BAEL-3091: The Prototype Pattern in Java (changed code based on valid comments from a reader)

persistence-modules/liquibase/README.md

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+### Relevant Articles:
+- [Introduction to Liquibase Rollback](http://www.baeldung.com/liquibase-rollback)

persistence-modules/liquibase/pom.xml

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+<?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>
+    <artifactId>liquibase</artifactId>
+	<name>liquibase</name>
+
+    <parent>
+        <artifactId>parent-modules</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>../../</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>${mysql-connector-java.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>liquibase</finalName>
+        <plugins>
+            <plugin>
+                <groupId>org.liquibase</groupId>
+                <artifactId>liquibase-maven-plugin</artifactId>
+                <version>${liquibase-maven-plugin.version}</version>
+                <configuration>
+                    <propertyFile>liquibase/liquibase.properties</propertyFile>
+                    <changeLogFile>liquibase/db-changelog.xml</changeLogFile>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <mysql-connector-java.version>5.1.6</mysql-connector-java.version>
+        <liquibase-maven-plugin.version>3.4.2</liquibase-maven-plugin.version>
+    </properties>
+
+</project>

persistence-modules/liquibase/src/main/resources/liquibase/db-changelog.xml

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+<databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
+                        http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.4.xsd">
+
+    <changeSet id="testRollback" author="baeldung">
+        <createTable tableName="baeldung_tutorial">
+            <column name="id" type="int"/>
+            <column name="heading" type="varchar(36)"/>
+            <column name="author" type="varchar(36)"/>
+        </createTable>
+        <rollback>
+            <dropTable tableName="baeldung_tutorial"/>
+        </rollback>
+    </changeSet>
+
+    <changeSet id="multiStatementRollback" author="baeldung">
+        <createTable tableName="baeldung_tutorial2">
+            <column name="id" type="int"/>
+            <column name="heading" type="varchar(36)"/>
+            <column name="author" type="varchar(36)"/>
+        </createTable>
+        <createTable tableName="baeldung_tutorial3">
+            <column name="id" type="int"/>
+            <column name="heading" type="varchar(36)"/>
+            <column name="author" type="varchar(36)"/>
+        </createTable>
+        <rollback>
+            <dropTable tableName="baeldung_tutorial2"/>
+            <dropTable tableName="baeldung_tutorial3"/>
+        </rollback>
+    </changeSet>
+
+    <changeSet id="multipleRollbackTags" author="baeldung">
+        <createTable tableName="baeldung_tutorial4">
+            <column name="id" type="int"/>
+            <column name="heading" type="varchar(36)"/>
+            <column name="author" type="varchar(36)"/>
+        </createTable>
+        <createTable tableName="baeldung_tutorial5">
+            <column name="id" type="int"/>
+            <column name="heading" type="varchar(36)"/>
+            <column name="author" type="varchar(36)"/>
+        </createTable>
+        <rollback>
+            <dropTable tableName="baeldung_tutorial4"/>
+        </rollback>
+        <rollback>
+            <dropTable tableName="baeldung_tutorial5"/>
+        </rollback>
+    </changeSet>
+
+    <changeSet id="referChangeSetForRollback" author="baeldung">
+        <dropTable tableName="baeldung_tutorial2"/>
+        <dropTable tableName="baeldung_tutorial3"/>
+        <rollback changeSetId="multiStatementRollback" changeSetAuthor="baeldung"/>
+    </changeSet>
+
+    <changeSet id="emptyRollback" author="baeldung">
+        <createTable tableName="baeldung_tutorial6">
+            <column name="id" type="int"/>
+            <column name="heading" type="varchar(36)"/>
+            <column name="author" type="varchar(36)"/>
+        </createTable>
+        <rollback/>
+    </changeSet>
+
+
+</databaseChangeLog>

persistence-modules/liquibase/src/main/resources/liquibase/liquibase.properties

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+driver=com.mysql.jdbc.Driver
+url=jdbc:mysql://localhost:3306/baeldung_liquibase
+username=root
+password=password

persistence-modules/liquibase/src/main/resources/logback.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>