我正在玩Felix，但我听不懂一件事。
我有一些OSGi Felix软件包，我尝试从该软件包中加载和使用服务。
捆绑代码：
package ihtika2.i_testbundle;
import ihtika2.i_testbundle.service.TestClasssInter;
import java.util.Hashtable;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServiceReference;
public class Activator implements BundleActivator {
@Override
public void start(BundleContext context) throws Exception {
Hashtable<String, String> props = new Hashtable<String, String>();
props.put("Funct", "TESTCl");
context.registerService(TestClasssInter.class.getName(), new TestClasss(), props);
ServiceReference[] refs;
try {
BundleContext bundleContext = context;
// System.out.println(TestClasssInter.class.getName());
refs = bundleContext.getServiceReferences("ihtika2.i_testbundle.service.TestClasssInter", "(Funct=TESTCl)");
if (refs == null) {
System.out.println("Not Found AboutForm on show!!!");
} else {
Object MainForm = bundleContext.getService(refs[0]);
TestClasssInter sdfsdf = (TestClasssInter) MainForm;
sdfsdf.printSomeLine();
// MainForm.sendContext(bundleContext);
// MainForm.showWindow();
}
} catch (InvalidSyntaxException ex) {
ex.printStackTrace();
}
}
@Override
public void stop(BundleContext context) throws Exception {
// TODO add deactivation code here
}
}
package ihtika2.i_testbundle;
import ihtika2.i_testbundle.service.TestClasssInter;
/**
*
* @author Arthur
*/
public class TestClasss implements TestClasssInter {
@Override
public void printSomeLine() {
System.out.println("TEST MESSAGE");
}
}
package ihtika2.i_testbundle.service;
/**
*
* @author Arthur
*/
public interface TestClasssInter {
public void printSomeLine();
}
正如您在更新的示例中看到的那样-必须显示捆绑代码中的“ TEST MESSAGE”行。显示，一切正常。
但是，如果我尝试在“加载程序”中执行此代码，则将显示错误
Could not create framework: java.lang.ClassCastException: ihtika2.i_testbundle.TestClasss cannot be cast to ihtika2.i_testbundle.service.TestClasssInter
java.lang.ClassCastException: ihtika2.i_testbundle.TestClasss cannot be cast to ihtika2.i_testbundle.service.TestClasssInter
at com.google.code.ihtika.Starter.main(Starter.java:103)
Java Result: -1
加载程序的代码是
/*
* 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 com.google.code.ihtika;
import ihtika2.i_testbundle.service.TestClasssInter;
import java.io.File;
import java.util.ArrayList;
import java.util.Map;
import java.util.ServiceLoader;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleException;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.launch.Framework;
import org.osgi.framework.launch.FrameworkFactory;
/**
* This class provides a static {@code main()} method so that the bundle can be
* run as a stand-alone host application. In such a scenario, the application
* creates its own embedded OSGi framework instance and interacts with the
* internal extensions to providing drawing functionality. To successfully
* launch the stand-alone application, it must be run from this bundle's
* installation directory using "{@code java -jar}". The locations of any
* additional extensions that have to be started, have to be passed as command
* line arguments to this method.
*/
public class Starter {
private static Framework m_framework = null;
/**
* Enables the bundle to run as a stand-alone application. When this static
* {@code main()} method is invoked, the application creates its own
* embedded OSGi framework instance and interacts with the internal
* extensions to provide drawing functionality. To successfully launch as a
* stand-alone application, this method should be invoked from the bundle's
* installation directory using "{@code java -jar}". The location of any
* extension that shall be installed can be passed as parameters. <p> For
* example if you build the bundles inside your workspace, maven will create
* a target directory in every project. To start the application from within
* your IDE you should pass: <p>
* <pre>
* {@code file:../servicebased.circle/target/servicebased.circle-1.0.0.jar
* file:../servicebased.square/target/servicebased.square-1.0.0.jar
* file:../servicebased.triangle/target/servicebased.triangle-1.0.0.jar}
* </pre>
*
* @param args The locations of additional bundles to start.
*
*/
public static void main(String[] args) {
// Args should never be null if the application is run from the command line.
// Check it anyway.
ArrayList<String> locations = new ArrayList<>();
indexBundlesDir("I_Bundles/Stage_300", locations);
indexBundlesDir("I_Bundles/Stage_400", locations);
indexBundlesDir("I_Bundles/Stage_500", locations);
// Print welcome banner.
System.out.println("\nWelcome to My Launcher");
System.out.println("======================\n");
try {
Map<String, String> config = ConfigUtil.createConfig();
m_framework = createFramework(config);
m_framework.init();
m_framework.start();
installAndStartBundles(locations);
for (Bundle testBundle : m_framework.getBundleContext().getBundles()) {
if (testBundle.getSymbolicName().equals("ihtika2.I_TestBundle")) {
System.out.println("found");
ServiceReference[] refs;
try {
BundleContext bundleContext = m_framework.getBundleContext();
// System.out.println(TestClasssInter.class.getName());
refs = bundleContext.getServiceReferences("ihtika2.i_testbundle.service.TestClasssInter", "(Funct=TESTCl)");
if (refs == null) {
System.out.println("Not Found AboutForm on show!!!");
} else {
Object MainForm = bundleContext.getService(refs[0]);
TestClasssInter sdfsdf = (TestClasssInter) MainForm;
// MainForm.sendContext(bundleContext);
// MainForm.showWindow();
}
} catch (InvalidSyntaxException ex) {
ex.printStackTrace();
}
}
// Dictionary<String, String> headerLine = testBundle.getHeaders();
// Enumeration e = headerLine.keys();
//
// while (e.hasMoreElements()) {
// Object key = e.nextElement();
// if (key.equals("Import-Package")) {
// System.out.println(key + " - " + headerLine.get(key));
// }
// System.out.println(key + " - " + headerLine.get(key));
// }
}
m_framework.waitForStop(0);
System.exit(0);
} catch (Exception ex) {
System.err.println("Could not create framework: " + ex);
ex.printStackTrace();
System.exit(-1);
}
}
private static void indexBundlesDir(String bundlesDir, ArrayList<String> locations) {
File dir = new File(bundlesDir);
String[] children = dir.list();
if (children == null) {
// Either dir does not exist or is not a directory
} else {
for (int i = 0; i < children.length; i++) {
// Get filename of file or directory
locations.add("file:/c:/Art/Dropbox/OpenSource/MyGIT/ihtika-2/ihtika-2/MainApplication/" + bundlesDir + "/" + children[i]);
}
}
}
/**
* Util method for creating an embedded Framework. Tries to create a
* {@link FrameworkFactory} which is then be used to create the framework.
*
* @param config the configuration to create the framework with
* @return a Framework with the given configuration
*/
private static Framework createFramework(Map<String, String> config) {
ServiceLoader<FrameworkFactory> factoryLoader = ServiceLoader.load(FrameworkFactory.class);
for (FrameworkFactory factory : factoryLoader) {
return factory.newFramework(config);
}
throw new IllegalStateException("Unable to load FrameworkFactory service.");
}
/**
* Installs and starts all bundles used by the application. Therefore the
* host bundle will be started. The locations of extensions for the host
* bundle can be passed in as parameters.
*
* @param bundleLocations the locations where extension for the host bundle
* are located. Must not be {@code null}!
* @throws BundleException if something went wrong while installing or
* starting the bundles.
*/
private static void installAndStartBundles(ArrayList<String> bundleLocations) throws BundleException {
BundleContext bundleContext = m_framework.getBundleContext();
// Activator bundleActivator = new Activator();
// bundleActivator.start(bundleContext);
for (String location : bundleLocations) {
Bundle addition = bundleContext.installBundle(location);
// System.out.println(location);
addition.start();
}
}
}
package ihtika2.i_testbundle.service;
/**
*
* @author Arthur
*/
public interface TestClasssInter {
public void printSomeLine();
}
最佳答案
ClassLoader只是不能那样工作，它实际上需要是相同的类/接口。 MainForm实现MainFormInterface，而不是MainFormInterface2，即使它们相同。
您需要做的是：
确保您的MainFormInterface位于单独的程序包中（我认为它是：ihtika2.mainform.service）
删除MainFormInterface2
将所有MainFormInterface2引用替换为MainFormInterface
将包添加到Felix中的org.osgi.framework.system.packages.extra设置中，我认为最简单的方法是将其添加到ConfigUtil.createConfig（）之后的Map中，这样Felix可以访问ihtika2来自OSGi外部的.mainform.service软件包
确保您的捆绑包导入了软件包ihtika2.mainform.service，因此您的捆绑包也可以访问ihtika2.mainform.service
那应该做。