为什么我的OSGI示例无法在捆绑包开始时打印“Hello World”？

Question

把一个例子从尼尔·巴特利特OSGi的书”

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.
    }
}

^我把它放在一个文件叫做HelloUpdaterActivator。

我成功地编译java文件教程智慧

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

然后我把所有生成的类文件

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

最后,我做了一个通用的样品清单。MF文件

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已经准备好了，我在终端中打开了OSGi，它有自己的小控制台，就像这样:

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

OSGi 控制台如下所示：

osgi> 

我在OSGi控制台中输入：

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]

但是即使它说我创建的jar文件是活动的,“Hello World”永远不会在开始时打印,“Goodbye World”永远不会在停止时打印。为什么我的OSGi教程不会在包开始时打印“Hello World”或在包停止时打印“Goodbye world ”?

更新

我明白了通过改变我的工作清单。MF文件t

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

您缺少了一个＜code＞Bundle Activator＜/code＞头，因此它知道如何调用该类的方法。