My linux world » Tomcat Survival Guide

Memory

CATALINA_OPTS is used to control Tomcat environment options, whereas JAVA_OPTS controls the environment options at a higher level ie. for any Java library.

In $CATALINA_HOME/bin/startup.sh or in your shell enter the following command:

   export CATALINA_OPTS=”-Xms1024m -Xmx1024m”

Context File

  <?xml version="1.0" encoding="UTF-8"?>
  <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
  <Context path="/myWebAppName" antiJARLocking="true" antiResourceLocking="true">
    <Resource 
       name="jdbc/EmployeeDB" 
       auth="Container"
       type="javax.sql.DataSource" 
       username="dbusername" 
       password="dbpassword"
       driverClassName="org.hsql.jdbcDriver" 
       url="jdbc:HypersonicSQL:database"
       maxActive="8" 
       maxIdle="4"
     />
 
     <Parameter name="myParameterName" value="myParameterValue" override="false"/>
 
  </Context>

Properties	Description
driverClassName	Fully qualified Java class name of the JDBC driver to be used.
username	Database username to be passed to our JDBC driver.
password	Database password to be passed to our JDBC driver.
url	Connection URL to be passed to our JDBC driver. (For backwards compatibility, the property driverName is also recognized.)
initialSize	The initial number of connections that will be created in the pool during pool initialization. Default: 0
maxActive	The maximum number of connections that can be allocated from this pool at the same time. Default: 8
minIdle	The minimum number of connections that will sit idle in this pool at the same time. Default: 0
maxIdle	The maximum number of connections that can sit idle in this pool at the same time. Default: 8
maxWait	The maximum number of milliseconds that the pool will wait (when there are no available connections) for a connection to be returned before throwing an exception. Default: -1 (infinite)
antiJARLocking	If true, the Tomcat classloader will take extra measures to avoid JAR file locking when resources are accessed inside JARs through URLs. This will impact startup time of applications, but could prove to be useful on platforms or configurations where file locking can occur. If not specified, the default value is false.
antiResourceLocking	If true, Tomcat will prevent any file locking. This will significantly impact startup time of applications, but allows full webapp hot deploy and undeploy on platforms or configurations where file locking can occur. If not specified, the default value is false.

Properties

Description

driverClassName

Fully qualified Java class name of the JDBC driver to be used.

username

Database username to be passed to our JDBC driver.

password

Database password to be passed to our JDBC driver.

url

Connection URL to be passed to our JDBC driver. (For backwards compatibility, the property driverName is also recognized.)

initialSize

The initial number of connections that will be created in the pool during pool initialization. Default: 0

maxActive

The maximum number of connections that can be allocated from this pool at the same time. Default: 8

minIdle

The minimum number of connections that will sit idle in this pool at the same time. Default: 0

maxIdle

The maximum number of connections that can sit idle in this pool at the same time. Default: 8

maxWait

The maximum number of milliseconds that the pool will wait (when there are no available connections) for a connection to be returned before throwing an exception. Default: -1 (infinite)

antiJARLocking

If true, the Tomcat classloader will take extra measures to avoid JAR file locking when resources are accessed inside JARs through URLs. This will impact startup time of applications, but could prove to be useful on platforms or configurations where file locking can occur. If not specified, the default value is false.

antiResourceLocking

If true, Tomcat will prevent any file locking. This will significantly impact startup time of applications, but allows full webapp hot deploy and undeploy on platforms or configurations where file locking can occur. If not specified, the default value is false.