WeightedSumComparator fails when using RouletteWheelSelector

10:50:47.515 [main] ERROR d.e.c.m.Evoal - Main class threw an exception.
java.util.concurrent.CompletionException: java.lang.ClassCastException: class de.evoal.core.main.comparator.WeightedSumOptimisationValue cannot be cast to class java.lang.Number (de.evoal.core.main.comparator.WeightedSumOptimisationValue is in module de.evoal.core.main@0.9.0-SNAPSHOT of loader 'app'; java.lang.Number is in module java.base of loader 'bootstrap')

at 
java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:315)
at 
java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:320)
at 
java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1770)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at 
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at 
java.base/java.lang.Thread.run(Thread.java:833)

Caused by: java.lang.ClassCastException: class de.evoal.core.main.comparator.WeightedSumOptimisationValue cannot be cast to class java.lang.Number (de.evoal.core.main.comparator.WeightedSumOptimisationValue is in module 
de.evoal.core.main@0.9.0-SNAPSHOT of loader 'app'; java.lang.Number is in module java.base of loader 'bootstrap')
at 
io.jenetics.base/io.jenetics.RouletteWheelSelector.fitnessOf(RouletteWheelSelector.java:85)
at 
io.jenetics.base/io.jenetics.RouletteWheelSelector.probabilities(RouletteWheelSelector.java:67)
at 
io.jenetics.base/io.jenetics.ProbabilitySelector.probabilities(ProbabilitySelector.java:153)
at 
io.jenetics.base/io.jenetics.ProbabilitySelector.select(ProbabilitySelector.java:119)
at 
io.jenetics.base/io.jenetics.engine.Engine.selectOffspring(Engine.java:302)
at 
io.jenetics.base/io.jenetics.engine.Engine.lambda$evolve$1(Engine.java:198)
at 
io.jenetics.base/io.jenetics.engine.Timing.timing(Timing.java:58)
at 
io.jenetics.base/io.jenetics.engine.Engine.lambda$evolve$2(Engine.java:197)
at 
java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768)
... 3 common frames omitted

Reported by @ste_jan

added bug confirmed labels

assigned to @berber

changed the description

added doing label

According to Jenetic's source code, the RouletteWheelSelector requires the fitness value to extend Comparable and Number which the WeightedSumOptimisationValue does not do. Therefore, we need a new NumericComparator which has a single number-based optimisation value and make it implement Number as well.

mentioned in commit 5972ac58

The new comparator requires the following addition in core.dl:

/**
 * Comparator for a single number-based fitness value (such as a double).
 */
type 'numeric-comparator' extends comparator {
}

Pipeline 253782 contains the first release with the corresponding implementation.

added testing label and removed doing label

assigned to @ste_jan

@ste_jan I added everything to the repository and committed some changes to your repository. Can you please check it?

closed