@Parameters method is executed before @ClassRule initialization. Could it be the way around?

I have the following problem (using junit 4.11):

    @ClassRule
    public static TemporaryFolder tmp = new TemporaryFolder();
    ...
    @Parameters
    public static Collection<Object[]> data() throws Exception {
        return java.util.Arrays.asList(new Object[][] {
            {0, tmp.getRoot().getPath()}
        });
    }

This results in initializationError

java.lang.IllegalStateException: the temporary folder has not yet been created
    at org.junit.rules.TemporaryFolder.getRoot(TemporaryFolder.java:127)

So seems the @Parameters method is executed before the ClassRule initialization phase which makes scenarios like above one a bit complicated.

[javornikolov]

Current workaround:

    protected static TemporaryFolder initStaticTemp() {
        try {
            return new TemporaryFolder() { { before(); } };
        } catch (Throwable t) {
            throw new RuntimeException(t);
        }
    }

    public static TemporaryFolder tmp = initStaticTemp();

    @AfterClass
    public static cleanup() throws Exception {
        tmp.delete();
    }

It works but it needs that manual cleanup…

[balrajdacha]

I tried something like this…

@RunWith(StepRunner.class) public class LaunchEnv { @ClassRule public static final CustomRunner tempFolder = new CustomRunner();

@Test
public void dummyTest() {
}

}

Call JUnitCore.runClasses(LaunchEnv.class); In the @Parameterized.Parameters method