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    <p>I think the problem is that the database is getting locked. Let's try this one then (works on my experiment):</p> <p>edit your grails-app/conf/spring/resources.groovy and make it looking like this:</p> <pre><code>// Place your Spring DSL code here beans = { h2Server(org.h2.tools.Server, "-tcp,-tcpPort,8043") { bean -&gt; bean.factoryMethod = "createTcpServer" bean.initMethod = "start" bean.destroyMethod = "stop" } } </code></pre> <p>Then, modify your grails-app/conf/DataSource.groovy to look like this:</p> <pre><code>test { dataSource { dbCreate = "update" url = "jdbc:h2:mem:devDb;MVCC=TRUE;LOCK_TIMEOUT=10000" } } </code></pre> <p>Now, you are ready to add some new objects as per the tutorial:</p> <pre><code>$ grails grails&gt; run-app grails&gt; shell groovy:000&gt; new test.Book(title: 'Book 1').save(failOnError: true) ===&gt; test.Book : 1 groovy:000&gt; new test.Book(title: 'Book 2').save(failOnError: true) ===&gt; test.Book : 2 groovy:000&gt; test.Book.list() ===&gt; [test.Book : 1, test.Book : 2] </code></pre> <p>To view the H2 console, go to </p> <pre><code>http://localhost:8080/{project}/dbconsole </code></pre> <p>but select [Generic H2 Server] from the list and on the JDBC URL enter: </p> <pre><code>jdbc:h2:tcp://localhost:8043/mem:devDb </code></pre> <p>and connect. I hope that helps</p> <p>======================</p> <p>After a bit further experimentation, it appears that locking was your problem and you need to use a mixed mode approach when connecting to your H2. You can read more information here:</p> <p><a href="http://www.h2database.com/html/features.html#auto_mixed_mode">http://www.h2database.com/html/features.html#auto_mixed_mode</a></p> <p>So, the simplest thing to do is use this jdbc connection URL:</p> <pre><code>url = "jdbc:h2:/tmp/myDB;MVCC=TRUE;LOCK_TIMEOUT=10000;AUTO_SERVER=TRUE" </code></pre> <p>for both your application and the H2 dbconsole (notice the AUTO_SERVER=TRUE) (no need to modify the spring bean)</p>
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    1. USNick De Greek
    1. USNick De Greek
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    1. COhi Nick, I came to exactly the same conclusion while reading the, surprisingly clear, h2 docs; but didn't come to writing it down here yet. So thank you for your clear explanation which will surely help more users who will stumble upon this question. Have an upvote and accepted answer; well deserved
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