Question

I am trying to write a unit test for the following class:

@Transactional
public class EditorHelper {

private static SessionFactory sf;

static {        
    ClassPathResource hbr = new ClassPathResource("hibernate.cfg.xml");
    File hbCfg = null;

    try {
        hbCfg = hbr.getFile();
    } catch (IOException e) {
        e.printStackTrace();
    }
    if (hbCfg != null) {
        sf = new AnnotationConfiguration().configure(hbCfg).buildSessionFactory(); // <-- Stack trace points here
    }
}
public static void setSf(SessionFactory sf) {
    EditorHelper.sf = sf;
}
}

There are some other methods, but this setup code is what’s relevant to my question. In my unit test, I want to mock (using EasyMock) the SessionFactory object sf, as well as the Session and Transaction objects it will return:

public class EditorTest {

    private SessionFactory sf;
    private Session s;
    private Transaction tx;
    private Long id = 1L;
    private String idStr = id.toString();

    @Before
    public void setUp() {

        sf = EasyMock.createMock(SessionFactory.class);
        s = EasyMock.createMock(Session.class);
        tx = EasyMock.createMock(Transaction.class);

        EditorHelper.setSf(sf); // <-- Stack trace points here

        EasyMock.expect(sf.getCurrentSession()).andReturn(s);
        EasyMock.expect(s.beginTransaction()).andReturn(tx);
    }
// Tests go here
}

When I try to run this with JUnit, I get the following error:

java.lang.NoSuchFieldError: INSTANCE
    at org.hibernate.type.BasicTypeRegistry.<init>(BasicTypeRegistry.java:94)
    at org.hibernate.type.TypeResolver.<init>(TypeResolver.java:59)
    at org.hibernate.cfg.Configuration.<init>(Configuration.java:250)
    at org.hibernate.cfg.Configuration.<init>(Configuration.java:302)
    at org.hibernate.cfg.AnnotationConfiguration.<init>(AnnotationConfiguration.java:87)
    at com.mypkg.helper.EditorHelper.<clinit>(EditorHelper.java:38)
    at com.mypkg.model.EditorTest.setUp(EditorTest.java:29)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

There is no public INSTANCE variable on sf that I can see. I’m new to EasyMock, so I think my question is: what should I tell my mock to return for INSTANCE, and how do I tell it to do that? I don’t know why the SessionFactory setup code is being called by setSf() at all, so that’s another mystery. The more general question is: how should I mock up a SessionFactory object anyway?

Update

I figured out that catching the exception without doing anything will work just fine. I have changed my EditorHelper class as follows:

@Transactional
public class EditorHelper {

private static SessionFactory sf;

static {    

...

    if (hbCfg != null) {
        try { // New try block lets the initializaiton fail
            sf = new AnnotationConfiguration().configure(hbCfg).buildSessionFactory();
        } catch (NoSuchFieldError e) {
            e.printStackTrace();
        }
    }
...

Once this static block completes, I can set the SessionFactory member to point to my mock object and everything works from there.

Answer 1

The code is being run because it is inside a static initialization block. Once your test refers to EditorHelper, the JVM will load the class and this initialization block will run and attempt to create a SessionFactory from the AnnotationConfiguration instance which is configured with the config XML file.

Which class are you trying to test? I note that the test is EditorTest and the class is EditorHelper. Is this intentional, and are you actually trying to test an Editor class?