NullPointerException when compiling program

compile the following program:

public class Test {
    void xx() {
    } {}
}

got this:

java.lang.NullPointerException
        at sun.tools.tree.InlineMethodExpression.inlineValue(InlineMethodExpression.java:49)
        at sun.tools.tree.BinaryAssignExpression.inlineValue(BinaryAssignExpression.java:63)
        at sun.tools.tree.BinaryAssignExpression.inline(BinaryAssignExpression.java:59)
        at sun.tools.tree.CommaExpression.inline(CommaExpression.java:72)
        at sun.tools.tree.MethodExpression.inline(MethodExpression.java:387)
        at sun.tools.tree.ExpressionStatement.inline(ExpressionStatement.java:51)
        at sun.tools.tree.CompoundStatement.inline(CompoundStatement.java:65)
        at sun.tools.javac.SourceField.inline(SourceField.java:386)
        at sun.tools.javac.SourceField.code(SourceField.java:450)
        at sun.tools.javac.SourceClass.compileClass(SourceClass.java:850)
        at sun.tools.javac.SourceClass.compile(SourceClass.java:806)
        at sun.tools.javac.Main.compile(Main.java:267)
        at sun.tools.javac.Main.main(Main.java:375)
error: An exception has occurred in the compiler; please file a bug report (###@###.###).
1 error