The following source file:

package open;

import java.lang.annotation.*;
import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;

@Documented @Inherited @Target(TYPE) @Retention(RUNTIME)
public @interface NotificationType {
    String value(); // e.g. "my.notif.type"
    Class userDataClass() default void.class; // e.g. MemoryNotifInfo.class
}

crashes the current compiler (pre-b46):

javac -source 1.5 NotificationType.java

An exception has occurred in the compiler (1.5.0-internal). 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.NullPointerException
at com.sun.tools.javac.code.Types.erasure(Types.java:1722)
at com.sun.tools.javac.code.Symbol$ClassSymbol.erasure(Symbol.java:561)
at com.sun.tools.javac.code.Attribute$Class.makeClassType(Attribute.java:61)
at com.sun.tools.javac.code.Attribute$Class.<init>(Attribute.java:57)
at com.sun.tools.javac.comp.Annotate.enterAttributeValue(Annotate.java:195)
at com.sun.tools.javac.comp.MemberEnter.enterDefaultValue(MemberEnter.java:721)
at com.sun.tools.javac.comp.MemberEnter.access$400(MemberEnter.java:39)
at com.sun.tools.javac.comp.MemberEnter$6.enterAnnotation(MemberEnter.java:709)
at com.sun.tools.javac.comp.Annotate.flush(Annotate.java:92)
at com.sun.tools.javac.comp.Annotate.enterDone(Annotate.java:82)
at com.sun.tools.javac.comp.Enter.main(Enter.java:394)
at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:382)
at com.sun.tools.javac.main.Main.compile(Main.java:586)
at com.sun.tools.javac.main.Main.compile(Main.java:538)
at com.sun.tools.javac.Main.compile(Main.java:44)
at com.sun.tools.javac.Main.main(Main.java:35)

The code compiles if void.class is changed into Void.class.