解决-前端：如何在ftl文件中判断null

最新推荐文章于 2024-03-14 18:06:58 发布
原创 最新推荐文章于 2024-03-14 18:06:58 发布 · 4.2k 阅读 · 1 ·
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文章标签：

#ftl #null #属性

判断属性不为null

<#if object.attribute??></#if>

判断对象或者属性不为null

<#if (object.attribute)??></#if>
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2025-10-24 10:45:31.346 INFO 25365 --- [[ACTIVE] ExecuteThread: '65' for queue: 'weblogic.kernel.Default (self-tuning)'] com.smec.apps.coa.sap.SAPInterface : call method ZIF_SBS_GET_DROPDOWN,call success 2025-10-24 10:45:31.356 INFO 25365 --- [[ACTIVE] ExecuteThread: '65' for queue: 'weblogic.kernel.Default (self-tuning)'] c.s.a.c.s.impl.CoaVendorServiceImpl : sapGetDropDown listMaterialGroupFromSap Message:Get Material Group successful. 2025-10-24 10:45:35.255 INFO 25365 --- [[ACTIVE] ExecuteThread: '67' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.group.apps.core.aop.ConsolePrintAop : 请求耗时 : 8636 2025-10-24 10:45:35.353 INFO 25365 --- [[ACTIVE] ExecuteThread: '72' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.group.apps.core.aop.ConsolePrintAop : 请求耗时 : 8734 2025-10-24 10:45:42.005 INFO 25365 --- [[ACTIVE] ExecuteThread: '72' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.g.a.weaver.sso.filter.LoginFilter : ^_^ logout url: http://sbssso.smecs.com:8082/cas/logout?service=http://sbsfn.smecs.com/coa 2025-10-24 10:45:42.635 ERROR 25365 --- [[ACTIVE] ExecuteThread: '44' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.group.apps.core.aop.ConsolePrintAop : 抛出异常 : null 2025-10-24 10:45:42.655 ERROR 25365 --- [[ACTIVE] ExecuteThread: '112' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.group.apps.core.aop.ConsolePrintAop : 抛出异常 : null 2025-10-24 10:45:43.478 ERROR 25365 --- [[ACTIVE] ExecuteThread: '66' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.group.apps.core.aop.ConsolePrintAop : 抛出异常 : null 2025-10-24 10:45:43.701 ERROR 25365 --- [[ACTIVE] ExecuteThread: '96' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.group.apps.core.aop.ConsolePrintAop : 抛出异常 : null 2025-10-24 10:45:45.774 ERROR 25365 --- [[ACTIVE] ExecuteThread: '66' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.g.a.c.c.e.Error500Controller : 捕获到错误: NullPointerException: null 2025-10-24 10:45:45.775 ERROR 25365 --- [[ACTIVE] ExecuteThread: '96' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.g.a.c.c.e.Error500Controller : 捕获到错误: NullPointerException: null 2025-10-24 10:45:45.785 ERROR 25365 --- [[ACTIVE] ExecuteThread: '44' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.g.a.c.c.e.Error500Controller : 捕获到错误: NullPointerException: null 2025-10-24 10:45:45.788 ERROR 25365 --- [[ACTIVE] ExecuteThread: '112' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.g.a.c.c.e.Error500Controller : 捕获到错误: NullPointerException: null 2025-10-24 10:45:46.123 ERROR 25365 --- [[ACTIVE] ExecuteThread: '38' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.group.apps.core.aop.ConsolePrintAop : 抛出异常 : null 2025-10-24 10:45:46.173 ERROR 25365 --- [[ACTIVE] ExecuteThread: '8' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.group.apps.core.aop.ConsolePrintAop : 抛出异常 : null 2025-10-24 10:45:46.610 ERROR 25365 --- [[ACTIVE] ExecuteThread: '38' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.g.a.c.c.e.Error500Controller : 捕获到错误: NullPointerException: null 2025-10-24 10:45:46.827 ERROR 25365 --- [[ACTIVE] ExecuteThread: '8' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.g.a.c.c.e.Error500Controller : 捕获到错误: NullPointerException: null 2025-10-24 10:45:46.952 ERROR 25365 --- [[ACTIVE] ExecuteThread: '50' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.group.apps.core.aop.ConsolePrintAop : 抛出异常 : null 2025-10-24 10:45:47.236 ERROR 25365 --- [[ACTIVE] ExecuteThread: '20' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.group.apps.core.aop.ConsolePrintAop : 抛出异常 : null 2025-10-24 10:45:47.331 ERROR 25365 --- [[ACTIVE] ExecuteThread: '50' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.g.a.c.c.e.Error500Controller : 捕获到错误: NullPointerException: null 2025-10-24 10:45:47.692 ERROR 25365 --- [[ACTIVE] ExecuteThread: '43' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.group.apps.core.aop.ConsolePrintAop : 抛出异常 : null 2025-10-24 10:45:47.840 ERROR 25365 --- [[ACTIVE] ExecuteThread: '66' for queue: 'weblogic.kernel.Default (self-tuning)'] o.s.b.w.servlet.support.ErrorPageFilter : Cannot forward to error page for request [/coa/coaSignOffPage] as the response has already been committed. As a result, the response may have the wrong status code. If your application is running on WebSphere Application Server you may be able to resolve this problem by setting com.ibm.ws.webcontainer.invokeFlushAfterService to false freemarker.core.InvalidReferenceException: The following has evaluated to null or missing: ==> Session["_USER_COMPANY_"] [in template "layout/jsPlugins.ftl" at line 66, column 45] ---- Tip: It's the final [] step that caused this error, not those before it. ---- Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)?? ---- ---- FTL stack trace ("~" means nesting-related): - Failed at: ${Session["_USER_COMPANY_"].companyCo... [in template "layout/jsPlugins.ftl" at line 66, column 43] - Reached through: #include "jsPlugins.ftl" [in template "layout/layout.ftl" in macro "sectionBody" at line 39, column 1] - Reached through: @sectionBody [in template "error/500.ftl" at line 7, column 1] ---- at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.UnexpectedTypeException.newDescriptionBuilder(UnexpectedTypeException.java:85) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.UnexpectedTypeException.<init>(UnexpectedTypeException.java:48) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.NonHashException.<init>(NonHashException.java:49) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Dot._eval(Dot.java:48) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Expression.eval(Expression.java:101) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.BuiltInsForExistenceHandling$ExistenceBuiltIn.evalMaybeNonexistentTarget(BuiltInsForExistenceHandling.java:52) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.BuiltInsForExistenceHandling$if_existsBI._eval(BuiltInsForExistenceHandling.java:129) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Expression.eval(Expression.java:101) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.DollarVariable.calculateInterpolatedStringOrMarkup(DollarVariable.java:100) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.DollarVariable.accept(DollarVariable.java:63) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Environment.visit(Environment.java:334) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Environment.visit(Environment.java:340) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Environment.include(Environment.java:2925) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Include.accept(Include.java:171) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Environment.visit(Environment.java:370) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Environment.invokeMacroOrFunctionCommonPart(Environment.java:876) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Environment.invokeMacro(Environment.java:812) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.UnifiedCall.accept(UnifiedCall.java:84) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Environment.visit(Environment.java:334) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Environment.visit(Environment.java:340) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Environment.process(Environment.java:313) ~[freemarker-2.3.30.j 啥错
10-25
在布局模板中加入判断： ```ftl ["_USER_COMPANY_"]??> <#include "jsPlugins.ftl"> ``` 或者更彻底的做法： > ❗ 错误页模板单独拆出来，完全不引入任何需要登录的数据。 --- ### ✅ 方案四：配置 WebLogic ...
add.ftl和edit.ftl文件都调用了同一个ftl文件，但是前端显示的效果不一致，这是什么原因
09-28
在使用 FreeMarker（`.ftl`）模板引擎的项目中，`add.ftl` 和 `edit.ftl` 都调用了同一个公共子模板（比如 `_form.ftl`），但前端显示效果不一致，这是一个常见问题。 下面我们从 **可能的原因、排查方法、解决方案...
2025-10-24 10:45:48.150 ERROR 25365 --- [[ACTIVE] ExecuteThread: '43' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.g.a.c.c.e.Error500Controller : 捕获到错误: NullPointerException: null 2025-10-24 10:45:48.158 ERROR 25365 --- [[ACTIVE] ExecuteThread: '76' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.group.apps.core.aop.ConsolePrintAop : 抛出异常 : null 2025-10-24 10:45:48.184 ERROR 25365 --- [[ACTIVE] ExecuteThread: '104' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.g.a.c.c.e.Error500Controller : 捕获到错误: NullPointerException: null 2025-10-24 10:45:48.319 ERROR 25365 --- [[ACTIVE] ExecuteThread: '29' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.g.a.c.c.e.Error500Controller : 捕获到错误: NullPointerException: null 2025-10-24 10:45:48.469 ERROR 25365 --- [[ACTIVE] ExecuteThread: '76' for queue: 'weblogic.kernel.Default (self-tuning)'] c.o.g.a.c.c.e.Error500Controller : 捕获到错误: NullPointerException: null 2025-10-24 10:45:48.520 ERROR 25365 --- [[ACTIVE] ExecuteThread: '20' for queue: 'weblogic.kernel.Default (self-tuning)'] o.s.b.w.servlet.support.ErrorPageFilter : Cannot forward to error page for request [/coa/coaSignOffPage] as the response has already been committed. As a result, the response may have the wrong status code. If your application is running on WebSphere Application Server you may be able to resolve this problem by setting com.ibm.ws.webcontainer.invokeFlushAfterService to false freemarker.core.InvalidReferenceException: The following has evaluated to null or missing: ==> Session["_USER_COMPANY_"] [in template "layout/jsPlugins.ftl" at line 66, column 45] ---- Tip: It's the final [] step that caused this error, not those before it. ---- Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)?? ---- ---- FTL stack trace ("~" means nesting-related): - Failed at: ${Session["_USER_COMPANY_"].companyCo... [in template "layout/jsPlugins.ftl" at line 66, column 43] - Reached through: #include "jsPlugins.ftl" [in template "layout/layout.ftl" in macro "sectionBody" at line 39, column 1] - Reached through: @sectionBody [in template "error/500.ftl" at line 7, column 1] ---- at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.UnexpectedTypeException.newDescriptionBuilder(UnexpectedTypeException.java:85) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.UnexpectedTypeException.<init>(UnexpectedTypeException.java:48) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.NonHashException.<init>(NonHashException.java:49) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Dot._eval(Dot.java:48) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Expression.eval(Expression.java:101) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.BuiltInsForExistenceHandling$ExistenceBuiltIn.evalMaybeNonexistentTarget(BuiltInsForExistenceHandling.java:52) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.BuiltInsForExistenceHandling$if_existsBI._eval(BuiltInsForExistenceHandling.java:129) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Expression.eval(Expression.java:101) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.DollarVariable.calculateInterpolatedStringOrMarkup(DollarVariable.java:100) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.DollarVariable.accept(DollarVariable.java:63) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Environment.visit(Environment.java:334) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Environment.visit(Environment.java:340) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Environment.include(Environment.java:2925) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Include.accept(Include.java:171) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Environment.visit(Environment.java:370) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Environment.invokeMacroOrFunctionCommonPart(Environment.java:876) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Environment.invokeMacro(Environment.java:812) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.UnifiedCall.accept(UnifiedCall.java:84) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Environment.visit(Environment.java:334) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Environment.visit(Environment.java:340) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.core.Environment.process(Environment.java:313) ~[freemarker-2.3.30.jar:2.3.30] at freemarker.template.Template.process(Template.java:383) ~[freemarker-2.3.30.jar:2.3.30] at org.springframework.web.servlet.view.freemarker.FreeMarkerView.processTemplate(FreeMarkerView.java:391) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE] at org.springframework.web.servlet.view.freemarker.FreeMarkerView.doRender(FreeMarkerView.java:304) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE] at org.springframework.web.servlet.view.freemarker.FreeMarkerView.renderMergedTemplateModel(FreeMarkerView.java:255) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE] at org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel(AbstractTemplateView.java:179) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE] at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:316) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE] at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1373) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE] at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1118) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1057) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE] at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:687) ~[javax.servlet.javax.servlet-api.jar:3.1.0] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.6.RELEASE.jar:5.2.6.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) ~[javax.servlet.javax.servlet-api.jar:3.1.0] at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:295) ~[com.oracle.weblogic.servlet.jar:12.2.1.4] at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:260) ~[com.oracle.weblogic.servlet.jar:12.2.1.4] at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:137) ~[com.oracle.weblogic.servlet.jar:12.2.1.4] at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:353) ~[com.oracle.weblogic.servlet.jar:12.2.1.4] at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:25) ~[com.oracle.weblogic.servlet.jar:12.2.1.4] at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:78) [com.oracle.weblogic.servlet.jar:12.2.1.4] at com.oda.group.apps.weaver.sso.filter.LoginFilter.doFilter(LoginFilter.java:122) ~[framework-weaver-3.0.0-SNAPSHOT.jar:3.0.0-SNAPSHOT] at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:78) [com.oracle.weblogic.servlet.jar:12.2.1.4] at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123) ~[druid-1.1.10.jar:1.1.10] at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:78) [com.oracle.weblogic.servlet.jar:12.2.1.4] at org.jasig.cas.client.util.AssertionThreadLocalFilter.doFilter(AssertionThreadLocalFilter.java:50) ~[cas-client-core-3.4.1.jar:3.4.1] at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:78) [com.oracle.weblogic.servlet.jar:12.2.1.4] at org.jasig.cas.client.util.HttpServletRequestWrapperFilter.doFilter(HttpServletRequestWrapperFilter.java:71) ~[cas-client-core-3.4.1.jar:3.4.1] at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:78) [com.oracle.weblogic.servlet.jar:12.2.1.4] at org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:155) ~[cas-client-core-3.4.1.jar:3.4.1] at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:78) [com.oracle.weblogic.servlet.jar:12.2.1.4] at org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:236) ~[cas-client-core-3.4.1.jar:3.4.1] at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:78) [com.oracle.weblogic.servlet.jar:12.2.1.4] 会导致 调用analyseXml为null吗
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10-25
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freemarker中显示某对象使用${name}. 但如果name为null，freemarker就会报错。如果需要判断对象是否为空： <#if name??> …… </#if> 当然也可以通过设置默认值${name!’’}来避免对象为空的错误。如果name为空，就以默认值（“!”后的字符）显示。 对象user，name为user的属性的情况，user，name都有可能为空，那么可以写成${(user.name)!’’},表示user或者name为null，都显示.
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