我在这里找到了 grails 活动插件，并按照此文档开始使用此插件。
在安装插件后运行应用程序时出现以下错误
| Running Grails application
Activiti Process Engine with Spring Security Initialization ...
Activiti Process Engine Initialization...
Configuring Spring Security Core ...
... finished configuring Spring Security Core
| Error 2012-07-07 14:02:45,500 [pool-7-thread-1] ERROR context.GrailsContextLoader - Error executing bootstraps: Error creating bean with name 'transactionMana
erPostProcessor': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'tran
actionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.fac
ory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'hibernateProperties' while setting bean property 'hi
ernateProperties'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateProperties': Cannot resol
e reference to bean 'dialectDetector' while setting bean property 'properties' with key [hibernate.dialect]; nested exception is org.springframework.beans.factor
.BeanCreationException: Error creating bean with name 'dialectDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.M
taDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionF
ctory (Connection is broken: "java.net.ConnectException: Connection refused: connect: localhost" [90067-164])
Message: Error creating bean with name 'transactionManagerPostProcessor': Initialization of bean failed; nested exception is org.springframework.beans.factory.Be
nCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFac
ory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to be
n 'hibernateProperties' while setting bean property 'hibernateProperties'; nested exception is org.springframework.beans.factory.BeanCreationException: Error cre
ting bean with name 'hibernateProperties': Cannot resolve reference to bean 'dialectDetector' while setting bean property 'properties' with key [hibernate.dialec
]; 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.db
p.SQLNestedException: Cannot create PoolableConnectionFactory (Connection is broken: "java.net.ConnectException: Connection refused: connect: localhost" [90067-1
4])
Line | Method
->> 303 | innerRun in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 138 | run in java.util.concurrent.FutureTask
| 886 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker
| 908 | run in ''
^ 662 | run . . in java.lang.Thread
Caused by BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean propert
'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve re
erence to bean 'hibernateProperties' while setting bean property 'hibernateProperties'; nested exception is org.springframework.beans.factory.BeanCreationExcepti
n: Error creating bean with name 'hibernateProperties': Cannot resolve reference to bean 'dialectDetector' while setting bean property 'properties' with key [hib
rnate.dialect]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dialectDetector': Invocation of init
ethod failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apac
e.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Connection is broken: "java.net.ConnectException: Connection refused: connect: localh
st" [90067-164])
->> 303 | innerRun in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 138 | run in java.util.concurrent.FutureTask
| 886 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker
| 908 | run in ''
^ 662 | run . . in java.lang.Thread
Caused by BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'hibernateProperties' while setting bean proper
y '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.
actory.BeanCreationException: Error creating bean with name 'dialectDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.sup
ort.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConne
tionFactory (Connection is broken: "java.net.ConnectException: Connection refused: connect: localhost" [90067-164])
->> 303 | innerRun in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 138 | run in java.util.concurrent.FutureTask
| 886 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker
| 908 | run in ''
^ 662 | run . . in java.lang.Thread
Caused by BeanCreationException: Error creating bean with name 'hibernateProperties': Cannot resolve reference to bean 'dialectDetector' while setting bean prope
ty 'properties' with key [hibernate.dialect]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dialect
etector': 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 create PoolableConnectionFactory (Connection is broken: "java.net.ConnectException: Conne
tion refused: connect: localhost" [90067-164])
->> 303 | innerRun in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 138 | run in java.util.concurrent.FutureTask
| 886 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker
| 908 | run in ''
^ 662 | 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.
upport.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableCo
nectionFactory (Connection is broken: "java.net.ConnectException: Connection refused: connect: localhost" [90067-164])
->> 303 | innerRun in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 138 | run in java.util.concurrent.FutureTask
| 886 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker
| 908 | run in ''
^ 662 | run . . in java.lang.Thread
Caused by MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create Poolabl
ConnectionFactory (Connection is broken: "java.net.ConnectException: Connection refused: connect: localhost" [90067-164])
->> 303 | innerRun in java.util.concurrent.FutureTask$Sync
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 138 | run in java.util.concurrent.FutureTask
| 886 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker
| 908 | run in ''
^ 662 | run . . in java.lang.Thread
Caused by SQLNestedException: Cannot create PoolableConnectionFactory (Connection is broken: "java.net.ConnectException: Connection refused: connect: localhost"
90067-164])
->> 1549 | createPoolableConnectionFactory in org.apache.commons.dbcp.BasicDataSource
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 1388 | createDataSource in ''
| 1044 | getConnection in ''
| 303 | innerRun in java.util.concurrent.FutureTask$Sync
| 138 | run . . in java.util.concurrent.FutureTask
| 886 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker
| 908 | run . . in ''
^ 662 | run in java.lang.Thread
Caused by JdbcSQLException: Connection is broken: "java.net.ConnectException: Connection refused: connect: localhost" [90067-164]
->> 329 | getJdbcSQLException in org.h2.message.DbException
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 158 | get in ''
| 397 | connectServer in org.h2.engine.SessionRemote
| 287 | connectEmbeddedOrServer in ''
| 110 | <init> . in org.h2.jdbc.JdbcConnection
| 94 | <init> in ''
| 72 | connect in org.h2.Driver
| 38 | createConnection in org.apache.commons.dbcp.DriverConnectionFactory
| 582 | makeObject in org.apache.commons.dbcp.PoolableConnectionFactory
| 1556 | validateConnectionFactory in org.apache.commons.dbcp.BasicDataSource
| 1545 | createPoolableConnectionFactory in ''
| 1388 | createDataSource in ''
| 1044 | getConnection in ''
| 303 | innerRun in java.util.concurrent.FutureTask$Sync
| 138 | run . . in java.util.concurrent.FutureTask
| 886 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker
| 908 | run . . in ''
^ 662 | run in java.lang.Thread
Caused by ConnectException: Connection refused: connect
->> 351 | doConnect in java.net.PlainSocketImpl
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 213 | connectToAddress in ''
| 200 | connect in ''
| 366 | connect in java.net.SocksSocketImpl
| 529 | connect in java.net.Socket
| 119 | createSocket in org.h2.util.NetUtils
| 100 | createSocket in ''
| 93 | initTransfer in org.h2.engine.SessionRemote
| 393 | connectServer in ''
| 287 | connectEmbeddedOrServer in ''
| 110 | <init> . in org.h2.jdbc.JdbcConnection
| 94 | <init> in ''
| 72 | connect in org.h2.Driver
| 38 | createConnection in org.apache.commons.dbcp.DriverConnectionFactory
| 582 | makeObject in org.apache.commons.dbcp.PoolableConnectionFactory
| 1556 | validateConnectionFactory in org.apache.commons.dbcp.BasicDataSource
| 1545 | createPoolableConnectionFactory in ''
| 1388 | createDataSource in ''
| 1044 | getConnection in ''
| 303 | innerRun in java.util.concurrent.FutureTask$Sync
| 138 | run . . in java.util.concurrent.FutureTask
| 886 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker
| 908 | run . . in ''
^ 662 | run in java.lang.Thread
是什么导致了这个错误？如何解决？