java

What is Data access object (DAO) in Java

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The Data Access Object is basically an object or an interface that provides access to an underlying database or any other persistence storage. That definition from: http://en.wikipedia.org/wiki/Data_access_object Check also the sequence diagram here: http://www.oracle.com/technetwork/java/dataaccessobject-138824.html Maybe a simple example can help you understand the concept: Let’s say we have an entity to represent an employee: public … Read more

How do I generate a Dashboard Report in jmeter?

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steps: 1.Add ‘Summary Report’, ‘Simple Data Writer’ from Listeners. 2.Set location to generated csv 3.open reportgenerator.properties from “D:\apache-jmeter-3.0\bin\” copy all content from it 4.Open user.properties from same bin folder 5.Append all from reportgenerator.properties to user.properties and save 6.Now run the your Test script 7.open cmd and enter jmeter -g D:\Report\TC001_Result.csv -o C:Report\ReportD Go to C:Report\ReportD … Read more

Spring Boot Page Deserialization – PageImpl No constructor

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Found the answer in the different post on here. It was not the accepted answer which it should be Spring RestTemplate with paginated API the answer by @rvheddeg is correct. You just need to put @JsonCreator and provide a constructor with all the properties, here is my RestResponsePage class that fixes the issue. class RestResponsePage<T> … Read more

Sorting a double value of an object within an arrayList

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To use a Comparator: Collections.sort(myList, new Comparator<Chromosome>() { @Override public int compare(Chromosome c1, Chromosome c2) { return Double.compare(c1.getScore(), c2.getScore()); } }); If you plan on sorting numerous Lists in this way I would suggest having Chromosome implement the Comparable interface (in which case you could simply call Collections.sort(myList), without the need of specifying an explicit … Read more

Custom response header Jersey/Java

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I think using javax.ws.rs.core.Response is more elegant and it is a part of Jersey. Just to extend previous answer, here is a simple example: @GET @Produces({ MediaType.APPLICATION_JSON }) @Path(“/values”) public Response getValues(String body) { //Prepare your entity Response response = Response.status(200). entity(yourEntity). header(“yourHeaderName”, “yourHeaderValue”).build(); return response; }