In this post under Spring Batch, I will explain the purpose of JsonLineMapper with an example. JsonLineMapper is used with reader bean for reading file containing JSON input as shown below JsonFileInput.txt {“id”:”id0″,”name”:”name0″,”status”:”status0″,”salary”:0}{“id”:”id1″,”name”:”name1″,”status”:”status1″,”salary”:1}{“id”:”id2″,”name”:”name2″,”status”:”status2″,”salary”:2}{“id”:”id3″,”name”:”name3″,”status”:”status3″,”salary”:3}{“id”:”id4″,”name”:”name4″,”status”:”status4″,”salary”:4}{“id”:”id5″,”name”:”name5″,”status”:”status5″,”salary”:5}{“id”:”id6″,”name”:”name6″,”status”:”status6″,”salary”:6}{“id”:”id7″,”name”:”name7″,”status”:”status7″,”salary”:7}{“id”:”id8″,”name”:”name8″,”status”:”status8″,”salary”:8}{“id”:”id9″,”name”:”name9″,”status”:”status9″,”salary”:9} Each line in the file is interpreted as a JSON object by JsonLineMapper. So each line must start with “{” and end…… Continue reading JsonLineMapper Example
Formatting batch file output
In this post under Spring Batch, I will show how to create batch files with formatted output. The example I use will generate output file where the width of the each fields are fixed. In all my previous posts under Spring Batch, the output of the examples generated will be as shown below Current Output…… Continue reading Formatting batch file output
Using JsonbCreator annotation
In this post under JSONB, I will explain the purpose of JsonbCreator annotation with an example. Whenever we deserialize a json data to java object, it is required that the Class of the object should have default/no argument constructor, so that JSONB runtime can create an instance of the class with the help of the…… Continue reading Using JsonbCreator annotation
Using Custom DateFormat
In this post, under JSONB, I will explain how to use custom date format when serializing/deserializing Java object containing date information to json format. By default JSONB when converting date information to json it prints in the format as shown below 2019-02-16T07:16:38.537Z[UTC] We can change this format globally, globally meaning the custom format will be…… Continue reading Using Custom DateFormat
Custom format for Property names using PropertyNamingStrategy Part 2
In this post under JSONB, I will continue explaining how to create custom format for property names using PropertyNamingStrategy interface. In the post, “Custom format for Property names using PropertyNamingStrategy Part 1”, I listed the different formats provided by the interface out of the box, which are 1) CASE_INSENSITIVE 2) IDENTITY 3) LOWER_CASE_WITH_DASHES 4) LOWER_CASE_WITH_UNDERSCORES…… Continue reading Custom format for Property names using PropertyNamingStrategy Part 2
Custom format for Property names using PropertyNamingStrategy Part 1
In this post under JSONB, I will explain how to create custom format for property names using PropertyNamingStrategy interface. Whenever we serialize a java object to JSON format, the property or field names in json are same as property names in its corresponding java class. For example when we serialize the below java class instance…… Continue reading Custom format for Property names using PropertyNamingStrategy Part 1
RecordSeparatorPolicy interface Example
In this post of Spring Batch, I will explain with an example, the purpose of RecordSeparatorPolicy interface and how to use it. In all my previous posts under Spring Batch, the examples (i.e., input file to read from) that I used, had a collection of records, where each record were delimited by new line as…… Continue reading RecordSeparatorPolicy interface Example
Storing Job Repository in In-Memory datastore
In this post under Spring Batch, I will explain what is the purpose of Job Repository in Spring Batch and how to store it in In-Memory datastore. Job Repository is used to store the state of a Job (finished or currently executing). In other words Job Repository stores all the metadata of a Job. Informations…… Continue reading Storing Job Repository in In-Memory datastore
Transforming items using ItemProcessor
In this post under Spring Batch, I will explain how to achieve Item Transformation using ItemProcessor interface. Item Transformation process transforms the items read by reader before sending them to the writer. The transformation involves changing the state of the read itemor creating a completely new object. In the second case, the written item type…… Continue reading Transforming items using ItemProcessor
Combining two or more Function functional interface
In this post, I will explain how to combine Function functional interfaces. They are two ways in which we can combine Function functional interface and it is achieved using two methods in Function interface as mentioned below 1) default Function andThen(Function after) 2) default Function compose(Function before) Both the methods accept an implementation of Function…… Continue reading Combining two or more Function functional interface
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