1,tomcat切换用户重启后报错如下：
Aug 29, 2014 2:14:47 PM org.apache.jasper.compiler.Compiler removeGeneratedClassFiles
WARNING: Failed to delete generated class file [/home/joeyon/test/work/Catalina/localhost/_/org/apache/jsp/WEB_INFO/c/common/errorIos_jsp.class]
Aug 29, 2014 2:14:47 PM org.apache.jasper.compiler.Compiler removeGeneratedFiles
WARNING: Failed to delete generated Java file [/home/joeyon/test/work/Catalina/localhost/_/org/apache/jsp/WEB_INFO/c/common/errorIos_jsp.java]
Aug 29, 2014 2:14:47 PM org.apache.jasper.compiler.Compiler generateJava2，导致每次访问页面第一次正常，第二次报错404.通过日志得知，切换用户后，当前js编译后的目录没有权限，修改权限后即可
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