Java TemplateProcessingException之Cannot execute subtraction: operands are null and #1234

异常产生场景复述：发送邮件之模板与数据值之间的绑定；

ob.core.logging.LoggingAspect      : URI=/api/process/mail/comrise/send/email,X-AUTH=null,X-USER=null, Exception in api.zhanjob.modules.controller.EmailController.sendMail() with cause = 'NULL' and exception = 'Cannot execute subtraction: operands are "null" and "#1234" (e-comrise-postinfo:42)'org.thymeleaf.exceptions.TemplateProcessingException: Cannot execute subtraction: operands are "null" and "#1234" (e-comrise-postinfo:42)at org.thymeleaf.standard.expression.SubtractionExpression.executeSubtraction(SubtractionExpression.java:92)at org.thymeleaf.standard.expression.ComplexExpression.executeComplex(ComplexExpression.java:58)at org.thymeleaf.standard.expression.Expression.execute(Expression.java:107)at org.thymeleaf.standard.expression.Expression.execute(Expression.java:133)at org.thymeleaf.standard.expression.Expression.execute(Expression.java:120)at org.thymeleaf.standard.processor.attr.AbstractStandardTextChildModifierAttrProcessor.getText(AbstractStandardTextChildModifierAttrProcessor.java:68)at org.thymeleaf.processor.attr.AbstractTextChildModifierAttrProcessor.getModifiedChildren(AbstractTextChildModifierAttrProcessor.java:59)at org.thymeleaf.processor.attr.AbstractChildrenModifierAttrProcessor.processAttribute(AbstractChildrenModifierAttrProcessor.java:59)at org.thymeleaf.processor.attr.AbstractAttrProcessor.doProcess(AbstractAttrProcessor.java:87)at org.thymeleaf.processor.AbstractProcessor.process(AbstractProcessor.java:212)at org.thymeleaf.dom.Node.applyNextProcessor(Node.java:1017)at org.thymeleaf.dom.Node.processNode(Node.java:972)at org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:695)at org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:668)at org.thymeleaf.dom.Node.processNode(Node.java:990)at org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:695)at org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:668)at org.thymeleaf.dom.Node.processNode(Node.java:990)at org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:695)at org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:668)at org.thymeleaf.dom.Node.processNode(Node.java:990)at org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:695)at org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:668)at org.thymeleaf.dom.Node.processNode(Node.java:990)at org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:695)at org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:668)at org.thymeleaf.dom.Node.processNode(Node.java:990)at org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:695)at org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:668)at org.thymeleaf.dom.Node.processNode(Node.java:990)at org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:695)at org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:668)at org.thymeleaf.dom.Node.processNode(Node.java:990)at org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:695)at org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:668)at org.thymeleaf.dom.Node.processNode(Node.java:990)at org.thymeleaf.dom.NestableNode.computeNextChild(NestableNode.java:695)at org.thymeleaf.dom.NestableNode.doAdditionalProcess(NestableNode.java:668)at org.thymeleaf.dom.Node.processNode(Node.java:990)at org.thymeleaf.dom.Document.process(Document.java:93)at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1155)at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1060)at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1011)at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:924)at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:898)at api.zhanjob.modules.service.impl.MailServiceImpl.sendEmail(MailServiceImpl.java:508)at api.zhanjob.modules.service.impl.MailServiceImpl.sendEmail(MailServiceImpl.java:482)at api.zhanjob.modules.service.impl.MailServiceImpl.doSendComriseMail(MailServiceImpl.java:257)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333)at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)at com.sun.proxy.$Proxy249.doSendComriseMail(Unknown Source)at api.zhanjob.modules.controller.EmailController.sendMail(EmailController.java:32)at api.zhanjob.modules.controller.EmailController$$FastClassBySpringCGLIB$$719e1c6d.invoke(<generated>)at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:738)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:85)at com.zhanjob.zjob.core.logging.LoggingAspect.logAround(LoggingAspect.java:105)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:629)at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:618)at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:70)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)at org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJAfterThrowingAdvice.java:62)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:673)at api.zhanjob.modules.controller.EmailController$$EnhancerBySpringCGLIB$$d8022af9.sendMail(<generated>)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)at org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:110)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:208)at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:108)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:106)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:64)at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)at io.undertow.server.Connectors.executeRootHandler(Connectors.java:332)at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:812)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)at java.lang.Thread.run(Thread.java:748)

1⃣️邮件模版html中代码片段示例：

2⃣️数据值的参数：

3⃣️具体原因：由于在html中绑定参数名为jobTitile，而代码中数据参数名为jobtitle，html找不到对应的值，绑定为null，

4⃣️根据提示：Cannot execute subtraction: operands are "null" and "#1234"-> 翻译无法执行减法：操作数是“null”

5⃣️更改html如下：

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