org.apache.jasper.JasperException: Unable to compile class for JSP 解決方案

org.apache.jasper.JasperException: Unable to compile class for JSP 解決方案

 

（最近經常在論壇上看到問這個錯誤的朋友，這幾天不下於4次了，在網上搜集整理一下，大家參考一下）

 

1，檢查是否將classpath設定錯誤：正確的為.;%java_home%/lib/rt.jar;%java_home%/lib/tools.jar  <!--java_home is your jdk directory-->2，This   can   usually   be   solved   by   copying   manually   $JAVA_HOME/lib/tools.jar   from   the   JDK    
  to   the   common/lib   directory   of   the   Tomcat   server,   followed   by   a   Tomcat   restart.       
  看到了嗎？  
  把jdk安裝目錄下的lib/tools.jar拷貝到tomcat安裝目錄下的common/lib目錄下，然後重啟tomcat，試試   。3,設定tomcat的字元集為GBK，預防亂碼的產生：F:/Tomcat 5.0/conf目錄下的server.xml中增加一個參數URIEncoding="GBK"for example:    <Connector  URIEncoding="GBK"
port="8080"      maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" redirectPort="8443" acceptCount="100"
               debug="0" connectionTimeout="20000"
               disableUploadTimeout="true" />4,增大tomcat的jvm記憶體使用量參數：在F:/Tomcat 5.0/bin目錄下的catalina.bat檔案中增加set JAVA_OPTS=-Xms256m -Xmx512mfor example:  the first word is added by us.set JAVA_OPTS=-Xms384m -Xmx768m
set _EXECJAVA=%_RUNJAVA%
set MAINCLASS=org.apache.catalina.startup.Bootstrap
set ACTION=start
set SECURITY_POLICY_FILE=
set DEBUG_OPTS=
set JPDA=