About possible reasons for the exception IllegalArgumentException

During this time the teacher to complete a small project, the teacher gives some source. I got to run here and found there is always a IllegalArgumentException exception tagging behind several Chinese characters: the page. . . I forgot what it is. I checked online and no related solutions. I transferred the day before to find the error, turned out to be a teacher of jsp pages of code import label finally add a semicolon . The last thought for a moment reason may be that the teacher tomcat with a low version (I remember the teacher is tomcat 5.0 ), this grammar requirement is not so stringent, when my tomcat is a 8.5 , it should be more than grammar lower version as strict, so was an error. However, this question is generally the case of a larger difference between the versions gap will occur, under normal circumstances basically very few people will encounter.