碰到問題過程如下

問題1：

tomcat啟動良好，localhost:8080訪問成功

但是訪問扔到tomcat上的項目怎樣都是404

解決思路如下：

1. 查找catalina.out，查看啟動log

發現項目有被加載

啟動./startup.sh時發現調用的jre為1.6!

Using CATALINA_BASE:   /usr/local/tomcat7Using CATALINA_HOME:   /usr/local/tomcat7Using CATALINA_TMPDIR: /usr/local/tomcat7/tempUsing JRE_HOME:        /usr/java/jdk1.6.0_25/jreUsing CLASSPATH:       /usr/local/tomcat7/bin/bootstrap.jar:/usr/local/tomcat7/bin/tomcat-juli.jar

項目需要的jdk是1.8并且linux上也已經安裝良好

命令java -version顯示如下

java version "1.8.0_111"Java(TM) SE Runtime Environment (build 1.8.0_111-b14)Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, mixed mode)

而此時系統設置的環境變量 /etc/PRofile 也已經華麗的設置了

export JRE_HOME=/usr/java/jdk1.8.0_111/jre

則解決方法是：

tomcat啟動調用的./startup.sh打開細看會發現它其實調用的是catalina.sh

那么直接粗暴的在catalina.sh第一行粗暴的添加命令

export JRE_HOME=/usr/java/jdk1.8.0_111/jre

保存退出即可

問題2：

依然是將war包扔到webapps下啟動tomcat

catalina.out信息如下：

INFO: Deploying web application archive /usr/local/tomcat7/webapps/Map.warFeb 08, 2017 1:44:39 AM org.apache.catalina.startup.TldConfig executeINFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and jsp compilation time.Feb 08, 2017 1:44:40 AM org.apache.catalina.core.StandardContext startInternalSEVERE: One or more listeners failed to start. Full details will be found in the appropriate container log fileFeb 08, 2017 1:44:40 AM org.apache.catalina.core.StandardContext startInternalSEVERE: Context [/Map] startup failed due to previous errorsFeb 08, 2017 1:44:40 AM org.apache.catalina.startup.HostConfig deployWAR

加載了倒霉蛋war包但是錯誤

則轉戰項目本身的log，在map_info.log中發現報錯，無法找到配置文件

將配置文件拷貝到相應的路徑下面，DONE

問題3：

報錯信息如下（catalina.out）

Feb 09, 2017 12:23:31 AM org.apache.catalina.loader.WebappClassLoaderBase validateJarFileINFO: validateJarFile(/usr/local/tomcat7/webapps/*****/WEB-INF/lib/el-api-2.2.jar) - jar not loaded. See Servlet Spec 3.0, section 10.7.2. Offending class: javax/el/Expression.class

解決方案：

應該是el-api-2.2.jar與tomcat7中的lib里jar包沖突，刪掉項目中的jar包(/WEB-INF/lib)，然后重啟tomcat

以上。