如何使 MySQL 在 grails 2.0 上运行
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【中文标题】如何使 MySQL 在 grails 2.0 上运行【英文标题】：How to make MySQL work on grails 2.0 【发布时间】：2012-02-11 23:57:12 【问题描述】：Grails 2.0 似乎对DataSource.groovy 进行了一些更改，我似乎无法像在 1.3.7 中那样运行 mysql
我做了grails install-dependency mysql:mysql-connector-java:5.1.16 而不仅仅是将.jar 转储到lib 中。我听说这就是这几天的做法。
这是我在DataSource.groovy 中替换的内容：
driverClassName = "org.h2.Driver"
...
url = "jdbc:h2:mem:devDb;MVCC=TRUE"
有
driverClassName = "com.mysql.jdbc.Driver"
...
url = "jdbc:mysql://localhost:3306/$dbNamer?autoreconnect=true"
当然将用户名、密码和 dbNamer 更改为有效条目...我做错了什么？是否有涵盖设置 mysql 的 grails 2.0 教程？
我得到这个怪物错误：
| Loading Grails 2.0.0
| Configuring classpath.
| Environment set to development.....
| Packaging Grails application.....
| Compiling 1 source files.....
| Running Grails application
| Error 2012-01-16 21:39:10,134 [Thread-9] ERROR context.GrailsContextLoader - Error executing bootstraps: Error creating bean with name 'transactionManagerPostProcessor': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'hibernateProperties' while setting bean property 'hibernateProperties'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateProperties': Cannot resolve reference to bean 'dialectDetector' while setting bean property 'properties' with key [hibernate.dialect]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dialectDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver'
Message: Error creating bean with name 'transactionManagerPostProcessor': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'hibernateProperties' while setting bean property 'hibernateProperties'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateProperties': Cannot resolve reference to bean 'dialectDetector' while setting bean property 'properties' with key [hibernate.dialect]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dialectDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver'
Line | Method
->> 334 | innerRun in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 166 | run in java.util.concurrent.FutureTask
| 1110 | runWorker in java.util.concurrent.ThreadPoolExecutor
| 603 | run in java.util.concurrent.ThreadPoolExecutor$Worker
^ 679 | run . . . in java.lang.Thread
Caused by BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'hibernateProperties' while setting bean property 'hibernateProperties'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateProperties': Cannot resolve reference to bean 'dialectDetector' while setting bean property 'properties' with key [hibernate.dialect]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dialectDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver'
->> 334 | innerRun in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 166 | run in java.util.concurrent.FutureTask
| 1110 | runWorker in java.util.concurrent.ThreadPoolExecutor
| 603 | run in java.util.concurrent.ThreadPoolExecutor$Worker
^ 679 | run . . . in java.lang.Thread
Caused by BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'hibernateProperties' while setting bean property 'hibernateProperties'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateProperties': Cannot resolve reference to bean 'dialectDetector' while setting bean property 'properties' with key [hibernate.dialect]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dialectDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver'
->> 334 | innerRun in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 166 | run in java.util.concurrent.FutureTask
| 1110 | runWorker in java.util.concurrent.ThreadPoolExecutor
| 603 | run in java.util.concurrent.ThreadPoolExecutor$Worker
^ 679 | run . . . in java.lang.Thread
Caused by BeanCreationException: Error creating bean with name 'hibernateProperties': Cannot resolve reference to bean 'dialectDetector' while setting bean property 'properties' with key [hibernate.dialect]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dialectDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver'
->> 334 | innerRun in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 166 | run in java.util.concurrent.FutureTask
| 1110 | runWorker in java.util.concurrent.ThreadPoolExecutor
| 603 | run in java.util.concurrent.ThreadPoolExecutor$Worker
^ 679 | run . . . in java.lang.Thread
Caused by BeanCreationException: Error creating bean with name 'dialectDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver'
->> 334 | innerRun in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 166 | run in java.util.concurrent.FutureTask
| 1110 | runWorker in java.util.concurrent.ThreadPoolExecutor
| 603 | run in java.util.concurrent.ThreadPoolExecutor$Worker
^ 679 | run . . . in java.lang.Thread
Caused by MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver'
->> 334 | innerRun in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 166 | run in java.util.concurrent.FutureTask
| 1110 | runWorker in java.util.concurrent.ThreadPoolExecutor
| 603 | run in java.util.concurrent.ThreadPoolExecutor$Worker
^ 679 | run . . . in java.lang.Thread
Caused by SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver'
->> 1429 | createConnectionFactory in org.apache.commons.dbcp.BasicDataSource
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 1371 | createDataSource in ''
| 1044 | getConnection in ''
| 334 | innerRun in java.util.concurrent.FutureTask$Sync
| 166 | run . . . in java.util.concurrent.FutureTask
| 1110 | runWorker in java.util.concurrent.ThreadPoolExecutor
| 603 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^ 679 | run in java.lang.Thread
Caused by ClassNotFoundException: com.mysql.jdbc.Driver
->> 217 | run in java.net.URLClassLoader$1
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 205 | findClass in java.net.URLClassLoader
| 321 | loadClass in java.lang.ClassLoader
| 266 | loadClass in ''
| 1420 | createConnectionFactory in org.apache.commons.dbcp.BasicDataSource
| 1371 | createDataSource in ''
| 1044 | getConnection in ''
| 334 | innerRun in java.util.concurrent.FutureTask$Sync
| 166 | run . . . in java.util.concurrent.FutureTask
| 1110 | runWorker in java.util.concurrent.ThreadPoolExecutor
| 603 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^ 679 | run in java.lang.Thread
【问题讨论】：
【参考方案1】：install-dependency 只需下载 jar 并将其放入您的 Ivy 缓存中。但是您还没有声明您的应用程序依赖于该 jar。 BuildConfig.groovy 有一个 MySQL 驱动程序的注释掉依赖声明。只需取消注释并根据需要更新版本，它就会将其添加到应用程序的类路径中。如果您没有使用install-dependency 这样做，它还会将 jar 下载到您的 Ivy 缓存中。
【讨论】：
我是不是忘记了之前必须这样做，或者依赖项是 2.0 中的新内容？还是因为我做了install-dependency 而不是丢罐子？
自 1.2 以来一直存在。就像我说的，install-dependency 是一个全局的东西——它只是下载 jar 并缓存它，但对当前的应用程序没有影响。见grails.org/doc/latest/ref/Command%20Line/…【参考方案2】：
我刚刚做了一个 grails>clean 并且成功了
【讨论】：
它也对我有用。该命令类似于 app_name>grails clean 是的，完全为我工作，无需更改 BuildConfig.groovy 我在将 jar 直接放入libs 而不是 install-dependency 时遇到了同样的问题。这对我有用
不过，“grails clean”似乎对从 DataSource.groovy 和 BuildConfig.groovy 编译的 *.class 文件没有影响。 （我不知道这些文件是什么时候创建的。）但是使用 groovyc 手动删除和/或重新编译它们是可行的！【参考方案3】：
我最终编写了一个测试与 MySQL 的连接的 groovy 脚本。代码如下。将它放在 scripts/TestMysql.groovy 并运行例如作为
grails test test-mysql localhost 3306 test-db grails-user grails-password
第一个“测试”是在测试环境中运行脚本，以防DataSource.groovy有任何变化。
如果您可以使用此脚本连接到 MySQL，那么您至少会知道 DataSource.groovy 的正确设置。如果成功，它还会打印相关的dataSource 部分以插入DataSource.groovy。
/* 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 <host> <port> <database> <user> <password>
* e.g. grails test test-mysql localhost 3306 test root rootpassword.
* The database name can also be empty.
*/
import groovy.sql.Sql
includeTargets << grailsScript("_GrailsInit") << 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)
更新：确实，一旦这个脚本运行起来，就很容易让 Grails 也运行起来。我只需要做grails clean，删除所有幸存的*.class文件，恢复原来的DataSource.groovy，然后grails compile --refresh-dependencies。然后更改DataSource.groovy，它就像一个魅力。
这是我的工作DataSource.groovy：
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"
【讨论】：
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