FULL PRODUCT VERSION :
java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) 64-Bit Server VM (build 21.0-b17, mixed mode)

javac 1.7.0

ADDITIONAL OS VERSION INFORMATION :
Linux 2.6.38-10-generic #46-Ubuntu SMP Tue Jun 28 15:07:17 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
Javac fails with NPE on compiling annotated class where an annotation parameter is a reference to an annotated constant (code example is provided in a Steps to Reproduce section).

REGRESSION. Last worked in version 6u26

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Create a file Sample.java with a following content:
@SuppressWarnings(Holder.S)
public class Sample {
}

class Holder {
  @SuppressWarnings("")
  static final String S = "";
}

2. Invoke "javac Sample.java"

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Compilation passed.
ACTUAL -
Exception occurred.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
An exception has occurred in the compiler (1.7.0). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport) after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report. Thank you.
java.lang.AssertionError: java.lang.NullPointerException
at com.sun.tools.javac.code.Symbol$VarSymbol.getConstValue(Symbol.java:1005)
at com.sun.tools.javac.comp.Attr.checkInit(Attr.java:2627)
at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:2285)
at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1677)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:431)
at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:418)
at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:449)
at com.sun.tools.javac.comp.Annotate.enterAttributeValue(Annotate.java:203)
at com.sun.tools.javac.comp.Annotate.enterAttributeValue(Annotate.java:243)
at com.sun.tools.javac.comp.Annotate.enterAnnotation(Annotate.java:181)
at com.sun.tools.javac.comp.MemberEnter.enterAnnotations(MemberEnter.java:778)
at com.sun.tools.javac.comp.MemberEnter.access$300(MemberEnter.java:56)
at com.sun.tools.javac.comp.MemberEnter$5.enterAnnotation(MemberEnter.java:746)
at com.sun.tools.javac.comp.Annotate.flush(Annotate.java:109)
at com.sun.tools.javac.comp.Annotate.enterDone(Annotate.java:101)
at com.sun.tools.javac.comp.Enter.complete(Enter.java:510)
at com.sun.tools.javac.comp.Enter.main(Enter.java:469)
at com.sun.tools.javac.main.JavaCompiler.enterTrees(JavaCompiler.java:929)
at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:824)
at com.sun.tools.javac.main.Main.compile(Main.java:417)
at com.sun.tools.javac.main.Main.compile(Main.java:331)
at com.sun.tools.javac.main.Main.compile(Main.java:322)
at com.sun.tools.javac.Main.compile(Main.java:76)
at com.sun.tools.javac.Main.main(Main.java:61)
Caused by: java.lang.NullPointerException
at com.sun.tools.javac.code.Lint$AugmentVisitor.augment(Lint.java:290)
at com.sun.tools.javac.code.Lint.augment(Lint.java:82)
at com.sun.tools.javac.comp.Attr.attribLazyConstantValue(Attr.java:597)
at com.sun.tools.javac.code.Symbol$VarSymbol$1.call(Symbol.java:971)
at com.sun.tools.javac.code.Symbol$VarSymbol.getConstValue(Symbol.java:1003)
... 23 more

REPRODUCIBILITY :
This bug can be reproduced always.