cleanup work

spring-security-mvc-persisted-remember-me/src/main/java/org/baeldung/spring/PersistenceConfig.java

@@ -0,0 +1,38 @@
+package org.baeldung.spring;
+
+import javax.sql.DataSource;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.core.env.Environment;
+import org.springframework.jdbc.datasource.DriverManagerDataSource;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+
+import com.google.common.base.Preconditions;
+
+/**
+ * Spring Database Configuration.
+ */
+@Configuration
+@EnableTransactionManagement
+@PropertySource({ "classpath:persistence-h2.properties" })
+public class PersistenceConfig {
+
+    @Autowired
+    private Environment env;
+
+    //
+
+    @Bean
+    public DataSource dataSource() {
+        final DriverManagerDataSource dataSource = new DriverManagerDataSource();
+        dataSource.setDriverClassName(Preconditions.checkNotNull(env.getProperty("jdbc.driverClassName")));
+        dataSource.setUrl(Preconditions.checkNotNull(env.getProperty("jdbc.url")));
+        dataSource.setUsername(Preconditions.checkNotNull(env.getProperty("jdbc.user")));
+        dataSource.setPassword(Preconditions.checkNotNull(env.getProperty("jdbc.pass")));
+        return dataSource;
+    }
+
+}