java.lang.ClassNotFoundException:org.springframework.instrument.classloading.tomcat.TomcatInstrumentableClassLoader

Question

我将spring.jar文件放在我的lib文件夹中,但仍然有错误

 at org.apache.jsp.index_jsp._jspInit(index_jsp.java:23)
 at org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:52)
 at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:159)
 at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
 at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
 at java.lang.Thread.run(Unknown Source)

和网页给我错误

HTTP状态500 -

我该如何解决？

Answer 1

如果要在Tomcat上配置加载时间编织,则需要将其org.springframework.instrument.tomcat.jar放入Tomcat安装目录的lib文件夹中,如文档中所述.

否则,如果您不需要它并且意外使用了错误context.xml,则需要从中删除<Loader>元素.

Answer 2

每当您看到具有这种效果的异常（即 a ClassNotFoundException）时：

java.lang.ClassNotFoundException: xx.xxx.class.ClassName

您必须知道（来自 ClassNotFoundException 的 JavaDoc）：

找不到具有指定名称的类的定义。

在这种情况下，com.vaannila.service.UserServiceImpl无法找到（来自错误日志：）java.lang.ClassNotFoundException: com.vaannila.service.UserServiceImpl。

确保您的项目中包含 jar 文件（包含com.vaanila.service.UserServiceImpl）。