My environment reliably gets this error in the new GFv3 Embedded integration test for ARQ:

java.io.FileNotFoundException: http://localhost:8080/test/Test
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1303)
    at java.net.URL.openStream(URL.java:1009)
    at org.jboss.arquillian.glassfish.GlassFishEmbeddedContainerTestCase.shouldBeAbleToDeployWebArchive(GlassFishEmbeddedContainerTestCase.java:68)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
    at org.jboss.arquillian.junit.Arquillian$6$1.invoke(Arquillian.java:202)
    at org.jboss.arquillian.impl.handler.ActivateRunModeTypeLocal$LocalMethodExecutor.invoke(ActivateRunModeTypeLocal.java:59)
    at org.jboss.arquillian.impl.handler.ContainerTestExecuter.callback(ContainerTestExecuter.java:50)
    at org.jboss.arquillian.impl.handler.ContainerTestExecuter.callback(ContainerTestExecuter.java:40)
    at org.jboss.arquillian.impl.event.MapEventManager.fire(MapEventManager.java:63)
    at org.jboss.arquillian.impl.context.AbstractEventContext.fire(AbstractEventContext.java:115)
    at org.jboss.arquillian.impl.EventTestRunnerAdaptor.test(EventTestRunnerAdaptor.java:117)
    at org.jboss.arquillian.junit.Arquillian$6.evaluate(Arquillian.java:197)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
    at org.jboss.arquillian.junit.Arquillian$4.evaluate(Arquillian.java:169)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
    at org.jboss.arquillian.junit.Arquillian$5.evaluate(Arquillian.java:183)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:44)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:180)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:41)
    at org.junit.runners.ParentRunner$1.evaluate(ParentRunner.java:173)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
    at org.jboss.arquillian.junit.Arquillian$2.evaluate(Arquillian.java:139)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
    at org.jboss.arquillian.junit.Arquillian$3.evaluate(Arquillian.java:153)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:220)
    at org.jboss.arquillian.junit.Arquillian.run(Arquillian.java:105)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

This isn't present in my Hudson environment.

The output shows the application getting loaded, so I don't know what's up.  The test fails and it also 404s from a browser.

May 9, 2010 3:50:22 PM com.sun.enterprise.web.WebApplication start
INFO: Loading application test at /test

BTW straight URL connections to a servlet are more brittle than using Apache's HttpClient for example.  That's not the root of the error in this case (I verified manually).

Additionally, I think we can make the test more integration-centric if it uses the ARQ annotations etc:

[alr@localhost trunk]$ svn di containers/glassfish-embedded-30/
Index: containers/glassfish-embedded-30/src/test/java/org/jboss/arquillian/glassfish/GlassFishEmbeddedContainerTestCase.java
===================================================================
--- containers/glassfish-embedded-30/src/test/java/org/jboss/arquillian/glassfish/GlassFishEmbeddedContainerTestCase.java    (revision 4375)
+++ containers/glassfish-embedded-30/src/test/java/org/jboss/arquillian/glassfish/GlassFishEmbeddedContainerTestCase.java    (working copy)
@@ -19,50 +19,49 @@
 import java.io.ByteArrayOutputStream;
 import java.io.InputStream;
 import java.net.URL;
+import java.util.logging.Logger;
 
-import org.jboss.arquillian.impl.DynamicServiceLoader;
-import org.jboss.arquillian.impl.XmlConfigurationBuilder;
-import org.jboss.arquillian.impl.context.SuiteContext;
-import org.jboss.arquillian.spi.Context;
-import org.jboss.arquillian.spi.DeployableContainer;
+import org.jboss.arquillian.api.Deployment;
+import org.jboss.arquillian.api.RunMode;
+import org.jboss.arquillian.api.RunModeType;
+import org.jboss.arquillian.junit.Arquillian;
 import org.jboss.shrinkwrap.api.ShrinkWrap;
 import org.jboss.shrinkwrap.api.spec.WebArchive;
-import org.junit.After;
 import org.junit.Assert;
-import org.junit.Before;
 import org.junit.Test;
+import org.junit.runner.RunWith;
 
+
 /**
  * GlassFishEmbeddedContainerTestCase
  *
  * @author <a href="mailto:aslak@redhat.com">Aslak Knutsen</a>
  * @version $Revision: $
  */
+@RunWith(Arquillian.class)
+@RunMode(RunModeType.LOCAL)
 public class GlassFishEmbeddedContainerTestCase 
 {
-   private DeployableContainer container;
-   
-   private Context context = new SuiteContext(new DynamicServiceLoader());
-   
-   private WebArchive war = ShrinkWrap.create("test.war", WebArchive.class)
-                              .addClass(TestServlet.class);
 
-   @Before
-   public void startup() throws Exception
+   /**
+    * Logger
+    */
+   private static final Logger log = Logger.getLogger(GlassFishEmbeddedContainerTestCase.class.getName());
+   
+   /**
+    * Deployment for the test
+    * @return
+    */
+   @Deployment
+   public static WebArchive getDeployment()
    {
-      container = new GlassFishEmbeddedContainer();
-      container.setup(context, new XmlConfigurationBuilder().build());
-      container.start(context);
-      container.deploy(context, war);
-   }
+      final WebArchive war = ShrinkWrap.create("test.war", WebArchive.class).addClass(TestServlet.class);
+      log.info(war.toString(true));
+      return war;
 
-   @After
-   public void shutdown() throws Exception
-   {
-      container.undeploy(context, war);
-      container.stop(context);
    }
 
+
    @Test
    public void shouldBeAbleToDeployWebArchive() throws Exception
    {
Index: containers/glassfish-embedded-30/pom.xml
===================================================================
--- containers/glassfish-embedded-30/pom.xml    (revision 4375)
+++ containers/glassfish-embedded-30/pom.xml    (working copy)
@@ -97,6 +97,13 @@
          <version>${project.version}</version>
          <scope>test</scope>
       </dependency>
+      
+      <dependency>
+        <groupId>org.jboss.arquillian</groupId>
+        <artifactId>arquillian-junit</artifactId>
+        <version>${project.version}</version>
+        <scope>test</scope>
+      </dependency>
 
       <dependency>
          <groupId>junit</groupId>