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This is a spinner with ArrayAdapter that I pulled from the Android Docs.  I have been doing these spinners a lot with no trouble.
I upgraded to a new OS  osx 10.9.4, and I start getting these errors.  I also have trouble with ADT doing the same thing.
I am running Android Studio 0.8.1.


//==================================================================================
//
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MyActivity$PlaceholderFragment">


    <Spinner
        android:id="@+id/planets_spinner"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="119dp"
        android:entries="@array/planets_array"
        android:layout_alignParentTop="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:background="#ff0c709a"
        android:spinnerMode="dialog" />

    <Spinner
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/spinner02"
        android:layout_below="@+id/planets_spinner"
        android:layout_marginTop="57dp"
        android:layout_alignRight="@+id/planets_spinner"
        android:layout_alignEnd="@+id/planets_spinner"
        android:background="#ff698538"
        android:spinnerMode="dialog" />


</RelativeLayout>


//==================================================================================

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">SPINNER22</string>
    <string name="hello_world">Hello world!</string>
    <string name="action_settings">Settings</string>


    <string-array name="planets_array">
        <item>Mercury</item>
        <item>Venus</item>
        <item>Earth</item>
        <item>Mars</item>
        <item>Jupiter</item>
        <item>Saturn</item>
        <item>Uranus</item>
        <item>Neptune</item>
    </string-array>


</resources>


//==================================================================================

package com.techlatin.vyoumans.spinner22;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;
import android.widget.ArrayAdapter;
import android.widget.Spinner;


public class MyActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my);

        Spinner spinner = (Spinner) findViewById(R.id.spinner02);

// Create an ArrayAdapter using the string array and a default spinner layout
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
                R.array.planets_array, android.R.layout.simple_spinner_item);


// Specify the layout to use when the list of choices appears
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

// Apply the adapter to the spinner
        spinner.setAdapter(adapter);


        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.container, new PlaceholderFragment())
                    .commit();
        }
    }


//==================================================================================
07-03 21:29:59.684  29135-29135/com.techlatin.vyoumans.spinner22 D/dalvikvm﹕ Late-enabling CheckJNI
07-03 21:29:59.910  29135-29135/com.techlatin.vyoumans.spinner22 D/libEGL﹕ loaded /vendor/lib/egl/libEGL_POWERVR_SGX540_120.so
07-03 21:29:59.918  29135-29135/com.techlatin.vyoumans.spinner22 D/libEGL﹕ loaded /vendor/lib/egl/libGLESv1_CM_POWERVR_SGX540_120.so
07-03 21:29:59.918  29135-29135/com.techlatin.vyoumans.spinner22 D/libEGL﹕ loaded /vendor/lib/egl/libGLESv2_POWERVR_SGX540_120.so
07-03 21:29:59.996  29135-29135/com.techlatin.vyoumans.spinner22 D/OpenGLRenderer﹕ Enabling debug mode 0
07-03 22:04:01.403  29135-29138/com.techlatin.vyoumans.spinner22 D/dalvikvm﹕ GC_CONCURRENT freed 139K, 2% free 8879K/9048K, paused 2ms+6ms, total 36ms
07-03 22:06:41.465  29878-29878/com.techlatin.vyoumans.spinner22 D/dalvikvm﹕ Late-enabling CheckJNI
07-03 22:06:41.613  29878-29878/com.techlatin.vyoumans.spinner22 D/AndroidRuntime﹕ Shutting down VM
07-03 22:06:41.613  29878-29878/com.techlatin.vyoumans.spinner22 W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x40e2d930)
07-03 22:06:41.613  29878-29878/com.techlatin.vyoumans.spinner22 E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.techlatin.vyoumans.spinner22/com.techlatin.vyoumans.spinner22.MyActivity}: java.lang.NullPointerException
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
            at android.app.ActivityThread.access$600(ActivityThread.java:141)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5041)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.NullPointerException
            at com.techlatin.vyoumans.spinner22.MyActivity.onCreate(MyActivity.java:35)
            at android.app.Activity.performCreate(Activity.java:5104)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
            at android.app.ActivityThread.access$600(ActivityThread.java:141)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5041)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
            at dalvik.system.NativeStart.main(Native Method)