Uwe Schindler created LUCENE-6920:
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Summary: Simplify callable function checks in Expression module
Key: LUCENE-6920
URL: https://issues.apache.org/jira/browse/LUCENE-6920
Project: Lucene - Core
Issue Type: Improvement
Components: modules/expressions
Reporter: Uwe Schindler
Assignee: Uwe Schindler
Fix For: Trunk, 5.5
The expressions module allows to specify custom functions. It does some checks
to ensure that the compiled Expression works correctly and does not produce
linkage errors. It also checks parameters and return type to be doubles.
There are two problems with the current approach:
- the check gets classloaders of the method's declaring class. This fails if a
security manager forbids access to bootstrap classes (e.g., java.lang.Math)
- the code only checks if method or declaring class are public, but not if it
is really reachable. This may not be the case in Java 9 (different module
without exports,...)
This issue will use MethodHandles to do the accessibility checks (it uses
MethodHandles.publicLookup() to resolve the given reflected method). If that
fails, our compiled code cannot acess it. If module system prevents access,
this is also checked.
To fix the issue with classloaders, it uses a trick: It calls Class.forName()
with the classloader we use to compile our expression. If that does not return
the same class as the declared method, it also fails compilation. This prevents
NoClassDefFoundException on executing the expression.
All tests pass.
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