Question

iPOJO API似乎很难处理，特别是在嵌入OSGI框架时。在通过将API编码行保留在OSGI包中来完成类加载器问题之后，我在这里遇到了一个新的不同问题：

在我的bundle start方法中，我有以下代码：

public void start(BundleContext context)
{

    ComponentType x = new PrimitiveComponentType()
            .setBundleContext(context)
            .setClassName(InstanceFactoryImpl.class.getName())
            .setValidateMethod("start")
            .setInvalidateMethod("stop");


            x.start();

            try {
                x.createInstance();
            } catch (UnacceptableConfiguration e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (MissingHandlerException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (ConfigurationException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            System.out.println("and we are done!");
}

InstanceFactoryImpl类与以下内容位于同一个包中：

public class InstanceFactoryImpl implements instancefactory.InstanceFactory{


    @Override
    public void start() {



    }

    @Override
    public void stop() {

    }



}

当我在我的java应用程序中将我的包加载到Felix框架时，我收到以下错误：

[ERROR]  : [instancefactoryImpl.InstanceFactoryImpl-0] createInstance -> Cannot invoke the constructor (method not found) : instancefactoryImpl.InstanceFactoryImpl.<init>(org.apache.felix.ipojo.InstanceManager)
java.lang.NoSuchMethodException: instancefactoryImpl.InstanceFactoryImpl.<init>(org.apache.felix.ipojo.InstanceManager)
    at java.lang.Class.getConstructor0(Class.java:2715)
    at java.lang.Class.getDeclaredConstructor(Class.java:1987)
    at org.apache.felix.ipojo.InstanceManager.createObject(InstanceManager.java:726)
    at org.apache.felix.ipojo.InstanceManager.getPojoObject(InstanceManager.java:923)
    at org.apache.felix.ipojo.handlers.lifecycle.callback.LifecycleCallbackHandler.__M_stateChanged(LifecycleCallbackHandler.java:156)
    at org.apache.felix.ipojo.handlers.lifecycle.callback.LifecycleCallbackHandler.stateChanged(LifecycleCallbackHandler.java)
    at org.apache.felix.ipojo.InstanceManager.setState(InstanceManager.java:536)
    at org.apache.felix.ipojo.InstanceManager.start(InstanceManager.java:418)
    at org.apache.felix.ipojo.ComponentFactory.createInstance(ComponentFactory.java:179)
    at org.apache.felix.ipojo.IPojoFactory.createComponentInstance(IPojoFactory.java:319)
    at org.apache.felix.ipojo.IPojoFactory.createComponentInstance(IPojoFactory.java:240)
    at org.apache.felix.ipojo.api.ComponentType.createInstance(ComponentType.java:79)
    at instancefactoryImpl.Activator.start(Activator.java:37)
    at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:645)
    at org.apache.felix.framework.Felix.activateBundle(Felix.java:2146)
    at org.apache.felix.framework.Felix.startBundle(Felix.java:2064)
    at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:955)
    at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:942)
    at embedder.HostApplication.<init>(HostApplication.java:148)
    at embedder.Embedder.main(Embedder.java:12)
[ERROR] instancefactoryImpl.InstanceFactoryImpl : Cannot create a POJO instance, the POJO constructor cannot be found
org.apache.felix.ipojo.ConfigurationException: The configuration is not correct for the type instancefactoryImpl.InstanceFactoryImpl : Cannot create a POJO instance, the POJO constructor cannot be found
    at org.apache.felix.ipojo.IPojoFactory.createComponentInstance(IPojoFactory.java:328)
    at org.apache.felix.ipojo.IPojoFactory.createComponentInstance(IPojoFactory.java:240)
    at org.apache.felix.ipojo.api.ComponentType.createInstance(ComponentType.java:79)
    at instancefactoryImpl.Activator.start(Activator.java:37)
    at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:645)
    at org.apache.felix.framework.Felix.activateBundle(Felix.java:2146)
    at org.apache.felix.framework.Felix.startBundle(Felix.java:2064)
    at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:955)
    at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:942)
    at embedder.HostApplication.<init>(HostApplication.java:148)
    at embedder.Embedder.main(Embedder.java:12)
Caused by: org.apache.felix.ipojo.ConfigurationException: Cannot create a POJO instance, the POJO constructor cannot be found
    at org.apache.felix.ipojo.ComponentFactory.createInstance(ComponentFactory.java:191)
    at org.apache.felix.ipojo.IPojoFactory.createComponentInstance(IPojoFactory.java:319)
    ... 10 more
Caused by: java.lang.RuntimeException: Cannot create a POJO instance, the POJO constructor cannot be found
    at org.apache.felix.ipojo.InstanceManager.createObject(InstanceManager.java:766)
    at org.apache.felix.ipojo.InstanceManager.getPojoObject(InstanceManager.java:923)
    at org.apache.felix.ipojo.handlers.lifecycle.callback.LifecycleCallbackHandler.__M_stateChanged(LifecycleCallbackHandler.java:156)
    at org.apache.felix.ipojo.handlers.lifecycle.callback.LifecycleCallbackHandler.stateChanged(LifecycleCallbackHandler.java)
    at org.apache.felix.ipojo.InstanceManager.setState(InstanceManager.java:536)
    at org.apache.felix.ipojo.InstanceManager.start(InstanceManager.java:418)
    at org.apache.felix.ipojo.ComponentFactory.createInstance(ComponentFactory.java:179)
    ... 11 more
Caused by: java.lang.NoSuchMethodException: instancefactoryImpl.InstanceFactoryImpl.<init>(org.apache.felix.ipojo.InstanceManager)
    at java.lang.Class.getConstructor0(Class.java:2715)
    at java.lang.Class.getDeclaredConstructor(Class.java:1987)
    at org.apache.felix.ipojo.InstanceManager.createObject(InstanceManager.java:726)
    ... 17 more

我在以下行收到错误：

x.createInstance();

我尝试显式定义构造函数，并添加一个名为“init”的方法。所有这一切都失败了，同样的错误不断出现。我该怎么办？感谢？

Answer 1

iPOJO核心软件包与iPOJO API软件包之间的版本不匹配。如果您使用的是iPOJO 1.11.0，则需要使用iPOJO API 1.11.0。

在iPOJO 1.11.0中，我们改变了操纵器过程。这使得由较旧版本的iPOJO API检测的捆绑包不合适。

有关https://issues.apache.org/jira/browse/FELIX-4443

的更多详情

使用iPOJO API显示“无法创建POJO实例，无法找到POJO构造函数”

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