Tomcat：不允许修改锁定的 ParameterMap答案

【问题标题】：Tomcat: No modifications are allowed to a locked ParameterMapTomcat：不允许修改锁定的 ParameterMap
【发布时间】：2017-05-12 22:51:59
【问题描述】：

厌倦了这个恼人的错误：

java.lang.IllegalStateException: No modifications are allowed to a locked ParameterMap
at org.apache.catalina.util.ParameterMap.put(ParameterMap.java:164)
at org.springframework.data.rest.webmvc.RestRepositoryEntityController.getParametersForPostAction(RestRepositoryEntityController.java:182)
at org.springframework.data.rest.webmvc.RestRepositoryEntityController.performPostAction(RestRepositoryEntityController.java:158)
at org.springframework.data.rest.webmvc.RestRepositoryEntityController.performOneArgumentPostRepositoryAction(RestRepositoryEntityController.java:90)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:776)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:705)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:747)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:485)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:410)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:337)

我在尝试访问一些休息资源后得到了这个。在生产中一切正常，所以我想我的本地电脑上存在一些 tomcat 问题。花了两个小时试图找到答案，但没有成功。

有人遇到同样的错误吗？需要帮助！

【问题讨论】：

在我看来，您正在尝试回收/重用某些 ParameterMap，但您不能这样做（如错误消息所述）。尝试创建一个新的 ParameterMap

标签： java spring rest tomcat spring-rest

【解决方案1】：

没有找到这种行为的任何原因。唯一有帮助的 - 我将 tomcat 版本从 7.0.68 更改为 7.0.61

【讨论】：

【解决方案2】：

这可能是因为您正在分配 request.getParameterMap() 任何变量。而不是尝试使用

Map<String, String[]> map = new HashMap<>(request.getParameterMap());

which will only create a copy of it.

有时这可能会解决您的问题

【讨论】：