I run a servlet on tomcat 5.5.27, jvm 1.6.0_10-b33, and fedora
2.6.21.7-2.fc8xen. The service has a problem: after running for a
certain time, the servlet becomes unavailable because of "too many
open files" exception:
2010-05-13 23:58:14,575 DEBUG - Reload config...
2010-05-13 23:58:14,575 ERROR - java.io.FileNotFoundException:
/root/Applications/tomcat-dev/webapps/MyServices/WEB-INF/classes/conf/MyConf.properties
(Too many open files)
To find out actually what files were opened too many times, I listed
all of them and some of them are shown below:
...
java 11515 root 282r REG 8,1 197 182030
/root/Applications/tomcat-dev/conf/Catalina/localhost/._manager.xml
java 11515 root 283r REG 8,1 197 182028
/root/Applications/tomcat-dev/conf/Catalina/localhost/._host-manager.xml
java 11515 root 284r REG 8,1 197 182032
/root/Applications/tomcat-dev/conf/Catalina/localhost/._Push.xml
java 11515 root 285r REG 8,1 197 182030
/root/Applications/tomcat-dev/conf/Catalina/localhost/._manager.xml
java 11515 root 286r REG 8,1 197 182028
/root/Applications/tomcat-dev/conf/Catalina/localhost/._host-manager.xml
java 11515 root 287r REG 8,1 197 182032
/root/Applications/tomcat-dev/conf/Catalina/localhost/._Push.xml
java 11515 root 288r REG 8,1 197 182028
/root/Applications/tomcat-dev/conf/Catalina/localhost/._host-manager.xml
java 11515 root 289r REG 8,1 197 182032
/root/Applications/tomcat-dev/conf/Catalina/localhost/._Push.xml
java 11515 root 290r REG 8,1 197 182030
/root/Applications/tomcat-dev/conf/Catalina/localhost/._manager.xml
java 11515 root 291r REG 8,1 197 182028
/root/Applications/tomcat-dev/conf/Catalina/localhost/._host-manager.xml
java 11515 root 292r REG 8,1 197 182032
/root/Applications/tomcat-dev/conf/Catalina/localhost/._Push.xml
...
where "java 11515" is tomcat. "MyConf.properties" does not appear on
the above list. So, it is obvious the problem is due to those 3 xml
files. Seems that tomcat keeps opening these 3 xml files until the
limit is reached.
So, my question is why tomcat keeps opening them and what is the
trigger of the operation? For your reference, these 3 files are
listed:
_________Push.xml_______
<!-- The contents of this file will be loaded for each web application -->
<Context>
<!-- Default set of monitored resources -->
<WatchedResource>WEB-INF/web.xml</WatchedResource>
<!-- Uncomment this to disable session persistence across Tomcat
restarts -->
<Manager pathname="" />
<Resource name="jdbc/CEDB" auth="Container" type="javax.sql.DataSource"
maxActive="20" maxIdle="30" maxWait="10000"
username="username" password="secret"
driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://hostname:1234/ABCD?autoReconnect=true"
validationQuery="select count(*) from Partner;"
testOnReturn="true" testWhileIdle="true"
removeAbandoned="true" logAbandoned="true" />
</Context>
_________manager.xml_______
<?xml version="1.0" encoding="UTF-8"?>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!--
Context configuration file for the Tomcat Manager Web App
$Id: manager.xml 565211 2007-08-13 00:09:38Z markt $
-->
<Context docBase="${catalina.home}/server/webapps/manager"
privileged="true" antiResourceLocking="false" antiJARLocking="false">
<!-- Link to the user database we will get roles from -->
<ResourceLink name="users" global="UserDatabase"
type="org.apache.catalina.UserDatabase"/>
</Context>
_________host-manager.xml_______
<?xml version="1.0" encoding="UTF-8"?>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!--
Context configuration file for the Tomcat Host Manager Web App
$Id: host-manager.xml 565211 2007-08-13 00:09:38Z markt $
-->
<Context docBase="${catalina.home}/server/webapps/host-manager"
privileged="true" antiResourceLocking="false" antiJARLocking="false">
</Context>
Any thoughts?
Thanks!
-Michael
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