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    <p>I ended up writing a groovy script that tests connection to MySQL. The code follows. Place it in <strong>scripts/TestMysql.groovy</strong> and run e.g. as </p> <pre><code>grails test test-mysql localhost 3306 test-db grails-user grails-password </code></pre> <p>The first "test" is to run the script in the test environment, in case there are any changes in DataSource.groovy. </p> <p>If you can connect to MySQL with this script, at the very least you will know the correct settings for your DataSource.groovy. In case of success it also prints the relevant <code>dataSource {}</code> section to be inserted into <code>DataSource.groovy</code>.</p> <pre><code>/* Testing grails/GORM connection to mysql * Call this script "scripts/TestMysql.groovy" * Usage: "grails test-mysql" or, to run in another environment, e.g. "grails test test-mysql" * (This is in case you have changed DataSource.groovy and nothing is working.) * * Up to five parameters: * grails test test-mysql &lt;host&gt; &lt;port&gt; &lt;database&gt; &lt;user&gt; &lt;password&gt; * e.g. grails test test-mysql localhost 3306 test root rootpassword. * The database name can also be empty. */ import groovy.sql.Sql includeTargets &lt;&lt; grailsScript("_GrailsInit") &lt;&lt; grailsScript("_GrailsArgParsing") target(main: "The description of the script goes here!") { def list=argsMap['params'] def host=list[0] ? list[0] : 'localhost' def port=list[1] ? list[1] : '3306' def db=list[2] ? list[2] : '' // can leave empty def user=list[3] ? list[3] : 'grails' def pswd=list[4] ? list[4] : 'grails' println "Connecting to " + host + ":" + port println "Database:" + db println "User: " + user println "Password: " + pswd def jdbc_string='jdbc:mysql://' + host + ':' + port + '/' + db def sql try { sql = Sql.newInstance(jdbc_string, user, pswd, "com.mysql.jdbc.Driver") } catch (com.mysql.jdbc.exceptions.jdbc4.CommunicationsException e) { println "ERROR! Cannot connect to " + host + ":" + port println "Check host, port, your open ports and other firewall settings; try to connect with some other program" println "" println e return } catch (com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException e) { println "MySQL ERROR, perhaps wrong database name!" println "" println e return } catch (java.sql.SQLException e) { println "MySQL ERROR, perhaps wrong login/password!" println "" println e return } println "SUCCESS! Connected to MySQL" def query = "SHOW DATABASES" println "Executing query " + query + "..." sql.eachRow(query) { println it } println "OK, Done!" println """ dataSource { dbCreate = "create-drop" // one of 'create', 'create-drop', 'update', 'validate', '' url = "jdbc:mysql://${host}:${port}/${db}" username="${user}" password="${pswd}" } """ } setDefaultTarget(main) </code></pre> <p><strong>Update</strong>: indeed, once this script was working, it was easy to make Grails work as well. I just had to do <code>grails clean</code>, delete all <code>*.class</code> files that survived, restore the original <code>DataSource.groovy</code>, and then <code>grails compile --refresh-dependencies</code>. Then change <code>DataSource.groovy</code>, and it works like a charm.</p> <p>Here is my working <code>DataSource.groovy</code>:</p> <pre><code>dataSource { pooled = true driverClassName = "com.mysql.jdbc.Driver" username = "sa" password = "" } hibernate { cache.use_second_level_cache = true cache.use_query_cache = false cache.region.factory_class = 'net.sf.ehcache.hibernate.EhCacheRegionFactory' } // environment specific settings environments { development { dataSource { dbCreate = "create-drop" // one of 'create', 'create-drop', 'update', 'validate', '' url = "jdbc:mysql://localhost:8890/test" username="grails" password="grails" } } test { dataSource { dbCreate = "update" url = "jdbc:h2:mem:testDb;MVCC=TRUE;LOCK_TIMEOUT=10000" } } production { dataSource { dbCreate = "update" url = "jdbc:h2:prodDb;MVCC=TRUE;LOCK_TIMEOUT=10000" pooled = true properties { maxActive = -1 minEvictableIdleTimeMillis=1800000 timeBetweenEvictionRunsMillis=1800000 numTestsPerEvictionRun=3 testOnBorrow=true testWhileIdle=true testOnReturn=true validationQuery="SELECT 1" } } } } </code></pre>
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