General Performance Tuning

For an overview, please see the slides of the performance session at JavaOne : PerformanceBOFatJavaOne .

One performance factor is the MyFacesExtensionsFilter. The MyFacesExtensionsFilter buffers and parses the response on every request. You can disable this, and still gain all functionality the ExtensionsFilter is providing, by doing two things:

1.) Set the context-param 

    <context-param>
        <param-name>org.apache.myfaces.ADD_RESOURCE_CLASS</param-name>
        <param-value>org.apache.myfaces.component.html.util.StreamingAddResource</param-value>
     </context-param>

for more info, see StreamingAddResource.

2.) Get rid of the <HEAD> tag in your HTML, and instead use Tomahawk's <t:documentHead/> tag. Of course, your <f:view/> tag has to enclose your <t:documentHead/> tag for this to work.

Server Side State Performance Tuning

There are a many settings you can enable in your web.xml file to make MyFaces perform well.

Server side state saving performs better:

    <context-param>
        <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
        <param-value>server</param-value>
     </context-param>

Next step - disable compression of state in server:

    <context-param>
        <param-name>org.apache.myfaces.COMPRESS_STATE_IN_SESSION</param-name>
        <param-value>false</param-value>
     </context-param>

Very important, too, is to disable the serialization of state, serialization and deserialization of the component tree is a major performance hit.

    <context-param>
        <param-name>org.apache.myfaces.SERIALIZE_STATE_IN_SESSION</param-name>
        <param-value>false</param-value>
     </context-param>

If you find that memory is a constraining factor, then reducing the number of views stored in the session might help. The setting is controlled by:

    <context-param>
        <param-name>org.apache.myfaces.NUMBER_OF_VIEWS_IN_SESSION</param-name>
        <param-value>20</param-value>
        <description>Only applicable if state saving method is "server" (= default).
                     Defines the amount (default = 20) of the latest views are stored in session.
        </description>
     </context-param>

Client Side State Performance Tuning

permlink

The JSF spec mandates a large amount of serialization during the lifecycle of each request. This of course cannot be avoided when using client side state saving. MyFaces gives the application developer the opportunity to specify the serialization mechanism for an application. Here are instructions on how one would realize the performance increases available via Jboss serialiazation .

Place the following context parameter in web.xml :

  <context-param>
    <param-name>org.apache.myfaces.SERIAL_FACTORY</param-name>
    <param-value>org.apache.myfaces.JbossSerialFactory</param-value>
  </context-param>

Compile the following classes, or an equivalent of each, and place them in the classpath.

package org.apache.myfaces;

import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import org.apache.myfaces.shared_impl.util.serial.SerialFactory;
import org.jboss.serial.io.JBossObjectOutputStream;

public class JbossSerialFactory implements SerialFactory {

	public ObjectOutputStream getObjectOutputStream(OutputStream stream)throws IOException {
		return new JBossObjectOutputStream(stream);
	}

	public ObjectInputStream getObjectInputStream(InputStream stream)throws IOException {
		return new MyFacesJBossObjectInputStream(stream);
	}

}

package org.apache.myfaces;

import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectStreamClass;
import org.apache.myfaces.shared_impl.util.ClassUtils;
import org.jboss.serial.io.JBossObjectInputStream;

public class MyFacesJBossObjectInputStream extends JBossObjectInputStream {

	public MyFacesJBossObjectInputStream(InputStream stream) throws IOException {
		super(stream);
	}

    protected Class resolveClass(ObjectStreamClass desc)throws ClassNotFoundException, IOException{
    	
	    try{
	        return ClassUtils.classForName(desc.getName());
	    }
	    catch (ClassNotFoundException e){
	        return super.resolveClass(desc);
	    }
    }
	
}

Place jboss-serialization.jar and trove.jar in your classpath.

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