Trouble running JSP project on Tomcat

When running a JSP application on Apache Tomcat 4.1.18 ( Java 1.4.2 ) an "Out of Memory" error keeps occurring. The error seems to appear during stress times, indicating that the 256 heap size is all occupied. Tomcat runs Java with 256 MB in heap with the "-Xmx256m" parameter at startup. Raising the heap to 512MB did not help so the heap is not to blame. Maximum session connections, maxProcessors for port 8080, are above stress time connected sessions so they are not causing the error. Database connections are closed on each page and the connection pool has also been raised. There's no pattern in the logs indicating that the code is to blame since the "Out of Memory" error occurs at random places.
To make things worse sometimes the computer freezes without any error thrown and sometimes must be rebooted when restarting the tomcat wont do. Sometimes the server starts but no respond on the JSP pages. To top that it has happened that Tomcat seems to start just fine, but when taking a closer look into the log he dosn't seem to be running, but the JSP pages are happily working. The log file on the other hand stated that Tomcat was no running:
SEVERE: Error initializing endpoint
java.net.BindException: Address already in use:8080
at org.apache.tomcat.util.net.PoolTcpEndpoint.initEndpoint(PoolTcpEndpoint.java:302)
at org.apache.coyote.http11.Http11Protocol.init(Http11Protocol.java:184)
at org.apache.coyote.tomcat4.CoyoteConnector.initialize(CoyoteConnector.java:1229)
at org.apache.catalina.core.StandardService.initialize(StandardService.java:579)
at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:2246)
at org.apache.catalina.startup.Catalina.start(Catalina.java:511)
at org.apache.catalina.startup.Catalina.execute(Catalina.java:400)
at org.apache.catalina.startup.Catalina.process(Catalina.java:180)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:203)
Catalina.start: LifecycleException: Protocol handler initialization failed: java.net.BindException: Address already in use:8080
LifecycleException: Protocol handler initialization failed: java.net.BindException: Address already in use:8080
at org.apache.coyote.tomcat4.CoyoteConnector.initialize(CoyoteConnector.java:1231)
at org.apache.catalina.core.StandardService.initialize(StandardService.java:579)
at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:2246)
at org.apache.catalina.startup.Catalina.start(Catalina.java:511)
at org.apache.catalina.startup.Catalina.execute(Catalina.java:400)
at org.apache.catalina.startup.Catalina.process(Catalina.java:180)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:203)
Catalina.stop: LifecycleException: This server has not yet been started
LifecycleException: This server has not yet been started
at org.apache.catalina.core.StandardServer.stop(StandardServer.java:2213)
at org.apache.catalina.startup.Catalina.start(Catalina.java:543)
at org.apache.catalina.startup.Catalina.execute(Catalina.java:400)
at org.apache.catalina.startup.Catalina.process(Catalina.java:180)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:203)
Anyone have any good ideas?
Is there a chance that the computer is out of memory and can't fill the heap memory since I don't set the Xms parameter?
Could restarting the Tomcat result in a new process that finds the old sessions in the computer memory and keeps on hanging on to them until timeout?

sounds to me like your network adapter/driver is seriously screwy.
I see a really nasty "address already in use" exception. That means that something is still hogging that port, which indicates that tomcat could not cleanly stop itself. One prime suspect when this happens is a non-daemon thread that is still running somewhere. When this happens, Tomcat will wait forever till this thread closes down.
Hope that helps somehow.

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         at org.apache.tomcat.core.Handler.service(Handler.java:287)
         at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
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         at org.apache.tomcat.core.ContextManager.service(ContextManager.java:758)
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    <?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE web-app
    PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
    "http://java.sun.com/j2ee/dtds/web-app_2.2.dtd">
    <servlet>
    <servlet-name>
    R00005Servlet
    </servlet-name>
    <servlet-class>
    HK.com.hit.ebis.servlet.R00005Servlet
    </servlet-class>
    </servlet>
    <servlet-mapping>
    <servlet-name>
    R00005Servlet
    </servlet-name>
    <url-pattern>
    /R00005Servlet
    </url-pattern>
    </servlet-mapping>
    <!-- Default login configuration uses BASIC authentication -->
    <login-config>
    <auth-method>BASIC</auth-method>
    <realm-name>Example Basic Authentication Area</realm-name>
    </login-config>
    <!-- If you want to experiment with form-based logins, comment
    out the <login-config> element above and replace it with
    this one. Note that we are currently using a nonstandard
    authentication method, because the code to support form
    based login is incomplete and only lightly tested. -->
    <!--
    <login-config>
    <auth-method>EXPERIMENTAL_FORM</auth-method>
    <realm-name>Example Form-Based Authentication Area</realm-name>
    <form-login-config>
    <form-login-page>/jsp/security/login/login.jsp</form-login-page>
    <form-error-page>/jsp/security/login/error.jsp</form-error-page>
    </form-login-config>
    </login-config>
    -->
    </web-app>
    Who know the reason, please tell me.
    Regards,
    dsjflsdjf

    put <security-constraint> tag also in your web.xml defining the <web-resource-collection>, <web-resource-name>, <url-pattern> and the
    <role-name>manager</role-name> inside <auth-constraint>, This role-name is important and you have to add this role in your tomcat-users.xml also. See sample web.xml in ..\webapps\manager\WEB-INF
    Dont know if this is the reason why ur problem is coming though,
    Regards,
    Padmanava

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