Java zk中的Listbox空指针异常
目前我正在尝试编写一个不使用ZUL文件的测试用例。我有一个非常基本的函数,下面几行 类初始化列表框:Java zk中的Listbox空指针异常,java,listbox,zk,Java,Listbox,Zk,目前我正在尝试编写一个不使用ZUL文件的测试用例。我有一个非常基本的函数,下面几行 类初始化列表框: public class TestComposer { public void listboxTest(){ ListModelList model = new ListModelList(); Listbox lbOne = new Listbox(); lbOne.setModel(model); lbOne.set
public class TestComposer {
public void listboxTest(){
ListModelList model = new ListModelList();
Listbox lbOne = new Listbox();
lbOne.setModel(model);
lbOne.setMultiple(true);
System.out.println(lbOne);
System.out.println(model);
}
}
测试用例
public class testSuit {
static ZatsEnvironment env;
@BeforeClass
public static void init() {
System.out.println("Setting server space.");
env = new DefaultZatsEnvironment("/main/webapp/WEB-INF");
env.init("/main/webapp");
}
@AfterClass
public static void end() {
env.destroy();
}
@After
public void after() {
env.cleanup();
}
@Test
public void test() {
TestComposer tc = new TestComposer();
tc.listboxTest();
}
}
这段代码将产生一个空指针异常。这表明lbOne是空的。有没有一种不用调用/使用ZUL文件就可以使用listbox的方法
堆栈跟踪:
java.lang.NullPointerException at
org.zkoss.zk.ui.event.Events.postEvent(Events.java:383) at
org.zkoss.zk.ui.event.Events.postEvent(Events.java:432) at
org.zkoss.zk.ui.event.Events.postEvent(Events.java:366) at
org.zkoss.zul.Listbox.postOnInitRender(Listbox.java:2501) at
org.zkoss.zul.Listbox.setModel(Listbox.java:2266) at
test.TestComposer.listboxTest(TestComposer.java:12) at
test.testSuit.test(testSuit.java:75) at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at
java.lang.reflect.Method.invoke(Unknown Source) at
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47) at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44) at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27) at
org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271) at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70) at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at
org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) at
org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) at
org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) at
org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) at
org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) at
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26) at
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27) at
org.junit.runners.ParentRunner.run(ParentRunner.java:309) at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675) at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
NPE错误的行/跟踪
test.TestComposer.listboxTest(TestComposer.java:12) at test.testSuit.test(testSuit.java:75) at
lbOne.setModel(model);
PS:我正在使用ZKWeb框架。我使用的测试工具无法捕获zats模拟环境中的痕迹。因此,我想直接调用这些方法,而不依赖ZUL文件。使用此策略如何:
public void listboxTest(){
ListModelList model = new ListModelList();
Listbox lbOne = new Listbox();
lbOne.setModel(model);
lbOne.setMultiple(true);
System.out.println(lbOne);
System.out.println(model);
}
TestComposer
应该扩展SelectorComposer
。请阅读非常奇怪的是,第一次打印显示的是
null
,因为前一行lbOne.setModel(model)代码>应该抛出一个NPE@AlexGreg,很抱歉给你添麻烦。你是对的。它在扔一个NPE。我修改了代码样本谢谢你的回答。但是,它给出了同样的错误。奇怪..你能发布完整的堆栈跟踪吗?我已经用所有的代码和堆栈跟踪更新了这个问题。ThanksZK版本6.0。我正试图为那个特定的项目分析一些东西。我正在做一个测试项目。