How to configure log4j.properties for SpringJUnit4ClassRunner?

Question

Suddenly this keeps happening during a JUnit test. Everything was working, I wrote some new tests and this error occured. If I revert it, it won\'t go away. Why is that?

Answer 1

Because I don't like to have duplicate files (log4j.properties in test and main), and I have quite many test classes, they each runwith SpringJUnit4ClassRunner class, so I have to customize it. This is what I use：

import java.io.FileNotFoundException;

import org.junit.runners.model.InitializationError;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.util.Log4jConfigurer;

public class MySpringJUnit4ClassRunner extends SpringJUnit4ClassRunner {

    static {
        String log4jLocation = "classpath:log4j-oops.properties";
        try {
            Log4jConfigurer.initLogging(log4jLocation);
        } catch (FileNotFoundException ex) {
            System.err.println("Cannot Initialize log4j at location: " + log4jLocation);
        }
    }

    public MySpringJUnit4ClassRunner(Class clazz) throws InitializationError {
        super(clazz);
    }
}

When you use it, replace SpringJUnit4ClassRunner with MySpringJUnit4ClassRunner

@RunWith(MySpringJUnit4ClassRunner.class) 
@ContextConfiguration("classpath:conf/applicationContext.xml") 
public class TestOrderController {
    private Logger LOG = LoggerFactory.getLogger(this.getClass());

    private MockMvc mockMvc;
...
}