Hibernate Date, TimeStamp and Time

In this post I'll demonstrate different between Hibernate Date, Time and TimeStamp with Microsoft SQL Server database. For this demonstration I will use code base of "Spring Boot REST API with SQLServer 2019" post. Git code base for the initialization of the project can find in GIT CODE base.

Prerequisites 

1. You should have install java 1.8 or above.
2. You should have Eclipse installed in your PC.
3. Your PC should setup Maven installed and configured.
4. MS SQL server need to be installed. 

Modify Model class 

For this demonstration I will add three parameters to out model class "Book". Those three parameters will map to respective columns in "BOOKS" table which store TIMESTAMP, DATE and TIME.

@Temporal(TemporalType.TIMESTAMP)
private Date timeStamp;
@Temporal(TemporalType.DATE)
private Date date;
@Temporal(TemporalType.TIME)
private Date time;

I have added above three parameters and relevant geter/setter methods.We can define the preferred mapping with the @Temporal annotation. As you can see in above code, it takes a TemporalType enum as a value. The enum allows you to select the SQL type (DATE, TIME or TIMESTAMP) which you want to use.

Modify Service class 

Then lets update the service method of setDateTime which set values for book objects time, date and time stamp. 

private void setDateTime(Book book){
   Date date= Calendar.getInstance().getTime();
   book.setTimeStamp(date);
   book.setDate(date);
   book.setTime(date);
}

Then call this setDateTime method from saving method of Book saveBookInJSON method. 

Run the application

In order to run first we have to perform maven install command and then we can run the application

Go to run debug configuration and add following command 

spring-boot:run

Then run the application  by click on Run button

After successful execution you should be able to see similar output as show below.

Lets Test the application 

Then lets add new Book in to API

curl -H "Accept: application/json" -H "Content-type: application/json" -X POST -d "{ \"isbmNumber\":\"9999\", \"name\":\"How to develop API\", \"description\":\"sample book\", \"auther\":\"Nirmal Balasooriya \" }" http://localhost:8080/saveOrUpdate

  

For this one following output will return

{"code":"1","desc":"Book save successful","t":"9999"}

If you check the database then you could see the saved data in the database as show in below.

Saved details in the Database.

As you can see in the database Date, Time and TimeStamp values can be see as show below.

time          :  17:45:28.6600000
date          :  2020-04-12

timestamp :  2020-04-12 17:45:28.6590000

You can be find updated code base in following GIT HUB location.

Non-blocking I/O(NIO) File handling operations

In this post I will list down some of common file operations which encounter in day today basis when working. Following are required to run the provided project shared at end of the post.

Prerequisites 

1. You should have install java 1.8 or above.
2. You should have Eclipse installed in your PC.
3. Your PC should setup Maven installed and configured.

Create Files

For this one also we can use Files.createFile method in java.nio.file.Files class. For this method we need to provide Path object of new file.  Note that this method will throw java.nio.file.FileAlreadyExistsException when file already existing. As you can see sample code in createFile() method.

String parentFolderPath="C:\\JAVA8_FILE_HANDLING\\src\\main\\resources\\PARENT_FOLDER\\";

File newFile= new File(parentFolderPath+"Test.txt");

if(!newFile.exists())
    Files.createFile(newFile.toPath());

System.out.println("Newly created file exists :: "+newFile.exists());

List everything in a folder

For listing of folder we can useFiles.list method in java.nio.file.Files class. For that method we can pass the folder path which we need to list down. Note that this list method will throw IOException so we have to handle it in our code. You can see sample code in listDownAllFilesAndFolder() method.

String parentFolderPath=
"C:\\JAVA8_FILE_HANDLING\\src\\main\\resources\\PARENT_FOLDER\\";

List fileList = Files.list(Paths.get(parentFolderPath)).collect(Collectors.toList());

fileList.forEach(System.out::println);

Search file in a folder

For this one also we can use Files.list method in java.nio.file.Files class with Filter functionality. As you can see sample code in SearchFilesInFolder() method.

String parentFolderPath=
"C:\\JAVA8_FILE_HANDLING\\src\\main\\resources\\PARENT_FOLDER\\";

String fileToSearch="srilanka";


List fileList = Files.list(Paths.get(parentFolderPath))
        .filter(path -> new File(path.toString()).getName().startsWith(fileToSearch))
        .collect(Collectors.toList());

fileList.forEach(System.out::println);

Read Property File Line by Line

For this one also we can use Files.lines method in java.nio.file.Files class and with help of Stream we can put all lines in to List as show in below example. As you can see sample code in readPropertyFileLineByLine() method.

String fileName = 
"C:\\JAVA8_FILE_HANDLING\\src\\main\\resources\\PARENT_FOLDER\\SampleProperty-2020-04-04.properties";


List<String> list = new ArrayList<>();
try (Stream<String> stream = Files.lines(Paths.get(fileName))) {
    
    list = stream
            .collect(Collectors.toList());} 
catch (IOException e) {
    e.printStackTrace();
}

list.forEach(System.out::println);

Moving Files and Folders

For this one also we can use Files.move method in java.nio.file.Files class and for this method we need to provide source path and destination path. For this method we can pass optional parameter which we can say to program whether we need to override existing files in destination folder. One most important thing in this method is it will remove all the items inside source folder and source folder it self as well. As you can see sample code in moveFilesAndFolders() method. 

String parentFolderPath="C:\\JAVA8_FILE_HANDLING\\src\\main\\resources\\PARENT_FOLDER\\";

String destFolderPath="C:\\JAVA8_FILE_HANDLING\\src\\main\\resources\\OUTPUT\\";

Files.move(Paths.get(parentFolderPath),Paths.get(destFolderPath)
, StandardCopyOption.REPLACE_EXISTING);

List fileList = Files.list(Paths.get(destFolderPath)).collect(Collectors.toList());

fileList.forEach(System.out::println);

Setup MICROSOFT SQL SERVER Data source in JBoss EAP 7.1

In this post I will demonstrate how to setup Microsoft SQL Server Data source in JBoss EAP 7.1. I will use code base of my previous post "Passing spring application parameters in EAP 7.1"(Initial code base)

Prerequisites 

1. You should have install java 1.8 or above.
2. You should have Eclipse installed in your PC.
3. Your PC should setup Maven installed and configured.
4. Your PC should have installed MySQL and Server need to have user who have access to the configured database and user should able to log in to the database by user name/password. 

Install MSSQL driver in JBoss EAP

First lets download a JDBC Driver based on SQLServer version. You can download the JDBC Driver from Microsoft's site: https://docs.microsoft.com/en-us/sql/connect/jdbc/microsoft-jdbc-driver-for-sql-server

I downloaded the "sqljdbc4-2.0.jar" which compatible with my SQL server version. Lets keep the downloaded jar in temporary folder. In my case I'll keep it on "G:/" drive. 

So lets use "JBoss-cli" in order to add the Driver and JNDI in to EAP. You can find the jboss-cli in <JBOSS_HOM>/bin directory.

You can start the EAP first by double click on standalone.bat and then start jboss-cli by double click jboss-cli.jar.

Then you can enter connect command in order to connect to EAP.

connect

Then you can enter following command

module add --name=sqlserver.jdbc --resources=@INSTALL_FOLDER@/libext/jtds-1.3.1.jar --dependencies=javax.api,javax.transaction.api
/subsystem=datasources/jdbc-driver=sqlserver:add(driver-module-name=sqlserver.jdbc,driver-name=sqlserver,driver-class-name=@JDBC_DRIVER@)
/subsystem=datasources/data-source=@DATASOURCENAME@:add(jndi-name=java:jboss/@JNDI_NAME@,enabled="true",use-java-context="true",driver-name=sqlserver,connection-url="@JDBC_URL@",user-name=@JDBC_USER@,password=@JDBC_PASSWORD@,validate-on-match=true,background-validation=true)

This is stranded command which you can replace with your parameters. So based on my parameter details Command would be something like below. I have highlighted the modifications which I have done.


module add --name=sqlserver.jdbc --resources=G:\sqljdbc4-2.0.jar --dependencies=javax.api,javax.transaction.api
/subsystem=datasources/jdbc-driver=sqlserver:add(driver-module-name=sqlserver.jdbc,driver-name=sqlserver,driver-class-name=com.microsoft.sqlserver.jdbc.SQLServerDriver)
/subsystem=datasources/data-source=MSSQLDATASOURCE:add(jndi-name=java:jboss/MSSQLJNDI,enabled="true",use-java-context="true",driver-name=sqlserver,connection-url="jdbc:sqlserver://localhost;databaseName=TestDB",user-name=nirmal,password=Test123_,validate-on-match=true,background-validation=true)

Once you run the command you should be able to see following output in jboss-cli.

Then also you can see following section has been added in to the standalone.xml

Lets configure Application to read JNDI

In order to read the DataSource details from JNDI just need to add JNDI string in to Spring Boot application.properties file. I have added spring.datasource.jndi-name=java:jboss/MSSQLJNDI@ application.properties file. (Note that I have commented previous datasource configuration details )

#==== connect to MSSQL ======#
#spring.jpa.hibernate.ddl-auto=update
#spring.datasource.url=jdbc:sqlserver://localhost;databaseName=TestDB
##spring.datasource.username=nirmal
##spring.datasource.password=Test123_
#spring.datasource.driverClassName=com.microsoft.sqlserver.jdbc.SQLServerDriver
#spring.jpa.database-platform=org.hibernate.dialect.SQLServer2012Dialect
server.port = 8080
spring.datasource.jndi-name=java:jboss/MSSQLJNDI@

spring.jpa.properties.hibernate.show_sql=true
spring.jpa.properties.hibernate.use_sql_comments=false
spring.jpa.properties.hibernate.format_sql=true

#==== Logging configurations ======#
logging.level.root=WARN,INFO,ERROR
logging.level.com.baeldung=TRACE

Then lets deploy the war file. For that click on Back button on left top corner and then click on deployments. Then click "Add" button. Then you should be able to see similar figure to below.

Then click next button and then Click choose file and select the generated war file from target folder in the project. Then click next and then click finish. Once installation completed you should be able to see similar output on command line.

http://localhost:8080/RestApiSpringBoot-0.0.1-SNAPSHOT/findBook/1

Also you can perform any action which I mentioned in my previous blog post.

Project source can be downloaded from following GIT HUB URL.

Managing resources using Jackrabbit with Spring Boot

In this post I will demonstrate how to work with Jackrabbit content repository with Spring Boot application. The Apache Jackrabbit content repository is a fully conforming implementation of the Content Repository for Java Technology API. A content repository is a hierarchical content store with support for structured and unstructured content, full text search, versioning, transactions, observation etc.

Prerequisites 

1. You should have install java 1.8 or above.
2. You should have Eclipse/IntelliJ Idea installed in your PC.
3. Your PC should setup Maven installed and configured.

Lets setup Jackrabbit 

You can download the latest jackrabbit from official Jackrabbit web page . I will download the war file and deploy it on JBoss EAP.

To deploy it in to JBoss EAP you should have access the web admin console. In there  go to Deployments and click "Add" button show in figure below. Then click next and select the war file you downloaded. Then click next and then click finish.

Once you successfully installed the application you should be able to access the default jackrabit web interface from http://localhost:8080/jackrabbit-webapp-2.18.5/ you should see similar page as show below.

Create your first repository by click on "Create Content Repository". By click on this button system will create the default Jackrabbit repository with default settings.

Success Page of JackRabbit repository creation 

Now when you access Jackrabbit default URL you will be able to see as follows.

When you create this repository JBoss EAP will create new folder call "jackrabbit" on <JBOSS_HOME_DIR>/bin folder. As show in below.

Lets create project 

Open InelliJ IDEA and create new maven project. I will using following details for the project.

groupId    : com.nirmal.JackrabbitSpringBoot

artifactId : JackrabbitSpringBoot

I will add relevant dependencies in to the POM file as show below.

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0"

         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.nirmal.JackrabbitSpringBoot</groupId>

    <artifactId>JackrabbitSpringBoot</artifactId>

    <version>1.0-SNAPSHOT</version>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>1.5.1.RELEASE</version>

        <relativePath />

    </parent>

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>javax.servlet</groupId>

            <artifactId>jstl</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

        <!-- Provided -->

        <dependency>

            <groupId>org.apache.tomcat.embed</groupId>

            <artifactId>tomcat-embed-jasper</artifactId>

            <scope>provided</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-data-jpa</artifactId>

        </dependency>

        <dependency>

            <groupId>com.microsoft.sqlserver</groupId>

            <artifactId>mssql-jdbc</artifactId>

            <version>6.1.0.jre8</version>

        </dependency>

        <!-- The JCR API -->

        <dependency>

            <groupId>javax.jcr</groupId>

            <artifactId>jcr</artifactId>

            <version>2.0</version>

        </dependency>

        <!-- Jackrabbit content repository -->

        <dependency>

            <groupId>org.apache.jackrabbit</groupId>

            <artifactId>jackrabbit-core</artifactId>

            <version>2.18.1</version>

        </dependency>

        <dependency>

            <groupId>org.apache.jackrabbit</groupId>

            <artifactId>jackrabbit-jcr2dav</artifactId>

            <version>2.19.3</version>

        </dependency>

        <dependency>

            <groupId>org.apache.jackrabbit</groupId>

            <artifactId>jackrabbit-jcr-commons</artifactId>

            <version>2.19.3</version>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

Then I will add application.properties file in resources folder with following content. note that I will use default jackrabit user name and password in this demonstration. Jackrabit url can be get as following format http://<ip address>:<port>/<contextpathOfJackrabitserver>/server

#==== connect to mssql ======#

spring.jpa.hibernate.ddl-auto=update

spring.datasource.url=jdbc:sqlserver://localhost;databaseName=TestDB

spring.datasource.username=nirmal

spring.datasource.password=Test123_

spring.datasource.driverClassName=com.microsoft.sqlserver.jdbc.SQLServerDriver

spring.jpa.database-platform=org.hibernate.dialect.SQLServer2012Dialect

server.port = 9090

spring.jpa.properties.hibernate.show_sql=true

spring.jpa.properties.hibernate.use_sql_comments=false

spring.jpa.properties.hibernate.format_sql=true

#jackrabbit configs

jackrabbit.username=admin

jackrabbit.userpassword=admin

jackrabbit.url=http://localhost:8080/jackrabbit-webapp-2.18.5/server

Then I will add spring boot startup class as  AppInitializer class with following content in "com.nirmal.JackrabbitSpringBoot.app" package.

package com.nirmal.JackrabbitSpringBoot.app;

    import javax.sql.DataSource;

    import org.springframework.beans.factory.annotation.Autowired;

    import org.springframework.boot.SpringApplication;

    import org.springframework.boot.autoconfigure.SpringBootApplication;

    import org.springframework.boot.builder.SpringApplicationBuilder;

    import org.springframework.boot.web.support.SpringBootServletInitializer;

    import org.springframework.context.annotation.ComponentScan;

/**

 * Spring Boot initialization class of the JackrabbitSpringBoot project

 *

 * @author Nirmal Balasooriya

 *

 */

//@EnableJpaRepositories("com.nirmal.springbootrest")

@SpringBootApplication(scanBasePackages = { "com.nirmal.JackrabbitSpringBoot.app" })

@ComponentScan({"com.nirmal.JackrabbitSpringBoot.app"})

public class AppInitializer extends SpringBootServletInitializer {

    @Autowired

    DataSource dataSource;

    @Override

    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {

        return application.sources(AppInitializer.class);

    }

    public static void main(String[] args) {

        SpringApplication.run(AppInitializer.class, args);

    }

}

Next Lets add the Controller. In my controller it will have two API methods call "getImage" and "uploadResource". Both will take both will take path variable call "resourceName". (This is image name without extension). Full controller will be as below.

package com.nirmal.JackrabbitSpringBoot.app;

import org.apache.tika.io.IOUtils;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.core.io.ClassPathResource;

import org.springframework.core.io.Resource;

import org.springframework.http.MediaType;

import org.springframework.stereotype.Component;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.ResponseBody;

import org.springframework.beans.factory.annotation.Value;

import javax.jcr.*;

import org.apache.jackrabbit.commons.JcrUtils;

import java.io.InputStream;

@Controller

@Component

public class MainController {

    Logger logger = LoggerFactory.getLogger(MainController.class);

    @Value("${jackrabbit.username}")

    private String username;

    @Value("${jackrabbit.userpassword}")

    private String userPassword;

    @Value("${jackrabbit.url}")

    private String jackrabbitUrl;

    @GetMapping("/uploadResource/{resourceName}")

    @ResponseBody

    public Response uploadResource(@PathVariable("resourceName")String resourceName) throws Exception {

        logger.info("Upload resource resourceName : " + resourceName);

        JackRabitResource jackRabitResource=new JackRabitResource();

        resourceName=resourceName+".jpg";

        Response<JackRabitResource> response = new Response<JackRabitResource>("0", "Resource does not exist", null);

        if (new ClassPathResource(resourceName).exists()){

            uploadFile(resourceName);

            response = new Response<JackRabitResource>("1", "Resource Added Successfully", jackRabitResource);

        }

        return response;

    }

    @GetMapping(

            value = "/getImage/{resourceName}",

            produces = MediaType.IMAGE_JPEG_VALUE

    )

    public @ResponseBody byte[] getImage(@PathVariable("resourceName")String resourceName) throws Exception {

        logger.info("Get Image resourceName : " + resourceName);

        resourceName=resourceName+".jpg";

        if (new ClassPathResource(resourceName).exists()){

            try {

                return getContent(resourceName);

            }catch (PathNotFoundException e){

                return null;

            }

        }

        return null;

    }

    public void uploadFile(String name) throws Exception{

        Repository repository = JcrUtils.getRepository(jackrabbitUrl);

        Session session = repository.login(

                new SimpleCredentials(username, userPassword.toCharArray()));

        try{

            Resource resource = new ClassPathResource(name);

            InputStream stream = resource.getInputStream();

            Node folder = session.getRootNode();

            Node file = folder.addNode(name,"nt:file");

            Node content = file.addNode("jcr:content","nt:resource");

            Binary binary = session.getValueFactory().createBinary(stream);

            content.setProperty("jcr:data",binary);

            content.setProperty("jcr:mimeType","image/gif");

            session.save();

        }finally{

            session.logout();

        }

    }

    public byte[] getContent(String name) throws Exception{

        Repository repository = JcrUtils.getRepository(jackrabbitUrl);

        Session session = repository.login(

                new SimpleCredentials(username, userPassword.toCharArray()));

        Node folder = session.getRootNode();

        Node file=folder.getNode(name);

        Node content=file.getNode("jcr:content");

        String path = content.getPath();

        Binary bin = session.getNode(path).getProperty("jcr:data").getBinary();

        InputStream stream = bin.getStream();

        return IOUtils.toByteArray(stream);

    }

}

For testing purposes I will put two jpg images in resource folder so after all there you could see similar project structure as below figure.

Final project structure 

Lets run the applciation

You can perform maven install command on the project and then you can run the application by following command in target folder. Make sure that JBoss EAP which we deployed jackrabbit server running while you are testing.

java -jar JackrabbitSpringBoot-1.0-SNAPSHOT.jar

Once application successfully started you could see similar console output as show below.

Also you should be able to access following URL from browser http://localhost:9090/getImage/srilanka and should get following output on web browser.

Then lets try to upload two images in to jackrabbit repository which I added in side the resource folder. You can brows following URL and should able to get respective outputs as well.

http://localhost:9090/uploadResource/colombo

http://localhost:9090/uploadResource/srilanka

Since both resources "srilanka.jpg" and "colombo.jpg" available in resources folder both occasions it will return following output.

{"code":"1","desc":"Resource Added Successfully","t":null}

In case if you try to access not available resource as below.

http://localhost:9090/uploadResource/corona

{"code":"0","desc":"Resource does not exist","t":null}

So now we can access our jackrabit repository from following URL and see whether resources are uploaded.

http://localhost:8080/jackrabbit-webapp-2.18.5/repository/default/

You should be able to see as following 

Then lets try to access resources in Jackrabbit repository. for respective URLs should return similar output as show below.

http://localhost:9090/getImage/srilanka

Retrieving image from repository

http://localhost:9090/getImage/colombo

Retrieving image from repository

You can find the code base related to this project from following FITHUB location.