Lambda and multi-catch

[Remi Forax]

A colleague of mine have find a hairy bug,
here is a simple code to reproduce it.

import java.io.IOException;

public class FunWithMultiCatch {
   public static void main(String[] args) {
     Runnable r = () -> {
       try {
         Object o = null;
         o.getClass();
         throw new IOException();
       } catch(IOException | IllegalArgumentException e) {
         System.out.println("KO !");
       } catch(RuntimeException e) {
         System.out.println("OK !");
       }
     };
     r.run();
   }
}

It prints 'KO !' :(
The problem can be reproduced for any multi-catch inside a lambda,
the exception table is clearly wrong, the IOException and IAE are merged
to their common supertype (java.lang.Exception).

private static void lambda$main$0();
     Code:
        0: aconst_null
        ...
       14: athrow
       15: astore_0
       16: getstatic     #8                  // Field 
java/lang/System.out:Ljava/io/PrintStream;
       19: ldc           #9                  // String OK !
       21: invokevirtual #10                 // Method 
java/io/PrintStream.println:(Ljava/lang/String;)V
       24: goto          36
       27: astore_0
       28: getstatic     #8                  // Field 
java/lang/System.out:Ljava/io/PrintStream;
       31: ldc           #12                 // String KO !
       33: invokevirtual #10                 // Method 
java/io/PrintStream.println:(Ljava/lang/String;)V
       36: return
     Exception table:
        from    to  target type
            0    15    15   Class 
java/lang/Exception                            <------------ Oops
            0    15    27   Class java/lang/RuntimeException

The current workaround is to not use a multi-catch in a lambda.

It seems that some version of Eclipse had the same issue but it's fixed 
with the one I use (from 21 feb).

cheers,
Rémi