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我在基於Spring的Web應用程序上連接到我的數據庫時遇到問題Tomcat 7.在尋找解決方案時，我發現很多人遇到了類似的問題，但他們的解決方案似乎都不適合我。我正在開發Eclipse（RAD 8.5）。無法打開JPA EntityManager進行事務[...]無法獲得驅動程序類「null」和URL「null」的連接
這裏是堆棧跟蹤：
2015-05-18_13:36:49.625 [http-bio-8080-exec-3] ERROR c.m.g.s.TenancyDetailsServiceImpl - Error condition: Could not open JPA EntityManager for transaction; nested exception is <openjpa-2.3.0-r422266:1540826 nonfatal general error> org.apache.openjpa.persistence.PersistenceException: There were errors initializing your configuration: <openjpa-2.3.0-r422266:1540826 fatal user error> org.apache.openjpa.util.UserException: A connection could not be obtained for driver class "null" and URL "null". You may have specified an invalid URL.
at org.apache.openjpa.jdbc.schema.DataSourceFactory.newConnectException(DataSourceFactory.java:255)
at org.apache.openjpa.jdbc.schema.DataSourceFactory.installDBDictionary(DataSourceFactory.java:241)
at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.getConnectionFactory(JDBCConfigurationImpl.java:733)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:94)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:619)
at org.apache.openjpa.lib.conf.ConfigurationImpl.instantiateAll(ConfigurationImpl.java:310)
at org.apache.openjpa.conf.OpenJPAConfigurationImpl.instantiateAll(OpenJPAConfigurationImpl.java:1670)
at org.apache.openjpa.kernel.AbstractBrokerFactory.makeReadOnly(AbstractBrokerFactory.java:651)
at org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:203)
at org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:155)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:226)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:153)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:59)
at org.springframework.orm.jpa.JpaTransactionManager.createEntityManagerForTransaction(JpaTransactionManager.java:445)
at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:366)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:371)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:94)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:619)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:319)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:196)
at com.sun.proxy.$Proxy56.getTransaction(Unknown Source)
at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:336)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:105)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at com.sun.proxy.$Proxy39.getTenancyDetailsWithTenantCode(Unknown Source)
at com.m.gsp.serviceimpl.TenancyDetailsServiceImpl.getTenancyDetailsWithTenantCode(TenancyDetailsServiceImpl.java:70)
at com.m.gsp.helper.TenancyDelegate.getTenancyDetailsWithTenantCode(TenancyDelegate.java:42)
at com.m.gsp.utils.WebUtils.fetchTenancyDetails(WebUtils.java:609)
at com.m.gsp.controllers.AuthenticationController.renderLoginPage(AuthenticationController.java:128)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:94)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:619)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:213)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at com.m.gsp.tenancy.TenantDispatcherServlet.service(TenantDispatcherServlet.java:101)
at com.m.gsp.tenancy.TenantDispatcherServletProxy.service(TenantDispatcherServletProxy.java:82)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at com.m.gsp.logging.MDCServletFilter.doFilter(MDCServletFilter.java:140)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:186)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
at com.m.gsp.tenancy.security.TenantDelegatingFilterProxy.doFilter(TenantDelegatingFilterProxy.java:65)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1176)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:795)
產生的原因：org.apache.tomcat.dbcp.dbcp.SQLNestedException：無法創建類的JDBC驅動程序 'com.microsoft.sqlserver.jdbc.SQLServerDriver' 爲連接URL'jdbc：sqlserver：AX-RISCVMSQL74 \ SQL74：1435; databaseName = GSPVN;' at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createConnectionFactory（BasicDataSource.java:1452） at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource（BasicDataSource.java:1371） at org.apache。 tomcat.dbcp.dbcp.BasicDataSource.getConnection（BasicDataSource.java:1044） at org.apache.openjpa.lib.jdbc.DelegatingDataSource.getConnection（DelegatingDataSource.java:116） at org.apache.openjpa.lib.jdbc。在數據源文件中添加數據源的數據源數據源.getConnection（DecoratingDataSource.java:93）。 at org.apache.openjpa.jdbc.schema.DataSourceFactory驅動程序 at java.sql.DriverManager.getDriver（DriverManager.java:289） 在org.apache.tomcat.dbcp.dbcp.BasicDataSource.createConnectionFactory（BasicDataSource.java:1437） ...... 89多個
的context.xml：
<Resource name="jdbc/salesvietnamMssqlGspDS"
auth="Container"
factory="org.apache.tomcat.dbcp.dbcp.BasicDataSourceFactory"
driverClassName="com.microsoft.sqlserver.jdbc.SQLServerDriver"
type="javax.sql.DataSource"
maxActive="50"
maxIdle="10"
maxWait="15000"
username="x"
password="y"
url="jdbc:sqlserver:server/instance:port;databaseName=dbname;"
removeAbandoned="true"
removeAbandonedTimeout="30"
logAbandoned="true" />
應用程序的WEB-INF /網頁。 XML：
<resource-ref>
<description>JDBCconnection</description>
<res-ref-name>jdbc/salesvietnamMssqlGspDS</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
我甚至把相同的resource-ref在服務器的web.xml中也是如此。
sqljdbc4.jar存在於服務器的/lib目錄中。 我將它添加到運行配置菜單中用戶條目下的Classpath中。 我甚至嘗試在構建路徑和部署程序集中添加它，我已經驗證它確實顯示在WEB-INF/lib中。
以上都沒有影響。
我讀了關於需要使用Class.forName("something.jdbc.driver.YourFubarDriver");來註冊驅動程序，但後來我也讀到了JDBC4不再需要的東西。
任何想法？