARNING: An illegal reflective access operation has occurred   WARNING: Illegal reflective access by ReflBytecodeName (file:/Users/ben/projects/books/resources/) to method sun.invoke.util.BytecodeName.parseBytecodeName(java.lang.String) WARNING: Please consider reporting this to the maintainers of ReflBytecodeName   WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations   WARNING: All illegal access operation...