[PAXEXAM-940] Enable run multiple karaf containers at once

containers/pax-exam-container-karaf/src/main/java/org/ops4j/pax/exam/karaf/container/internal/KarafTestContainer.java

@@ -38,6 +38,7 @@
 import java.rmi.RemoteException;
 import java.rmi.registry.LocateRegistry;
 import java.rmi.registry.Registry;
+import java.rmi.server.ExportException;
 import java.rmi.server.UnicastRemoteObject;
 import java.text.DateFormat;
 import java.text.SimpleDateFormat;
@@ -229,7 +230,7 @@ private int openRegistryOnFreePort(String host, int minPort, int maxPort) throws
 				LOGGER.info("Created RMI registry server on {}:{}", host, port);
 				return port;
 			} catch (RemoteException ex) {
-				if (ex.detail instanceof BindException) {
+				if (ex instanceof ExportException || ex.detail instanceof BindException) {
 					LOGGER.trace("Tried to open RMI registry on {}: {} but failed.", host, port, ex);
 					if (port >= maxPort) {
 						throw ex;

containers/pax-exam-container-karaf/src/test/java/org/ops4j/pax/exam/karaf/container/Karaf4MultipleTestContainersITest.java

@@ -0,0 +1,57 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.ops4j.pax.exam.karaf.container;
+
+import org.ops4j.pax.exam.Configuration;
+import org.ops4j.pax.exam.Option;
+import org.ops4j.pax.exam.karaf.options.LogLevelOption;
+import org.ops4j.pax.exam.options.MavenArtifactUrlReference;
+import org.ops4j.pax.exam.spi.reactors.ExamReactorStrategy;
+import org.ops4j.pax.exam.spi.reactors.PerClass;
+
+import java.io.File;
+
+import static org.ops4j.pax.exam.CoreOptions.maven;
+import static org.ops4j.pax.exam.karaf.options.KarafDistributionOption.configureConsole;
+import static org.ops4j.pax.exam.karaf.options.KarafDistributionOption.karafDistributionConfiguration;
+import static org.ops4j.pax.exam.karaf.options.KarafDistributionOption.logLevel;
+
+@ExamReactorStrategy(PerClass.class)
+public class Karaf4MultipleTestContainersITest extends Karaf4TestContainerITest {
+
+    private final MavenArtifactUrlReference KARAF_URL = maven("org.apache.karaf", "apache-karaf").type("zip");
+
+    @Configuration
+    public Option[] config() {
+        String karafVersion = karafVersion();
+        return new Option[] {
+            karafDistributionConfiguration()
+                .frameworkUrl(KARAF_URL.version(karafVersion))
+                .karafVersion(karafVersion)
+                .useDeployFolder(false)
+                .unpackDirectory(new File("target/paxexam/unpack/")),
+            karafDistributionConfiguration()
+                .frameworkUrl(KARAF_URL.version(karafVersion))
+                .karafVersion(karafVersion)
+                .useDeployFolder(false)
+                .unpackDirectory(new File("target/paxexam/unpack/second/")),
+            configureConsole().startLocalConsole().ignoreRemoteShell(),
+            logLevel(LogLevelOption.LogLevel.INFO)
+        };
+    }
+}