IllegalAccessError: tried to access class io.vavr.Lambda from class Main$ #2337
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I noticed that this error does not occur with older Scala versions, like |
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Hi, thank you for reporting the issue!
Does the error also occur with Scala 2.13.0-M5? Thanks! |
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Yes, same error with |
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Thank you for your feedback, that helps! Btw - I did not know about I could reproduce the problem but I needed to tweak your scripts a bit: - scalac -d out -classpath (coursier fetch io.vavr:vavr:0.9.3 | paste -s -d:) Main.scala
+ scalac -d out -classpath "$(coursier fetch -p io.vavr:vavr:0.9.3)" Main.scala
- scala -d out -classpath out:(coursier fetch io.vavr:vavr:0.9.3 | paste -s -d:) Main
+ scala -d out -classpath out:"$(coursier fetch -p io.vavr:vavr:0.9.3)" MainI will give you an update the next days... |
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Yes, coursier is quite neat. :) I am using |
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Aha! :) |
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Ok, it runs now on my local machine, using a local build of vavr-0.10.0-SNAPSHOT.
I will re-test it with the final build before release. |
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Update: Sorry, I used the wrong example. It does still not work. object Main {
def main(args: Array[String]): Unit = {
// does work :)
val f: java.util.function.Function[Int, Int] = i => i
// does not work :/
val f2: io.vavr.Function1[Int, Int] = i => i
}
}Error: Maybe this error occurs, because Vavr's Function1 extends j.u.f.Function and scala is confused about that. 🤔 The current SNAPSHOT can be tested here: #!/bin/bash
DEPS=`coursier fetch -r https://oss.sonatype.org/content/repositories/snapshots/ -p io.vavr:vavr:0.10.0-SNAPSHOT`
scalac -d out -classpath $DEPS Main.scala
scala -classpath out:$DEPS Main |
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As you said, it could be that Scala introduced a bug in recent versions regarding creation/handling of Lambda MetaFactories, MethodHandles.Lookup etc - it worked before... It would be interesting to reproduce it with a minimal non-Vavr functional interface. |
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I do some further tests. TesteeI use the following testee, because it failed to compile with Vavr (see above). object Main {
def main(args: Array[String]): Unit = {
val f: test.FI[Int, Int] = i => i
}
}I compile the test the following way (using JDK8 and JDK11): javac -cp . ./test/FI.java
scalac -d out -classpath . Main.scala
scala -classpath out:. Main✅ Extending a functional interfaceA custom Java functional interface (fi) that extends a Java standard lib fi works fine with Scala: // file FI.java
package test;
@FunctionalInterface
public interface FI<T, R> extends java.util.function.Function<T, R> {
@Override
R apply(T t);
}✅ Internally using an auxiliary interface// file FI.java
package test;
@FunctionalInterface
public interface FI<T, R> {
static <T, R> FI<T, R> of(FI<T, R> f) {
return (FI<T, R> & Internal) f;
}
R apply(T t);
}
interface Internal {
}✅ Internally using package private interface// file FI.java
package test;
@FunctionalInterface
public interface FI<T, R> {
static <T, R> FI<T, R> of(FI<T, R> f) {
return (FI<T, R> & Pkgprivate) f;
}
R apply(T t);
}// file Pkgprivate.java
package test;
interface Pkgprivate {
}✅ Serializable functional interface// file FI.java
package test;
@FunctionalInterface
public interface FI<T, R> extends java.io.Serializable {
long serialVersionUID = 1L;
R apply(T t);
} |
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@2m I found a minimal Java-only example and filed a Scala bug: scala/bug#11373 |
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Thank you for getting to the bottom of this!
…On Sat, 19 Jan 2019, 04:45 Daniel Dietrich ***@***.*** wrote:
Closed #2337 <#2337>.
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When using vavr 0.9.3 with Scala 2.12.7 I am getting the following exception:
When trying to run the following code:
I compile and run the code with the following commands:
The compiled class according to javap looks like:
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