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我必须将 Eclipse/Equinox OSGi 框架嵌入到现有应用程序中。

我找到了本教程http://njbartlett.name/2011/03/07/embedding-osgi.html并尝试使用 FRAMEWORK_SYSTEMPACKAGES_EXTRA 常量。

所以我尝试通过系统包将一个简单的java类导出到正在运行的框架中，但是我从我的激活器包中收到以下错误

    Exception in thread "main" org.osgi.framework.BundleException: The activator com.bundleactivator.Activator for bundle com.bundleactivator is invalid
at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:156)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:751)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:370)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:284)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:276)
at RunNewEquinoxOsgi.main(RunNewEquinoxOsgi.java:74)
    Caused by: java.lang.Error: Unresolved compilation problem: 
The import example cannot be resolved

at com.bundleactivator.Activator.<init>(Activator.java:8)
at java.lang.J9VMInternals.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1505)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:151)
... 5 more

在我从激活器的系统包中导入 example.osgi 包的地方引发异常

    import example.osgi.Example;

我在其他 java 类中通过 FrameworkFactory 启动 Equinox

    import java.util.HashMap;
    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.Constants;
    import org.osgi.framework.ServiceReference;
    import org.osgi.framework.launch.Framework;
    import org.osgi.framework.launch.FrameworkFactory;
    import example.osgi.*;

    FrameworkFactory frameworkFactory = ServiceLoader.load(FrameworkFactory.class).iterator().next();
    Map<String, String> config = new HashMap<String, String>();
    config.put(Constants.FRAMEWORK_SYSTEMPACKAGES_EXTRA,
    "example.osgi;version=\"1.0.0\"");
    try {
        framework.start();
        System.out.println("Framework start");
    } catch (BundleException e) {
        e.printStackTrace();
    }

    BundleContext ctx = framework.getBundleContext();

    Bundle b3 = ctx.installBundle("file:C:\\equinoxtest\\ds.jar");
    System.out.println(b3.getBundleId() + " installed");
    Bundle b4 = ctx.installBundle("file:C:\\equinoxtest\\services.jar");
    System.out.println(b4.getBundleId() + " installed");
    Bundle b5 = ctx.installBundle("file:C:\\equinoxtest\\util.jar");
    System.out.println(b5.getBundleId() + " installed");
    Bundle b6 = ctx.installBundle("file:C:\\equinoxtest\\service.jar");
    System.out.println(b6.getBundleId() + " installed");
    Bundle b7 = ctx.installBundle("file:C:\\equinoxtest\\rule1.jar");
    System.out.println(b7.getBundleId() + " installed");
    Bundle b8 = ctx.installBundle("file:C:\\equinoxtest\\rule2.jar");
    System.out.println(b8.getBundleId() + " installed");
    Bundle b9 = ctx.installBundle("file:C:\\equinoxtest\\rule3.jar");
    System.out.println(b9.getBundleId() + " installed");
    Bundle b10 = ctx.installBundle("file:C:\\equinoxtest\\activator.jar");
    System.out.println(b10.getBundleId() + " installed");

    b3.start();
    b4.start();
    b5.start();
    b6.start();
    b7.start();
    b8.start();
    b9.start();
    b10.start(); // here i start the activator

这是激活器类的清单

    Manifest-Version: 1.0
    Bundle-ManifestVersion: 2
    Bundle-Name: BundleActivator
    Bundle-SymbolicName: com.bundleactivator
    Bundle-Version: 1.0.0.qualifier
    Bundle-Activator: com.bundleactivator.Activator
    Bundle-RequiredExecutionEnvironment: JavaSE-1.6
    Import-Package: com.bundleservice,
     example.osgi;version="1.0.0";resolution:=optional,
     org.osgi.framework;version="1.3.0",
     org.osgi.util.tracker;version="1.4.0"
    Bundle-ActivationPolicy: lazy
    Export-Package: com.bundleactivator

在 OSGi 控制台中，我在系统包导出中看到了这个包（example.osgi），但导入类（激活器）抛出异常。我还应该做什么？

    >osgi packages 0
    ...
    example.osgi; version="1.0.0"<org.eclipse.osgi_3.6.2.R36x_v20110210 [0]>
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1 回答 1

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这个错误：

 java.lang.Error: Unresolved compilation problem

表示您正在使用 Eclipse 构建代码，但存在编译错误。您需要在运行代码之前编译代码。

背景信息：Eclipse 不使用该javac命令进行编译，它有一个内置的 Java 编译器，称为 ECJ。此编译器专为在 IDE 内增量使用而设计，即使出现错误，它也会尽最大努力继续运行。所以它仍然会产生一个有效的 .class 文件，但是如果你真的尝试运行一些接触到错误的类的东西，那么你会得到上面的运行时错误。相反，javac当它遇到编译错误时会简单地停止，并且不会生成可以运行的 .class 文件。

于 2013-09-18T19:03:18.867 回答