yWorks / yGuard

yGuard/src/main/java/com/yworks/yshrink/core/Writer.java

Lines 109 to 110 in 00e10b5

    
           ClassDescriptor cd = model.getClassDescriptor( 
        
               entryName.substring( 0, entryName.lastIndexOf( ".class" ) ) );

cd can be null which will cause a null pointer exception and consequently a unhelpful yShrink encountered an unknown problem! diagnostic.

Checking and throwing a more informative exception, with the name of the unmodeled class would help troubleshoot the issue. I have personally encountered this and it's making it hard to understand what I miss configured.

@mendess thanks for opening this ticket. I don't entirely understand how a class that's read from a JAR would become unmodelled inside the shrinker in this scenario. Can you share a test case with us so we can find a concise solution to this problem. All the best

Closing because of missing feedback.

	ClassDescriptor cd = model.getClassDescriptor(
	entryName.substring( 0, entryName.lastIndexOf( ".class" ) ) );

Unknown problem is a null pointer exception caused by a missing null check