6/20/2011

Jetty to GlassFish Interoperability: Remote EJB Invocation

Jetty-to-GlassFish EJB invocation is similar to Tomcat-to-GlassFish case. I tested with Jetty Hightide 7.4.2 and GlassFish 3.1.

Jetty configuration (in csh/tcsh syntax):

setenv JETTY_HOME $HOME/tools/jetty
setenv JETTY_PORT 7070 # avoid port conflict
mkdir $JETTY_HOME/lib/ext/glassfish
The following commands copy 32 GlassFish jars needed for this test to Jetty directory:
cd $GLASSFISH_HOME/modules
cp javax.ejb.jar ejb-container.jar deployment-common.jar dol.jar glassfish-corba-csiv2-idl.jar glassfish-corba-codegen.jar ssl-impl.jar security.jar ejb.security.jar management-api.jar gmbal-api-only.jar gmbal.jar glassfish-corba-asm.jar glassfish-corba-newtimer.jar glassfish-corba-orbgeneric.jar config-types.jar kernel.jar config.jar config-api.jar glassfish-corba-omgapi.jar glassfish-corba-orb.jar orb-connector.jar orb-enabler.jar orb-iiop.jar glassfish-api.jar auto-depends.jar hk2-core.jar internal-api.jar common-util.jar glassfish-corba-internal-api.jar glassfish-naming.jar bean-validator.jar $JETTY_HOME/lib/ext/glassfish
I had to slightly modify TestServlet to make it work in Jetty:

1, declare TestServlet with web.xml instead of using @javax.servlet.annotation.WebServlet, probably because servlet 3.0 support is not there yet in Jetty 7.4.2;

2, change @PostConstruct method to servlet init method. When using @PostConstruct to look up TestBean, it is not initialized and produced NullPointerException at request time. So I changed it to servlet init() method, which is a lifecycle method since early days of servlet. The complete TestServlet.java and web.xml:
package test;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.naming.*;
import javax.annotation.*;

public class TestServlet extends HttpServlet {
private static final String glassfishJndiPropertiesPath = "/glassfish-jndi.properties";
private static final String testBeanJndi = "java:global/test-ejb/TestBean";
private TestIF testBean;

private Properties getGlassFishJndiProperties() {
Properties props = new Properties();
try {
props.load(getClass().getResourceAsStream(glassfishJndiPropertiesPath));
} catch (IOException e) {
System.out.println("Failed to load " + glassfishJndiPropertiesPath);
}
System.out.println("Got glassfish-jndi.properties: " + props);
return props;
}

public void init() {
try {
InitialContext ic = new InitialContext(getGlassFishJndiProperties());
testBean = (TestIF) ic.lookup(testBeanJndi);
System.out.println("Looked up " + testBeanJndi + ", got " + testBean);
} catch (NamingException e) {
throw new RuntimeException(e);
}
}

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
out.println("testBean.hello(): " + testBean.hello());
}

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
}

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

<servlet>
<servlet-name>TestServlet</servlet-name>
<servlet-class>test.TestServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>TestServlet</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>
After packaging, test2.war (a sample app test.war is already included in jetty/webapps, so use a different name) contains the following entries:
WEB-INF/classes/glassfish-jndi.properties
WEB-INF/classes/test/TestIF.class
WEB-INF/classes/test/TestServlet.class
WEB-INF/web.xml
Other files, TestIF, TestBean, test-ejb.jar and glassfish-jndi.properties, are all the same as in Tomcat and Resin exercise.

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