SSH2 503 error

Today deploy the project to tomcat , start tomcat, 503 error after access to the project .
now can not find the error message , how the 503 error message printed on the specified page ?
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and 404 belong to one kind of error codes. . .
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errors on 404,503 page -friendly Jumplines I know, I was trying to print specific information to the wrong page, how dare ?   amount . . . This I really did not come across it, wait for the experts . . .
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are plus log log is not on
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you can use in the service side .. What struts.add add error message on the client using the struts tag displayed an error message ah
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in web.xml configuration:

404
/ error/e-404.html


500
/ error/e-500.jsp

like this configuration.
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Service unavailable
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struts configuration can also
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can do , " I remember 503 is the server has not been started successfully it, seeking answers
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for 404 503 page errors prompt and friendly jump I know, I was trying to print specific information to the wrong page, how dare ?
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Thank you for your answer , the problem is not resolved, the project is struts2, spring, openJPA framework to do, after the package into tomcat linux under pressure , the newspaper after starting tomcat 503 error page , the background check tomcat startup log , suggesting class class is not loaded into the spring package file. The solution is to lower the spring of spring-agent.jar, spring-tomcat-weaver.jar apache package into the directory lib directory. Also reported a 503 error if so, to see what is wrong under the spool file prompt , check the error message is in the apache logs directory / catalina.out file , if you still not able to find a certain kind of thing, to see whether the proposed package is missing jar under files. Thank you .