OSGi 中的 NoClassDefFoundError 尽管它是导出和导入的
NoClassDefFoundError in OSGi although it is exported and imported
我尝试创建一个基于 Karaf 的基本虚拟现实 IDE。
我有 3 个 maven 项目：
- 连接到本地组件进行渲染的 VRServer。
- VR-HMI-Widgets 的 VR 组件工具包（具有从 VRComponent 扩展的 VRFrame）作为多模块 Maven 项目。
- VR IDE 项目 read/write 文件并执行低级命令。
我将它们全部安装到 Karaf 中：
karaf@root()> bundle:list
START LEVEL 100 , List Threshold: 50
ID | State | Lvl | Version | Name
----+--------+-----+--------------------+---------------------------------------------------------------------------
31 | Active | 80 | 4.3.0 | Apache Karaf :: OSGi Services :: Event
54 | Active | 80 | 1.3.2 | Apache Aries SPI Fly Dynamic Weaving Bundle
55 | Active | 80 | 9.0.0 | org.objectweb.asm
56 | Active | 80 | 9.0.0 | org.objectweb.asm.commons
57 | Active | 80 | 9.0.0 | org.objectweb.asm.tree
58 | Active | 80 | 9.0.0 | org.objectweb.asm.tree.analysis
59 | Active | 80 | 9.0.0 | org.objectweb.asm.util
60 | Active | 80 | 2.0.17 | OpenWebBeans Core
61 | Active | 80 | 2.0.17 | SPI definition
62 | Active | 80 | 1.1.3 | Apache Aries CDI - CDI Component Runtime (CCR)
63 | Active | 80 | 1.1.3 | Apache Aries CDI - SPI classes for Portable Extensions
64 | Active | 80 | 1.1.3 | Apache Aries CDI - Container using Apache OpenWebBeans
65 | Active | 80 | 1.1.3 | Apache Aries CDI - SPI
66 | Active | 80 | 1.0.12 | Apache Felix Converter
67 | Active | 80 | 1.2.0 | Apache Geronimo JSR-330 Spec 1.0
68 | Active | 80 | 1.1.0 | Apache Geronimo Expression Language Spec 2.2
69 | Active | 80 | 1.2.0 | Apache Geronimo Interceptor Spec 1.2
70 | Active | 80 | 1.2.0 | Apache Geronimo JCDI Spec 2.0
71 | Active | 80 | 1.3.0.3 | Apache ServiceMix :: Specs :: Annotation API 1.3
72 | Active | 80 | 4.17.0 | Apache XBean :: ASM shaded (repackaged)
73 | Active | 80 | 4.17.0 | Apache XBean OSGI Bundle Utilities
74 | Active | 80 | 4.17.0 | Apache XBean :: Finder shaded (repackaged)
75 | Active | 80 | 1.0.1.201505202024 | org.osgi:org.osgi.namespace.extender
76 | Active | 80 | 1.0.0.201505202024 | org.osgi:org.osgi.namespace.implementation
77 | Active | 80 | 1.0.0.201505202024 | org.osgi:org.osgi.namespace.service
78 | Active | 80 | 1.0.0.201810101357 | org.osgi:org.osgi.service.cdi
79 | Active | 80 | 1.1.0.201802012106 | org.osgi:org.osgi.util.function
80 | Active | 80 | 1.1.0.201802012106 | org.osgi:org.osgi.util.promise
81 | Active | 80 | 4.3.1.SNAPSHOT | Apache Karaf :: OSGi Services :: Event
134 | Active | 80 | 1.0.0 | Virtual reality server
135 | Active | 80 | 0.0.1.SNAPSHOT | VRComponent
136 | Active | 80 | 0.0.1.SNAPSHOT | VRFrame
142 | Active | 80 | 0.0.1.SNAPSHOT | Virtual reality integrated development environment (VRIDE)
karaf@root()>
但是当我尝试启动 VRIDE 包时，出现了这个异常：
10:00:42.193 WARN [fileinstall-C:\Program Files\apache-karaf-4.3.0/deploy] Error while creating extension
java.lang.NoClassDefFoundError: Lde/e_nexus/vr/tk/VRFrame;
at java.lang.Class.getDeclaredFields0(Native Method) ~[?:1.8.0_232]
at java.lang.Class.privateGetDeclaredFields(Class.java:2611) ~[?:1.8.0_232]
at java.lang.Class.getDeclaredFields(Class.java:1944) ~[?:1.8.0_232]
at org.apache.aries.cdi.container.internal.util.Reflection.allFields(Reflection.java:47) ~[!/:1.1.3]
at org.apache.aries.cdi.container.internal.annotated.AnnotatedTypeImpl.<init>(AnnotatedTypeImpl.java:42) ~[!/:1.1.3]
at org.apache.aries.cdi.container.internal.container.Discovery.lambda$discover(Discovery.java:133) ~[!/:1.1.3]
at java.util.HashMap$Values.forEach(HashMap.java:981) ~[?:1.8.0_232]
这是我尝试加载的 Java-Class：
package de.e_nexus.desktop.vr.ide;
import java.util.logging.Logger;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;
import org.osgi.service.cdi.annotations.Reference;
import org.osgi.service.cdi.annotations.Service;
import de.e_nexus.vr.server.ClientKeyboardScancode;
import de.e_nexus.vr.server.VRClientHelmetAndControllerListener;
import de.e_nexus.vr.server.VRClientKeyboardListener;
import de.e_nexus.vr.server.VRServer;
import de.e_nexus.vr.server.listeners.VRClientRequestAppInfo;
import de.e_nexus.vr.server.listeners.VRClientStatusListener;
import de.e_nexus.vr.server.listeners.interaction.HelmetAndControllerInfo;
import de.e_nexus.vr.server.osgi.inter.VRServerService;
import de.e_nexus.vr.tk.VRFrame;
@ApplicationScoped
@Service
public class StartIDE implements VRClientStatusListener, VRClientRequestAppInfo, VRClientHelmetAndControllerListener, VRClientKeyboardListener {
/**
* The logger for this class.
*/
private static final Logger LOG = Logger.getLogger(StartIDE.class.getCanonicalName());
private final static Object lock = new Object();
private VRServer vrServer;
public void notifyStatus(boolean connected) {
if (!connected) {
synchronized (lock) {
lock.notify();
}
}
}
@Reference
@Inject
private VRServerService vrServerService;
private VRFrame applicationFrame;
@PostConstruct
public void initialize() {
LOG.fine("Starting VR IDE");
vrServer = vrServerService.getVRServer();
applicationFrame = new VRFrame(vrServer, "test");
LOG.info(getLatin1Title() + " started successfully!");
}
@PreDestroy
public void teardown() {
applicationFrame.remove();
LOG.info("Stoped " + getLatin1Title() + " successfully!");
vrServer = null;
}
public VRServer getVrServer() {
return vrServer;
}
@Override
public void notify(HelmetAndControllerInfo haci) {
}
@Override
public String getLatin1Title() {
return "VR IDE";
}
@Override
public void notifyKeyboardEvent(ClientKeyboardScancode[] downs, ClientKeyboardScancode[] ups, long incomingTime) {
System.out.println("me");
}
}
编辑：
这是完整的堆栈跟踪：
java.lang.NoClassDefFoundError: Lde/e_nexus/vr/tk/VRFrame;
at java.lang.Class.getDeclaredFields0(Native Method) ~[?:1.8.0_232]
at java.lang.Class.privateGetDeclaredFields(Class.java:2611) ~[?:1.8.0_232]
at java.lang.Class.getDeclaredFields(Class.java:1944) ~[?:1.8.0_232]
at org.apache.aries.cdi.container.internal.util.Reflection.allFields(Reflection.java:47) ~[!/:1.1.3]
at org.apache.aries.cdi.container.internal.annotated.AnnotatedTypeImpl.<init>(AnnotatedTypeImpl.java:42) ~[!/:1.1.3]
at org.apache.aries.cdi.container.internal.container.Discovery.lambda$discover(Discovery.java:133) ~[!/:1.1.3]
at java.util.HashMap$Values.forEach(HashMap.java:981) ~[?:1.8.0_232]
at org.apache.aries.cdi.container.internal.container.Discovery.discover(Discovery.java:130) ~[!/:1.1.3]
at org.apache.aries.cdi.container.internal.container.ContainerState.<init>(ContainerState.java:178) ~[!/:1.1.3]
at org.apache.aries.cdi.container.internal.Activator.doCreateExtension(Activator.java:209) [!/:1.1.3]
at org.apache.felix.utils.extender.AbstractExtender.createExtension(AbstractExtender.java:242) [!/:1.1.3]
at org.apache.felix.utils.extender.AbstractExtender.modifiedBundle(AbstractExtender.java:227) [!/:1.1.3]
at org.osgi.util.tracker.BundleTracker$Tracked.customizerModified(BundleTracker.java:488) [osgi.core-7.0.0.jar:?]
at org.osgi.util.tracker.BundleTracker$Tracked.customizerModified(BundleTracker.java:420) [osgi.core-7.0.0.jar:?]
at org.osgi.util.tracker.AbstractTracked.track(AbstractTracked.java:232) [osgi.core-7.0.0.jar:?]
at org.osgi.util.tracker.BundleTracker$Tracked.bundleChanged(BundleTracker.java:450) [osgi.core-7.0.0.jar:?]
at org.apache.felix.framework.EventDispatcher.invokeBundleListenerCallback(EventDispatcher.java:915) [org.apache.felix.framework-6.0.3.jar:?]
at org.apache.felix.framework.EventDispatcher.fireEventImmediately(EventDispatcher.java:834) [org.apache.felix.framework-6.0.3.jar:?]
at org.apache.felix.framework.EventDispatcher.fireBundleEvent(EventDispatcher.java:516) [org.apache.felix.framework-6.0.3.jar:?]
at org.apache.felix.framework.Felix.fireBundleEvent(Felix.java:4817) [org.apache.felix.framework-6.0.3.jar:?]
at org.apache.felix.framework.Felix.startBundle(Felix.java:2336) [org.apache.felix.framework-6.0.3.jar:?]
at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:998) [org.apache.felix.framework-6.0.3.jar:?]
at org.apache.felix.fileinstall.internal.DirectoryWatcher.startBundle(DirectoryWatcher.java:1260) [!/:3.6.8]
at org.apache.felix.fileinstall.internal.DirectoryWatcher.startBundles(DirectoryWatcher.java:1233) [!/:3.6.8]
at org.apache.felix.fileinstall.internal.DirectoryWatcher.doProcess(DirectoryWatcher.java:520) [!/:3.6.8]
at org.apache.felix.fileinstall.internal.DirectoryWatcher.process(DirectoryWatcher.java:365) [!/:3.6.8]
at org.apache.felix.fileinstall.internal.DirectoryWatcher.run(DirectoryWatcher.java:316) [!/:3.6.8]
Caused by: java.lang.ClassNotFoundException: de.e_nexus.vr.tk.VRFrame not found by de.e-nexus.component [87]
at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1597) ~[?:?]
at org.apache.felix.framework.BundleWiringImpl.access0(BundleWiringImpl.java:79) ~[?:?]
at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1982) ~[?:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_232]
at org.apache.felix.framework.BundleWiringImpl.getClassByDelegation(BundleWiringImpl.java:1375) ~[?:?]
at org.apache.felix.framework.BundleWiringImpl.searchImports(BundleWiringImpl.java:1618) ~[?:?]
at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1548) ~[?:?]
at org.apache.felix.framework.BundleWiringImpl.access0(BundleWiringImpl.java:79) ~[?:?]
at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1982) ~[?:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_232]
... 27 more
项目中的主要问题是<extensions>true</extensions>在maven-bundle-plugin中。你需要把它放在你的 pom.xml 中。示例代码
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<version>5.1.1</version>
<extensions>true</extensions>
<configuration>
<instructions>
<Bundle-SymbolicName>${project.artifactId}</Bundle-SymbolicName>
<Bundle-Version>${project.version}</Bundle-Version>
<Bundle-Activator>${Bundle-Activator}</Bundle-Activator>
<Export-Package>
de.*;version=${project.version}
</Export-Package>
<Import-Package>
*
</Import-Package>
</instructions>
</configuration>
</plugin>
对于 OSGI 包，包装应该像 <packaging>bundle</packaging> 一样。你可以看到包是如何从这个命令创建的
mvn archetype:generate \
-DarchetypeGroupId=org.apache.karaf.archetypes \
-DarchetypeArtifactId=karaf-bundle-archetype \
-DarchetypeVersion=4.3.0 \
-DgroupId=io.github.ozkanpakdil \
-DartifactId=myfirstbundle \
-Dversion=1.0-SNAPSHOT \
-Dpackage=io.github.ozkanpakdil
https://karaf.apache.org/manual/latest/#_creating_bundles 解释得很好。除此之外，我强烈建议使用不带下划线的命名空间。而不是“e_nexus”有 enexus 而对于 <groupId>de.e-nexus</groupId> 有 <groupId>de.enexus</groupId>。最后但并非最不重要的是 <artifactId>vr.server</artifactId> 有 <artifactId>vrserver</artifactId>，我建议这些是因为 OSGI 已经是复杂的环境，简单易用的名称将更容易发现错误和维护代码。如果您移动到另一个 OS，它也可以防止出现问题，您永远不知道它们在 OS 之间的行为如何。
有一些警告与同一命名空间在不同的 jars 中有关，我相应地更改了“框架”和“组件”模块中的代码。下面是来自本地的日志，我可以看到 VR-Client 日志，我认为它按预期开始工作了。
ozkan@DESKTOP-NF90OD6 MINGW64 /c/Program Files/apache-karaf-4.3.0/bin
$ ./karaf
__ __ ____
/ //_/____ __________ _/ __/
/ ,< / __ `/ ___/ __ `/ /_
/ /| |/ /_/ / / / /_/ / __/
/_/ |_|\__,_/_/ \__,_/_/
Apache Karaf (4.3.0)
Hit '<tab>' for a list of available commands
and '[cmd] --help' for help on a specific command.
Hit '<ctrl-d>' or type 'system:shutdown' or 'logout' to shutdown Karaf.
Start Osgi spiced VR Server ... [OK] @10:23 (You might get asked by the firewall if you like to allow java to communicate to other systems. In order to connect the local VR-Client you are requested to grant the communication.)
karaf@root()> bundle:list
START LEVEL 100 , List Threshold: 50
ID | State | Lvl | Version | Name
---+----------+-----+--------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------
31 | Active | 80 | 4.3.0 | Apache Karaf :: OSGi Services :: Event
55 | Active | 80 | 1.0.0 | Virtual reality server
56 | Active | 80 | 0.0.1.SNAPSHOT | VRComponent
57 | Active | 80 | 0.0.1.SNAPSHOT | VRFrame
58 | Active | 80 | 1.3.2 | Apache Aries SPI Fly Dynamic Weaving Bundle
59 | Active | 80 | 9.0.0 | org.objectweb.asm
60 | Active | 80 | 9.0.0 | org.objectweb.asm.commons
61 | Active | 80 | 9.0.0 | org.objectweb.asm.tree
62 | Active | 80 | 9.0.0 | org.objectweb.asm.tree.analysis
63 | Active | 80 | 9.0.0 | org.objectweb.asm.util
64 | Active | 80 | 2.0.17 | OpenWebBeans Core
65 | Active | 80 | 2.0.17 | SPI definition
66 | Active | 80 | 1.1.3 | Apache Aries CDI - CDI Component Runtime (CCR)
67 | Active | 80 | 1.1.3 | Apache Aries CDI - SPI classes for Portable Extensions
68 | Active | 80 | 1.1.3 | Apache Aries CDI - Container using Apache OpenWebBeans
69 | Active | 80 | 1.1.3 | Apache Aries CDI - SPI
70 | Active | 80 | 1.0.12 | Apache Felix Converter
71 | Active | 80 | 1.2.0 | Apache Geronimo JSR-330 Spec 1.0
72 | Active | 80 | 1.1.0 | Apache Geronimo Expression Language Spec 2.2
73 | Active | 80 | 1.2.0 | Apache Geronimo Interceptor Spec 1.2
74 | Active | 80 | 1.2.0 | Apache Geronimo JCDI Spec 2.0
75 | Active | 80 | 1.3.0.3 | Apache ServiceMix :: Specs :: Annotation API 1.3
76 | Active | 80 | 4.17.0 | Apache XBean :: ASM shaded (repackaged)
77 | Active | 80 | 4.17.0 | Apache XBean OSGI Bundle Utilities
78 | Active | 80 | 4.17.0 | Apache XBean :: Finder shaded (repackaged)
79 | Active | 80 | 1.0.1.201505202024 | org.osgi:org.osgi.namespace.extender
80 | Active | 80 | 1.0.0.201505202024 | org.osgi:org.osgi.namespace.implementation
81 | Active | 80 | 1.0.0.201505202024 | org.osgi:org.osgi.namespace.service
82 | Active | 80 | 1.0.0.201810101357 | org.osgi:org.osgi.service.cdi
83 | Active | 80 | 1.1.0.201802012106 | org.osgi:org.osgi.util.function
84 | Active | 80 | 1.1.0.201802012106 | org.osgi:org.osgi.util.promise
85 | Resolved | 80 | 4.3.1.SNAPSHOT | Apache Karaf :: OSGi Services :: Event
86 | Active | 80 | 0.0.1.SNAPSHOT | Virtual reality integrated development environment (VRIDE)
karaf@root()> log:display
10:23:10.508 INFO [activator-1-thread-2] Registering commands for bundle org.apache.karaf.log.core/4.3.0
10:23:10.821 INFO [activator-1-thread-2] Deployment finished. Registering FeatureDeploymentListener
10:23:10.821 INFO [activator-1-thread-2] Registering commands for bundle org.apache.karaf.features.command/4.3.0
10:23:10.828 INFO [activator-1-thread-3] Registering commands for bundle org.apache.karaf.kar.core/4.3.0
10:23:10.855 INFO [FelixStartLevel] Command registration delayed for bundle org.apache.karaf.shell.ssh/4.3.0. Missing service: [org.apache.sshd.server.SshServer]
10:23:10.871 INFO [FelixStartLevel] Registering commands for bundle org.apache.karaf.system.core/4.3.0
10:23:10.893 INFO [FelixStartLevel] Registering commands for bundle org.apache.karaf.event/4.3.0
10:23:11.089 INFO [activator-1-thread-1] Registering commands for bundle org.apache.karaf.shell.ssh/4.3.0
10:23:11.128 INFO [activator-1-thread-1] No detected/configured IoServiceFactoryFactory using Nio2ServiceFactoryFactory
10:23:12.346 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.PackageStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=packageState,version=1.5,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.346 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.wiring.BundleWiringStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=wiringState,version=1.1,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.346 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.BundleStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=bundleState,version=1.7,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.351 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.ServiceStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=serviceState,version=1.7,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.352 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.FrameworkMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=framework,version=1.7,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.353 INFO [activator-1-thread-1] Registering org.osgi.jmx.service.cm.ConfigurationAdminMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.compendium:service=cm,version=1.3,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.388 INFO [activator-1-thread-1] Unregistering org.osgi.jmx.framework.PackageStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=packageState,version=1.5,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.389 INFO [activator-1-thread-1] Unregistering org.osgi.jmx.framework.wiring.BundleWiringStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=wiringState,version=1.1,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.390 INFO [activator-1-thread-1] Unregistering org.osgi.jmx.framework.BundleStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=bundleState,version=1.7,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.390 INFO [activator-1-thread-1] Unregistering org.osgi.jmx.framework.ServiceStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=serviceState,version=1.7,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.391 INFO [activator-1-thread-1] Unregistering org.osgi.jmx.framework.FrameworkMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=framework,version=1.7,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.392 INFO [activator-1-thread-1] Unregistering org.osgi.jmx.service.cm.ConfigurationAdminMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.compendium:service=cm,version=1.3,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.394 WARN [activator-1-thread-1] Task rejected for JMX Notification dispatch of event [org.osgi.framework.ServiceEvent[source=[javax.management.MBeanServer]]] - Dispatcher may have been shutdown
10:23:12.420 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.PackageStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@4a85005 with name osgi.core:type=packageState,version=1.5,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.421 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.wiring.BundleWiringStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@4a85005 with name osgi.core:type=wiringState,version=1.1,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.422 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.BundleStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@4a85005 with name osgi.core:type=bundleState,version=1.7,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.423 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.ServiceStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@4a85005 with name osgi.core:type=serviceState,version=1.7,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.423 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.FrameworkMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@4a85005 with name osgi.core:type=framework,version=1.7,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.424 INFO [activator-1-thread-1] Registering org.osgi.jmx.service.cm.ConfigurationAdminMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@4a85005 with name osgi.compendium:service=cm,version=1.3,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
正如日志记录指出的那样：
Caused by: java.lang.ClassNotFoundException: de.e_nexus.vr.tk.VRFrame not found by de.e-nexus.component [87]
什么意思是 Karaf 正在从组件子模块中搜索 VRFrame，这显然不存在。
这是有道理的，因为所有 java 包都已导出，VRFrame 的包不明确。我遵循了 özkan pakdil 所说的并将 java-packages 重命名为一个唯一的名称。从那以后，它就像一个魅力。
谢谢厄兹坎！您的回答包含一些有用的提示，而我的问题的根源是模棱两可的包名。
我尝试创建一个基于 Karaf 的基本虚拟现实 IDE。
我有 3 个 maven 项目：
- 连接到本地组件进行渲染的 VRServer。
- VR-HMI-Widgets 的 VR 组件工具包（具有从 VRComponent 扩展的 VRFrame）作为多模块 Maven 项目。
- VR IDE 项目 read/write 文件并执行低级命令。
我将它们全部安装到 Karaf 中：
karaf@root()> bundle:list
START LEVEL 100 , List Threshold: 50
ID | State | Lvl | Version | Name
----+--------+-----+--------------------+---------------------------------------------------------------------------
31 | Active | 80 | 4.3.0 | Apache Karaf :: OSGi Services :: Event
54 | Active | 80 | 1.3.2 | Apache Aries SPI Fly Dynamic Weaving Bundle
55 | Active | 80 | 9.0.0 | org.objectweb.asm
56 | Active | 80 | 9.0.0 | org.objectweb.asm.commons
57 | Active | 80 | 9.0.0 | org.objectweb.asm.tree
58 | Active | 80 | 9.0.0 | org.objectweb.asm.tree.analysis
59 | Active | 80 | 9.0.0 | org.objectweb.asm.util
60 | Active | 80 | 2.0.17 | OpenWebBeans Core
61 | Active | 80 | 2.0.17 | SPI definition
62 | Active | 80 | 1.1.3 | Apache Aries CDI - CDI Component Runtime (CCR)
63 | Active | 80 | 1.1.3 | Apache Aries CDI - SPI classes for Portable Extensions
64 | Active | 80 | 1.1.3 | Apache Aries CDI - Container using Apache OpenWebBeans
65 | Active | 80 | 1.1.3 | Apache Aries CDI - SPI
66 | Active | 80 | 1.0.12 | Apache Felix Converter
67 | Active | 80 | 1.2.0 | Apache Geronimo JSR-330 Spec 1.0
68 | Active | 80 | 1.1.0 | Apache Geronimo Expression Language Spec 2.2
69 | Active | 80 | 1.2.0 | Apache Geronimo Interceptor Spec 1.2
70 | Active | 80 | 1.2.0 | Apache Geronimo JCDI Spec 2.0
71 | Active | 80 | 1.3.0.3 | Apache ServiceMix :: Specs :: Annotation API 1.3
72 | Active | 80 | 4.17.0 | Apache XBean :: ASM shaded (repackaged)
73 | Active | 80 | 4.17.0 | Apache XBean OSGI Bundle Utilities
74 | Active | 80 | 4.17.0 | Apache XBean :: Finder shaded (repackaged)
75 | Active | 80 | 1.0.1.201505202024 | org.osgi:org.osgi.namespace.extender
76 | Active | 80 | 1.0.0.201505202024 | org.osgi:org.osgi.namespace.implementation
77 | Active | 80 | 1.0.0.201505202024 | org.osgi:org.osgi.namespace.service
78 | Active | 80 | 1.0.0.201810101357 | org.osgi:org.osgi.service.cdi
79 | Active | 80 | 1.1.0.201802012106 | org.osgi:org.osgi.util.function
80 | Active | 80 | 1.1.0.201802012106 | org.osgi:org.osgi.util.promise
81 | Active | 80 | 4.3.1.SNAPSHOT | Apache Karaf :: OSGi Services :: Event
134 | Active | 80 | 1.0.0 | Virtual reality server
135 | Active | 80 | 0.0.1.SNAPSHOT | VRComponent
136 | Active | 80 | 0.0.1.SNAPSHOT | VRFrame
142 | Active | 80 | 0.0.1.SNAPSHOT | Virtual reality integrated development environment (VRIDE)
karaf@root()>
但是当我尝试启动 VRIDE 包时，出现了这个异常：
10:00:42.193 WARN [fileinstall-C:\Program Files\apache-karaf-4.3.0/deploy] Error while creating extension
java.lang.NoClassDefFoundError: Lde/e_nexus/vr/tk/VRFrame;
at java.lang.Class.getDeclaredFields0(Native Method) ~[?:1.8.0_232]
at java.lang.Class.privateGetDeclaredFields(Class.java:2611) ~[?:1.8.0_232]
at java.lang.Class.getDeclaredFields(Class.java:1944) ~[?:1.8.0_232]
at org.apache.aries.cdi.container.internal.util.Reflection.allFields(Reflection.java:47) ~[!/:1.1.3]
at org.apache.aries.cdi.container.internal.annotated.AnnotatedTypeImpl.<init>(AnnotatedTypeImpl.java:42) ~[!/:1.1.3]
at org.apache.aries.cdi.container.internal.container.Discovery.lambda$discover(Discovery.java:133) ~[!/:1.1.3]
at java.util.HashMap$Values.forEach(HashMap.java:981) ~[?:1.8.0_232]
这是我尝试加载的 Java-Class：
package de.e_nexus.desktop.vr.ide;
import java.util.logging.Logger;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;
import org.osgi.service.cdi.annotations.Reference;
import org.osgi.service.cdi.annotations.Service;
import de.e_nexus.vr.server.ClientKeyboardScancode;
import de.e_nexus.vr.server.VRClientHelmetAndControllerListener;
import de.e_nexus.vr.server.VRClientKeyboardListener;
import de.e_nexus.vr.server.VRServer;
import de.e_nexus.vr.server.listeners.VRClientRequestAppInfo;
import de.e_nexus.vr.server.listeners.VRClientStatusListener;
import de.e_nexus.vr.server.listeners.interaction.HelmetAndControllerInfo;
import de.e_nexus.vr.server.osgi.inter.VRServerService;
import de.e_nexus.vr.tk.VRFrame;
@ApplicationScoped
@Service
public class StartIDE implements VRClientStatusListener, VRClientRequestAppInfo, VRClientHelmetAndControllerListener, VRClientKeyboardListener {
/**
* The logger for this class.
*/
private static final Logger LOG = Logger.getLogger(StartIDE.class.getCanonicalName());
private final static Object lock = new Object();
private VRServer vrServer;
public void notifyStatus(boolean connected) {
if (!connected) {
synchronized (lock) {
lock.notify();
}
}
}
@Reference
@Inject
private VRServerService vrServerService;
private VRFrame applicationFrame;
@PostConstruct
public void initialize() {
LOG.fine("Starting VR IDE");
vrServer = vrServerService.getVRServer();
applicationFrame = new VRFrame(vrServer, "test");
LOG.info(getLatin1Title() + " started successfully!");
}
@PreDestroy
public void teardown() {
applicationFrame.remove();
LOG.info("Stoped " + getLatin1Title() + " successfully!");
vrServer = null;
}
public VRServer getVrServer() {
return vrServer;
}
@Override
public void notify(HelmetAndControllerInfo haci) {
}
@Override
public String getLatin1Title() {
return "VR IDE";
}
@Override
public void notifyKeyboardEvent(ClientKeyboardScancode[] downs, ClientKeyboardScancode[] ups, long incomingTime) {
System.out.println("me");
}
}
编辑：
这是完整的堆栈跟踪：
java.lang.NoClassDefFoundError: Lde/e_nexus/vr/tk/VRFrame;
at java.lang.Class.getDeclaredFields0(Native Method) ~[?:1.8.0_232]
at java.lang.Class.privateGetDeclaredFields(Class.java:2611) ~[?:1.8.0_232]
at java.lang.Class.getDeclaredFields(Class.java:1944) ~[?:1.8.0_232]
at org.apache.aries.cdi.container.internal.util.Reflection.allFields(Reflection.java:47) ~[!/:1.1.3]
at org.apache.aries.cdi.container.internal.annotated.AnnotatedTypeImpl.<init>(AnnotatedTypeImpl.java:42) ~[!/:1.1.3]
at org.apache.aries.cdi.container.internal.container.Discovery.lambda$discover(Discovery.java:133) ~[!/:1.1.3]
at java.util.HashMap$Values.forEach(HashMap.java:981) ~[?:1.8.0_232]
at org.apache.aries.cdi.container.internal.container.Discovery.discover(Discovery.java:130) ~[!/:1.1.3]
at org.apache.aries.cdi.container.internal.container.ContainerState.<init>(ContainerState.java:178) ~[!/:1.1.3]
at org.apache.aries.cdi.container.internal.Activator.doCreateExtension(Activator.java:209) [!/:1.1.3]
at org.apache.felix.utils.extender.AbstractExtender.createExtension(AbstractExtender.java:242) [!/:1.1.3]
at org.apache.felix.utils.extender.AbstractExtender.modifiedBundle(AbstractExtender.java:227) [!/:1.1.3]
at org.osgi.util.tracker.BundleTracker$Tracked.customizerModified(BundleTracker.java:488) [osgi.core-7.0.0.jar:?]
at org.osgi.util.tracker.BundleTracker$Tracked.customizerModified(BundleTracker.java:420) [osgi.core-7.0.0.jar:?]
at org.osgi.util.tracker.AbstractTracked.track(AbstractTracked.java:232) [osgi.core-7.0.0.jar:?]
at org.osgi.util.tracker.BundleTracker$Tracked.bundleChanged(BundleTracker.java:450) [osgi.core-7.0.0.jar:?]
at org.apache.felix.framework.EventDispatcher.invokeBundleListenerCallback(EventDispatcher.java:915) [org.apache.felix.framework-6.0.3.jar:?]
at org.apache.felix.framework.EventDispatcher.fireEventImmediately(EventDispatcher.java:834) [org.apache.felix.framework-6.0.3.jar:?]
at org.apache.felix.framework.EventDispatcher.fireBundleEvent(EventDispatcher.java:516) [org.apache.felix.framework-6.0.3.jar:?]
at org.apache.felix.framework.Felix.fireBundleEvent(Felix.java:4817) [org.apache.felix.framework-6.0.3.jar:?]
at org.apache.felix.framework.Felix.startBundle(Felix.java:2336) [org.apache.felix.framework-6.0.3.jar:?]
at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:998) [org.apache.felix.framework-6.0.3.jar:?]
at org.apache.felix.fileinstall.internal.DirectoryWatcher.startBundle(DirectoryWatcher.java:1260) [!/:3.6.8]
at org.apache.felix.fileinstall.internal.DirectoryWatcher.startBundles(DirectoryWatcher.java:1233) [!/:3.6.8]
at org.apache.felix.fileinstall.internal.DirectoryWatcher.doProcess(DirectoryWatcher.java:520) [!/:3.6.8]
at org.apache.felix.fileinstall.internal.DirectoryWatcher.process(DirectoryWatcher.java:365) [!/:3.6.8]
at org.apache.felix.fileinstall.internal.DirectoryWatcher.run(DirectoryWatcher.java:316) [!/:3.6.8]
Caused by: java.lang.ClassNotFoundException: de.e_nexus.vr.tk.VRFrame not found by de.e-nexus.component [87]
at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1597) ~[?:?]
at org.apache.felix.framework.BundleWiringImpl.access0(BundleWiringImpl.java:79) ~[?:?]
at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1982) ~[?:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_232]
at org.apache.felix.framework.BundleWiringImpl.getClassByDelegation(BundleWiringImpl.java:1375) ~[?:?]
at org.apache.felix.framework.BundleWiringImpl.searchImports(BundleWiringImpl.java:1618) ~[?:?]
at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1548) ~[?:?]
at org.apache.felix.framework.BundleWiringImpl.access0(BundleWiringImpl.java:79) ~[?:?]
at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1982) ~[?:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_232]
... 27 more
项目中的主要问题是<extensions>true</extensions>在maven-bundle-plugin中。你需要把它放在你的 pom.xml 中。示例代码
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<version>5.1.1</version>
<extensions>true</extensions>
<configuration>
<instructions>
<Bundle-SymbolicName>${project.artifactId}</Bundle-SymbolicName>
<Bundle-Version>${project.version}</Bundle-Version>
<Bundle-Activator>${Bundle-Activator}</Bundle-Activator>
<Export-Package>
de.*;version=${project.version}
</Export-Package>
<Import-Package>
*
</Import-Package>
</instructions>
</configuration>
</plugin>
对于 OSGI 包，包装应该像 <packaging>bundle</packaging> 一样。你可以看到包是如何从这个命令创建的
mvn archetype:generate \
-DarchetypeGroupId=org.apache.karaf.archetypes \
-DarchetypeArtifactId=karaf-bundle-archetype \
-DarchetypeVersion=4.3.0 \
-DgroupId=io.github.ozkanpakdil \
-DartifactId=myfirstbundle \
-Dversion=1.0-SNAPSHOT \
-Dpackage=io.github.ozkanpakdil
https://karaf.apache.org/manual/latest/#_creating_bundles 解释得很好。除此之外，我强烈建议使用不带下划线的命名空间。而不是“e_nexus”有 enexus 而对于 <groupId>de.e-nexus</groupId> 有 <groupId>de.enexus</groupId>。最后但并非最不重要的是 <artifactId>vr.server</artifactId> 有 <artifactId>vrserver</artifactId>，我建议这些是因为 OSGI 已经是复杂的环境，简单易用的名称将更容易发现错误和维护代码。如果您移动到另一个 OS，它也可以防止出现问题，您永远不知道它们在 OS 之间的行为如何。
有一些警告与同一命名空间在不同的 jars 中有关，我相应地更改了“框架”和“组件”模块中的代码。下面是来自本地的日志，我可以看到 VR-Client 日志，我认为它按预期开始工作了。
ozkan@DESKTOP-NF90OD6 MINGW64 /c/Program Files/apache-karaf-4.3.0/bin
$ ./karaf
__ __ ____
/ //_/____ __________ _/ __/
/ ,< / __ `/ ___/ __ `/ /_
/ /| |/ /_/ / / / /_/ / __/
/_/ |_|\__,_/_/ \__,_/_/
Apache Karaf (4.3.0)
Hit '<tab>' for a list of available commands
and '[cmd] --help' for help on a specific command.
Hit '<ctrl-d>' or type 'system:shutdown' or 'logout' to shutdown Karaf.
Start Osgi spiced VR Server ... [OK] @10:23 (You might get asked by the firewall if you like to allow java to communicate to other systems. In order to connect the local VR-Client you are requested to grant the communication.)
karaf@root()> bundle:list
START LEVEL 100 , List Threshold: 50
ID | State | Lvl | Version | Name
---+----------+-----+--------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------
31 | Active | 80 | 4.3.0 | Apache Karaf :: OSGi Services :: Event
55 | Active | 80 | 1.0.0 | Virtual reality server
56 | Active | 80 | 0.0.1.SNAPSHOT | VRComponent
57 | Active | 80 | 0.0.1.SNAPSHOT | VRFrame
58 | Active | 80 | 1.3.2 | Apache Aries SPI Fly Dynamic Weaving Bundle
59 | Active | 80 | 9.0.0 | org.objectweb.asm
60 | Active | 80 | 9.0.0 | org.objectweb.asm.commons
61 | Active | 80 | 9.0.0 | org.objectweb.asm.tree
62 | Active | 80 | 9.0.0 | org.objectweb.asm.tree.analysis
63 | Active | 80 | 9.0.0 | org.objectweb.asm.util
64 | Active | 80 | 2.0.17 | OpenWebBeans Core
65 | Active | 80 | 2.0.17 | SPI definition
66 | Active | 80 | 1.1.3 | Apache Aries CDI - CDI Component Runtime (CCR)
67 | Active | 80 | 1.1.3 | Apache Aries CDI - SPI classes for Portable Extensions
68 | Active | 80 | 1.1.3 | Apache Aries CDI - Container using Apache OpenWebBeans
69 | Active | 80 | 1.1.3 | Apache Aries CDI - SPI
70 | Active | 80 | 1.0.12 | Apache Felix Converter
71 | Active | 80 | 1.2.0 | Apache Geronimo JSR-330 Spec 1.0
72 | Active | 80 | 1.1.0 | Apache Geronimo Expression Language Spec 2.2
73 | Active | 80 | 1.2.0 | Apache Geronimo Interceptor Spec 1.2
74 | Active | 80 | 1.2.0 | Apache Geronimo JCDI Spec 2.0
75 | Active | 80 | 1.3.0.3 | Apache ServiceMix :: Specs :: Annotation API 1.3
76 | Active | 80 | 4.17.0 | Apache XBean :: ASM shaded (repackaged)
77 | Active | 80 | 4.17.0 | Apache XBean OSGI Bundle Utilities
78 | Active | 80 | 4.17.0 | Apache XBean :: Finder shaded (repackaged)
79 | Active | 80 | 1.0.1.201505202024 | org.osgi:org.osgi.namespace.extender
80 | Active | 80 | 1.0.0.201505202024 | org.osgi:org.osgi.namespace.implementation
81 | Active | 80 | 1.0.0.201505202024 | org.osgi:org.osgi.namespace.service
82 | Active | 80 | 1.0.0.201810101357 | org.osgi:org.osgi.service.cdi
83 | Active | 80 | 1.1.0.201802012106 | org.osgi:org.osgi.util.function
84 | Active | 80 | 1.1.0.201802012106 | org.osgi:org.osgi.util.promise
85 | Resolved | 80 | 4.3.1.SNAPSHOT | Apache Karaf :: OSGi Services :: Event
86 | Active | 80 | 0.0.1.SNAPSHOT | Virtual reality integrated development environment (VRIDE)
karaf@root()> log:display
10:23:10.508 INFO [activator-1-thread-2] Registering commands for bundle org.apache.karaf.log.core/4.3.0
10:23:10.821 INFO [activator-1-thread-2] Deployment finished. Registering FeatureDeploymentListener
10:23:10.821 INFO [activator-1-thread-2] Registering commands for bundle org.apache.karaf.features.command/4.3.0
10:23:10.828 INFO [activator-1-thread-3] Registering commands for bundle org.apache.karaf.kar.core/4.3.0
10:23:10.855 INFO [FelixStartLevel] Command registration delayed for bundle org.apache.karaf.shell.ssh/4.3.0. Missing service: [org.apache.sshd.server.SshServer]
10:23:10.871 INFO [FelixStartLevel] Registering commands for bundle org.apache.karaf.system.core/4.3.0
10:23:10.893 INFO [FelixStartLevel] Registering commands for bundle org.apache.karaf.event/4.3.0
10:23:11.089 INFO [activator-1-thread-1] Registering commands for bundle org.apache.karaf.shell.ssh/4.3.0
10:23:11.128 INFO [activator-1-thread-1] No detected/configured IoServiceFactoryFactory using Nio2ServiceFactoryFactory
10:23:12.346 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.PackageStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=packageState,version=1.5,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.346 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.wiring.BundleWiringStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=wiringState,version=1.1,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.346 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.BundleStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=bundleState,version=1.7,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.351 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.ServiceStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=serviceState,version=1.7,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.352 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.FrameworkMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=framework,version=1.7,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.353 INFO [activator-1-thread-1] Registering org.osgi.jmx.service.cm.ConfigurationAdminMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.compendium:service=cm,version=1.3,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.388 INFO [activator-1-thread-1] Unregistering org.osgi.jmx.framework.PackageStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=packageState,version=1.5,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.389 INFO [activator-1-thread-1] Unregistering org.osgi.jmx.framework.wiring.BundleWiringStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=wiringState,version=1.1,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.390 INFO [activator-1-thread-1] Unregistering org.osgi.jmx.framework.BundleStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=bundleState,version=1.7,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.390 INFO [activator-1-thread-1] Unregistering org.osgi.jmx.framework.ServiceStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=serviceState,version=1.7,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.391 INFO [activator-1-thread-1] Unregistering org.osgi.jmx.framework.FrameworkMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.core:type=framework,version=1.7,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.392 INFO [activator-1-thread-1] Unregistering org.osgi.jmx.service.cm.ConfigurationAdminMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@a766065 with name osgi.compendium:service=cm,version=1.3,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.394 WARN [activator-1-thread-1] Task rejected for JMX Notification dispatch of event [org.osgi.framework.ServiceEvent[source=[javax.management.MBeanServer]]] - Dispatcher may have been shutdown
10:23:12.420 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.PackageStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@4a85005 with name osgi.core:type=packageState,version=1.5,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.421 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.wiring.BundleWiringStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@4a85005 with name osgi.core:type=wiringState,version=1.1,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.422 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.BundleStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@4a85005 with name osgi.core:type=bundleState,version=1.7,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.423 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.ServiceStateMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@4a85005 with name osgi.core:type=serviceState,version=1.7,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.423 INFO [activator-1-thread-1] Registering org.osgi.jmx.framework.FrameworkMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@4a85005 with name osgi.core:type=framework,version=1.7,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
10:23:12.424 INFO [activator-1-thread-1] Registering org.osgi.jmx.service.cm.ConfigurationAdminMBean to MBeanServer org.apache.karaf.management.internal.EventAdminMBeanServerWrapper@4a85005 with name osgi.compendium:service=cm,version=1.3,framework=org.apache.felix.framework,uuid=1ba06c85-21b1-4145-9726-b08a81b6cad3
正如日志记录指出的那样：
Caused by: java.lang.ClassNotFoundException: de.e_nexus.vr.tk.VRFrame not found by de.e-nexus.component [87]
什么意思是 Karaf 正在从组件子模块中搜索 VRFrame，这显然不存在。
这是有道理的，因为所有 java 包都已导出，VRFrame 的包不明确。我遵循了 özkan pakdil 所说的并将 java-packages 重命名为一个唯一的名称。从那以后，它就像一个魅力。
谢谢厄兹坎！您的回答包含一些有用的提示，而我的问题的根源是模棱两可的包名。