starting and stopping hsqldb from unit tests

Question

I'm trying to create integration tests using hsqldb in an in memory mode. At the moment, I have to start the hsqldb server from the command line before running the unit tests. I would like to be able to control the hsqldb server from my integration tests. I can't seem to get this to all work out though from code.

Update:

This appears to work along with having a hibernate.cfg.xml file in the classpath:

org.hsqldb.Server.main(new String[]{});

and in my hibernate.cfg.xml file:

<property name="connection.driver_class">org.hsqldb.jdbcDriver</property>
<property name="connection.url">jdbc:hsqldb:mem:ww</property>
<property name="connection.username">sa</property>
<property name="connection.password"></property>
<property name="connection.pool_size">1</property>
<property name="dialect">org.hibernate.dialect.HSQLDialect</property>
<property name="current_session_context_class">thread</property>
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<property name="hbm2ddl.auto">update</property>

Update It appears that this is only a problem when running the unit tests from within Eclipse using jUnit and the built in test runner. If I run

 mvn test

they are executed correctly and there is no exception. Am I missing something as far as a dependency goes? I have generated the eclipse project using

mvn eclipse:eclipse

and my pom is:

<?xml version="1.0" encoding="UTF-8"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>

<groupId>com.myproject</groupId>
<artifactId>myproject</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>

<name>myproject</name>

<dependencies>
    <dependency>
        <groupId>jstl</groupId>
        <artifactId>jstl</artifactId>
        <version>1.1.2</version>
    </dependency>
    <dependency>
        <groupId>taglibs</groupId>
        <artifactId>standard</artifactId>
        <version>1.1.2</version>
    </dependency>

    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>3.3.2.GA</version>
    </dependency>
    <dependency>
        <groupId>com.oracle</groupId>
        <artifactId>ojdbc14</artifactId>
        <version>10.1.0.4.0</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.6.0</version>
    </dependency>

    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-simple</artifactId>
        <version>1.6.0</version>
    </dependency>
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.14</version>
    </dependency>
    <dependency>
        <groupId>javassist</groupId>
        <artifactId>javassist</artifactId>
        <version>3.8.0.GA</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-annotations</artifactId>
        <version>3.4.0.GA</version>
    </dependency>

    <!-- Test Dependencies -->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.8.1</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.easymock</groupId>
        <artifactId>easymock</artifactId>
        <version>3.0</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>hsqldb</groupId>
        <artifactId>hsqldb</artifactId>
        <version>1.8.0.1</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.mortbay.jetty</groupId>
        <artifactId>jetty-servlet-tester</artifactId>
        <version>6.1.24</version>
        <scope>test</scope>
    </dependency>


    <!-- Provided -->
    <dependency>
        <groupId>org.apache.tomcat</groupId>
        <artifactId>servlet-api</artifactId>
        <version>6.0.26</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.apache.tomcat</groupId>
        <artifactId>jsp-api</artifactId>
        <version>6.0.26</version>
    </dependency>

</dependencies>

<build>
    <finalName>ww_main</finalName>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>1.6</source>
                <target>1.6</target>
            </configuration>
        </plugin>

        <plugin>
            <groupId>org.mortbay.jetty</groupId>
            <artifactId>maven-jetty-plugin</artifactId>
        </plugin>
    </plugins>
</build>
<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

Update Ok, well not sure what exactly was going wrong here, but I seemed to have fixed it. I deleted all the files that HSQLDB created, as well as all of the created files in my Maven target folder, did a clean, recreated my eclipse .project using maven and refreshed the project in eclipse. I think I may have had something left over from a previous configuration that was throwing it off.

Thanks for everyone's help!

Solution 1

I use the following configuration (directly inspired by the Hibernate tutorial) without any problem:

<hibernate-configuration>
  <session-factory>

    <!-- Database connection settings -->
    <property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver"/>
    <property name="hibernate.connection.url" value="jdbc:hsqldb:mem:foobar"/>
    <property name="hibernate.connection.username" value="sa"/>
    <property name="hibernate.connection.password" value=""/>

    <!-- JDBC connection pool (use the built-in) -->
    <property name="connection.pool_size">1</property>

    <!-- SQL dialect -->
    <property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/>

    <!-- Enable Hibernate's automatic session context management -->
    <property name="current_session_context_class">thread</property>

    <!-- Disable the second-level cache  -->
    <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

    <!-- Echo all executed SQL to stdout -->
    <property name="show_sql">true</property>

    <!-- Drop and re-create the database schema on startup -->
    <property name="hibernate.hbm2ddl.auto" value="update"/>

    <mapping resource="..."/>

  </session-factory>
</hibernate-configuration>

When using an in-memory HSQLDB, there is no need to start anything explicitly. Just use the mem: protocol and the in-memory database will get started from JDBC.

See also

• Unit-Testing Hibernate With HSQLDB

Solution 2

Try appending this to the jdbc url:

;ifexists=true;shutdown=true;

Solution 3

In your shutdown method just do

Statement st = conn.createStatement();
st.execute("SHUTDOWN");
conn.close();