异常报错汇总2--java.lang.Exception: Method basicSelect() should be void

java.lang.Exception: Method basicSelect() should be void

	at org.junit.runners.model.FrameworkMethod.validatePublicVoid(FrameworkMethod.java:99)
	at org.junit.runners.model.FrameworkMethod.validatePublicVoidNoArg(FrameworkMethod.java:74)
	at org.junit.runners.ParentRunner.validatePublicVoidNoArgMethods(ParentRunner.java:155)
	at org.junit.runners.BlockJUnit4ClassRunner.validateTestMethods(BlockJUnit4ClassRunner.java:208)
	at org.junit.runners.BlockJUnit4ClassRunner.validateInstanceMethods(BlockJUnit4ClassRunner.java:188)
	at org.junit.runners.BlockJUnit4ClassRunner.collectInitializationErrors(BlockJUnit4ClassRunner.java:128)
	at org.junit.runners.ParentRunner.validate(ParentRunner.java:416)
	at org.junit.runners.ParentRunner.(ParentRunner.java:84)
	at org.junit.runners.BlockJUnit4ClassRunner.(BlockJUnit4ClassRunner.java:65)
	at org.junit.internal.builders.JUnit4Builder.runnerForClass(JUnit4Builder.java:10)
	at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
	at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)
	at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
	at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:33)
	at org.junit.internal.requests.FilterRequest.getRunner(FilterRequest.java:36)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:49)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

@test 注解的方法需要返回值为void

    @Test
    public CustomersEntity basicSelect() {
        CustomersEntity customersEntity=null;
        Connection connection = null;
        PreparedStatement preparedStatement=null;
        ResultSet resultSet=null;
        try {
//      1 获取连接
            connection = getConnection();
//      2 编写sql语句
            String sql = "SELECT id,'name','email',birth FROM customers WHERE id=?";
//      3 预编译sql语句，返回preparedStatement对象
            preparedStatement= connection.prepareStatement(sql);
//      4 占位符填充
            preparedStatement.setObject(1, 10);
//      5 执行preparedStatement 返回结果集
            resultSet = preparedStatement.executeQuery();
//      6 从结果集中取出结果
//        next():判断结果集的下一条是否有数据，如果有数据返回true,并指针下移；如果返回false,指针不会下移。
            if (resultSet.next()) {
                int id = resultSet.getInt("id");
                String name = resultSet.getString("name");
                String email = resultSet.getString("email");
                Date birth = resultSet.getDate("birth");
                customersEntity = new CustomersEntity(id, name, email, birth);
            }
            return customersEntity;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            closeResource(connection, preparedStatement,resultSet);
        }

        return null;
    }

修正：返回值改为空，或者去掉该注解即可

  public CustomersEntity basicSelect() {
        CustomersEntity customersEntity=null;
        Connection connection = null;
        PreparedStatement preparedStatement=null;
        ResultSet resultSet=null;
        try {
//      1 获取连接
            connection = getConnection();
//      2 编写sql语句
            String sql = "SELECT id,'name','email',birth FROM customers WHERE id=?";
//      3 预编译sql语句，返回preparedStatement对象
            preparedStatement= connection.prepareStatement(sql);
//      4 占位符填充
            preparedStatement.setObject(1, 10);
//      5 执行preparedStatement 返回结果集
            resultSet = preparedStatement.executeQuery();
//      6 从结果集中取出结果
//        next():判断结果集的下一条是否有数据，如果有数据返回true,并指针下移；如果返回false,指针不会下移。
            if (resultSet.next()) {
                int id = resultSet.getInt("id");
                String name = resultSet.getString("name");
                String email = resultSet.getString("email");
                Date birth = resultSet.getDate("birth");
                customersEntity = new CustomersEntity(id, name, email, birth);
            }
            return customersEntity;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            closeResource(connection, preparedStatement,resultSet);
        }

        return null;
    }