JavaOSGi：带有声明性服务的实例化异常

我是OSGi新手，正在构建第一个DS实现

所有内容都根据“本书”进行编码，但运行时会出现以下错误：

java.lang.InstantiationException: com.mine.logger.internal.udp.UdpListener
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at org.eclipse.equinox.internal.ds.model.ServiceComponent.createInstance(ServiceComponent.java:457)
at org.eclipse.equinox.internal.ds.model.ServiceComponentProp.createInstance(ServiceComponentProp.java:264)
at org.eclipse.equinox.internal.ds.model.ServiceComponentProp.build(ServiceComponentProp.java:325)
at org.eclipse.equinox.internal.ds.InstanceProcess.buildComponent(InstanceProcess.java:588)
at org.eclipse.equinox.internal.ds.InstanceProcess.buildComponents(InstanceProcess.java:196)
at org.eclipse.equinox.internal.ds.Resolver.getEligible(Resolver.java:328)
at org.eclipse.equinox.internal.ds.SCRManager.serviceChanged(SCRManager.java:221)
at org.eclipse.osgi.internal.serviceregistry.FilteredServiceListener.serviceChanged(FilteredServiceListener.java:104)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.dispatchEvent(BundleContextImpl.java:933)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:227)
at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:149)
at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEventPrivileged(ServiceRegistry.java:756)
at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.publishServiceEvent(ServiceRegistry.java:711)
at org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.register(ServiceRegistrationImpl.java:130)
at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.registerService(ServiceRegistry.java:206)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.registerService(BundleContextImpl.java:507)
at org.eclipse.equinox.internal.ds.InstanceProcess.registerService(InstanceProcess.java:504)
at org.eclipse.equinox.internal.ds.InstanceProcess.buildComponents(InstanceProcess.java:212)
at org.eclipse.equinox.internal.ds.Resolver.buildNewlySatisfied(Resolver.java:441)
at org.eclipse.equinox.internal.ds.Resolver.enableComponents(Resolver.java:213)
at org.eclipse.equinox.internal.ds.SCRManager.performWork(SCRManager.java:800)
at org.eclipse.equinox.internal.ds.SCRManager$QueuedJob.dispatch(SCRManager.java:767)
at org.eclipse.equinox.internal.ds.WorkThread.run(WorkThread.java:89)
at org.eclipse.equinox.internal.util.impl.tpt.threadpool.Executor.run(Executor.java:70)

这是我想在其他模块中使用的模块的configuration.xml：

<scr:component xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0" activate="startup" deactivate="shutdown" immediate="true" name="com.mine.logger.storeindb">
   <implementation class="com.mine.logger.internal.storeindb.StoreLog"/>
   <service>
      <provide interface="com.mine.logger.storeindb.IStoreLog"/>
   </service>
</scr:component>

有什么想法吗？ 谢谢

---

弗兰克打字错误？

IStoreLog

字段名为

storeLog

，但您说的是

name=“storeLog”

（小写

l

）。

：

当应用程序尝试使用class类中的newInstance方法创建类的实例，但无法实例化指定的class对象时引发。实例化可能因各种原因而失败，包括但不限于：

• class对象表示抽象类、接口、数组类、基元类型或void
• 该类没有空构造函数

com.mine.logger.internal.udp.UdpListener是否有一个公共的、没有参数的构造函数？
多亏了Thilo

添加了一个无参数函数，错误消失了

public UdpListener() 
{
    // public, no-args constructor needed for Declarative Services !!!
}

public UdpListener(int port) 
{
    this.port = port;
}

我也有类似的问题，因为引用了非公共类。比如：

在ServiceAImpl.java文件中：

class ServiceBImpl implements Service {
...
}

这是不幸的重构造成的后果。
不，同样的结果，名称似乎只是用作标签，而不是代码。同样的结果：你只是用评论回答了自己的问题。这不是一个论坛。您应该只接受正确答案和/或对其他答案或您的问题添加评论。如果你愿意，你也可以编辑你的问题。
public UdpListener() 
{
    // public, no-args constructor needed for Declarative Services !!!
}

public UdpListener(int port) 
{
    this.port = port;
}

class ServiceBImpl implements Service {
...
}