Links
Setting
- JRE_HOME=C:\sdk\Java\jre_1.8.0_65
- JAVA_HOME=C:\sdk\Java\jdk_1.8.0_65
- JDK_HOME=C:\sdk\Java\jdk_1.8.0_65
Maven
wget https://www-us.apache.org/dist/maven/maven-3/3.6.3/binaries/apache-maven-3.6.3-bin.tar.gz
sudo tar xzf apache-maven-3.6.3-bin.tar.gz
sudo ln -s apache-maven-3.6.3 maven
sudo vi /etc/profile.d/maven.sh
-------------------------------------
export MAVEN_HOME=/opt/maven
export PATH=${MAVEN_HOME}/bin:${PATH}
-------------------------------------
source /etc/profile.d/maven.sh
mvn -version
Code-Collections
import java.util.concurrent.TimeUnit;
---------------------------------------------
try {
TimeUnit.SECONDS.sleep(secondsToSleep);
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
}
---------------------------------------------
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import io.agroal.api.AgroalDataSource;
public class SettingDatabase{
AgroalDataSource dataSource;
String db = "jdbc:db2://localhost:5245/DATABASE:user=db2;password=db2;";
String sql = "SELECT * FROM users";
public void init_DriverManager()throws SQLException{
try{
Connection connection = DriverManager.getConnection(db); //Connection connection = AgroalDataSource.getConnection(db);
PreparedStatement ps = connection.prepareStatement(sql);
ResultSet rs = ps.executeQuery();
}
}
}
Architekture
Database
- JDBC is a low level standard for interaction with databases. JPA is higher level standard for the same purpose.
- JDBC allows you to do more things with the Database directly. JPA allows you to use an object model in your application.
- Datasource & Pooling (JDBC) >> Agroal
- Datasource & Pooling (Reactive) >> Vert.x
- Agroal is a datasource connection pool implementation with integration with transaction, security and other systems.
- Agroal library allows the definition of java.sql.DataSource with connection pooling.
- JPA (Java Persistence API) & Hibernate ORM (Object-relational mapping). JPA is only a specification. Hibernate is an implementation of JPA.
RESTFul
- RESTEasy is an implementation of JAX-RS and it is used to implement RestFul-services.
- Microservices communicating either synchronously via REST or asynchronously using Kafka.
Sprin Boot
Quarkus
ref: Roadmap
ref: Colletions
docker pull maven:3.6-jdk-11-slim
Startup
mvn "io.quarkus:quarkus-maven-plugin:1.12.2.Final:create"
------------------------------------------------------------
mvn "io.quarkus:quarkus-maven-plugin:1.12.2.Final:create" \
-DprojectGroupId="net.condolco" \
-DprojectArtifactId="quarkus-app-00" \
-DclassName="init.SayHello" \
-Dpath="/hello" \
-Dextensions="resteasy,resteasy-jackson"
mvn quarkus:dev
mvn quarkus:list-extensions
mvn quarkus:add-extension -Dextensions="hibernate-validator"
mvn quarkus:add-extension -Dextensions="hibernate-*"
mvn quarkus:list-extensions
## mode: jvm
mvn clean package -DskipTests
java -jar target/tutorial-app-1.0-SNAPSHOT-runner.jar
## mode: native
mvn clean package -DskipTests -Pnative
./target/tutorial-app-1.0-SNAPSHOT-runner
## mode: native contianer
mvn package -DskipTests -Pnative -Dquarkus.native.container-build=true
docker build -f src/main/docker/Dockerfile.native -t example/tutorial-app:1.0-SNAPSHOT .
docker run -it --rm -p 8080:8080 example/tutorial-app:1.0-SNAPSHOT
