使用BoneCP作为连接池,在启动Tomcat报出以下异常: 一月 02, 2016 2:12:17 下午 org.apache.tomcat.util.digester.SetPropertiesRule begin警告: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:mynewdpi' did not find a…

shiro cache manage配置报错: org.springframework.beans.MethodInvocationException: Property 'cacheManager' threw exception; nested exception is org.apache.shiro.cache.CacheException: net.sf.ehcache.CacheException: Caches cannot be added by name when defaul…

Exception in thread "main" org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userServiceImpl': Unsatisfied dependency expressed through field 'dao'; nested exception is org.springframework.beans.fac…

运行时出现错误:Exception in thread "main" java.lang.NullPointerException 该问题多半是由于用到的某个对象只进行了声明,而没有初始化,即没有被new. 找到32行:heightTextField.addFocusListener(this); 前面有:JTextField heightTextField;只创建了heigthTextField对象,编写程序时没有报错,但是没有new,不能add. 错误原因:heigthTextFi…

严重: Exception starting filter struts2 java.lang.NullPointerException at com.opensymphony.xwork2.util.FileManager$FileRevision.needsReloading(FileManager.java:209) 这是struts-2.1.6版本的一个BUG,原因是tomcat安装目录包含了空格 .避免这个错误的方法可以设置devmode为false: <constant name=&qu…

Exception in thread "HouseKeeper" java.lang.NullPointerException at org.logicalcobwebs.proxool.HouseKeeperController.getHouseKeeperToRun(HouseKeeperController.java:52) at org.logicalcobwebs.proxool.HouseKeeperThread.run(HouseKeeperThread.java:33…

源代码如下: Point[] points=new Point[n];//Point是一个类 for(int i=0;i<n;i++) { System.out.print("请输入x:"); points[i].setX(in.nextInt());//报错的第29行 System.out.print("请输入y:"); points[i].setY(in.nextInt()); } 报错信息如下: Exception in thread "mai…

zepplin0.7.2报错ERROR, exception: null, result: %text java.lang.NullPointerException的处理 问题描述: 使用zepplin查询业务系统数据时报错空指针,具体如下: interpreter.remote.RemoteInterpretershared_session736569169 INFO [2018-01-05 14:54:50,040] ({pool-2-thread-5} Paragraph.java[job…

1.在window操作系统上,使用eclipse开发工具从hdfs分布式文件系统上下载文件报空指针异常解决方法: log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.a…

首先查看是否是端口冲突引起,在日志信息该错误位置往上找,如果再无错误信息,而只有该错误,则原因可能如下: 原因: This is because Proxool is not being shutdown properly. If the JVM stops then Proxool recognises that and shuts down gracefully, but if you redeploy Proxool into some environments (for example,…