Mockito and PowerMock MethodNotFoundException being thrown

Question

Running into the below error when using Powermockito and Mockito to build some simple unit tests for a connection pool I made that wraps around Hikari CP. The setup of the tests are below. What is confusing to me is I have a whole handful of unit tests that are not shown and they all pass using the same setup and methods. Just this one unit test continues to fail with that error. And it doesn't matter what when statement I put at the top, they all can't find the method.

org.powermock.reflect.exceptions.MethodNotFoundException: No methods matching the name(s) getColumnCount were found in the class hierarchy of class java.lang.Object.

at org.powermock.reflect.internal.WhiteboxImpl.getMethods(WhiteboxImpl.java:1720)
at org.powermock.reflect.internal.WhiteboxImpl.getMethods(WhiteboxImpl.java:1745)
at org.powermock.reflect.internal.WhiteboxImpl.getBestMethodCandidate(WhiteboxImpl.java:983)
at org.powermock.core.MockGateway$MockInvocation.findMethodToInvoke(MockGateway.java:317)
at org.powermock.core.MockGateway$MockInvocation.init(MockGateway.java:356)
at org.powermock.core.MockGateway$MockInvocation.<init>(MockGateway.java:307)
at org.powermock.core.MockGateway.doMethodCall(MockGateway.java:142)
at org.powermock.core.MockGateway.methodCall(MockGateway.java:125)
at com.datafiniti.utils.mysqlconnpool.MysqlConnPoolTests.executeStringQuery(MysqlConnPoolTests.java:149)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:68)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:316)
at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:89)
at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:97)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:300)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:131)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.access$100(PowerMockJUnit47RunnerDelegateImpl.java:59)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner$TestExecutorStatement.evaluate(PowerMockJUnit47RunnerDelegateImpl.java:147)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.evaluateStatement(PowerMockJUnit47RunnerDelegateImpl.java:107)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTest(PowerMockJUnit47RunnerDelegateImpl.java:82)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:288)
at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:87)
at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:50)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:208)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:147)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:121)
at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:34)
at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:44)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:123)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:121)
at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53)
at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:59)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:117)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:262)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:84)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

Here is the unit tests:

@RunWith(PowerMockRunner.class)
public class MysqlConnPoolTests {

private HikariConfig mockHikariConfig;
private HikariDataSource hikariDataSource;

@Before
@PrepareForTest({HikariConfig.class, HikariDataSource.class})
public void beforEachTest() throws Exception {

    // mock the hikari confic used within the connection pool
    mockHikariConfig = PowerMockito.mock(HikariConfig.class);

    // mock hikari config constructor
    PowerMockito.whenNew(HikariConfig.class)
            .withNoArguments()
            .thenReturn(mockHikariConfig);

    // mock hikari config data source setting
    PowerMockito.doNothing().when(mockHikariConfig)
            .setDataSourceClassName("com.mysql.jdbc.jdbc2.optional.MysqlDataSource");

    // mock the hikari data source used within the connection pool
    hikariDataSource = PowerMockito.mock(HikariDataSource.class);

    // mock hikari data source constructor
    PowerMockito.whenNew(HikariDataSource.class)
            .withParameterTypes(HikariConfig.class)
            .withArguments(Mockito.isA(HikariConfig.class))
            .thenReturn(hikariDataSource);
}

@Test
@PrepareForTest({MysqlConnectionPool.class, Connection.class, Statement.class, ResultSet.class, ResultSetMetaData.class})
public void executeStringQuery() throws Exception {
    PowerMockito.spy(MysqlConnectionPool.class);

    Connection mockConnection = Mockito.mock(Connection.class);
    Statement mockStatement = Mockito.mock(Statement.class);
    ResultSet mockResultSet = Mockito.mock(ResultSet.class);
    ResultSetMetaData mockMeta = Mockito.mock(ResultSetMetaData.class);

    Mockito.when(mockMeta.getColumnCount()).thenReturn(1);
    Mockito.when(mockMeta.getColumnLabel(1)).thenReturn("foo");

    Mockito.when(mockResultSet.first()).thenReturn(true);
    Mockito.when(mockResultSet.next()).thenReturn(false);
    Mockito.when(mockResultSet.getString(1)).thenReturn("bar");

    Mockito.when(mockStatement.execute(Mockito.eq("SELECT * FROM table;"))).thenReturn(true);
    Mockito.when(mockStatement.getResultSet()).thenReturn(mockResultSet);

    Mockito.when(mockConnection.createStatement()).thenReturn(mockStatement);

    Mockito.when(hikariDataSource.getConnection()).thenReturn(mockConnection);

    MysqlConnectionPool pool = new MysqlConnectionPool().create();
    List<Map<String, String>> result = pool.executeQuery("SELECT * FROM table;");

    assertEquals(1, result.size());
    assertTrue(result.get(0).containsKey("foo"));
    assertEquals("bar", result.get(0).get("foo"));
}

}

Answer 1

Going to post an answer just in case someone else sees this. Reverting all versions to 1.6.5 solved the problem.