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Re: [jdt-dev] ECJ bug for inner class method reference deserialization ? 
Hi,
Can you please file a bug under JDT, ie https://bugs.eclipse.org/bugs/enter_bug.cgi?product=JDT - the component is Core. One of us will take a look.

Regards,
Manoj

-----jdt-dev-bounces@xxxxxxxxxxx wrote: -----
To: jdt-dev@xxxxxxxxxxx
From: Laurent Almeras
Sent by: jdt-dev-bounces@xxxxxxxxxxx
Date: 08/17/2020 10:08PM
Subject: [EXTERNAL] [jdt-dev] ECJ bug for inner class method reference deserialization ?

Hi,
I search some insight to confirm an issue with ECJ.
I create a minimal use-case (two classes, ~20 lines) here : https://github.com/igloo-project/issue-lambda-serialization
The issue I encounter is that if I use method reference notation (ClassName::new) as a Supplier<ClassName>, this lambda triggers a deserialization issue. If I use an inlined expression - () -> new ClassName() - it works as expected. This error is triggered only if code is compiled by Eclipse. The same code, launched with mvn clean test or mvn clean exec:java does not trigger an error.
The not-expected stacktrace is :
Exception in thread "main" java.io.IOException: unexpected exception type
    at java.base/java.io.ObjectStreamClass.throwMiscException(ObjectStreamClass.java:1641)
    at java.base/java.io.ObjectStreamClass.invokeReadResolve(ObjectStreamClass.java:1271)
    at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2153)
    at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1646)
    at java.base/java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2412)
    at java.base/java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2306)
    at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2144)
    at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1646)
    at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:464)
    at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:422)
    at lambda.MySerializer.serializeAndDeserialize(MySerializer.java:33)
    at lambda.MySerializer.main(MySerializer.java:17)
Caused by: java.lang.reflect.InvocationTargetException
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at java.base/java.lang.invoke.SerializedLambda.readResolve(SerializedLambda.java:237)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at java.base/java.io.ObjectStreamClass.invokeReadResolve(ObjectStreamClass.java:1265)
    ... 10 more
Caused by: java.lang.BootstrapMethodError: bootstrap method initialization exception
    at java.base/java.lang.invoke.BootstrapMethodInvoker.invoke(BootstrapMethodInvoker.java:194)
    at java.base/java.lang.invoke.CallSite.makeSite(CallSite.java:307)
    at java.base/java.lang.invoke.MethodHandleNatives.linkCallSiteImpl(MethodHandleNatives.java:258)
    at java.base/java.lang.invoke.MethodHandleNatives.linkCallSite(MethodHandleNatives.java:248)
    at lambda.MyOuterClass.$deserializeLambda$(MyOuterClass.java:1)
    ... 20 more
Caused by: java.lang.invoke.LambdaConversionException: Incorrect number of parameters for static method newInvokeSpecial lambda.MyOuterClass$MyInnerClass.<init>:(MyOuterClass)void; 0 captured parameters, 0 functional interface method parameters, 1 implementation parameters
    at java.base/java.lang.invoke.AbstractValidatingLambdaMetafactory.validateMetafactoryArgs(AbstractValidatingLambdaMetafactory.java:214)
    at java.base/java.lang.invoke.LambdaMetafactory.altMetafactory(LambdaMetafactory.java:503)
    at java.base/java.lang.invoke.BootstrapMethodInvoker.invoke(BootstrapMethodInvoker.java:138)
    ... 24 more

This commit contains all the remaining information about the issue (commands, class names, ...) : https://github.com/igloo-project/issue-lambda-serialization/commit/7b18c2d48833e7e1507115dd778ca1c3f40fd035
I do not find any bug that matches this issue in Eclipse Bugzilla (https://bugs.eclipse.org/bugs/buglist.cgi?bug_status=__open__&content=LambdaConversionException&no_redirect=1&order=Importance&query_format=specific returns 4 other bugs ; the only one that could be linked from my opinion is https://bugs.eclipse.org/bugs/show_bug.cgi?id=565787, but it is not serialization-related).
Anyone can confirm my issue with my minimal test-case ? Where this issue should be created ? Product JDT, Component Core ?


Thanks for you insight,


--
Laurent Almeras




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