For some reason the gradle build gets stuck at task
:hibernate-core:compileTestJava when using OpenJDK 11.0.3.
I can't reproduce the problem with 11.0.9, though, so it's probably a
bug in OpenJDK 11.0.3.
Signed-off-by: Yoann Rodière <yoann@hibernate.org>
This test accesses a field of an entity directly and expects it to be
automatically initialized; this cannot work without extended bytecode
enhancement.
This used to work with Java 8 bytecode, but only by chance. It seems
that Java 8 bytecode relies on "synthetic", static access methods
inserted by the compiler to access the fields of entities in this test:
any access to the field is done through this access method instead of
through a direct field access. Since we apply bytecode enhancement to
all methods of entities, this means that access to fields triggers
initialization, without any bytecode enhancement in the caller class.
I believe this is specific to nested classes, but couldn't find a
source. For reference, the bytecode of access methods looks like this:
static int access$002(org.hibernate.test.bytecode.enhancement.lazy.NaturalIdInUninitializedAssociationTest$AnEntity, int);
Code:
0: aload_0
1: iload_1
2: dup_x1
3: putfield #3 // Field id:I
6: ireturn
static org.hibernate.test.bytecode.enhancement.lazy.NaturalIdInUninitializedAssociationTest$EntityImmutableNaturalId access$102(org.hibernate.test.bytecode.enhancement.lazy.NaturalIdInUninitializedAssociationTest$AnEntity, org.hibernate.test.bytecode.enhancement.lazy.NaturalIdInUninitializedAssociationTest$EntityImmutableNaturalId);
Code:
0: aload_0
1: aload_1
2: dup_x1
3: putfield #2 // Field entityImmutableNaturalId:Lorg/hibernate/test/bytecode/enhancement/lazy/NaturalIdInUninitializedAssociationTest$EntityImmutableNaturalId;
6: areturn
With Java 11, however, access to fields of entities is done directly,
even for nested classes. So the access methods no longer exist, and we
don't get automatic initialization upon field access. We need extended
bytecode enhancement, like we would in any other case of field access
(in particular accessing fields of non-nested classes).
It's no longer necessary since we upgraded to byte-buddy 1.10.2,
and it causes bytecode to be converted from Java 14 to Java 12 in some
cases (I don't know why).
Yoann Rodière
Hibernate-CI
Sanne Grinovero
Christian Beikov
Jan-Willem Gmelig Meyling
jiangHZ
Yanming Zhou
Erin Schnabel
Andrea Boriero
Luke Chen
Michael Edgar
nicklas.wallgren
info@kawoolutions.com