Question

以Neil Bartlett的书“OSGi in Practice”为例，我复制了以下代码，它可以启动，停止和检查目录中的bundle，并且应该在bundle start和stop上打印消息：

package tutorial;
import java.io.File;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleException;

public class HelloUpdaterActivator implements BundleActivator {
// ...
private final Thread thread = new Thread(new BundleUpdater());
private volatile BundleContext context;

@Override
public void start(BundleContext context) throws Exception {
    System.out.println("Hello World");
    this.context = context;
    thread.start();
}

@Override
public void stop(BundleContext context) throws Exception {
    System.out.println("Goodbye World");
    thread.interrupt();
}

protected Bundle findBundleByLocation(String location) {
    // ... Not relevant to lack of any print statements in OSGi console.
}

private class BundleUpdater implements Runnable {
    @Override
    public void run() {
        // ... Not relevant to lack of any print statements in OSGi console.
    }
}

^我把它放在一个名为HelloUpdaterActivator.java的文件中，并将该java文件放在一个名为“tutorial”的文件夹中，同时放入org.eclipse.osgi_3.5.1.R35x_v20090827.jar（OSGi的jar文件随旧版一起提供） OSGi的Eclipse Equinox实现版本）。

我用：

成功编译了教程java文件

javac -cp ".:org.eclipse.osgi_3.5.1.R35x_v20090827.jar" HelloUpdaterActivator.java

然后我获取了生成的所有类文件并将它们放入一个类似的jar中：

jar cf HelloUpdaterActivator.jar ./HelloUpdaterActivator.class ./HelloUpdaterActivator\$BundleUpdater.class ./HelloUpdaterActivator\$1.class

最后，我为jar创建了一个通用样本MANIFEST.MF文件，如下所示：

Manifest-Version: 1.0
Created-By: 1.7.0_79 (Oracle Corporation)
Bundle−Name: OSGi Bundle
Bundle−Symbolic Name: example1
Bundle−Version: 1.0.1
Bundle−Required Execution Environment: J2SE−1.6

现在jar已经准备就绪，我在终端中打开了OSGi，它有自己的小控制台，如下所示：

java -jar ./org.esgi_3.5.1.R35x_v20090827.jar -console -configuration runtime

OSGi控制台看起来像这样：

osgi>

我输入OSGi控制台：

osgi> install file:HelloUpdaterActivator.jar
Bundle id is 1
osgi> ss

Framework is launched.

id  State       Bundle
0   ACTIVE      org.eclipse.osgi_3.5.1.R35x_v20090827
1   INSTALLED   unknown_0.0.0 [1]

osgi> start 1
osgi> ss

Framework is launched.

id  State       Bundle
0   ACTIVE      org.eclipse.osgi_3.5.1.R35x_v20090827
1   ACTIVE      unknown_0.0.0 [1]

osgi> stop 1

osgi> ss

Framework is launched.

id  State       Bundle
0   ACTIVE      org.eclipse.osgi_3.5.1.R35x_v20090827
1   RESOLVED    unknown_0.0.0 [1]

但即使它说我制作的jar文件是活动的，“Hello World”永远不会在开始时打印，而“Goodbye World”永远不会打印停止。为什么我的OSGi教程不会在捆绑启动时打印“Hello World”或在捆绑停止时打印“Goodbye world”？

更新

我通过将MANIFEST.MF文件更改为：

来实现它

Manifest-Version: 1.0  
Bundle-ManifestVersion: 2
Bundle-Name: OSGi_Bundle - Activator  
Bundle-Version: 1.0.0.SNAPSHOT
Bundle-Activator: Activator  
Bundle-ClassPath: .
Bundle-Description: Activator
Bundle-SymbolicName: activator
Import-Package: org.osgi.framework

Answer 1

您缺少Bundle-Activator标头，因此它知道调用您的类'方法。

为什么我的OSGI示例不会在bundle start上打印“Hello World”？

1 个答案: