Add logging using Log4j2

SymphonyDatabaseNode/src/main/java/io/github/lumijiez/Main.java

@@ -1,13 +1,17 @@
 package io.github.lumijiez;
 
 import jakarta.persistence.EntityManager;
+import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.LogManager;
 
 public class Main {
+    public static Logger logger = LogManager.getLogger(Main.class);
+
     public static void main(String[] args) {
-        System.out.println("Node up");
+        logger.info("Node up.");
         EntityManager em = Data.getEntityManager();
 
-        System.out.println("Connected to DB << symphony >>");
+        logger.info("Connected to database: << symphony >>");
         em.close();
     }
 }

SymphonyDatabaseNode/src/main/resources/META-INF/persistence.xml

@@ -17,8 +17,6 @@
             <property name="jakarta.persistence.jdbc.user" value="symphony" />
             <property name="jakarta.persistence.jdbc.password" value="symphony" />
 
-            <property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect" />
-
             <property name="hibernate.c3p0.min_size" value="5"/>
             <property name="hibernate.c3p0.max_size" value="20"/>
             <property name="hibernate.c3p0.timeout" value="300"/>

SymphonyDatabaseNode/src/main/resources/log4j2.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration status="WARN">
+    <Appenders>
+        <Console name="Console" target="SYSTEM_OUT">
+            <PatternLayout>
+                <Pattern>%d{yyyy-MM-dd HH:mm:ss} [%t] %-5level: %msg%n</Pattern>
+            </PatternLayout>
+        </Console>
+    </Appenders>
+
+    <Loggers>
+        <Logger name="org.hibernate" level="off" additivity="false"/>
+        <Logger name="com.mchange" level="off" additivity="false"/>
+        <Logger name="com.mchange.v2" level="off" additivity="false"/>
+
+        <Root level="info">
+            <AppenderRef ref="Console"/>
+        </Root>
+    </Loggers>
+</Configuration>