java. Lang. internalerror: callersensitive comment expected in frame 1
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Java
In a static method (annotated with @ callersensitive), I try to get the name of the calling class:
@CallerSensitive public static void someMethod() { String name = sun.reflect.Reflection.getCallerClass().getName(); ... }
I received an error:
java.lang.InternalError: CallerSensitive annotation expected at frame 1
What's wrong with that?
reference resources
> http://www.infoq.com/news/2013/07/Oracle-Removes-getCallerClass > http://openjdk.java.net/jeps/176
UPDATE
I am using java 8 (u25) and do not recommend the method getcallerclass () (getcallerclass (int)) as you can see when disassembling bytecode:
$/usr/lib/jvm/java-8-oracle/bin/javap -cp /usr/lib/jvm/java-8-oracle/jre/lib/rt.jar -verbose sun.reflect.Reflection > bytecode
Output (only relevant rows are displayed)
Classfile jar:file:/usr/lib/jvm/jdk1.8.0_25/jre/lib/rt.jar!/sun/reflect/Reflection.class Last modified Sep 17,2014; size 6476 bytes Compiled from "Reflection.java" public class sun.reflect.Reflection minor version: 0 major version: 52 flags: ACC_PUBLIC,ACC_SUPER Constant pool: #78 = Utf8 Lsun/reflect/CallerSensitive; #80 = Utf8 Deprecated #82 = Utf8 Ljava/lang/Deprecated; { public sun.reflect.Reflection(); descriptor: ()V flags: ACC_PUBLIC public static native java.lang.Class<?> getCallerClass(); descriptor: ()Ljava/lang/Class; flags: ACC_PUBLIC,ACC_STATIC,ACC_NATIVE Signature: #76 // ()Ljava/lang/Class<*>; RuntimeVisibleAnnotations: 0: #78() public static native java.lang.Class<?> getCallerClass(int); descriptor: (I)Ljava/lang/Class; flags: ACC_PUBLIC,ACC_NATIVE Deprecated: true Signature: #81 // (I)Ljava/lang/Class<*>; RuntimeVisibleAnnotations: 0: #82()
Solution
Only privileged code can use this annotation
Extracted from the open JDK source file classfileparser cpp
// Privileged code can use all annotations. Other code silently drops some. const bool privileged = loader_data->is_the_null_class_loader_data() || loader_data->is_ext_class_loader_data() || loader_data->is_anonymous();
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