Byteman 4.0.0-BETA0 is now available from the
Byteman downloads page and from the
Maven Central repository.
This
is a preview release allowing Byteman to be used with a JDK9 that
includes the Java Platform Module System (JPMS aka Jigsaw). It
implements basic support for Byteman to operate in a module-enabled JDK
(e.g. Early Access release
b138 for JDK 9 with Project Jigsaw or your own release built from the Jigsaw project
jake tree).
This
release implements one new capability. Byteman rules may now access
members of classes which belong to a named module but are not
exported by that module (or only have limited exports). For example,
the following initialization for BIND variable name will now pass
typecheck:
RULE . . .
. . .
BIND
th = Thread.getCurrentThread();
name = th.name;
. . .
This release will operate as normal on JDK6-8.
On
JDK9 only one issue is
expected: rule compilation will fail when a rule refers to public types
that are not exported by their owning module. For example, the
following initialization for BIND variable u will fail to compile
RULE . . .
. . .
COMPILE
BIND
u = Unsafe.Unsafe();
. . .
There
is no problem invoking the constructor and, indeed, this code will work
if the COMPILE option is switched to NOCOMPILE. However, when the rule
is translated to bytecode the reference to variable u of type Unsafe
leads to a verify error,. Currently bytecode is generated in a class in
the unnamed module and Unsafe, although it is a public class, is not
exported to the unnamed module. This limitation will be addressed in a
later release.
