我正在尝试从下而上学习OSGI。首先制作并运行minimal example bundle。
我使用apache felix网站上的maven和先前链接的示例建立了一个简单的项目。这个最小的项目似乎可以很好地编译，并且在检查生成的.jar文件的内容时看不到任何问题。
然后我使用felix:install <mybundle.jar>将生成的捆绑.jar文件安装在apache felix的gogo osgi-terminal工具中。之后，我尝试使用felix:start <mybundle.jar>启动它。
这是我的问题发生的时间。我得到了org.osgi.framework.BundleException的堆栈跟踪。
所以这是我要解决的问题。我没有发现明显的问题或解决方案，可能会帮助或解释为什么我遇到此问题。
我还使用apache felix框架版本6.0.3来运行我的捆绑软件。
所以，我的问题是：为什么会遇到这些问题，我应该怎么做才能解决这些问题，以便我可以重新开始学习OSGI？
考虑到所有技术问题，我一直在寻找伟大的互联网的无限智慧，但是找不到在相同情况下遇到相同问题的人。
有关更多信息，我使用的是Java 12和IntelliJ Idea Community Edition内置的Maven。使用Java 8进行相同的设置时，我遇到了同样的问题，并已升级到12，只是因为这样做比早晚感到明智。
OSGI-Activator类是迄今为止该项目中唯一的代码，如下所示：
package com.github.hannesknutsson.privatepkg;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceEvent;
import org.osgi.framework.ServiceListener;
public class Activator implements BundleActivator, ServiceListener {
private BundleContext context;
public void start(BundleContext bundleContext) throws Exception {
context = bundleContext;
System.out.println("Starting to listen for service events.");
context.addServiceListener(this);
}
public void stop(BundleContext bundleContext) throws Exception {
System.out.println("Stopped listening for service events.");
}
public void serviceChanged(ServiceEvent serviceEvent) {
String[] objectClass = (String[])
serviceEvent.getServiceReference().getProperty("objectClass");
if (serviceEvent.getType() == ServiceEvent.REGISTERED)
{
System.out.println(
"Ex1: Service of type " + objectClass[0] + " registered.");
}
else if (serviceEvent.getType() == ServiceEvent.UNREGISTERING)
{
System.out.println(
"Ex1: Service of type " + objectClass[0] + " unregistered.");
}
else if (serviceEvent.getType() == ServiceEvent.MODIFIED)
{
System.out.println(
"Ex1: Service of type " + objectClass[0] + " modified.");
}
}
}
用于编译结果并将其打包到捆绑的.jar文件中的Maven pom.xml如下：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>testproject</artifactId>
<groupId>com.github.hannesknutsson</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<packaging>bundle</packaging>
<artifactId>TestBundle</artifactId>
<dependencies>
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.1.1</version>
</dependency>
<dependency>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<version>4.2.0</version>
</dependency>
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
</archive>
</configuration>
<version>3.1.1</version>
</plugin>
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<extensions>true</extensions>
<configuration>
<instructions>
<Export-Package>${project.groupId}.services</Export-Package>
<Private-Package>${project.groupId}.privatepkg</Private-Package>
<Bundle-Activator>${project.groupId}.privatepkg.Activator</Bundle-Activator>
</instructions>
</configuration>
<version>4.2.0</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>12</source>
<target>12</target>
</configuration>
<version>3.8.1</version>
</plugin>
</plugins>
</build>
</project>
由此产生的堆栈跟踪如下：
org.osgi.framework.BundleException: Unable to cache bundle: TestBundle-1.0-SNAPSHOT.jar
at org.apache.felix.framework.Felix.installBundle(Felix.java:3231)
at org.apache.felix.framework.BundleContextImpl.installBundle(BundleContextImpl.java:147)
at org.apache.felix.framework.BundleContextImpl.installBundle(BundleContextImpl.java:120)
at org.apache.felix.gogo.command.Basic.start(Basic.java:734)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at org.apache.felix.gogo.runtime.Reflective.invoke(Reflective.java:139)
at org.apache.felix.gogo.runtime.CommandProxy.execute(CommandProxy.java:91)
at org.apache.felix.gogo.runtime.Closure.executeCmd(Closure.java:599)
at org.apache.felix.gogo.runtime.Closure.executeStatement(Closure.java:526)
at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:415)
at org.apache.felix.gogo.runtime.Pipe.doCall(Pipe.java:416)
at org.apache.felix.gogo.runtime.Pipe.call(Pipe.java:229)
at org.apache.felix.gogo.runtime.Pipe.call(Pipe.java:59)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:835)
Caused by: java.net.MalformedURLException: no protocol: TestBundle-1.0-SNAPSHOT.jar
at java.base/java.net.URL.<init>(URL.java:650)
at org.apache.felix.framework.util.SecureAction.createURL(SecureAction.java:256)
at org.apache.felix.framework.cache.JarRevision.initialize(JarRevision.java:148)
at org.apache.felix.framework.cache.JarRevision.<init>(JarRevision.java:76)
at org.apache.felix.framework.cache.BundleArchive.createRevisionFromLocation(BundleArchive.java:799)
at org.apache.felix.framework.cache.BundleArchive.reviseInternal(BundleArchive.java:480)
at org.apache.felix.framework.cache.BundleArchive.<init>(BundleArchive.java:148)
at org.apache.felix.framework.cache.BundleCache.create(BundleCache.java:462)
at org.apache.felix.framework.Felix.installBundle(Felix.java:3227)
... 19 more
java.net.MalformedURLException: no protocol: TestBundle-1.0-SNAPSHOT.jar
答案 0 :(得分：1)
Felix在安装捆绑软件时需要一个URI。尝试使用完整文件：URL。
或者，您可以下载felix发行版，然后将捆绑软件放入捆绑软件目录中。
通常请注意，felix教程有些过时，并且使用了一些您在生产中永远不会使用的非常低级的方法。
请参阅以下问题的答案：Where to find and install org.osgi.framework package?