Read application properties from env first and add Docker configuration.

.github/workflows/build-and-deploy.yml

@@ -60,7 +60,7 @@ jobs:
           ./gradlew --version
           ./gradlew build
 
-          docker cp app/build/libs/app-1.0.war tomcat:/usr/local/tomcat/webapps/vss.war
+          docker cp app/build/libs/vss-1.0.war tomcat:/usr/local/tomcat/webapps/vss.war
 
       - name: Hit endpoint to verify service is up
         run: |

Dockerfile

@@ -0,0 +1,12 @@
+# Use official Tomcat base image
+FROM tomcat:jre17
+
+# Copy WAR file
+COPY app/build/libs/vss-1.0.war /usr/local/tomcat/webapps/vss.war
+
+ENV vss.jdbc.url="jdbc:postgresql://postgres:5432/postgres"
+ENV vss.jdbc.username=postgres
+ENV vss.jdbc.password=YOU_MUST_CHANGE_THIS_PASSWORD
+
+EXPOSE 8080
+CMD ["catalina.sh", "run"]

app/build.gradle

@@ -30,6 +30,10 @@ idea {
 group 'org.vss'
 version '1.0'
 
+war {
+  archiveFileName = "vss-${project.version}.war"
+}
+
 dependencies {
   implementation "com.google.protobuf:protobuf-java:$protobufVersion"
 

app/src/main/java/org/vss/guice/BaseModule.java

@@ -52,38 +52,48 @@ class HikariCPDataSource {
 
   static {
     try (InputStream input = HikariCPDataSource.class.getClassLoader()
-        .getResourceAsStream("hikariJdbc.properties")) {
-      Properties hikariJdbcProperties = new Properties();
-      hikariJdbcProperties.load(input);
+        .getResourceAsStream("application.properties")) {
+      Properties applicationProperties = new Properties();
+      applicationProperties.load(input);
 
-      config.setJdbcUrl(hikariJdbcProperties.getProperty("jdbc.url"));
-      config.setUsername(hikariJdbcProperties.getProperty("jdbc.username"));
-      config.setPassword(hikariJdbcProperties.getProperty("jdbc.password"));
+      config.setJdbcUrl(getEnvOrConfigProperty("vss.jdbc.url", applicationProperties));
+      config.setUsername(getEnvOrConfigProperty("vss.jdbc.username", applicationProperties));
+      config.setPassword(getEnvOrConfigProperty("vss.jdbc.password", applicationProperties));
 
       config.setMaximumPoolSize(
-          Integer.parseInt(hikariJdbcProperties.getProperty("hikaricp.maxPoolSize")));
+          Integer.parseInt(getEnvOrConfigProperty("vss.hikaricp.maxPoolSize", applicationProperties)));
       config.setMinimumIdle(
-          Integer.parseInt(hikariJdbcProperties.getProperty("hikaricp.minimumIdle")));
+          Integer.parseInt(getEnvOrConfigProperty("vss.hikaricp.minimumIdle", applicationProperties)));
       config.setConnectionTimeout(
-          Long.parseLong(hikariJdbcProperties.getProperty("hikaricp.connectionTimeout")));
+          Long.parseLong(getEnvOrConfigProperty("vss.hikaricp.connectionTimeout", applicationProperties)));
       config.setIdleTimeout(
-          Long.parseLong(hikariJdbcProperties.getProperty("hikaricp.idleTimeout")));
+          Long.parseLong(getEnvOrConfigProperty("vss.hikaricp.idleTimeout", applicationProperties)));
       config.setMaxLifetime(
-          Long.parseLong(hikariJdbcProperties.getProperty("hikaricp.maxLifetime")));
+          Long.parseLong(getEnvOrConfigProperty("vss.hikaricp.maxLifetime", applicationProperties)));
 
       config.addDataSourceProperty("cachePrepStmts",
-          hikariJdbcProperties.getProperty("hikaricp.cachePrepStmts"));
+          getEnvOrConfigProperty("vss.hikaricp.cachePrepStmts", applicationProperties));
       config.addDataSourceProperty("prepStmtCacheSize",
-          hikariJdbcProperties.getProperty("hikaricp.prepStmtCacheSize"));
+          getEnvOrConfigProperty("vss.hikaricp.prepStmtCacheSize", applicationProperties));
       config.addDataSourceProperty("prepStmtCacheSqlLimit",
-          hikariJdbcProperties.getProperty("hikaricp.prepStmtCacheSqlLimit"));
+          getEnvOrConfigProperty("vss.hikaricp.prepStmtCacheSqlLimit", applicationProperties));
 
       dataSource = new HikariDataSource(config);
     } catch (IOException e) {
-      throw new RuntimeException("Unable to read hikariJdbcProperties from resources");
+      throw new RuntimeException("Unable to read application.properties from resources");
     }
   }
 
+  // Retrieves the value of a specified property, first checking environment variables,
+  // then falling back to provided configuration properties if the environment variable is not set.
+  private static String getEnvOrConfigProperty(String key, Properties hikariJdbcProperties) {
+    String propertyValue = System.getenv(key);
+    if (StringUtils.isBlank(propertyValue)) {
+      propertyValue = hikariJdbcProperties.getProperty(key);
+    }
+    return propertyValue;
+  }
+
   private HikariCPDataSource() {
   }
 }

app/src/main/resources/application.properties

@@ -0,0 +1,26 @@
+# Application Properties File
+# Contains default application properties, these are meant to be changed according to application needs.
+# Each property can be overridden by setting an environment variable with the same name.
+# For example, to override 'vss.jdbc.url', set an environment variable 'vss.jdbc.url' with the new value.
+
+vss.jdbc.url=jdbc:postgresql://localhost:5432/postgres
+vss.jdbc.username=postgres
+vss.jdbc.password=YOU_MUST_CHANGE_THIS_PASSWORD
+
+# Idle Timeout
+vss.hikaricp.minimumIdle=10
+
+# Set connectionTimeout to 30 secs
+vss.hikaricp.connectionTimeout=30000
+
+# Set idle timeout to 10 minutes
+vss.hikaricp.idleTimeout=600000
+
+# Set Maximum lifetime of a connection to 30minutes
+vss.hikaricp.maxLifetime=1800000
+
+# Performance Optimizations
+vss.hikaricp.maxPoolSize=50
+vss.hikaricp.cachePrepStmts=true
+vss.hikaricp.prepStmtCacheSize=250
+vss.hikaricp.prepStmtCacheSqlLimit=2048

docker-compose.yml

@@ -0,0 +1,33 @@
+version: '3.8'
+services:
+  postgres:
+    image: postgres:15
+    environment:
+      POSTGRES_DB: postgres
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: YOU_MUST_CHANGE_THIS_PASSWORD
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+      - ./app/src/main/java/org/vss/impl/postgres/sql/v0_create_vss_db.sql:/docker-entrypoint-initdb.d/init.sql
+    ports:
+      - "5432:5432"
+    networks:
+      - app-network
+
+  tomcat:
+    build:
+      context: .
+    container_name: tomcat
+    depends_on:
+      - postgres
+    ports:
+      - "8080:8080"
+    networks:
+      - app-network
+
+volumes:
+  postgres-data:
+
+networks:
+  app-network:
+    driver: bridge