Eclipse generates war package, deployed on Tomcat, error 404

1. Solution, configure Tomcat's server.xml to be configured under the host node: <context docbase= "C:/soft/apache-tomcat-7.0.42/webapps/aaa.war" path= "/ Hello "reloadable=" true "></Context>

2. Start again, if the error, please go to tomcat log file, to see the specific reason, my second error reason is: Java.lang.OutOfMemoryError:Javaheap space.

OK, size up Tomcat's Catalina.bat JVM startup parameters: Add at the top of this file, for example:

Set java_opts=-xms512m-xmx900m-xx:permsize=128m-xx:maxnewsize=256m-xx:maxpermsize=256m

All right, perfect!!.