tomcat登录报404错误

之前部署运行一切正常，在本地运行也一切正常，可以排除是代码的问题。查看日志，错误如下：

Dec 01, 2016 10:11:26 AM org.apache.catalina.session.StandardManager doUnload
SEVERE: IOException while saving persisted sessions: java.io.FileNotFoundException: /home/isearch/program/apache-tomcat-7.0.59/work/Catalina/localhost/LogPresentTest/SESSIONS.ser (Permission denied)
java.io.FileNotFoundException: /home/isearch/program/apache-tomcat-7.0.59/work/Catalina/localhost/LogPresentTest/SESSIONS.ser (Permission denied)
        at java.io.FileOutputStream.open(Native Method)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:221)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:110)
        at org.apache.catalina.session.StandardManager.doUnload(StandardManager.java:384)
        at org.apache.catalina.session.StandardManager.unload(StandardManager.java:351)
        at org.apache.catalina.session.StandardManager.stopInternal(StandardManager.java:516)
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
        at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5715)
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
        at org.apache.catalina.core.StandardContext.reload(StandardContext.java:4026)
        at org.apache.catalina.startup.HostConfig.reload(HostConfig.java:1479)
        at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1462)
        at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1646)
        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:328)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
        at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
        at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1374)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1546)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1556)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1524)
        at java.lang.Thread.run(Thread.java:744)

Dec 01, 2016 10:11:26 AM org.apache.catalina.session.StandardManager stopInternal
SEVERE: Exception unloading sessions to persistent storage

WARNING: Failed to delete generated class file [/home/isearch/program/apache-tomcat-7.0.59/work/Catalina/localhost/LogPresentTest/org/apache/jsp/login_jsp.class]
Dec 01, 2016 10:11:33 AM org.apache.jasper.compiler.Compiler removeGeneratedFiles
WARNING: Failed to delete generated Java file [/home/isearch/program/apache-tomcat-7.0.59/work/Catalina/localhost/LogPresentTest/org/apache/jsp/login_jsp.java]
Dec 01, 2016 10:11:33 AM org.apache.jasper.compiler.Compiler generateJava
WARNING: Failed to delete generated Java file [/home/isearch/program/apache-tomcat-7.0.59/work/Catalina/localhost/LogPresentTest/org/apache/jsp/login_jsp.java]
Dec 01, 2016 10:11:37 AM org.apache.jasper.compiler.Compiler removeGeneratedClassFiles

解决方案：

1.权限问题，使用chmod赋予权限；

2.有可能是之前是在root权限下部署的web项目，切换用户之后权限不够，可以手动删除/work/Catalina/localhost下的文件夹，然后重新部署即可。

http://blog.csdn.net/perhaps9329/article/details/53421627

报404错误和500错误

原因：之前用root启动，他的账号访问不了root启动遗留的一些临时文件，解决办法手动删除/work/Catalina/localhost下的文件夹