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Editorial Team
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Asked: 2026-06-13T22:36:58+00:00

I created java dynamic web application in tomcat server 7. it works fine when

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I created java dynamic web application in tomcat server 7. it works fine when I run it from eclipse.

I deployed it by right click on the project and export by following export dialog to the webapp directory of tomcat installation and start the tomcat server so that I can access

http://localhost:8080

but when I try to access 

http://localhost:8080/projectName.

I got below error. 

The requested resource (/projectName/) is not available.

I look into catalina.log file. and found these lines

SEVERE: Error filterStart
SEVERE: Context [/projectName] startup failed due to previous errors
SEVERE: The web application [/projectName] appears to have started a thread named 
[Abandoned connection cleanup thread] but has failed to stop it. This is very
likely to create a memory leak.

further my application is used struts2. I add struts2 jars to the WEB-INF/lib directory. why I can’t access my application from war file?

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1 Answer

  1. Editorial Team

    ok I figured it out my self. I searched the google for 

    SEVERE: Error filterStart

    and found, check the localhost_yyyy_mm_dd.log file for more information about error.

    In that file there was an error called java.lang.UnsupportedClassVersionError. The reason for that was my jdk and jre versions are different.

    So I changed jdk and jre versions as same level from project properties. after that I built the project and exported the project to webApp again. I restart the tomcat server again. All errors are gone.

    reference : Tomcat startup logs – SEVERE: Error filterStart how to get a stack trace?

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