Definig properties files outside you webapp in spring .

[anandraiin3]

Problem Description : I am creating webapp which is a .war and deploying it on JBOSS . I am using IOC feature of spring , and my spring XML looks like

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

<bean class="org.springframework.beans.factory.config.Pr opertyPlaceholderConfigurer">
<property name="location">
<value>classpath:META-INF/prop.properties</value>
</property>
</bean>

<bean id="XYZLogger" class="XYZ.Abc" >
<constructor-arg index="0" value="xyz"/>
<property name="hostName" value="${loggerName}" />
</bean>
</beans>

By using above approach , spring will look for prop.properties in classpath . But if i want to make it configurable i.e i want this path to be specified in JBOSS and spring should look for the properties file at that location only .

below is the solution for it

package a.b.c;
import java.io.File;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.config.PropertyP laceholderConfigurer;
import org.springframework.core.io.Resource;

public class MyPropertyPlaceholderConfigurer extends
PropertyPlaceholderConfigurer {

public static String configPath = "BLANK";
public final Logger propertyPlaceholderConfigurerLogger = Logger
.getLogger(APCPropertyPlaceholderConfigurer.class) ;

@Override
public void setLocation(Resource location) {
Resource[] locations = new Resource[] { location };
Resource[] loc = modifyLocations(locations);
super.setLocations(loc);
}

@Override
public void setLocations(Resource[] location) {
Resource[] locations = location;
Resource[] loc = modifyLocations(locations);
super.setLocations(loc);
}

private Resource[] modifyLocations(Resource[] locations) {
if (!configPath.equals("BLANK")) {
Resource[] myLocation = new Resource[locations.length];
int i = 0;
for (Resource res : locations) {
try {
if (res instanceof org.springframework.core.io.FileSystemResource) {
propertyPlaceholderConfigurerLogger
.debug("FilePath defined in spring Configuration , will not modify this path");
myLocation[i++] = res;
}
else if (res instanceof org.springframework.core.io.ClassPathResource) {
org.springframework.core.io.ClassPathResource res1 = (org.springframework.core.io.ClassPathResource) res;
if (!configPath.endsWith(File.separator))
configPath += File.separator;
org.springframework.core.io.FileSystemResource myClass = new org.springframework.core.io.FileSystemResource(
configPath + res1.getPath());
myLocation[i++] = myClass;
}
else
myLocation[i++] = res;
}
catch (Exception e) {
propertyPlaceholderConfigurerLogger.error(e.getMes sage());
}
}
return myLocation;
}
else {
propertyPlaceholderConfigurerLogger
.error("Config Location for APC Config files not found");
return locations;
}
}

}

You just need to set the config path which can be done from servlet or contextEventListeners for example

package a.b.c;
import javax.servlet.ServletContextEvent;
import org.springframework.web.context.ContextLoaderListe ner;

public class MyContextListener extends ContextLoaderListener {

@Override
public void contextInitialized(ServletContextEvent contextEvent) {
super.contextInitialized(contextEvent);
String configpath = null;
try {
configpath = contextEvent.getServletContext()
.getInitParameter("PropertiesLocation");
if (configpath != null)
MyPropertyPlaceholderConfigurer.configPath = configpath;
}
catch (Exception e) {
System.out.println("Config path not Configured");
}

}
}


and defining following properties in your context.xml

<WatchedResource>WEB-INF/web.xml</WatchedResource>
<Parameter name="PropertiesLocation" value="C:\Prop_Location" override="false"/>

Use MyContextListener in your web.xml

<listener-class>a.b.c.MyContextListener</listener-class>

Modify Spring's bean injection xml file to use MyPropertyPlaceholderConfigurer

<bean class="a.b.c.MyPropertyPlaceholderConfigurer">
<property name="location">
<value>classpath:META-INF/prop.properties</value>
</property>
</bean>

<bean id="XYZLogger" class="XYZ.Abc" >
<constructor-arg index="0" value="xyz"/>
<property name="hostName" value="${loggerName}" />
</bean>
</beans>

[Marten Deinum]

1) When posting code use [ code][/code ] tags.
2) It is a solution to a problem which is already solved.

[anandraiin3]

1) When posting code use [ code][/code ] tags.
2) It is a solution to a problem which is already solved.

thanks for the suggestion ,this was my first post and i am not use to the format .
I posted the solution so as to share with other developers around the world , can't we post solution and problems together .