1、在使用Spring+Mybatis整合时遇到了一个问题,在bean.xml配置文件引用外部jdbc.properties的时候报错,如下所示:
1 java.lang.ClassNotFoundException: ${jdbc.driver}
2 at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1358)
3 at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1180)
4 at java.lang.Class.forName0(Native Method)
5 at java.lang.Class.forName(Class.java:264)
6 at com.mchange.v2.c3p0.DriverManagerDataSource.ensureDriverLoaded(DriverManagerDataSource.java:100)
7 at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:132)
8 at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182)
9 at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)
10 at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137)
11 at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014)
12 at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)
13 at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810)
14 at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
15 [laboratory] 2021-02-24 09:40:42.339 < WARN> [com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0] BasicResourcePool.run(1841) | com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@398ac721 -- 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). Last acquisition attempt exception:
16 java.sql.SQLException: No suitable driver
17 at java.sql.DriverManager.getDriver(DriverManager.java:315)
18 at com.mchange.v2.c3p0.DriverManagerDataSource.driver(DriverManagerDataSource.java:223)
19 at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:134)
20 at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182)
21 at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)
22 at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137)
23 at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014)
24 at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)
25 at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810)
26 at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
27 org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
28 ### Error querying database. Cause: java.lang.RuntimeException: java.sql.SQLException: Connections could not be acquired from the underlying database!
29 ### Cause: java.lang.RuntimeException: java.sql.SQLException: Connections could not be acquired from the underlying database!
30 at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:77)
31 at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:446)
32 at com.sun.proxy.$Proxy11.selectOne(Unknown Source)
33 at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:166)
34 at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:82)
35 at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)
36 at com.sun.proxy.$Proxy16.userInfoLogin(Unknown Source)
37 at com.flea.service.impl.UserInfoServiceImpl.userInfoLogin(UserInfoServiceImpl.java:23)
38 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
39 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
40 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
41 at java.lang.reflect.Method.invoke(Method.java:498)
42 at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
43 at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
44 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
45 at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)
46 at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262)
47 at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
48 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
49 at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
50 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
51 at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
52 at com.sun.proxy.$Proxy25.userInfoLogin(Unknown Source)
53 at com.flea.action.UserController.login(UserController.java:39)
54 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
55 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
56 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
57 at java.lang.reflect.Method.invoke(Method.java:498)
58 at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
59 at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
60 at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
61 at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
62 at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:690)
63 at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
64 at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
65 at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
66 at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
67 at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
68 at javax.servlet.http.HttpServlet.service(HttpServlet.java:652)
69 at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
70 at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
71 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
72 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
73 at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
74 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
75 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
76 at com.flea.utils.UtfFilter.doFilter(UtfFilter.java:28)
77 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
78 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
79 at com.flea.utils.LoginFilter.doFilter(LoginFilter.java:43)
80 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
81 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
82 at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
83 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
84 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
85 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
86 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
87 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
88 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:544)
89 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
90 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
91 at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)
92 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
93 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
94 at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:616)
95 at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
96 at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:831)
97 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1634)
98 at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
99 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
100 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
101 at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
102 at java.lang.Thread.run(Thread.java:748)
103 Caused by: org.apache.ibatis.exceptions.PersistenceException:
104 ### Error querying database. Cause: java.lang.RuntimeException: java.sql.SQLException: Connections could not be acquired from the underlying database!
105 ### Cause: java.lang.RuntimeException: java.sql.SQLException: Connections could not be acquired from the underlying database!
106 at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
107 at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:150)
108 at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)
109 at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77)
110 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
111 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
112 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
113 at java.lang.reflect.Method.invoke(Method.java:498)
114 at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)
115 ... 71 more
116 Caused by: java.lang.RuntimeException: java.sql.SQLException: Connections could not be acquired from the underlying database!
117 at com.github.pagehelper.PageHelper.getUrl(PageHelper.java:287)
118 at com.github.pagehelper.PageHelper.getSqlUtil(PageHelper.java:310)
119 at com.github.pagehelper.PageHelper.initSqlUtil(PageHelper.java:266)
120 at com.github.pagehelper.PageHelper.intercept(PageHelper.java:253)
121 at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)
122 at com.sun.proxy.$Proxy34.query(Unknown Source)
123 at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)
124 ... 78 more
125 Caused by: java.sql.SQLException: Connections could not be acquired from the underlying database!
126 at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)
127 at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:529)
128 at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)
129 at com.github.pagehelper.PageHelper.getUrl(PageHelper.java:284)
130 ... 84 more
131 Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.
132 at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1319)
133 at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:557)
134 at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:477)
135 at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:525)
136 ... 86 more
我的bean.xml配置文件,如果直接引用数据库的驱动,账号密码,url就不会出错的,如下所示:
1 <!-- 引入外部配置文件,加载jdbc.properties里面的值 -->
2 <context:property-placeholder location="classpath:jdbc.properties" />
3
4 <!-- 配置数据源dataSource,记得去掉mybatils.cfg.xml的数据源相关配置 -->
5 <bean id="dataSource"
6 class="com.mchange.v2.c3p0.ComboPooledDataSource">
7 <property name="jdbcUrl" value="${jdbc.url}" />
8 <property name="driverClass" value="${jdbc.driver}" />
9 <property name="user" value="${jdbc.username}" />
10 <property name="password" value="${jdbc.password}" />
11 <!-- <property name="jdbcUrl" value="jdbc:mysql://127.0.0.1:3306/laboratory_sys?useUnicode=true&characterEncoding=UTF-8" />
12 <property name="driverClass" value="com.mysql.jdbc.Driver" />
13 <property name="user" value="root" />
14 <property name="password" value="123456" />
15 -->
16 </bean>
这个问题是无法识别占位符,就是在加载过程中直接把${jdbc.driver}当做字符串处理了,具体报错问题就是,MapperScannerConfigurer 先于properties文件处理,意思是没进行占位符的变量赋值就被使用了,去掉sqlSessionFactory这个属性,我最开始的配置,如下所示:
1 <!-- 配置 转换器,对于在basePackage设置的包(包括子包)下的接口类,
2 如果接口类的全类名在Mapper.xml文件中和定义过命名空间一致,
3 将被转换成spring的bean,在调用 的地方通过@Autowired方式将可以注入接口实例
4 -->
5 <!-- 注意: 1、配置mybatis的代理接口开发。
6 2、接口类名和映射文件必须同名。
7 3、接口类和映射文件必须在同一个目录下。
8 4、接口的映射文件的namespace名称必须是接口的全限定名。
9 5、接口的方法名必须和映射的statement的id一致。 -->
10 <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
11 <property name="sqlSessionFactory" ref="sqlSessionFactory" />
12 <!-- 扫描所有dao接口的实现,加入到ioc容器中 -->
13 <property name="basePackage" value="com.flea.dao" />
14 </bean>
去掉sqlSessionFactory这个属性,之后,变成下面的样子了,如下所示:
1 <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
2 <!-- <property name="sqlSessionFactory" ref="sqlSessionFactory" /> -->
3 <!-- 扫描所有dao接口的实现,加入到ioc容器中 -->
4 <property name="basePackage" value="com.flea.dao" />
5 </bean>
我的session工厂配置,同时记得加上这样的bean,id的值是sqlSessionFactory,因为要使用的时候会去找这个bean去连接数据库。
1 <!-- 配置session工厂 -->
2 <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
3 <property name="dataSource" ref="dataSource" />
4 <property name="configLocation" value="classpath:mybatils.cfg.xml" />
5 <!--配置扫描式加载SQL映射文件,记得去掉mybatis-config配置 -->
6 <property name="mapperLocations" value="classpath:com/flea/dao/*.xml" />
7 </bean>
重启项目,测试,发现已经正常了。
2、此时,如果操作数据库发现乱码,可以修改url的字符集,我的jdbc.properties配置,如下所示:
1 jdbc.driver=com.mysql.jdbc.Driver
2 jdbc.url=jdbc:mysql://127.0.0.1:3306/laboratory_sys?characterEncoding=utf8&useSSL=false&serverTimezone=UTC&rewriteBatchedStatements=true
3 jdbc.username=root
4 jdbc.password=123456