The Techno Journals

Soap over JMS comes with several benefits like, asynchronous processing, one time delivery, assured delivery. This paradigm is mainly used internally in an organization (service providers and clients). In this tutorial we are going to use Spring boot and Apache CXF to develop a Soap service and then use Active MQ to make it work as "Soap Over JMS". Creating Soap service using Spring boot and Apache CXF It is very easy to develop a Soap service with Spring boot. We will follow contract first approach to develop the service. We will create a XML schema & use jaxb2 plugin to generate necessary schema classes and then implement the service using them. Please refer below post where it explains in detail, how to develop a Soap service using Spring boot and CXF. https://www.thetechnojournals.com/2020/01/soap-services-with-spring-boot-and.html Implementing Soap over JMS To implement the Soap over JMS we need to integrate JMS with soap service where our service listens to...

In this tutorial we are going to learn how to develop a SOAP web service using Spring boot and Apache CXF. We will follow the contract first approach to develop our service where we will use jaxb2 maven plugin to generate the java classes which we will use for service implementation. Why contract first With contract first our primary focus stays with the contract of service to be implemented. Also it is useful to match the input/output with business requirement. We can share the contract with other business units/ customers or users, so it helps them to start early without waiting for the complete implementation. Once our contract is ready we can generate the Java classes using jaxb plugin which generates the java objects using the schema for SOAP contract and we need to focus only on service implementation. SOAP service development (Hello service) This service will have one operation where user can send their name and in response they will get a hello message with the passed na...

In this tutorial we will learn how to use Spring boot and SPNEGO API to implement the kerberos or integrated authentication. Kerberos is developed by Massachusetts Institute of Technology (MIT) which is used to authenticate between trusted services using KDC tickets. For example email client, HR portal or employee portal in a corporate network where employee doesn't need to provide their user id & password to access these application in the same domain. Once they are logged in to their machine, they can access such services/application with kerberos authentication. I am using MAC OS X to demonstrate the kerberos authentication. I have used the same machine to configure and run the application backed with kerberos authentication and my KDC database & application reside on the same machine. Setting up kerberos  First of all we need to setup kerberos where we will configure the database, create user principals, create policies and keytabs. We need to create our applicatio...

Kerberos in MAC OS X Kerberos authentication allows the computers in same domain network to authenticate certain services with prompting the user for credentials. MAC OS X comes with Heimdal Kerberos which is an alternate implementation of the kerberos and uses LDAP as identity management database. Here we are going to learn how to setup a kerberos on MAC OS X which we will configure latter in our application. Installing Kerberos In MAC we can use Homebrew for installing any software package. Homebrew makes it very easy to install the kerberos by just executing a simple command as given below. brew install krb5 Once installation is complete, we need to set the below export commands in user's profile which will make the kerberos utility commands and compiler available to execute from anywhere. Open user's bash profile: vi ~/.bash_profile Add below lines: export PATH=/usr/local/opt/krb5/bin:$PATH export PATH=/usr/local/opt/krb5/sbin:$PATH export LDFLAGS=...

There are multiple ways to count the characters or find the duplicate characters in a String. Here we will see the two approaches for the same which may be useful in same or different scenarios. Count or find duplicate characters using Hash Map With hash map we can keep the character count in the map against given character which is used as map key. Map uses hashcode to store the keys. To learn more on map storage, you can refer the link  Why hashmap keys should be immutable . public void countCharUsingMap(String str){ Map<Character, Integer> countMap = new HashMap<>(); for(Character ch:str.toCharArray()){ int count = countMap.get(ch)==null?1:countMap.get(ch)+1; countMap.put(ch, count); } countMap.forEach((k,v)->{ System.out.println("'"+k+"' : "+v+(v>1?"[DUP]":"")); }); } This code has stored the count for each character in Map, whi...

Spring batch is used to create and process the batch jobs. It provides various features like logging, job statistics, transaction management, restarting jobs. It is very helpful in processing of large dataset but with finite volume of data. In this tutorial we will learn how to create and execute the spring batch job. In our example we will create a job which will import all the words from a text file to database and then at last it will print the total number of words available in the database. Below is the project structure. Creating batch job Sample text file to import Below is the contents of text file which we use for importing the words. The list below gives you the 1000 most frequently used English words in alphabetical order. Once you've mastered the shorter vocabulary lists, this is the next step. It would take time to learn the entire list from scratch, but you are probably already familiar with some of these words. Feel free to copy this list into...

Here we will see how we can configure different datasource for application and batch. By default, Spring batch stores the job details and execution details in database. If separate data source is not configured for spring batch then it will use the available data source in your application if configured and create batch related tables there. Which may be the unwanted burden on application database and we would like to configure separate database for spring batch. To overcome this situation we will configure the different datasource for spring batch using in-memory database, since we don't want to store batch job details permanently. Other thing is the configuration of  spring cloud task in case of multiple datasource and it must point to the same data source which is pointed by spring batch. In below sections, we will se how to configure application, batch and cloud task related data sources. Application Data Source Define the data source in application properties or yml con...