No suitable driver found for jdbc:mysql://localhost

Question

I am new to Groovy & Grails, facing this issue. I have been trying to connect mysql to GGTS facing below issue.

GGTS 3.5.1 Grails 2.3.7 Mysql 5.6.19

1. I added dependencies in Buildconfig.groovy, had jar in .m2 repository 2.Tried adding jar in grails-app/lib 3.Tried to add @grab, but faced error, "no system classloader' 4.I am able to use the same url in java/eclipse and able to connect.

Error description displayed in console

|Environment set to development
.................................
|Packaging Grails application
........................................
|Running Grails application
|Server running. Browse to http://localhost:8080/Hello
....Error 
|
2014-06-15 00:28:44,903 [http-bio-8080-exec-7] ERROR errors.GrailsExceptionResolver  - SQLException occurred when processing request: [GET] /Hello/book/index
No suitable driver found for jdbc:mysql://localhost/ot. Stacktrace follows:
Message: No suitable driver found for jdbc:mysql://localhost/ot
    Line | Method
->>  596 | getConnection in java.sql.DriverManager
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    215 | getConnection in     ''
|     12 | index . . . . in hello.BookController
|    200 | doFilter      in grails.plugin.cache.web.filter.PageFragmentCachingFilter
|     63 | doFilter . .  in grails.plugin.cache.web.filter.AbstractFilter
|   1145 | runWorker     in java.util.concurrent.ThreadPoolExecutor
|    615 | run . . . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^    744 | run           in java.lang.Thread

my datasource.groovy

dataSource {
    pooled = true
    driverClassName = "com.mysql.jdbc.Driver"
    dialect = 'org.hibernate.dialect.MySQL5InnoDBDialect'

}
hibernate {
    cache.use_second_level_cache = true
    cache.use_query_cache = false
//    cache.region.factory_class = 'net.sf.ehcache.hibernate.EhCacheRegionFactory' // Hibernate 3
    cache.region.factory_class = 'org.hibernate.cache.ehcache.EhCacheRegionFactory' // Hibernate 4
}

// environment specific settings
environments {
    development {
        dataSource {
            username = "root"
            password = "lenovo"
            dbCreate = "update"
            url = "jdbc:mysql://localhost/ot"

        }
    }

Buildconfig.groovy

dependencies {
        // specify dependencies here under either 'build', 'compile', 'runtime',     'test' or 'provided' scopes e.g.
            runtime 'mysql:mysql-connector-java:5.1.30'
          // runtime 'org.postgresql:postgresql:9.3-1100-jdbc41'
         }

controller

def index() {

conn = Sql.newInstance("jdbc:mysql://localhost/ot",
                      "root",
                      "lenovo",
                      "com.mysql.jdbc.Driver")
                    //  "org.gjt.mm.mysql.Driver")

conn.rows('select NAME, ROLLNO from student').each{ 
    println "${it.NAME} ${it.ROLLNO}"

Please suggest. Thanks for your support in advance.

Answer 1

The error is explicitly telling you that you need to add the mysql JDBC connector JAR to your classpath.

It is available here .

Answer 2

Probably different classloader loads jars and different is used in controller. As proposed here: Grails sql queries create you Sql instance from injected dataSource instead of Sql.newInstance()

Still you should consider defining a Domain class and access the database with GORM.

hope this helps, droggo