我正在使用 Wicket 和 PF4J 制作一个 Spring Boot 应用程序。我想在我的插件中使用 spring 服务。这些服务不使用插件类加载器之外的服务。在我的插件中，我可以有检票口面板。面板类可以使用 Spring 服务。
这里是插件的类：
public class MyPlugin extends SpringPlugin implements MyPluginConfiguration {
public MyPlugin(PluginWrapper wrapper) {
super(wrapper);
}
@Override
protected ApplicationContext createApplicationContext() {
final AnnotationConfigApplicationContext applicationContext = new AnnotationConfigApplicationContext();
applicationContext.setClassLoader(getWrapper().getPluginClassLoader());
applicationContext.register(SpringConfiguration.class);
applicationContext.refresh();
return applicationContext;
}
@Override
public Panel getConfigurationPanel(String wicketId) {
return new ConfigurationPanel(wicketId);
}
}
它的界面：
public interface MyPluginConfiguration {
Panel getConfigurationPanel(String wicketId);
}
SpringConfiguration 类：
@Configuration
public class SpringConfiguration {
@Bean
public LabelService getLabelService() {
return new LabelService();
}
}
配置面板：
public class ConfigurationPanel extends Panel {
@SpringBean
private LabelService labelService;
public ConfigurationPanel(String id) {
super(id);
add(new Label("text", labelService.getLabel()));
}
}
和服务：
@Service
public class LabelService {
public String getLabel() {
return "Hello World from the plugin.";
}
}
为了显示配置，我在我的应用程序中使用了这个页面：
public class PluginTestPage extends WebPage {
@SpringBean
private PluginManager pluginManager;
public PluginTestPage() {
final PluginWrapper pluginWrapper = pluginManager.getPlugin("example");
if (pluginWrapper.getPlugin() instanceof MyPluginConfiguration) {
final MyPluginConfiguration pluginConfiguration = (MyPluginConfiguration) pluginWrapper.getPlugin();
add(pluginConfiguration.getConfigurationPanel("configuration-panel"));
} else {
add(new Label("configuration-panel", "Can't get the configuration panel"));
}
}
}
当我询问 PluginTestPage 时，出现此错误：
org.apache.wicket.WicketRuntimeException: Can't instantiate page using constructor 'public com.example.pages.PluginTestPage()'. An exception has been thrown during construction!
at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:194) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:67) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.DefaultMapperContext.newPageInstance(DefaultMapperContext.java:90) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.core.request.handler.PageProvider$Provision.getPage(PageProvider.java:369) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.core.request.handler.PageProvider.getPageInstance(PageProvider.java:170) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.request.handler.render.PageRenderer.getPage(PageRenderer.java:78) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:231) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:202) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:917) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.request.RequestHandlerExecutor.execute(RequestHandlerExecutor.java:63) ~[wicket-request-9.0.0.jar:9.0.0]
at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:283) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:254) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:222) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:276) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:207) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:300) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1589) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
Caused by: java.lang.reflect.InvocationTargetException: null
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na]
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490) ~[na:na]
at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:175) ~[wicket-core-9.0.0.jar:9.0.0]
... 33 common frames omitted
Caused by: java.lang.IllegalStateException: Concrete bean could not be received from the application context for class: com.example.pf4j_wicket_spring.services.LabelService.
at org.apache.wicket.spring.SpringBeanLocator.lookupSpringBean(SpringBeanLocator.java:277) ~[wicket-spring-9.0.0.jar:9.0.0]
at org.apache.wicket.spring.SpringBeanLocator.locateProxyTarget(SpringBeanLocator.java:198) ~[wicket-spring-9.0.0.jar:9.0.0]
at org.apache.wicket.spring.injection.annot.AnnotProxyFieldValueFactory.getFieldValue(AnnotProxyFieldValueFactory.java:150) ~[wicket-spring-9.0.0.jar:9.0.0]
at org.apache.wicket.injection.Injector.inject(Injector.java:111) ~[wicket-ioc-9.0.0.jar:9.0.0]
at org.apache.wicket.spring.injection.annot.SpringComponentInjector.inject(SpringComponentInjector.java:124) ~[wicket-spring-9.0.0.jar:9.0.0]
at org.apache.wicket.spring.injection.annot.SpringComponentInjector.onInstantiation(SpringComponentInjector.java:130) ~[wicket-spring-9.0.0.jar:9.0.0]
at org.apache.wicket.application.ComponentInstantiationListenerCollection$1.notify(ComponentInstantiationListenerCollection.java:38) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.application.ComponentInstantiationListenerCollection$1.notify(ComponentInstantiationListenerCollection.java:34) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.util.listener.ListenerCollection.notify(ListenerCollection.java:80) ~[wicket-util-9.0.0.jar:9.0.0]
at org.apache.wicket.application.ComponentInstantiationListenerCollection.onInstantiation(ComponentInstantiationListenerCollection.java:33) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.Component.<init>(Component.java:682) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.MarkupContainer.<init>(MarkupContainer.java:185) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.markup.html.WebMarkupContainer.<init>(WebMarkupContainer.java:53) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.markup.html.WebMarkupContainer.<init>(WebMarkupContainer.java:45) ~[wicket-core-9.0.0.jar:9.0.0]
at org.apache.wicket.markup.html.panel.Panel.<init>(Panel.java:67) ~[wicket-core-9.0.0.jar:9.0.0]
at com.example.pf4j_wicket_spring.panels.ConfigurationPanel.<init>(ConfigurationPanel.java:25) ~[na:na]
at com.example.pf4j_wicket_spring.MyPlugin.getConfigurationPanel(MyPlugin.java:40) ~[na:na]
at com.example.pages.PluginTestPage.<init>(PluginTestPage.java:30) ~[classes/:na]
... 38 common frames omitted
问题的根源是什么？这是我的设置错误还是 pf4j-spring 的错误？
问候， 史蒂夫