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java.lang.IllegalArgumentException: Can't convert argument: null
Tomcat6.0+myeclipse,   普通servlet,出现如下错误,高手给侃侃  
java.lang.IllegalArgumentException:   Can 't   convert   argument:   null 
 	at   org.apache.tomcat.util.IntrospectionUtils.convert(IntrospectionUtils.java:976) 
 	at   org.apache.tomcat.util.digester.CallMethodRule.end(CallMethodRule.java:523) 
 	at   org.apache.tomcat.util.digester.Rule.end(Rule.java:229)
------解决方案--------------------Can 't convert argument--转化错误吧,具体情况LZ将代码发下