一个奇怪的问题：tomcat 栈溢出 StackOverflowError错误

一个栈溢出错误：

ava.lang.StackOverflowErrorat org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:971)at >>>>>>>>>>>>>>>>>>> 中间省略几百行同样的内容 <<<<<<<<<<<<<<<<<<<<<<<
org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:971)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:971)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:971)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:971)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:971)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:971)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:971)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:971)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:971)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:971)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:971)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:971)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:971)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:971)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:971)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:971)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:971)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:996)at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:971)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:873)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967)at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:869)at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843)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.logging.log4j.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:64)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:728)

tomcat版本是8.5.38版本，spring是4.2.6.RELEASE，出错的代码也找到了：
DispatcherServlet：

protected void doService(HttpServletRequest request, HttpServletResponse response) throws Exception {if (logger.isDebugEnabled()) {String resumed = WebAsyncUtils.getAsyncManager(request).hasConcurrentResult() ? " resumed" : "";logger.debug("DispatcherServlet with name '" + getServletName() + "'" + resumed +" processing " + request.getMethod() + " request for [" + getRequestUri(request) + "]");}// Keep a snapshot of the request attributes in case of an include,// to be able to restore the original attributes after the include.Map<String, Object> attributesSnapshot = null;if (WebUtils.isIncludeRequest(request)) {attributesSnapshot = new HashMap<String, Object>();Enumeration<?> attrNames = request.getAttributeNames();while (attrNames.hasMoreElements()) { //这个地方死循环了String attrName = (String) attrNames.nextElement();if (this.cleanupAfterInclude || attrName.startsWith("org.springframework.web.servlet")) {attributesSnapshot.put(attrName, request.getAttribute(attrName));}}}.....
}

ApplicationHttpRequest中的内部类AttributeNamesEnumerator：

  @Overridepublic boolean hasMoreElements() {return ((pos != last) || (next != null)|| ((next = findNext()) != null));}protected String findNext() {String result = null;while ((result == null) && (parentEnumeration.hasMoreElements())) {String current = parentEnumeration.nextElement();if (!isSpecial(current)) {result = current;}}return result;}

从错误日志上来看，先调用hasMoreElements，再调用findNext，以此为循环，直到栈溢出。

不知道怎么回事，只找到一篇tomcat的issue，有知道的指点一些。

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一个奇怪的问题：tomcat 栈溢出 StackOverflowError错误

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