代码如下: final Connection conn=pool.remove(0); //利用动态代理改造close方法 Connection proxy= (Connection) Proxy.newProxyInstance(conn.getClass().getClassLoader(), conn.getClass().getInterfaces(), new InvocationHandler() { @Override public Object invoke(Object pro…

原因:Connection.getInterfaces() 与数据库驱动有关,数据库驱动不同 Connection.getInterfaces() 的结果也就不同,Connection.getInterfaces() 返回的是 Class[] 数组,此数组的第一个元素必须是Connection才能把创建的代理类转为Connection对象,否则就会报:Java.lang.ClassCastException. 因为Connection本身就是一个接口,它的字节码符合第二个参数要求,把conn.g…

当导入的包为:import java.sql.Statement;时,无任何错误 当导入的包为:import java.beans.Statement;时,出错…

一.错误信息 java.lang.ClassCastException: org.slf4j.impl.Log4jLoggerFactory cannot be cast to ch.qos.logback.classic.LoggerContextat ch.qos.logback.ext.spring.LogbackConfigurer.initLogging(LogbackConfigurer.java:72)at ch.qos.logback.ext.spring.web.WebLogb…

严重: Failed to initialize end point associated with ProtocolHandler ["http-bio-8080"] java.net.BindException: Address already in use <null>:8080 at org.apache.tomcat.util.net.JIoEndpoint.bind(JIoEndpoint.java:407) at org.apache.tomcat.util.…

A child container failed during startjava.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[/book_shop]] at java.util.concurrent.Futur…

1 严重: Servlet /N002-1.0 threw load() exception 2 java.lang.ClassCastException: com.sun.proxy.$Proxy27 cannot be cast to com.bbk.n002.service.QuestionService 3 at com.bbk.n002.servlet.CreateTaskQueueServlet.init(CreateTaskQueueServlet.java:28) 4 at ja…

java.lang.ClassCastException: com.sun.proxy.$Proxy53 cannot be cast to cn.service.impl.WorkinggServiceImpl at cn.service.impl.WorkinggServiceImpl.getWorkinggService(WorkinggServiceImpl.java:64) at cn.servlet.WorkingServlet.doGet(WorkingServlet.java:3…

java.lang.ClassCastException: com.sun.proxy.$Proxy* cannot be cast to***问题解决方案 临床表现: 病例: 定义代理类: @Transactional @Repository public UserDaoImpl implements UserDao extends BaseDaoImpl{ /*没有实现任何接口*/ } 获取代理类: ApplicationContext ctx = new ClassPathXmlAppli…

java.lang.ClassCastException: android.view.AbsSavedState$1 cannot be cast to android.widget.ProgressBar$SavedState 这个问题折腾了老半天,后来才发现是因为不同布局文件中有重名的控件,而且在要显示的Activity中同时用到了这些布局,所以导致这个问题.…