Mittwoch, 17. Mai 2017

Where are the ear or war files stored in a jboss container?

I was searching where jboss stores an ear or war files once you deployed it via the cli cmd line. Here is my finding on that:

  • The uploaded war or ear ist stored within a file called $jboss.server.base.dir/standalone/data/content/xx/xxyyyyyyyyy/content
  • xx is a two char directory name within the default data folder
  • yyyyyyyyyyy is a hash value of your ear or war
  • You will find the xxyyyyyyy key as the sha1 value of your deployed ear or war within your standalone.xml config under the deployment section
Within the $jboss.server.base.dir/standalone/tmp you might find the cache of our currently running jboss. If you delete tmp after stopping jboss it will reinstall the ingredients from data. If you delete data you are screwed and you have to remove the ear or war entries from your standalone.xml or start jboss with --admin-only to redeploy the war or ears with the console.


Dienstag, 7. März 2017

Take care when using @Injectmocks

Well @Injectmocks is nice and evil in one tag. Assume we have this service 

@Service
public class SampleService {
    private final Logger LOG = Logger.getLogger(SampleService.class.getName());

    @Autowired
    private SampleDependency1   dependency1;

    public Long sampleMethod() {
        LOG.info("Calling sampleMethod");
        Long l = dependency1.calculateValue();
        LOG.info("l = " + l);
        return  l;
    }
}
and the corresponding test
@RunWith(SpringRunner.class)
@SpringBootTest
public class InjectmocksApplicationTests {
    @Mock
    private SampleDependency1 dependency1;

    @InjectMocks
    private SampleService service = new SampleService();

    @Test
    public void contextLoads() {
        when(dependency1.calculateValue()).thenReturn(null);
        final Long l = service.sampleMethod();
        Assert.isNull(l, "well l should be null");
    }
}

Ok, should work and will call our service with the injected mock for dependency1. Now lets add a second dependency like this:
@Service
public class SampleService {
    private final Logger LOG = Logger.getLogger(SampleService.class.getName());

    @Autowired
    private SampleDependency1   dependency1;

    @Autowired
    private SampleDependency2   dependency2;

    public Long sampleMethod() {
        LOG.info("Calling sampleMethod");
        Long l = dependency1.calculateValue();
        l= dependency2.calculateValue();
        LOG.info("l = " + l);
        return  l;
    }
This will compile, but running your test will result in 
java.lang.NullPointerException at net.kambrium.example.SampleService.sampleMethod(SampleService.java:23)
because you forgot to add dependency2 to your test class. To avoid this do
1. Use constructor wiring for your dependencies
2. Use @InjectMocks wisely and go searching on your tests for usage of the service you change and adjust the test cases
I personally prefer 1. as it always starts complaining at compile time. If your are using checkstyle you will see this warning, when using field injection:
Spring Team recommends: "Always use constructor based dependency injection in your beans. Always use assertions for mandatory dependencies"

Freitag, 10. Februar 2017

Renew an Apple distribution certificate for dummies

Year after year you may need to refresh your distribution cert of your iOS app. These few steps are the short list, which should be done to renew an iOS Distribution Certificate for App Store distribution:


  1. Go to developer.apple.com -> Account -> Certificates
  2. Select Certificates->Production-> Add
  3. Choose App Store and Ad Hoc
  4. Open Keychain Access app and select Keychain Access > Certificate Assistant > Request a Certificate from a Certificate Authority as stated in the developer website
  5. Fill out all values and don't forget to select "let me specify key pair information" this will ensure that a private key is specified in your generated cert
  6. Save the cert request
  7. Select continue and choose the saved cert request
  8. This will generate you new distribution cert
  9. Go to provisioning profile and select the one you're using to provision your app
  10. Change the used distribution cert to the one you newly generated
  11. Go back to xcode and refresh your certs within prefs->account
  12. Download the newly generated provisioning profile if not already done

On any other machine you need to get access to the distribution profile including the private key to sign ios application. You need to export the distribution profile from the machine, which generates the profile as a p12 file. Just choose export within the key list and provide a password.
On the second machine you could then open the p12 file provide the password and that imports the dist cert including the private key into your local key store.

Montag, 21. November 2016

Docker cheat sheet

Start docker image and map a port from the docker image to a port on localhost
docker run -p 127.0.0.1:8806:3306 8538c205bee2
Starts image id 8538c205bee2 and maps internal port 3306 of that image to localhost port 8806.

Open a bash in a running docker image
docker exec -it 8538c205bee2 /bin/bash
Stop all running docker images
docker stop $(docker ps -a -q)
Remove/delete all running docker images
docker rm $(docker ps -a -q)

Mittwoch, 16. November 2016

How to browser a remote docker repository

to browse a remote docker repository for available versions of a docker image you could use the docker API like this

curl https://mydockerrepo.de/v2/[IMAGE-NAME]/tags/list


Mittwoch, 27. Juli 2016

Get rid of the google hangout window

I'm using google hangout and chat quite often. Sometimes it happens that the google hangout window opens in a new window instead inside of the google mail window. If that happens just deactivate the google hangout extension in your browser. I.e. chrome do the following


  1. Go to settings->Extensions
  2. Search for Google Hangouts extension
  3. Deactivate it