使用JProfiler出现UnsupportedEncodingException: EUC_CN异常

环境: MyEclipse+Tomcat5+spring+Hibernate+struts隔几天就出现无法登录的情况, 于是想用JProfiler来检查, 但运行JProfiler的任务后访问登录页出现下列异常, 谁知道这是怎么回事? JProfiler为4.1.3java.io.UnsupportedEncodingException: EUC_CN
sun.io.Converters.getConverterClass(Unknown Source)
sun.io.Converters.newConverter(Unknown Source)
sun.io.ByteToCharConverter.getConverter(Unknown Source)
java.lang.StringCoding.decode(Unknown Source)
java.lang.String.<init>(Unknown Source)
java.lang.String.<init>(Unknown Source)
org.apache.catalina.connector.Request.setCharacterEncoding(Request.java:1420)
org.apache.catalina.connector.RequestFacade.setCharacterEncoding(RequestFacade.java:295)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:73)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)