Why we can set maxSpareThreads and minSpareThreads at APR Http and APR
AJP threadpools?
I have seen another strange behaviour:
After a small load 100000 requests and two hour no request the
AJP and HTTP Server sockets are closed and threadspools are not running
anymore (running jmx attribute say false).
When signal the process a shutdown. I see following message inside the log:
INFO | jvm 2 | 2005/11/23 22:00:01 | 23.11.2005 22:00:01
org.apache.coyote.ajp.AjpAprProtocol pause
INFO | jvm 2 | 2005/11/23 22:00:01 | INFO: Pausing Coyote AJP/1.3
on ajp-20012
INFO | jvm 2 | 2005/11/23 22:00:02 | 23.11.2005 22:00:02
org.apache.catalina.core.StandardService stop
INFO | jvm 2 | 2005/11/23 22:00:02 | INFO: Stopping service Catalina
INFO | jvm 2 | 2005/11/23 22:00:02 | 23.11.2005 22:00:02
org.apache.catalina.connector.MapperListener destroy
INFO | jvm 2 | 2005/11/23 22:00:02 | WARNUNG: Error unregistering
MBeanServerDelegate
INFO | jvm 2 | 2005/11/23 22:00:02 | java.lang.NullPointerException
INFO | jvm 2 | 2005/11/23 22:00:02 | at
org.apache.catalina.connector.MapperListener.destroy(MapperListener.java:161)
INFO | jvm 2 | 2005/11/23 22:00:02 | at
org.apache.catalina.connector.Connector.stop(Connector.java:1132)
INFO | jvm 2 | 2005/11/23 22:00:02 | at
org.apache.catalina.core.StandardService.stop(StandardService.java:521)
INFO | jvm 2 | 2005/11/23 22:00:02 | at
org.apache.catalina.core.StandardServer.stop(StandardServer.java:734)
INFO | jvm 2 | 2005/11/23 22:00:02 | at
org.apache.catalina.startup.Catalina.stop(Catalina.java:601)
INFO | jvm 2 | 2005/11/23 22:00:02 | at
org.apache.catalina.startup.Catalina.start(Catalina.java:576)
INFO | jvm 2 | 2005/11/23 22:00:02 | at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
INFO | jvm 2 | 2005/11/23 22:00:02 | at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
INFO | jvm 2 | 2005/11/23 22:00:02 | at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
INFO | jvm 2 | 2005/11/23 22:00:02 | at
java.lang.reflect.Method.invoke(Method.java:585)
INFO | jvm 2 | 2005/11/23 22:00:02 | at
org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:275)
INFO | jvm 2 | 2005/11/23 22:00:02 | at
org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
INFO | jvm 2 | 2005/11/23 22:00:02 | at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
INFO | jvm 2 | 2005/11/23 22:00:02 | at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
INFO | jvm 2 | 2005/11/23 22:00:02 | at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
INFO | jvm 2 | 2005/11/23 22:00:02 | at
java.lang.reflect.Method.invoke(Method.java:585)
INFO | jvm 2 | 2005/11/23 22:00:02 | at
org.tanukisoftware.wrapper.WrapperStartStopApp.run(WrapperStartStopApp.java:159)
INFO | jvm 2 | 2005/11/23 22:00:02 | at
java.lang.Thread.run(Thread.java:595)
INFO | jvm 2 | 2005/11/23 22:00:02 | 23.11.2005 22:00:02
org.apache.coyote.http11.Http11AprProtocol destroy
INFO | jvm 2 | 2005/11/23 22:00:02 | INFO: Stopping Coyote HTTP/1.1
on http-20011
INFO | jvm 2 | 2005/11/23 22:00:02 | 23.11.2005 22:00:02
org.apache.catalina.connector.Connector stop
INFO | jvm 2 | 2005/11/23 22:00:02 | SCHWERWIEGEND: Coyote
connector has not been started
---
I have looked inside MapperListener Code
public void destroy() {
try {
ObjectName objectName = new ObjectName(
"JMImplementation:type=MBeanServerDelegate");
mBeanServer.removeNotificationListener(objectName, this);
} catch (Exception e) {
log.warn("Error unregistering MBeanServerDelegate", e);
}
}
But the only chance to get a NPE is that MapperListener was not
initialized!!
Very strange,
Peter
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