在实现的方法上获取java.lang.AbstractMethodError

正如标题所述，我得到了一个

java.lang.AbstractMethodError

，该方法由我的类最终实现。完整的错误消息是：

java.lang.AbstractMethodError: htmlexport.HTMLExport.getParameterFormDescriptor()Ljava/util/List;

我有一个定义方法的接口，如下所示：

List<ParamFormElement> getParameterFormDescriptor();

WorkableManager

使用

URLClassLoader

在内部加载包含实现类的jar文件。这很好，我得到了一个实例 所需类别的

定义方法的接口是：

public interface Workable {

    List<ParamFormElement> getParameterFormDescriptor();

}

该接口位于一个单独的项目中，并在本地Maven存储库中组装为一个jar文件。

HTMLExport

类也位于不同的项目中，并且 使用Ant编译和组装。生成的jar文件位于我的主应用程序旁边的一个文件夹中，正如我所说的，加载类是有效的。主要应用 是一个Maven项目，并将接口作为依赖项添加。在Eclipse中，我没有任何错误或警告

stacktrace如下所示：

Root cause:

java.lang.AbstractMethodError: htmlexport.HTMLExport.getParameterFormDescriptor()Ljava/util/List;
    at web.pages.AddJobPage.<init>(AddJobPage.java:30)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:171)
    at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:99)
    at org.apache.wicket.DefaultMapperContext.newPageInstance(DefaultMapperContext.java:137)
    at org.apache.wicket.core.request.handler.PageProvider.resolvePageInstance(PageProvider.java:268)
    at org.apache.wicket.core.request.handler.PageProvider.getPageInstance(PageProvider.java:166)
    at org.apache.wicket.request.handler.render.PageRenderer.getPage(PageRenderer.java:78)
    at org.apache.wicket.request.handler.render.WebPageRenderer.isPageStateless(WebPageRenderer.java:300)
    at org.apache.wicket.request.handler.render.WebPageRenderer.shouldRenderPageAndWriteResponse(WebPageRenderer.java:342)
    at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:203)
    at org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:175)
    at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:837)
    at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
    at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:265)
    at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:222)
    at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:293)
    at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:261)
    at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:203)
    at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:284)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1631)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:549)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:568)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1111)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:478)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1045)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:199)
    at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:109)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
    at org.eclipse.jetty.server.Server.handle(Server.java:462)
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:279)
    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:232)
    at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:534)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:607)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:536)
    at java.lang.Thread.run(Thread.java:722)

Complete stack:

org.apache.wicket.WicketRuntimeException: Can't instantiate page using constructor 'public web.pages.AddJobPage(org.apache.wicket.request.mapper.parameter.PageParameters)' and argument 'workableName=[HTML Export]'. An exception has been thrown during construction!
    at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:194)
    at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:99)
    at org.apache.wicket.DefaultMapperContext.newPageInstance(DefaultMapperContext.java:137)
    at org.apache.wicket.core.request.handler.PageProvider.resolvePageInstance(PageProvider.java:268)
    at org.apache.wicket.core.request.handler.PageProvider.getPageInstance(PageProvider.java:166)
    at org.apache.wicket.request.handler.render.PageRenderer.getPage(PageRenderer.java:78)
    at org.apache.wicket.request.handler.render.WebPageRenderer.isPageStateless(WebPageRenderer.java:300)
    at org.apache.wicket.request.handler.render.WebPageRenderer.shouldRenderPageAndWriteResponse(WebPageRenderer.java:342)
    at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:203)
    at org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:175)
    at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:837)
    at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
    at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:265)
    at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:222)
    at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:293)
    at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:261)

java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:171)
    at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:99)
    at org.apache.wicket.DefaultMapperContext.newPageInstance(DefaultMapperContext.java:137)
    at org.apache.wicket.core.request.handler.PageProvider.resolvePageInstance(PageProvider.java:268)
    at org.apache.wicket.core.request.handler.PageProvider.getPageInstance(PageProvider.java:166)
    at org.apache.wicket.request.handler.render.PageRenderer.getPage(PageRenderer.java:78)
    at org.apache.wicket.request.handler.render.WebPageRenderer.isPageStateless(WebPageRenderer.java:300)
    at org.apache.wicket.request.handler.render.WebPageRenderer.shouldRenderPageAndWriteResponse(WebPageRenderer.java:342)
    at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:203)
    at org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:175)
    at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:837)
    at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
    at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:265)
    at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:222)
    at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:293)
    at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:261)

根本原因： java.lang.AbstractMethodError:htmlexport.htmlexport.getParameterFormDescriptor（）Ljava/util/List； 在web.pages.AddJobPage.（AddJobPage.java:30） 位于sun.reflect.NativeConstructorAccessorImpl.newInstance0（本机方法） 位于java.lang.reflect.Constructor.newInstance（Constructor.java:525） 位于org.apache.wicket.session.DefaultPageFactory.newPage（DefaultPageFactory.java:171） 位于org.apache.wicket.session.DefaultPageFactory.newPage（DefaultPageFactory.java:99） 位于org.apache.wicket.DefaultMapperContext.newPageInstance（DefaultMapperContext.java:137） 位于org.apache.wicket.core.request.handler.PageProvider.resolvePageInstance（PageProvider.java:268） 位于org.apache.wicket.core.request.handler.PageProvider.getPageInstance（PageProvider.java:166） 位于org.apache.wicket.request.handler.render.PageRenderer.getPage（PageRenderer.java:78） 位于org.apache.wicket.request.handler.render.WebPageRender.isPageStateless（WebPageRender.java:300） 位于org.apache.wicket.request.handler.render.WebPageRenderer.shouldRenderPageAndWriterResponse（WebPageRenderer.java:342） 位于org.apache.wicket.request.handler.render.webagerenderer.respond（webagerenderer.java:203） 位于org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond（RenderPageRequestHandler.java:175） 位于org.apache.wicket.request.cycle.RequestCycle$handleExecutor.respond（RequestCycle.java:837） 位于org.apache.wicket.request.RequestHandlerStack.execute（RequestHandlerStack.java:64） 位于org.apache.wicket.request.cycle.RequestCycle.execute（RequestCycle.java:265） 位于org.apache.wicket.request.cycle.RequestCycle.processRequest（RequestCycle.java:222） 位于org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach（RequestCycle.java:293） 位于org.apache.wicket.protocol.http.WicketFilter.processRequestCycle（WicketFilter.java:261） 位于org.apache.wicket.protocol.http.WicketFilter.processRequest（WicketFilter.java:203） http.WicketFilter.doFilter（WicketFilter.java:284） 位于org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter（ServletHandler.java:1631） 位于org.eclipse.jetty.servlet.ServletHandler.doHandle（ServletHandler.java:549） 位于org.eclipse.jetty.server.handler.ScopedHandler.handle（ScopedHandler.java:143） 位于org.eclipse.jetty.security.SecurityHandler.handle（SecurityHandler.java:568） 位于org.eclipse.jetty.server.session.SessionHandler.doHandle（SessionHandler.java:221） 位于org.eclipse.jetty.server.handler.ContextHandler.doHandle（ContextHandler.java:1111） 位于org.eclipse.jetty.servlet.ServletHandler.doScope（ServletHandler.java:478） 位于org.eclipse.jetty.server.session.SessionHandler.doScope（SessionHandler.java:183） 位于org.eclipse.jetty.server.handler.ContextHandler.doScope（ContextHandler.java:1045） 位于org.eclipse.jetty.server.handler.ScopedHandler.handle（ScopedHandler.java:141） 位于org.eclipse.jetty.server.handler.ContextHandlerCollection.handle（ContextHandlerCollection.java:199） 位于org.eclipse.jetty.server.handler.HandlerCollection.handle（HandlerCollection.java:109） 位于org.eclipse.jetty.server.handler.HandlerWrapper.handle（HandlerWrapper.java:97） 位于org.eclipse.jetty.server.server.handle（server.java:462） 位于org.eclipse.jetty.server.HttpChannel.handle（HttpChannel.java:279） 位于org.eclipse.jetty.server.HttpConnection.onFillable（HttpConnection.java:232） 位于org.eclipse.jetty.io.AbstractConnection$2.run（AbstractConnection.java:534） 位于org.eclipse.jetty.util.thread.QueuedThreadPool.runJob（QueuedThreadPool.java:607） 位于org.eclipse.jetty.util.thread.QueuedThreadPool$3.run（QueuedThreadPool.java:536） 运行（Thread.java:722） 完整堆栈： org.apache.wicket.WicketRuntimeException:无法使用构造函数“public web.pages.AddJobPage（org.apache.wicket.request.mapper.parameter.PageParameters）”和参数“workableName=[HTML导出]”实例化页面。在构造过程中引发了异常！ 位于org.apache.wicket.session.DefaultPageFactory.newPage（DefaultPageFactory.java:194） 位于org.apache.wicket.session.DefaultPageFactory.newPage（DefaultPageFactory.java:99） 位于org.apache.wicket.DefaultMapperContext.newPageInstance（DefaultMapperContext.java:137） 位于org.apache.wicket.core.request.handler.PageProvider.resolvePageInstance（PageProvider.java:268） 位于org.apache.wicket.core.request.handler.PageProvider.getPageInstance（PageProvider.java:166） 位于org.apache.wicket.request.handler.render.PageRenderer.getPage（PageRenderer.java:78） 位于org.apache.wicket.request.handler.render.WebPageRender.isPageStateless（WebPageRender.java:300） 位于org.apache.wicket.request.handler.render.WebPageRenderer.shouldRenderPageAndWriterResponse（WebPageRenderer.java:342） 位于org.apache.wicket.request.handler.render.webagerenderer.respond（webagerenderer.java:203） 在org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond（R

public class HTMLExport implements Module {

    @Override
    public final List<ParamFormElement> getParameterFormDescriptor() {
        final List<ParamFormElement> form = new ArrayList<>();
        form.add(new ParamFormElement(ParamFormElement.Type.TEXT, "Bitte eingeben:", "test"));
        return form;
    }

}

Root cause:

java.lang.AbstractMethodError: htmlexport.HTMLExport.getParameterFormDescriptor()Ljava/util/List;
    at web.pages.AddJobPage.<init>(AddJobPage.java:30)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:171)
    at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:99)
    at org.apache.wicket.DefaultMapperContext.newPageInstance(DefaultMapperContext.java:137)
    at org.apache.wicket.core.request.handler.PageProvider.resolvePageInstance(PageProvider.java:268)
    at org.apache.wicket.core.request.handler.PageProvider.getPageInstance(PageProvider.java:166)
    at org.apache.wicket.request.handler.render.PageRenderer.getPage(PageRenderer.java:78)
    at org.apache.wicket.request.handler.render.WebPageRenderer.isPageStateless(WebPageRenderer.java:300)
    at org.apache.wicket.request.handler.render.WebPageRenderer.shouldRenderPageAndWriteResponse(WebPageRenderer.java:342)
    at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:203)
    at org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:175)
    at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:837)
    at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
    at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:265)
    at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:222)
    at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:293)
    at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:261)
    at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:203)
    at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:284)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1631)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:549)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:568)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1111)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:478)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1045)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:199)
    at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:109)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
    at org.eclipse.jetty.server.Server.handle(Server.java:462)
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:279)
    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:232)
    at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:534)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:607)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:536)
    at java.lang.Thread.run(Thread.java:722)

Complete stack:

org.apache.wicket.WicketRuntimeException: Can't instantiate page using constructor 'public web.pages.AddJobPage(org.apache.wicket.request.mapper.parameter.PageParameters)' and argument 'workableName=[HTML Export]'. An exception has been thrown during construction!
    at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:194)
    at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:99)
    at org.apache.wicket.DefaultMapperContext.newPageInstance(DefaultMapperContext.java:137)
    at org.apache.wicket.core.request.handler.PageProvider.resolvePageInstance(PageProvider.java:268)
    at org.apache.wicket.core.request.handler.PageProvider.getPageInstance(PageProvider.java:166)
    at org.apache.wicket.request.handler.render.PageRenderer.getPage(PageRenderer.java:78)
    at org.apache.wicket.request.handler.render.WebPageRenderer.isPageStateless(WebPageRenderer.java:300)
    at org.apache.wicket.request.handler.render.WebPageRenderer.shouldRenderPageAndWriteResponse(WebPageRenderer.java:342)
    at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:203)
    at org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:175)
    at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:837)
    at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
    at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:265)
    at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:222)
    at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:293)
    at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:261)

java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:171)
    at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:99)
    at org.apache.wicket.DefaultMapperContext.newPageInstance(DefaultMapperContext.java:137)
    at org.apache.wicket.core.request.handler.PageProvider.resolvePageInstance(PageProvider.java:268)
    at org.apache.wicket.core.request.handler.PageProvider.getPageInstance(PageProvider.java:166)
    at org.apache.wicket.request.handler.render.PageRenderer.getPage(PageRenderer.java:78)
    at org.apache.wicket.request.handler.render.WebPageRenderer.isPageStateless(WebPageRenderer.java:300)
    at org.apache.wicket.request.handler.render.WebPageRenderer.shouldRenderPageAndWriteResponse(WebPageRenderer.java:342)
    at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:203)
    at org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:175)
    at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:837)
    at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
    at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:265)
    at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:222)
    at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:293)
    at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:261)

    YourInterfaceName obj = (YourInterfaceName)Class.forName
("yourPackageName.YourInterfaceImplClassName").newInstance();

mvn clean install -U