Question

当我在我的控制器（zk）中设置单个模型时，一切都很好，但是当我尝试为多个模型执行此操作时，我有错误java.lang.NullPointerException。我的错误是什么？代码......

public void doAfterCompose (Component comp) throws Exception {
    super.doAfterCompose(comp);

    // set models and render to listbox after composed
    articuloListBox.setModel(getArticulosModel());
    articuloListBox.setItemRenderer(new ArticulosRenderer());

    // Setting this second model the error is trow....
    try {
        familiaListBox.setModel(getFamiliasModel());
        familiaListBox.setItemRenderer(new FamiliasRenderer());
    } catch (Exception e) {
        System.out.println("EXCEPTION: "+e);
    }
}

这是完整的堆栈跟踪...

Grave：java.lang.NullPointerException at controllers.ArticulosViewController.doAfterCompose（ArticulosViewController.java:89）在 org.zkoss.zk.ui.impl.UiEngineImpl.doAfterCompose（UiEngineImpl.java:529）在 org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0（UiEngineImpl.java:824）在 org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild（UiEngineImpl.java:770）在 org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0（UiEngineImpl.java:679）在 org.zkoss.zk.ui.impl.UiEngineImpl.execCreate（UiEngineImpl.java:643）在 org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0（UiEngineImpl.java:394）在 org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage（UiEngineImpl.java:316）在 org.zkoss.zk.ui.http.DHtmlLayoutServlet.process（DHtmlLayoutServlet.java:215）在 org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet（DHtmlLayoutServlet.java:135）在javax.servlet.http.HttpServlet.service（HttpServlet.java:687）at javax.servlet.http.HttpServlet.service（HttpServlet.java:790）at at org.apache.catalina.core.StandardWrapper.service（StandardWrapper.java:1682）在 org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:318）在 org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:160）在 org.apache.catalina.core.StandardPipeline.doInvoke（StandardPipeline.java:734）在 org.apache.catalina.core.StandardPipeline.invoke（StandardPipeline.java:673）在com.sun.enterprise.web.WebPipeline.invoke（WebPipeline.java:99）at org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:174）在 org.apache.catalina.connector.CoyoteAdapter.doService（CoyoteAdapter.java:415）在 org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:282）在 com.sun.enterprise.v3.services.impl.ContainerMapper $ HttpHandlerCallable.call（ContainerMapper.java:459）在 com.sun.enterprise.v3.services.impl.ContainerMapper.service（ContainerMapper.java:167）在 org.glassfish.grizzly.http.server.HttpHandler.runService（HttpHandler.java:201）在 org.glassfish.grizzly.http.server.HttpHandler.doHandle（HttpHandler.java:175）在 org.glassfish.grizzly.http.server.HttpServerFilter.handleRead（HttpServerFilter.java:235）在 org.glassfish.grizzly.filterchain.ExecutorResolver $ 9.execute（ExecutorResolver.java:119）在 org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter（DefaultFilterChain.java:284）在 org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart（DefaultFilterChain.java:201）在 org.glassfish.grizzly.filterchain.DefaultFilterChain.execute（DefaultFilterChain.java:133）在 org.glassfish.grizzly.filterchain.DefaultFilterChain.process（DefaultFilterChain.java:112）在 org.glassfish.grizzly.ProcessorExecutor.execute（ProcessorExecutor.java:77）在 org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent（TCPNIOTransport.java:561）在 org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent（AbstractIOStrategy.java:112）在 org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0（WorkerThreadIOStrategy.java:117）在 org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access $ 100（WorkerThreadIOStrategy.java:56）在 org.glassfish.grizzly.strategies.WorkerThreadIOStrategy $ WorkerThreadRunnable.run（WorkerThreadIOStrategy.java:137）在 org.glassfish.grizzly.threadpool.AbstractThreadPool $ Worker.doWork（AbstractThreadPool.java:565）在 org.glassfish.grizzly.threadpool.AbstractThreadPool $ Worker.run（AbstractThreadPool.java:545）在java.lang.Thread.run（Thread.java:745）

NullPointerException尝试设置两个模型zk

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