FULL PRODUCT VERSION :


A DESCRIPTION OF THE PROBLEM :
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.NullPointerException
	at com.sun.tools.javac.comp.Lower.visitStringSwitch(Lower.java:3456)
	at com.sun.tools.javac.comp.Lower.visitSwitch(Lower.java:3357)
	at com.sun.tools.javac.tree.JCTree$JCSwitch.accept(JCTree.java:959)
	at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
	at com.sun.tools.javac.comp.Lower.translate(Lower.java:2160)
	at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)
	at com.sun.tools.javac.tree.TreeTranslator.visitBlock(TreeTranslator.java:160)
	at com.sun.tools.javac.comp.Lower.visitBlock(Lower.java:3311)
	at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:781)
	at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
	at com.sun.tools.javac.comp.Lower.translate(Lower.java:2160)
	at com.sun.tools.javac.tree.TreeTranslator.visitMethodDef(TreeTranslator.java:144)
	at com.sun.tools.javac.comp.Lower.visitMethodDefInternal(Lower.java:2619)
	at com.sun.tools.javac.comp.Lower.visitMethodDef(Lower.java:2538)
	at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:669)
	at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
	at com.sun.tools.javac.comp.Lower.translate(Lower.java:2160)
	at com.sun.tools.javac.comp.Lower.visitClassDef(Lower.java:2283)
	at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:591)
	at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
	at com.sun.tools.javac.comp.Lower.translate(Lower.java:2160)
	at com.sun.tools.javac.comp.Lower.translate(Lower.java:2180)
	at com.sun.tools.javac.comp.Lower.translateTopLevelClass(Lower.java:3650)
	at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1393)
	at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1271)
	at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:870)
	at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:829)
	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)

REGRESSION.  Last worked in version 7

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
import java.util. Scanner;
public class question2 {
	public static void main(String [] args){
		Scanner kb = new Scanner(System.in);
			double num1;
			double num2;
			System.out.println("Enter s for area of a square");
					System.out.println("Enter t for area of a triangle");
						String input1 = kb.next();
						switch (input1){
							case ("s"):
								System.out.println("Please enter the side of the square:");
								num1 = kb.nextDouble();
								num1 = Math.pow(num1,2);
										System.out.println("The area of the square you entered = " + num1);
										break;
							case ("t"):
								System.out.println("Please enter the base of the triangle");
									System.out.print("Base = ");
										num1= kb.nextDouble();
								System.out.print("\n Hight = ");
									num2=kb.nextDouble();
									double num3 = .5 * num1* num2;
								System.out.println("\n The area of the triangle you entered = " + num3);
									break;
									default:
								System.out.println("Input is not correct");

												}
	}
}


REPRODUCIBILITY :
This bug can be reproduced always.