Scala on Android: java.lang.NoSuchMethodError: java.lang.String.isEmpty

Question

I am getting following Exception on Android 2.2.1:

java.lang.NoSuchMethodError: java.lang.String.isEmpty

I am calling text.isEmpty from Scala. Any idea, how to solve this?

Backcross

check this post #7568265 – Glanders

Answer 1

Use JRE/JDK 1.5, which did not have an isEmpty method on String. This will avoid situations where Scala uses 1.6's isEmpty instead of its own. If you have Java libraries as well, be sure to pick ones compatible with 1.5.

Adhesive

Answer 2

java.lang.String.isEmpty() was added in Gingerbread (2.3). You will have to write your own replacement function...

Frilling

I am compiling against 2.2 and compiler compiles that. It finds isEmpty implementation in IndexedSeqOptimized.isEmpty. – Backcross

That's some Scala weirdism. The Android API in your question definitely didn't appear until Gingerbread. See that developer.android.com/reference/java/lang/String.html#isEmpty() says "Since API Level 9" – Frilling

Yes, but I think it should use the implementation from the trait IndexedSeqOptimized. The question is, why it is not using this trait? – Backcross

Answer 3

Alternativly use (text.length()>0) ?

Narcose

Yes, I am using now text.length == 0. – Backcross

Answer 4

Use TextUtils.isEmpty() instead, available since API level 1.

Headgear