FULL PRODUCT VERSION :
java version "1.5.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-b64)
Java HotSpot(TM) Client VM (build 1.5.0-b64, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
The compiler crashes when compiling this code:

public class GenericsBug {
  
  static <T> void varargs(T...args){
    for(T t : args)
      System.out.println(t);
  }
  
  public static void main(String[]args){
    varargs(new int[]{1, 2, 3}, new int[]{4, 5, 6});
  }
  
}


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Just try to compile the code

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Since the method:
static <T> void varargs(T...args)
should be translated by the compiler to:
static void varargs(Object...args)
and arrays are objects then this code should compile, otherwise the compiler should report an error, but not crash!!
ACTUAL -
An exception has occurred in the compiler (1.5.0). 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: unexpected type: <nulltype>
at com.sun.tools.javac.tree.TreeMaker.Type(TreeMaker.java:531)
at com.sun.tools.javac.tree.TreeMaker.Type(TreeMaker.java:525)
at com.sun.tools.javac.comp.Lower.boxArgs(Lower.java:2529)
at com.sun.tools.javac.comp.Lower.visitApply(Lower.java:2439)
at com.sun.tools.javac.tree.Tree$Apply.accept(Tree.java:819)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:1893)
at com.sun.tools.javac.tree.TreeTranslator.visitExec(TreeTranslator.java:227)
at com.sun.tools.javac.tree.Tree$Exec.accept(Tree.java:734)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:1893)
at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:54)
at com.sun.tools.javac.tree.TreeTranslator.visitBlock(TreeTranslator.java:145)
at com.sun.tools.javac.comp.Lower.visitBlock(Lower.java:2950)
at com.sun.tools.javac.tree.Tree$Block.accept(Tree.java:540)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:1893)
at com.sun.tools.javac.tree.TreeTranslator.visitMethodDef(TreeTranslator.java:129)
at com.sun.tools.javac.comp.Lower.visitMethodDefInternal(Lower.java:2287)
at com.sun.tools.javac.comp.Lower.visitMethodDef(Lower.java:2206)
at com.sun.tools.javac.tree.Tree$MethodDef.accept(Tree.java:482)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:1893)
at com.sun.tools.javac.comp.Lower.visitClassDef(Lower.java:2001)
at com.sun.tools.javac.tree.Tree$ClassDef.accept(Tree.java:438)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:1893)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:1913)
at com.sun.tools.javac.comp.Lower.translateTopLevelClass(Lower.java:3087)
at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:462)
at com.sun.tools.javac.main.Main.compile(Main.java:592)
at com.sun.tools.javac.main.Main.compile(Main.java:544)
at com.sun.tools.javac.Main.compile(Main.java:58)
at com.sun.tools.javac.Main.main(Main.java:48)


ERROR MESSAGES/STACK TRACES THAT OCCUR :
An exception has occurred in the compiler (1.5.0). 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: unexpected type: <nulltype>
at com.sun.tools.javac.tree.TreeMaker.Type(TreeMaker.java:531)
at com.sun.tools.javac.tree.TreeMaker.Type(TreeMaker.java:525)
at com.sun.tools.javac.comp.Lower.boxArgs(Lower.java:2529)
at com.sun.tools.javac.comp.Lower.visitApply(Lower.java:2439)
at com.sun.tools.javac.tree.Tree$Apply.accept(Tree.java:819)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:1893)
at com.sun.tools.javac.tree.TreeTranslator.visitExec(TreeTranslator.java:227)
at com.sun.tools.javac.tree.Tree$Exec.accept(Tree.java:734)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:1893)
at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:54)
at com.sun.tools.javac.tree.TreeTranslator.visitBlock(TreeTranslator.java:145)
at com.sun.tools.javac.comp.Lower.visitBlock(Lower.java:2950)
at com.sun.tools.javac.tree.Tree$Block.accept(Tree.java:540)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:1893)
at com.sun.tools.javac.tree.TreeTranslator.visitMethodDef(TreeTranslator.java:129)
at com.sun.tools.javac.comp.Lower.visitMethodDefInternal(Lower.java:2287)
at com.sun.tools.javac.comp.Lower.visitMethodDef(Lower.java:2206)
at com.sun.tools.javac.tree.Tree$MethodDef.accept(Tree.java:482)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:1893)
at com.sun.tools.javac.comp.Lower.visitClassDef(Lower.java:2001)
at com.sun.tools.javac.tree.Tree$ClassDef.accept(Tree.java:438)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:1893)
at com.sun.tools.javac.comp.Lower.translate(Lower.java:1913)
at com.sun.tools.javac.comp.Lower.translateTopLevelClass(Lower.java:3087)
at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:462)
at com.sun.tools.javac.main.Main.compile(Main.java:592)
at com.sun.tools.javac.main.Main.compile(Main.java:544)
at com.sun.tools.javac.Main.compile(Main.java:58)
at com.sun.tools.javac.Main.main(Main.java:48)


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class GenericsBug {
  
  static <T> void varargs(T...args){
    for(T t : args)
      System.out.println(t);
  }
  
  public static void main(String[]args){
    varargs(new int[]{1, 2, 3}, new int[]{4, 5, 6});
  }
  
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
I don't have any, but not to use varargs
Hint: When I used the Integer wrapper, it woked, i.e,
varargs(new Integer[]{1, 2, 3}, new Integer[]{4, 5, 6});
instead of:
varargs(new int[]{1, 2, 3}, new int[]{4, 5, 6});
###@###.### 2005-1-28 06:42:25 GMT