ERROR DefaultDispatcherErrorHandler:42 - Exception occurred during processing request: Source must

最新推荐文章于 2021-01-05 18:20:08 发布
最新推荐文章于 2021-01-05 18:20:08 发布
阅读量1.5k 收藏
点赞数
CC 4.0 BY-SA版权
分类专栏： BUG
版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
本文链接：https://blog.youkuaiyun.com/lxiansheng001/article/details/80560229
本文探讨了一个关于Struts2框架中文件上传时出现的NullPointerException异常问题，详细分析了错误原因在于文件路径设置不当与属性命名冲突，并提供了具体的代码修正建议。

摘要生成于 C知道 ，由 DeepSeek-R1 满血版支持， 前往体验 >

 16:56:50,511 ERROR DefaultDispatcherErrorHandler:42 - Exception occurred during processing request: Source must not be null
java.lang.NullPointerException: Source must not be null
    at org.apache.commons.io.FileUtils.copyFile(FileUtils.java:998)
    at org.apache.commons.io.FileUtils.copyFile(FileUtils.java:968)
    at com.chuantao.web.action.CustomerAction.add(CustomerAction.java:167)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:870)
    at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1293)
    at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)
    at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)
    at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)
    at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1369)
    at ognl.ASTMethod.getValueBody(ASTMethod.java:90)
    at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
    at ognl.SimpleNode.getValue(SimpleNode.java:258)
    at ognl.Ognl.getValue(Ognl.java:494)
    at ognl.Ognl.getValue(Ognl.java:458)
    at com.opensymphony.xwork2.ognl.OgnlUtil$2.execute(OgnlUtil.java:309)
    at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecute(OgnlUtil.java:340)
    at com.opensymphony.xwork2.ognl.OgnlUtil.getValue(OgnlUtil.java:307)
    at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:423)
    at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:287)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:250)
    at org.apache.struts2.interceptor.DeprecationInterceptor.intercept(DeprecationInterceptor.java:41)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:167)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
    at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:76)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:125)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:326)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:139)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
    at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:564)
    at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:81)
    at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.springframework.orm.hibernate5.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:151)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    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:219)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1115)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Unknown Source)

这个错误是因为再上传的的时候，本意是有一个setfilePath（）我也写成了封装器的属性upload的了。导致写setupload重名了


拦截器封装的属性名称就是upload，而我把图片路径也写成这个upload名称的了 在代码中使用setUpload()时发生错误

/**
	 * 文件的上传，需要在CustomerAction类中定义成员的属性，命名是有规则的！！
	 * private File upload;		// 表示要上传的文件。。。这是拦截器的名称
	 * private String uploadFileName;	表示是上传文件的名称（没有中文乱码）
	 * private String uploadContentType;	表示上传文件的MIME类型
	 * 提供set方法，拦截器就注入值了
	 */
	
	// 要上传的文件
	private File upload;
	// 文件的名称
	private String uploadFileName;
	// 文件的MIME的类型
	private String uploadContentType;
	
	public void setUpload(File upload) {
		this.upload = upload;
	}
	public void setUploadFileName(String uploadFileName) {
		this.uploadFileName = uploadFileName;
	}
	public void setUploadContentType(String uploadContentType) {
		this.uploadContentType = uploadContentType;
	}
	/**
	 * 保存客户的方法
	 * @return
	 * @throws IOException 
	 */
	public String add() throws IOException{
		if(uploadFileName != null){
			// 打印
			System.out.println("文件类型："+uploadContentType);
			// 把文件的名称处理一下
			String uuidname = UploadUtils.getUUIDName(uploadFileName);
			// 把文件上传到D:\\apache-tomcat-7.0.52\\webapps\\upload
			System.out.println(uuidname);
//			上传的地址       
			String path = "D:\\JavaTomcat\\apache-tomcat-7.0.85\\upload\\";
			// 创建file对象
			File file = new File(path+uuidname);
			// 简单方式
			FileUtils.copyFile(upload, file);
			
			// 把上传的文件的路径，保存到客户表中
			customer.setFilePath(path+uuidname);//这里原来我是写成了 upload 发生了冲突
		}
		customerService.save(customer);
		return "list";
	}


bos项目day04区域条件查询:报错ERROR DefaultDispatcherErrorHandler:42 - Exception occurred during processing req
xman2008wang的博客
11-21 1万+
报错如下:21:23:46,006 INFO StatisticalLoggingSessionEventListener:258 - Session Metrics { 0 nanoseconds spent acquiring 0 JDBC connections; 0 nanoseconds spent releasing 0 JDBC connections; 0
ldap接触（3）之LDAP特定错误以及错误一览表
weixin_33850890的博客
02-23 3175
2019独角兽企业重金招聘Python工程师标准>>> ...
ERROR DefaultDispatcherErrorHandler:42 - Exception occurred during processing request: null
zxjnmc
01-27 3055
我用的ssh框架,在修改或者保存对象的时候报此错误,他的提示很明显是request null,也就是说请求为null,请看以下代码: @Action(value = "stuAction_save",results = { @Result(name = "success",type = "redirect",location = "../../pages/base/s...
DefaultDispatcherErrorHandler: Exception occurred during processing request
wuchao_codingforever的博客
04-19 9815
我要开始添加数据了 java.lang.NullPointerException Model中administratorUnitVO的值：com.manage.model.AdministratorUnitVO@3a9312ea  at com.manage.action.AdministrativeUnitManageAction.doAdministrativeUnitAdd(Admin
10:38:45,707 ERROR DefaultDispatcherErrorHandler:42 - Exception occurred during processing request:
helloworldmycsdn的博客
06-19 5144
 10:38:45,707 ERROR DefaultDispatcherErrorHandler:42 - Exception occurred during processing request: Write operations are not allowed in read-only mode (FlushMode.MANUAL): Turn your Session into Fl
论技术领域学好英文的重要性
工控IT“陈生开”的博客
11-17 614
OPCUASDKHelp 封页 Welcome to the UA SDK(欢迎使用UA SDK) //欢迎使用统一体系结构软件开发工具包 Welcome to the Unified Architecture Software Development Kit // uasdk是一组接口、库和可执行文件，允许开发人员使用.NET编程环境快速创建UA应用程序。SDK包括： The UA SDK is a...
A002-185-2531
GONGZIXUY的博客
01-05 1616
目录 第一页作业 2 1.1验收承认(acceptance) 2 1.2要求需要(requirement) 5 1.3最初形态(Prototype) 6 1.4Model(模型) 7 1.5异义词(Homonym) 8 1.6检查(Inspection) 8 1.7敏捷式项目管理(Agile project management) 9 1.8特征(Feature) 10 1.9实体(Entity) 12 1.10错误(Error) 14 第二页作业 15 2.1实现视图(implementation vie
Incorrect column count: expected 1, actual 4 处理；IncorrectResultSetColumnCountException，商城系统CURD
热门推荐
Syntacticsugar's blog
09-17 1万+
IncorrectResultSetColumnCountException； 该报错是映射结果集（ResultSet），所映射column(列)count(数目)错误，例如； 假设，你使用的映射方法所映射的是单列，但是你sql语句查询出结果是多列，解析执行映射结果集，那这不就报错飚红了么；   下面给出一个例子； 抓住Dao层就是一顿狂改，然后service业务层。。。 erro...
12C ORA-错误汇总20
ugghhj的博客
11-11 1358
12C ORA-错误汇总20
MAVEN SSHERROR DefaultDispatcherErrorHandler:42 - Exception occurred during processing request: null
飘
07-25 1611
在做Bos物流系统时,由于使用了WS架构,需要注入代理,由于忘记写注解,一直报这个错,检查前台数据时传过来的 加了注解后就好了  //注入代理对象     @Autowired     private CustomerServiceImpl customerProxy;  08:19:09,559 ERROR DefaultDispatcherErrorHandler:42 - Exce...
ERROR DefaultDispatcherErrorHandler:42 - Exception occurred during processing request
csdn9228的博客
07-05 2822
七月 05, 2019 9:18:48 下午 org.apache.catalina.startup.VersionLoggerListener log 信息: Server version: Apache Tomcat/9.0.13 七月 05, 2019 9:18:48 下午 org.apache.catalina.startup.VersionLoggerListener lo...
org.apache.struts2.dispatcher.DefaultDispatcherErrorHandler - Exception occurred during processing
bubbleTg的博客
12-03 5056
2018年12月3日 16:42 ERROR org.apache.struts2.dispatcher.DefaultDispatcherErrorHandler - Exception occurred during processing request: com.sun.proxy.$Proxy46.login() java.lang.NoSuchMethodException: co...
异常处理：DefaultDispatcherErrorHandler:42 COMMIT/AUTO or remove 'readOnly' marker from transaction defin
冰糖棉花的博客
04-23 613
DefaultDispatcherErrorHandler:42 - Exception occurred during processing request: Write operations are not allowed in read-only mode (FlushMode.MANUAL): Turn your Session into FlushMode.COMMIT/AUTO or ...
ssh--service注入时出错：ERRORDefaultDispatcherErrorHandler:42
heting717的博客
05-14 1万+
ERRORDefaultDispatcherErrorHandler:42 - Exception occurred during processingrequest: Unable to instantiate Action, userAction,  defined for 'user_regist' in namespace'/'Error creating bean with name '
ERROR DefaultDispatcherErrorHandler:87 - Exception occurred during processing request: Can not deserialize instance of java.util.Date out of START_OBJECT token
06-09
这个错误通常发生在尝试将JSON格式的数据转换为Java对象时，其中包含一个日期类型的属性。在JSON中，日期类型通常表示为字符串，如"2021-10-20"，而Java中的日期类型是java.util.Date。 这个错误的原因是Jackson库无法将JSON中的日期字符串转换为Java中的日期类型。为了解决这个问题，我们需要告诉Jackson如何将日期字符串转换为Java日期类型。 一种解决方法是在Java类中使用注解@JsonFormat来指定日期格式，示例代码如下： ```java public class Person { private String name; @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd") private Date birthDate; // getters and setters } ``` 在上面的代码中，我们使用@JsonFormat注解指定了birthDate属性的日期格式为"yyyy-MM-dd"。这样，当Jackson库尝试将JSON转换为Person对象时，它就知道如何解析日期字符串并将其转换为Date类型。 另一种解决方法是在ObjectMapper对象中配置日期格式，示例代码如下： ```java ObjectMapper mapper = new ObjectMapper(); mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd")); Person person = mapper.readValue(jsonString, Person.class); ``` 在上面的代码中，我们通过setDateFormat方法设置了ObjectMapper对象的日期格式为"yyyy-MM-dd"。这样，在将JSON转换为Person对象时，Jackson库就知道如何解析日期字符串并将其转换为Date类型。
评论
添加红包

请填写红包祝福语或标题

个

红包个数最小为10个

元

红包金额最低5元

当前余额3.43元 前往充值 >
需支付：10.00元
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付元
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明：

1.余额是钱包充值的虚拟货币，按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载，可以购买VIP、付费专栏及课程。

余额充值