[Demonstration 1]

[Buggy Method]
@Test
public void should_get_existing_entry_from_cache() {
    given(mockCache.get(SOME_KEY)).willReturn(new ICache.Entry(SOME_BYTES));
    given(mockDataMapper.fromBytes(any(byte[].class), eq(SomeEntry.class))).willReturn(mockEntry);
    ObservableCacheDispatcher cacheDispatcher = new ObservableCacheDispatcher(mockCache, mockDataMapper);
    Observable<SomeEntry> observable = cacheDispatcher.get(SOME_KEY, SomeEntry.class, mockLoader, mockExpiration);
    SomeEntry result = (SomeEntry) observable.toBlocking().first();
    verify(mockLoader, never()).invoke();
    verify(mockCache).get(SOME_KEY);
    verify(mockCache, never()).put(anyString(), any(ICache.Entry.class));
    verify(mockDataMapper).fromBytes(any(byte[].class), eq(SomeEntry.class));
    verify(mockDataMapper, never()).toBytes(anyObject());
    assertThat(result, is(equalTo(mockEntry)));
}

[Buggy Hunk]
SomeEntry result = (SomeEntry) observable.toBlocking().first();

[Patch]
SomeEntry result = observable.toBlocking().first();

[Demonstration 2]

[Buggy Method]
@Test
public void ComponentTypeGetTest() {
    app.Session mockSession = mock(app.Session.class);
    mockSession.role = Role.Staff;
    when(req.getAttribute(app.Session.ATTRIBUTE_NAME)).thenReturn(mockSession);
    ComponentType mockct = mock(ComponentType.class);
    when(ctDAO.findById(1)).thenReturn(mockct);
    ComponentType ct = ComponentTypeController.getComponentType(1, req, res);
    verify(ctDAO, times(1)).findById(1);
    assertEquals(ct, mockct);
}

[Buggy Hunk]
verify(ctDAO, times(1)).findById(1);

[Patch]
verify(ctDAO, times(2)).findById(1);

[Demonstration 3]

[Buggy Method]
@Override
public boolean configure(StaplerRequest sr, JSONObject formData) throws FormException {
    endpoint = sr.getParameter("mattermostEndpoint");
    room = sr.getParameter("mattermostRoom");
    icon = sr.getParameter("mattermostIcon");
    buildServerUrl = sr.getParameter("mattermostBuildServerUrl");
    sendAs = sr.getParameter("mattermostSendAs");
    if (buildServerUrl == null || buildServerUrl == "") {
        JenkinsLocationConfiguration jenkinsConfig = new JenkinsLocationConfiguration();
        buildServerUrl = jenkinsConfig.getUrl();
    }
    if (buildServerUrl != null && !buildServerUrl.endsWith("/")) {
        buildServerUrl = buildServerUrl + "/";
    }
    save();
    return super.configure(sr, formData);
}

[Buggy Hunk]
if(buildServerUrl == null || buildServerUrl == "") {

[Patch]
if(buildServerUrl == null || buildServerUrl.equals("")) {