嚴重: Servlet.service() for servlet DispatcherServlet threw exception
java.lang.StackOverflowError
 at org.apache.catalina.core.applicationHttPRequest$AttributeNamesEnumerator.nextElement(ApplicationHttpRequest.java:950)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.nextElement(ApplicationHttpRequest.java:923)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:968)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:942)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:967)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:942)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:967)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:942)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:967)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:942)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:967)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:942)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:967)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:942)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:967)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:942)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:967)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:942)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:967)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:942)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:967)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:942)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:967)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:942)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:967)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:942)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:967)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:942)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:967)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.hasMoreElements(ApplicationHttpRequest.java:942)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator.findNext(ApplicationHttpRequest.java:967)
 at org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEn