Better error message when "org.testng.internal.reflect.MethodMatcherException: Data provider mismat

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It collects links to all the places you might be looking at while hunting down a tough bug.<br/></p><p class="_description_9cepa_87 _strongText_9cepa_146">And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.</p><button class="_btnHero_9cepa_111">Talk to a Lightrun Answers expert</button></div></div></div></div></astro-island><section class="sectionWrapper _issueSummary_1slku_1"><div class="_container_riqi3_1"><div class="_wrapper_1slku_6"><h1 class="_title_1slku_11">Better error message when "org.testng.internal.reflect.MethodMatcherException: Data provider mismatch "</h1><a href="https://github.com/cbeust/testng/issues/1031" class="_linkUnderline_1slku_16">See original GitHub issue</a></div><div class="_wrapperGrid_1slku_66"><div class="_descriptionWrapper_1slku_31"><div class="_wrapper_1otsw_1 _textContainer_1slku_36 "><div class="_content_1otsw_23"><div><p><strong>This is what I am sending through my data provider</strong></p> <pre><code class="language-java">@DataProvider(name="test") public static Object[][] test() throws Exception{ return new Object[][] {"","hemanth","sridhar","test123","test123","address1","address2","Topeka","Kansas","66601","1234567890","Super User","","Please enter Email Address."} <p><strong>This is my signature</strong></p> <pre><code class="language-java">@Test(groups={"regression"},dataProvider="excelSheetDataRead",dataProviderClass=SearchData.class) public void TC_PA_008_TC_PA_009_TC_PA_010_TC_PA_011_TC_PA_012_TC_PA_013_TC_PA_014_TC_PA_015_TC_PA_016_TC_A_017_TC_PA_018_TC_PA_019_TC_PA_020_TC_PA_021_TC_PA_022_errorScenarios(String emailId,String firstName, String lastName, String password, String confirmPassword,String address1, String address2, String city, String state, String zipCode,String phoneNumber,String roleAssignment,String faxNumber,String website,String expectedErrorMsg) throws Exception <p><strong>Complete console log</strong>:</p> <pre><code>org.testng.internal.reflect.MethodMatcherException: Data provider mismatch Method: TC_PA_008_TC_PA_009_TC_PA_010__TC_PA_011_TC_PA_012_TC_PA_013_TC_PA_014_TC_PA_015_TC_PA_016_TC_A_017_TC_PA_018_TC_PA_019_TC_PA_020_TC_PA_021_TC_PA_022_errorScenarios([Parameter{index=0, type=java.lang.String, declaredAnnotations=[]}, Parameter{index=1, type=java.lang.String, declaredAnnotations=[]}, Parameter{index=2, type=java.lang.String, declaredAnnotations=[]}, Parameter{index=3, type=java.lang.String, declaredAnnotations=[]}, Parameter{index=4, type=java.lang.String, declaredAnnotations=[]}, Parameter{index=5, type=java.lang.String, declaredAnnotations=[]}, Parameter{index=6, type=java.lang.String, declaredAnnotations=[]}, Parameter{index=7, type=java.lang.String, declaredAnnotations=[]}, Parameter{index=8, type=java.lang.String, declaredAnnotations=[]}, Parameter{index=9, type=java.lang.String, declaredAnnotations=[]}, Parameter{index=10, type=java.lang.String, declaredAnnotations=[]}, Parameter{index=11, type=java.lang.String, declaredAnnotations=[]}, Parameter{index=12, type=java.lang.String, declaredAnnotations=[]}, Parameter{index=13, type=java.lang.String, declaredAnnotations=[]}, Parameter{index=14, type=java.lang.String, declaredAnnotations=[]}]) Arguments: [(java.lang.String),(java.lang.String)hemanth,(java.lang.String)sridhar,(java.lang.String)test123,(java.lang.String)test123,(java.lang.String)address1,(java.lang.String)address2,(java.lang.String)Topeka,(java.lang.String)Kansas,(java.lang.String)66601,(java.lang.String)1234567890,(java.lang.String)Super User,(java.lang.String),(java.lang.String)Please enter Email Address.] at org.testng.internal.reflect.DataProviderMethodMatcher.getConformingArguments(DataProviderMethodMatcher.java:52) at org.testng.internal.Invoker.injectParameters(Invoker.java:1228) at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1125) at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:129) at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:112) at org.testng.TestRunner.privateRun(TestRunner.java:778) at org.testng.TestRunner.run(TestRunner.java:632) at org.testng.SuiteRunner.runTest(SuiteRunner.java:366) at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:361) at org.testng.SuiteRunner.privateRun(SuiteRunner.java:319) at org.testng.SuiteRunner.run(SuiteRunner.java:268) at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52) at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86) at org.testng.TestNG.runSuitesSequentially(TestNG.java:1225) at org.testng.TestNG.runSuitesLocally(TestNG.java:1150) at org.testng.TestNG.runSuites(TestNG.java:1075) at org.testng.TestNG.run(TestNG.java:1047) at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:126) at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:137) at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:58) </div></div></div></div><div class="_descriptionWrapper_1slku_31"><h3>Issue Analytics</h3><ul class="_analyticsWrapper_1slku_83"><li><span class="_boldTitle_1slku_98">State:</span><img src="/answers/_astro/open_icon.7e0c1050.svg" alt="open"/></li><li>Created 7 years ago</li><li><span class="_boldTitle_1slku_98">Comments:</span><span>13</span></li></ul></div></div></div></section><section class="sectionWrapper _topResultsSection_1fyzj_1"><div class="_container_riqi3_1"><div class="_wrapper_1fyzj_8"><section class="_commentsSection_ywxhf_1"><h4 class="_title_11519_1 "><img src="/answers/_astro/github_icon.a38d9f88.webp" alt="github_icon"/>Top GitHub Comments</h4><div class="_commentsContainer_ywxhf_11"><div class="_commentsWrapper_ywxhf_24"><div class="_itemWrapper_ywxhf_30"><div class="_itemHead_ywxhf_38"><div class="_itemReactions_ywxhf_53"><span class="_count_ywxhf_62">1</span><span class="_description_ywxhf_66">reaction</span></div><a href="https://github.com/cbeust/testng/issues/1031#issuecomment-214608426" class="_name_ywxhf_75">juherr</a><span class="_itemTitle_ywxhf_71">commented, Apr 26, 2016</span></div><div class="_wrapper_1otsw_1 _scrollContainer_ywxhf_80"><div class="_content_1otsw_23"><div><p>I think we could be better and be a bit more precise: too much/few parameters. But clearly not a priority 😉</p> </div></div></div></div><div class="_itemWrapper_ywxhf_30"><div class="_itemHead_ywxhf_38"><div class="_itemReactions_ywxhf_53"><span class="_count_ywxhf_62">0</span><span class="_description_ywxhf_66">reactions</span></div><a href="https://github.com/cbeust/testng/issues/1031#issuecomment-1156171258" class="_name_ywxhf_75">krmahadevan</a><span class="_itemTitle_ywxhf_71">commented, Jun 15, 2022</span></div><div class="_wrapper_1otsw_1 _scrollContainer_ywxhf_80"><div class="_content_1otsw_23"><div><p>Following is what I see in TestNG <code>7.6.0</code> (latest released version as of today)</p> <pre><code class="language-java">import org.testng.annotations.DataProvider; import org.testng.annotations.Test; public class TestClass { @Test(dataProvider = "dp") public void testMethod(int a, int b) { @DataProvider(name = "dp") public Object[][] getData() { return new Object[][]{ <p>Error message:</p> <pre><code>org.testng.internal.reflect.MethodMatcherException: