Getting crash when using this library

[AndroidDeveloperLB]

implementation 'com.googlecode.ez-vcard:ez-vcard:0.10.5'

It could be because of updated dependencies, but I keep getting crashes even for the simple case of:

    StructuredName n = new StructuredName();
    n.setFamily("Doe");
    n.setGiven("Jonathan");
    n.getPrefixes().add("Mr");
    vcard.setStructuredName(n);
    vcard.setFormattedName("John Doe");
    String str = Ezvcard.write(vcard).version(VCardVersion.V4_0).go();

And of course when using VCardWriter:

        final File vcfFile = new File(path);
        vCardWriter = new VCardWriter(vcfFile, VCardVersion.V3_0);
        final VCard vCard = new VCard();
        vCard.addFormattedName(new FormattedName(displayName));
        vCardWriter.write(vCard);

The crash log:

 Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.io.Reader.read(char[])' on a null object reference
    at java.util.Properties$LineReader.readLine(Properties.java:434)
    at java.util.Properties.load0(Properties.java:349)
    at java.util.Properties.load(Properties.java:337)
    at ezvcard.Ezvcard.<clinit>(Ezvcard.java:127)
    at ezvcard.Ezvcard.write(Ezvcard.java:470) 

Any idea how to fix it?

Tested on Pixel 2 with Android 10, but I've noticed it occurs for users too, of various types of devices and Android versions.

[AndroidDeveloperLB]

Seems it doesn't occur with the previous version we've used:

implementation 'com.googlecode.ez-vcard:ez-vcard:0.10.2'

And also a newer one:

implementation 'com.googlecode.ez-vcard:ez-vcard:0.10.4'

Only on 0.10.5

[mangstadt]

The static initializer of the Ezvcard class reads data from a properties file, which is located at the root of the classpath. It appears that your environment does not have this properties file for some reason.

Someone recently reported a similar issue. He said something about "proguard minify enabled" causing the problem.

[AndroidDeveloperLB]

It's not Proguard, because this occurs on debug mode too.
Please explain how to fix this.

[mangstadt]

Create a package in your project named "ezvcard" and put a file called "ez-vcard.properties" in it. Populate the file with the following content:

version=0.10.5
groupId=com.googlecode.ez-vcard
artifactId=ez-vcard
url=http://github.com/mangstadt/ez-vcard

[AndroidDeveloperLB]

I don't understand. This seems like the dependency we already have on gradle. What is this for?

[mangstadt]

The groupId and artifactId properties are only used in certain situations with JSON-encoded vCards. If you leave them out, it shouldn't hurt anything else.

[AndroidDeveloperLB]

@mangstadt Sorry but I don't understand your solution. This is what I use:

implementation 'com.googlecode.ez-vcard:ez-vcard:0.10.4'

And if I update it to 0.10.5, the issue appears.
What do you suggest to change here?

[mangstadt]

Does the ez-vcard JAR file that your project uses contain a ezvcard/ez-vcard.properties file? If that file is missing, then it would cause the error you are seeing. I checked the JAR file that's hosted on Maven Central and it's not missing the file.

The only other thing I can think of is: Does the Class.getResourceAsStream method behave differently on Android than it does in Java? If it does, that might be causing the problem.

[AndroidDeveloperLB]

We use the repository directly via gradle. No jar file.
When we use 0.10.4 version and I search for the "ez-vcard.properties" file, I find this:

If I update to 0.10.5, I find a similar result:

As for "getResourceAsStream" , what is the use case for you to use it? I think it's not recommended to use it on Android, as it has its own way to handle resources, no?

---

EDIT: Hmmm... That's odd. I've updated to this version and tried again running the app. And now it works...
Maybe it's an issue with some of Google SDK stuff (Gradle plugin...), not building the project correctly.

Need to do further checking.

[AndroidDeveloperLB]

Closing this for now as I don't see the issue anymore.