Dbunit爲onSetup拋出NullPointerException（）

我試圖獲得使用dbunit和junit的句柄。這些測試是不涉及數據庫的基本junit測試。儘管如此，這門課在它到達那裏之前失敗了。當調用IDatabaseTester的onSetup()方法時，它會拋出NullPointerException，而不是執行我期望的操作：刪除數據庫，從dataset.xml構建它。Dbunit爲onSetup拋出NullPointerException（）

爲什麼我得到一個空指針異常？

29 public class TestModifyDb 
30 { 
31 
32 private IDatabaseTester dbtester; 
33 
34 @Before 
35 public void setUp() throws Exception 
36 { 
37  dbtester = new JdbcDatabaseTester("com.mysql.jdbc.Driver", 
38          "jdbc:mysql://localhost/cal", 
39          "cal", 
40          "cal"); 
41 
42  IDataSet dataSet = new FlatXmlDataSetBuilder().build(
43   new FileInputStream("src/gps/tasks/task3663/dataset.xml")); 
44 
45  dbtester.onSetup(); 
46 } 
47 
48 @After 
49 public void tearDown() throws Exception 
50 { 
51  dbtester.onTearDown(); 
52 } 
53 
54 @Test(expected=IndexOutOfBoundsException.class) 
55 public void outOfBounds() 
56 { 
57  new ArrayList<Object>().get(1); 
58 } 
59 
60 @Test (expected=IndexOutOfBoundsException.class) 
61 public void elementAt() 
62 { 
63  int[] intArray = new int[10]; 
64  int i = intArray[20]; 
65 } 
66 
67 }

這裏的堆棧跟蹤：

java.lang.NullPointerException 
    at org.dbunit.operation.DeleteAllOperation.execute(DeleteAllOperation.java:92) 
    at org.dbunit.operation.CompositeOperation.execute(CompositeOperation.java:79) 
    at org.dbunit.AbstractDatabaseTester.executeOperation(AbstractDatabaseTester.java:190) 
    at org.dbunit.AbstractDatabaseTester.onSetup(AbstractDatabaseTester.java:103) 
    at gps.tasks.task3663.TestModifyDb.setUp(TestModifyDb.java:45) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) 
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) 
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) 
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27) 
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31) 
    at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79) 
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71) 
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49) 
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) 
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) 
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) 
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) 
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) 
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236) 
    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:467) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

來源

2012-05-16 djeikyb

我懷疑你只是缺少這一行：

dbTester.setDataSet(dataSet);

（intializing dataSet後，但在此之前調用onSetup）

目前你沒有做任何事情dataSet創建後...

來源

2012-05-16 21:15:38

這當然是代碼問題。謝謝！也許我很愚蠢，但作爲一名java /編程新手，加快dbunit的速度一直很難。現在我已經開始工作了，我看到我應該學習的代碼示例是第二個示例：http://www.dbunit.org/howto.html#noextend – djeikyb

Dbunit爲onSetup拋出NullPointerException（）

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