Cannot expose bind macro helper springMacroRequestContext because of an existing model object of

本文介绍了一种在SpringBoot项目中遇到的Freemarker与siteMesh集成时出现的异常情况,详细解释了错误原因并提供了解决方案,即调整spring.freemarker.expose-spring-macro-helpers配置项。

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环境 springBoot + Freemark + siteMesh

完整异常:
javax.servlet.ServletException: Cannot expose bind macro helper ‘springMacroRequestContext’ because of an existing model object of the same name
at org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel(AbstractTemplateView.java:164)
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:316)
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1373)
at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1118)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1057)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:645)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:750)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:103)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:103)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:712)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:461)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:384)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312)
at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:394)
at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:253)
at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:348)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:173)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocolConnectionHandler.process(AbstractProtocol.java:868)atorg.apache.tomcat.util.net.NioEndpointConnectionHandler.process(AbstractProtocol.java:868) at org.apache.tomcat.util.net.NioEndpointConnectionHandler.process(AbstractProtocol.java:868)atorg.apache.tomcat.util.net.NioEndpointSocketProcessor.doRun(NioEndpoint.java:1590)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutorWorker.run(ThreadPoolExecutor.java:624)atorg.apache.tomcat.util.threads.TaskThreadWorker.run(ThreadPoolExecutor.java:624) at org.apache.tomcat.util.threads.TaskThreadWorker.run(ThreadPoolExecutor.java:624)atorg.apache.tomcat.util.threads.TaskThreadWrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)

解决方案:
该设置项调整为false

# 设定是否以springMacroRequestContext的形式暴露RequestContext给Spring’s macro library使用
spring.freemarker.expose-spring-macro-helpers=true

根据提供的引用内容,这个错误可能是由于remote模块未正确加载导致的。remote模块是Electron提供的一种方法,可以在渲染进程和主进程之间进行通信。如果remote模块未正确加载,则可能会出现“Cannot read properties of undefined (reading 'getGlobal')”这样的错误。 以下是一些可能的解决方案: 1. 确保在渲染进程中正确加载了remote模块。可以使用以下代码片段来加载remote模块: ```javascript const { remote } = require('electron'); ``` 2. 确保在主进程中正确加载了remote模块。可以使用以下代码片段来加载remote模块: ```javascript const { app, BrowserWindow } = require('electron'); const path = require('path'); const url = require('url'); let mainWindow; function createWindow() { mainWindow = new BrowserWindow({ width: 800, height: 600 }); mainWindow.loadURL(url.format({ pathname: path.join(__dirname, 'index.html'), protocol: 'file:', slashes: true })); mainWindow.on('closed', function () { mainWindow = null; }); } app.on('ready', createWindow); app.on('window-all-closed', function () { if (process.platform !== 'darwin') { app.quit(); } }); app.on('activate', function () { if (mainWindow === null) { createWindow(); } }); // Expose some protected methods require('@electron/remote/main').initialize(); ``` 注意:在Electron 14及更高版本中,remote模块已被弃用。相反,可以使用@electron/remote模块来实现相同的功能。 3. 确保在渲染进程中正确配置了nodeIntegration和enableRemoteModule。可以使用以下代码片段来配置这些选项: ```javascript const { remote } = require('electron'); const { BrowserWindow } = remote; let win = new BrowserWindow({ webPreferences: { nodeIntegration: true, enableRemoteModule: true } }); ``` 注意:在Electron 12及更高版本中,nodeIntegration默认为false。如果需要在渲染进程中使用Node.js模块,则必须将其设置为true。但是,这样做会增加应用程序的安全风险,因此应该谨慎使用。
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