Setting up context java:comp/env in Jetty running inside GWT 2.7

Question

Contents of jetty-web.xml in /WEB-INF:

<Configure class="org.eclipse.jetty.webapp.WebAppContext">  
  <Array id="plusConfig" type="java.lang.String">
    <Item>org.eclipse.jetty.webapp.WebInfConfiguration</Item>
    <Item>org.eclipse.jetty.webapp.WebXmlConfiguration</Item>
    <Item>org.eclipse.jetty.webapp.MetaInfConfiguration</Item>
    <Item>org.eclipse.jetty.webapp.FragmentConfiguration</Item>
    <Item>org.eclipse.jetty.plus.webapp.EnvConfiguration</Item> <!-- add for jndi -->
    <Item>org.eclipse.jetty.plus.webapp.PlusConfiguration</Item>    <!-- add for jndi -->
    <Item>org.eclipse.jetty.webapp.JettyWebXmlConfiguration</Item>
  </Array>
  <Call class="java.lang.System" name="setProperty">
    <Arg>java.naming.factory.initial</Arg>
    <Arg><Property name="java.naming.factory.initial" default="org.eclipse.jetty.jndi.InitialContextFactory"/></Arg>
  </Call>
  <Call class="java.lang.System" name="setProperty">
    <Arg>java.naming.factory.url.pkgs</Arg>
    <Arg><Property name="java.naming.factory.url.pkgs" default="org.eclipse.jetty.jndi"/></Arg>
  </Call> 
</Configure>

Contents of jetty-plus.xml in /WEB-INF:

<Configure id="Server" class="org.eclipse.jetty.server.Server">
<!-- =========================================================== -->
<!-- Add plus Configuring classes to all webapps for this Server -->
<!-- =========================================================== -->
  <Call class="org.eclipse.jetty.webapp.Configuration$ClassList" name="setServerDefault">
    <Arg><Ref refid="Server" /></Arg>
    <Call name="addAfter">
      <Arg name="afterClass">org.eclipse.jetty.webapp.FragmentConfiguration</Arg>
      <Arg>
        <Array type="String">
        <Item>org.eclipse.jetty.plus.webapp.EnvConfiguration</Item>
        <Item>org.eclipse.jetty.plus.webapp.PlusConfiguration</Item>
      </Array>
    </Arg>
  </Call>
</Call>
</Configure>

This is my calling code in Servlet's init() method:

Context _initCtx = new InitialContext();
Context _envCtx  = (Context) _initCtx.lookup("java:comp/env");

Error it throws:

javax.naming.NameNotFoundException; remaining name 'env'
at org.eclipse.jetty.jndi.NamingContext.lookup(NamingContext.java:449)
at org.eclipse.jetty.jndi.NamingContext.lookup(NamingContext.java:536)
at org.eclipse.jetty.jndi.NamingContext.lookup(NamingContext.java:551)
at org.eclipse.jetty.jndi.java.javaRootURLContext.lookup(javaRootURLContext.java:117)
at javax.naming.InitialContext.lookup(Unknown Source)

I'm running vanilla GWT 2.7 and I'm trying to use JNDI lookup in my server code. I have also attached jetty-all-8.1.9.v20130131.jar and jetty-plus-8.1.9.v20130131.jar to the project since some of Context and JNDI classes are missing in GWT jars. I tried to verify the version of jetty in GWT, and I got this:

Server server = new Server(7070);
System.out.println(server.getVersion());

8.y.z-SNAPSHOT

I saw solution where you can configure JNDI other ways, however since I'm running in GWT, I can only work with the jetty-web.xml and jetty-plus.xml files.

When debugging the servlet, I'm getting context for:

Context _envCtx  = (Context) _initCtx.lookup("java:comp");

But not for:

Context _envCtx  = (Context) _initCtx.lookup("java:comp/env");

Stacktrace is above.

I'm really stuck here. Any jetty gurus out there?

---

Edit 1:

Added jetty-env.xml :

<?xml version="1.0"?>
<!DOCTYPE Configure PUBLIC "-//Mort Bay Consulting//DTD Configure//EN" "http://www.eclipse.org/jetty/configure_9_0.dtd">
<Configure id='portal' class="org.eclipse.jetty.webapp.WebAppContext">
  <New id="DStest" class="org.eclipse.jetty.plus.jndi.Resource">
  <Arg></Arg>
  <Arg>jdbc/DSTest</Arg>
  <Arg>
    <New class="org.hsqldb.jdbcDriver">
      <Set name="Url">jdbc:hsqldb:hsql://localhost</Set>
      <Set name="User">sa</Set>
      <Set name="Password"></Set>
    </New>
  </Arg>
</New>
</Configure>

And this to my web.xml:

<resource-ref>
  <description>Primary database</description>
  <res-ref-name>jdbc/DSTest</res-ref-name>
  <res-type>javax.sql.DataSource</res-type>
  <res-auth>Container</res-auth>
</resource-ref>

Still _envCtx is null with the exception below. _initCtx.lookup("java:comp") does return org.eclipse.jetty.jndi.NamingContext instance.

Context           _initCtx          = new InitialContext();
Context           _envCtx           = (Context) _initCtx.lookup("java:comp/env");

results in

javax.naming.NameNotFoundException; remaining name 'env'

---

Edit 2:

I must be missing something else (basic)....??!? I changed that 1 line in jetty-env.xml to:

<Arg><Ref refid="portal"/>jdbc/DSTest</Arg>

And the doctype:

<!DOCTYPE Configure PUBLIC "-//Mort Bay Consulting//DTD Configure//EN" "http://www.eclipse.org/jetty/configure.dtd">

I could not find more appropriate .dtd for v8.X Still same problem.

Answer 1

What's working for me (assuming you're not using SuperDevMode):

1. Add -Djava.naming.factory.initial=org.eclipse.jetty.jndi.InitialContextFactory to the JVM parameters when you run DevMode. (in extraJvmArgs for gwt-maven-plugin)

2. Add dependencies for Jetty Plus and JNDI to your POM:

   <dependency>
       <groupId>org.eclipse.jetty</groupId>
       <artifactId>jetty-jndi</artifactId>
       <version>8.1.12.v20130726</version>
       <scope>provided</scope>
   </dependency>
   <dependency>
       <groupId>org.eclipse.jetty</groupId>
       <artifactId>jetty-plus</artifactId>
       <version>8.1.12.v20130726</version>
       <scope>provided</scope>
   </dependency>
   

3. Have the JNDI entries configured in jetty-web.xml:

   <?xml version="1.0"?>
   <Configure class="org.eclipse.jetty.webapp.WebAppContext">
   
       <New id="DataSource" class="org.eclipse.jetty.plus.jndi.Resource">
           <Arg>jdbc/XYZ</Arg>
           <Arg>
               <New class="org.postgresql.ds.PGSimpleDataSource">
                   <Set name="user">X</Set>
                   <Set name="password">Y</Set>
                   <Set name="databaseName">Z</Set>
                   <Set name="serverName">X</Set>
                   <Set name="portNumber">A</Set>
               </New>
           </Arg>
       </New>
   
       <New class="org.eclipse.jetty.plus.jndi.EnvEntry">
           <Arg>config/ABC</Arg>
           <Arg type="java.lang.String">Value</Arg>
       </New>
       <!-- ... -->
   </Configure>
   

That's it.