HTTP ERROR: 503
Problem accessing /. Reason:
Service Unavailable
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1 这什么个情况？同样的war包部署版本号3里面，出现这个问题，部署到版本号0,1等正常，感觉部署过后，下次替换war包还有残留文件，如何将当前版本里面的东西清除干净?
2 使用了jstl标签库的war包部署后，访问时会报如下异常：
HTTP ERROR 500
Problem accessing /index.jsp. Reason:
access denied (java.io.FilePermission \ read)
Caused by:java.security.AccessControlException: access denied (java.io.FilePermission \ read)at java.security.AccessControlContext.checkPermission(AccessControlContext.java:393)at java.security.AccessController.checkPermission(AccessController.java:553)at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)at org.eclipse.jetty.security.CustomSecurityManager.checkPermission(CustomSecurityManager.java:39)at java.lang.SecurityManager.checkRead(SecurityManager.java:888)at java.util.zip.ZipFile.<init>(ZipFile.java:126)at java.util.jar.JarFile.<init>(JarFile.java:150)at java.util.jar.JarFile.<init>(JarFile.java:87)at sun.net.www.protocol.jar.URLJarFile.<init>(URLJarFile.java:90)at sun.net.www.protocol.jar.URLJarFile.getJarFile(URLJarFile.java:66)at sun.net.www.protocol.jar.JarFileFactory.get(JarFileFactory.java:71)at sun.net.www.protocol.jar.JarURLConnection.connect(JarURLConnection.java:122)，（引用了c标签后）
哪位高手路过帮忙解决下