您好我正在使用Spring，Hibernate 3和JPA，我已将JUnit测试配置为连接到HSQLDB（内存中）而不是我用于我的应用程序的MySQL数据库。这个工作正常，直到最近，我无法连接到HSQLDB Heres堆栈跟踪和我的.xml和.properties配置文件
11:06:41,979 INFO Dialect:206 - Using dialect: org.hibernate.dialect.HSQLDialect
11:06:41,986 INFO JdbcSupportLoader:70 - Disabling contextual LOB creation as connection was null
11:06:41,987 INFO TransactionFactoryFactory:62 - Transaction strategy: org.springframework.orm.hibernate3.SpringTransactionFactory
11:06:41,988 INFO TransactionManagerLookupFactory:80 - No TransactionManagerLookup configured (in JTA environment, use of read-write or transactional second-level cache is not recommended)
11:06:41,988 INFO SettingsFactory:169 - Automatic flush during beforeCompletion(): disabled
11:06:41,988 INFO SettingsFactory:173 - Automatic session close at end of transaction: disabled
11:06:41,989 INFO SettingsFactory:188 - Scrollable result sets: disabled
11:06:41,990 INFO SettingsFactory:196 - JDBC3 getGeneratedKeys(): disabled
11:06:41,990 INFO SettingsFactory:204 - Connection release mode: auto
11:06:41,991 INFO SettingsFactory:231 - Default batch fetch size: 1
11:06:41,991 INFO SettingsFactory:235 - Generate SQL with comments: disabled
11:06:41,991 INFO SettingsFactory:239 - Order SQL updates by primary key: disabled
11:06:41,991 INFO SettingsFactory:243 - Order SQL inserts for batching: disabled
11:06:41,992 INFO SettingsFactory:410 - Query translator: org.hibernate.hql.ast.ASTQueryTranslatorFactory
11:06:41,994 INFO ASTQueryTranslatorFactory:47 - Using ASTQueryTranslatorFactory
11:06:41,994 INFO SettingsFactory:251 - Query language substitutions: {}
11:06:41,994 INFO SettingsFactory:256 - JPA-QL strict compliance: disabled
11:06:41,994 INFO SettingsFactory:261 - Second-level cache: enabled
11:06:41,994 INFO SettingsFactory:265 - Query cache: disabled
11:06:41,995 INFO SettingsFactory:395 - Cache region factory : org.hibernate.cache.impl.NoCachingRegionFactory
11:06:41,995 INFO SettingsFactory:275 - Optimize cache for minimal puts: disabled
11:06:41,995 INFO SettingsFactory:284 - Structured second-level cache entries: disabled
11:06:42,000 INFO SettingsFactory:304 - Echoing all SQL to stdout
11:06:42,001 INFO SettingsFactory:313 - Statistics: disabled
11:06:42,001 INFO SettingsFactory:317 - Deleted entity synthetic identifier rollback: disabled
11:06:42,001 INFO SettingsFactory:332 - Default entity-mode: pojo
11:06:42,002 INFO SettingsFactory:336 - Named query checking : enabled
11:06:42,002 INFO SettingsFactory:340 - Check Nullability in Core (should be disabled when Bean Validation is on): enabled
11:06:42,063 INFO SessionFactoryImpl:199 - building session factory
11:06:42,315 INFO SessionFactoryObjectFactory:105 - Not binding factory to JNDI, no JNDI name configured
11:06:42,323 INFO SchemaExport:226 - Running hbm2ddl schema export
11:06:42,325 INFO SchemaExport:251 - exporting generated schema to database
11:07:11,327 WARN BasicResourcePool:1224 - com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@1d4eeb5 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30).
11:07:11,327 WARN JDBCExceptionReporter:100 - SQL Error: 0, SQLState: null
11:07:11,328 ERROR JDBCExceptionReporter:101 - Connections could not be acquired from the underlying database!
11:07:11,329 ERROR SchemaExport:274 - schema export unsuccessful
java.sql.SQLException: Connections could not be acquired from the underlying database!
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:104)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:264)
at com.mchange.v2.c3p0.PoolBackedDataSource.getConnection(PoolBackedDataSource.java:94)
at com.mchange.v2.c3p0.ComboPooledDataSource.getConnection(ComboPooledDataSource.java:521)
at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:81)
at org.hibernate.tool.hbm2ddl.SuppliedConnectionProviderConnectionHelper.prepare(SuppliedConnectionProviderConnectionHelper.java:51)
at org.hibernate.tool.hbm2ddl.SchemaExport.execute(SchemaExport.java:252)
at org.hibernate.tool.hbm2ddl.SchemaExport.create(SchemaExport.java:211)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:383)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1385)
at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:954)
at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:860)
at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:779)
at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:211)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1514)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1452)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:848)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:790)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:707)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:551)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:284)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1106)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:585)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:464)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:103)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:1)
at org.springframework.test.context.support.DelegatingSmartContextLoader.loadContext(DelegatingSmartContextLoader.java:228)
at org.springframework.test.context.TestContext.loadApplicationContext(TestContext.java:124)
at org.springframework.test.context.TestContext.getApplicationContext(TestContext.java:148)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:109)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:75)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:321)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:211)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:288)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:290)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.
at com.mchange.v2.resourcepool.BasicResourcePool.awaitAcquire(BasicResourcePool.java:972)
at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:208)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:260)
答案 0 :(得分：0)
我在内存数据库中使用HSQLDB时遇到了同样的问题。特别是我也使用com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool。事实证明，JAR hsqldb.jar不在类路径上。添加后一切正常。