Hi All
im currently testing tomcat 3.2.1 to check if it is suitable for a produktion
environment.
i do some load tests with ab and Curl to get a few numbers how tomcat scales
over CPU´s
and or mashines. I have to ore more apache with mod_jserv behind a lvs
loadbalancer.
every apache is configured to balance to ajpv12 traffic to two tomcat instances
on two
mashines running linux with jdk1.3.
no i started doing some basic load tests with the simple bust useful ab from the
apache
group.
first i tried to get a simple one-line jsp with 10 concurent sessions
-> everything ist fine
with 50 concurent sessions i got a lot of the follwing exeptions:
java.lang.NullPointerException
at java.util.Hashtable.put(Hashtable.java:380)
at
org.apache.jasper.runtime.PageContextImpl.setAttribute(PageContextImpl.java:251)
at
org.apache.jasper.runtime.PageContextImpl._initialize(PageContextImpl.java:198)
at
org.apache.jasper.runtime.PageContextImpl.initialize(PageContextImpl.java:149)
at
org.apache.jasper.runtime.JspFactoryImpl.getPageContext(JspFactoryImpl.java:99)
at
_0002ftest_0002ejsptest_jsp_1._jspService(_0002ftest_0002ejsptest_jsp_1.java:47)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:177)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:318)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:391)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
at org.apache.tomcat.core.Handler.service(Handler.java:286)
at
org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
at
org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
at
org.apache.tomcat.service.connector.Ajp12ConnectionHandler.processConnection(Ajp12ConnectionHandler.java:166)
at
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
at
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
at java.lang.Thread.run(Thread.java:484)
in org/apache/jasper/runtime/PageContextImpl.java
i found the following
/*
* fields
*/
// per Servlet state
protected Servlet servlet;
protected ServletConfig config;
protected ServletContext context;
protected JspFactory factory;
protected boolean needsSession;
protected String errorPageURL;
protected boolean autoFlush;
protected int bufferSize;
// page scope attributes
protected transient Hashtable attributes = new Hashtable(16);
^^^^^^^
// per request state
protected transient ServletRequest request;
protected transient ServletResponse response;
protected transient Object page;
protected transient HttpSession session;
// initial output stream
protected transient JspWriter out;
}
######
another problem i´ve found is with tomcat configuration
When i specified a single Address to bind in the AJP12 Connector Settings in
server.xml like
<Connector className="org.apache.tomcat.service.PoolTcpConnector">
<Parameter
name="handler"
value="org.apache.tomcat.service.connector.Ajp12ConnectionHandler"/>
<Parameter
name="inet"
value="185.29.1.97"/>
<Parameter
name="port"
value="8007"/>
..........
Tomcat starts and realy it binds to the specified address
but when i try to stop tomcat i get a connection refused.
in org/apache/tomcat/tasj/StopTomcat.java
i found the following
// use Ajp12 to stop the server...
try {
Socket socket = new Socket("localhost", portInt);
^^^^^^^^^^^^^^^^^^^^^^
OutputStream os=socket.getOutputStream();
byte stopMessage[]=new byte[2];
stopMessage[0]=(byte)254;
stopMessage[1]=(byte)15;
os.write( stopMessage );
socket.close();
} catch(Exception ex ) {
ex.printStackTrace();
}
}
}
Im sorry but im not really familiar with java nor a programmer but please give
me some hints how to solve..
greetings in advance
Stefan Majer
Advance Bank AG
Putzbrunnerstrasse 71
Munich
Germany
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