java - 如何更改默认的java方法

Question

我的项目遇到了一些问题(可能是因为 Windows、防病毒或两者)。

发生的是以下错误:

SEVERE: Exception Processing ErrorPage[errorCode=404, location=/404.jsp]
org.apache.jasper.JasperException: org.apache.jasper.JasperException: Unable to compile class for JSP
        at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:565)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:389)
        at org.apache.jasper.servlet.JspServlet._serviceJspFile(JspServlet.java:386)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:40001)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:728)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:472)
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:395)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:316)
        at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:395)
        at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:254)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:177)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:800)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1471)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.jasper.JasperException: Unable to compile class for JSP
        at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:610)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:368)
        ... 26 more
Caused by: java.io.IOException: classFile.delete() failed
        at org.apache.jasper.compiler.SmapUtil$SDEInstaller.install(SmapUtil.java:204)
        at org.apache.jasper.compiler.SmapUtil.installSmap(SmapUtil.java:166)
        at org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:510)
        at org.apache.jasper.compiler.Compiler.__compile(Compiler.java:379)
        at org.apache.jasper.compiler.Compiler.compile(Compiler.java:41002)
        at org.apache.jasper.compiler.Compiler.compile(Compiler.java:351)
        at org.apache.jasper.compiler.Compiler.compile(Compiler.java:335)
        at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:595)
        ... 27 more

看起来 classFile.delete() 试图删除的文件正在使用中。

我们不能在杀毒软件中添加异常(exception)....

我发现 2006 年的一篇帖子说“我的解决方法是修改 SmapUtil 类。如果第一次尝试重命名失败，它会等待 50 毫秒然后重试(根据需要循环)。到目前为止它总是在第二次尝试时有效在 50 毫秒的延迟之后。”

我的问题是，SmapUtil 类位于何处以及如何编辑删除(和重命名)方法？

我在任何地方都找不到这个信息

谢谢

Answer 1

确保您已配置 Tomcat 和 Jasper 以在生产环境中运行。

要解决您的特定问题，您可以将 Jasper 选项 suppressSmap 设置为 true 或预编译您的 JSP 文件 ，或两者兼而有之。

SMAP 为 Jasper 提供 JSR-045 支持；它创建从生成的字节码到源 JSP 文件的映射以帮助调试。

参见 this page有关 Jasper 配置的信息。