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我有一个方法连接到DB并获取所有用户的用户名和密码。我将该方法传递给TestNG @DataProvider，因此@Test可以使用它。使用TestNG @DataProvider时，它返回“[实用程序] [错误] [错误] java.lang.NullPointerException”当调用一个方法（），返回对象[] []
摘要看起来像这样
public class testing2 {
@Test(dataProvider = "dp")
public void f(String userName, String password) {
System.out.println(userName);
System.out.println(password);
}
//Option 1 : Won't work
//Will return [Utils] [ERROR] [Error] java.lang.NullPointerException
@DataProvider
public Object[][] dp() throws ClassNotFoundException, SQLException {
//Creating an instance from the class where the method is located and then calling that method credentials
Object[][] data = instance_of_the_class.method_to_fetch_datas_from_DB();
return data;
//Option 2 : works fine
@DataProvider
public Object[][] dp() throws ClassNotFoundException, SQLException {
//Put the logic directly here without calling any method
//Logic ...
//Logic ...
//Logic ...
//End result is Object[][] data
return data;详细方法如下所示
public Object[][] credentials(String driverClass,
String DBuserName, String DBpassword, String jdbcAddress,
String company1, String company2)
throws ClassNotFoundException, SQLException {
Class.forName(driverClass);
Connection con = DriverManager.getConnection(jdbcAddress, DBuserName, DBpassword);
Statement s = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
ResultSet rs = s
.executeQuery("select * from users where COMPANYID = " + company1 + "or COMPANYID = " + company2);
int total = 0;
while (rs.next() == true) {
total++;
}
Object[][] data = new Object[total][2];
rs.beforeFirst();
int a = 0;
while (rs.next()) {
data[a][0] = rs.getString("USERNAME");
data[a][1] = rs.getString("PASSWD");
a++;
System.out.println(rs.getString("USERNAME"));
}
return data;
}我测试吨他的方法分开，它工作正常。
现在在我的主要测试类中，我开始使用这种方法。它看起来像这样
public class testing2 {
\t
@Test(dataProvider = "dp")
public void f(String userName, String password) {
\t System.out.println(userName);
\t System.out.println(password);
}
@DataProvider
public Object[][] dp() throws ClassNotFoundException, SQLException {
//Creating an instance from the class where method credentials() is located and then calling that method credentials
\t Object[][] data =searching.credentials("interbase.interclient.Driver", "DBuserName", "DBpassword", "jdbc:interbase://10.110.10.10:3050/e:/Databases/DATABASE.IB", "5204", "5201");
\t return data;当我运行它时，它抛出我
[Utils] [ERROR] [Error] java.lang.NullPointerException
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at ssdPage.SSDSearchPage.credentials(SSDSearchPage.java:52)
at ssdTest.SSDtest.getData(SSDtest.java:106)
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.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:108)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:55)
at org.testng.internal.MethodInvocationHelper.invokeMethodNoCheckedException(MethodInvocationHelper.java:45)
at org.testng.internal.MethodInvocationHelper.invokeDataProvider(MethodInvocationHelper.java:115)
at org.testng.internal.Parameters.handleParameters(Parameters.java:509)
at org.testng.internal.Invoker.handleParameters(Invoker.java:1308)
at org.testng.internal.Invoker.createParameters(Invoker.java:1036)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1126)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:126)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
at org.testng.TestRunner.privateRun(TestRunner.java:744)
at org.testng.TestRunner.run(TestRunner.java:602)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:380)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:375)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:340)
at org.testng.SuiteRunner.run(SuiteRunner.java:289)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1301)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1226)
at org.testng.TestNG.runSuites(TestNG.java:1144)
at org.testng.TestNG.run(TestNG.java:1115)
at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:230)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:76)
但是，如果我不调用方法凭证（），但我只是把逻辑直接在@DataProvider中，它工作正常。该代码例子看起来像这样
public class testing2 {
@Test(dataProvider = "dp")
public void f(String userName, String password) {
System.out.println(userName);
System.out.println(password);
}
@DataProvider
public Object[][] dp() throws ClassNotFoundException, SQLException {
Class.forName("interbase.interclient.Driver");
Connection con = DriverManager.getConnection("jdbc:interbase://10.110.10.10:3050/e:/Databases/DATABASE.IB", "DBuserName", "DBpassword");
Statement s = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
ResultSet rs = s
.executeQuery("select * from users where COMPANYID = " + "5204" + "or COMPANYID = " + "5201");
int total = 0;
while (rs.next() == true) {
total++;
}
Object[][] data = new Object[total][2];
rs.beforeFirst();
int a = 0;
while (rs.next()) {
data[a][0] = rs.getString("USERNAME");
data[a][1] = rs.getString("PASSWD");
a++;
System.out.println(rs.getString("USERNAME"));
}
return data;
}
}为什么我不能调用TestNG中@dataProvider返回Object [][]的方法？ 为什么逻辑必须直接写入@DataProvider？
谢谢。
你必须找到NPE在哪里以及为什么。 – juherr
谢谢@juherr，我已经添加了完整的异常消息，但对我来说没有多大帮助。 – keylogger