Make sure class without a package, like the ones PowerMock creates ar…

…e working (close #343)

core/src/main/java/org/easymock/internal/ClassProxyFactory.java

@@ -203,18 +203,19 @@ public <T> T createProxy(final Class<T> toMock, InvocationHandler handler,
 
     private String classPackage(Class<?> toMock) {
         // We want to create the mock in the same class as the original class when the class is in default scope
-        if (isJdkClass(toMock)) {
+        if (isJdkClassOrWithoutPackage(toMock)) {
             return "org.easymock.mocks.";
         }
         return  toMock.getPackage().getName() + ".";
     }
 
     private <T> ClassLoader classLoader(Class<T> toMock) {
-        return isJdkClass(toMock) ? getClass().getClassLoader() : toMock.getClassLoader();
+        return isJdkClassOrWithoutPackage(toMock) ? getClass().getClassLoader() : toMock.getClassLoader();
     }
 
-    private static <T> boolean isJdkClass(Class<T> toMock) {
-        return toMock.getPackage().getName().startsWith("java.");
+    private static <T> boolean isJdkClassOrWithoutPackage(Class<T> toMock) {
+        Package aPackage = toMock.getPackage();
+        return aPackage == null || aPackage.getName().startsWith("java."); // we need to verify for null since some dynamic classes have no package
     }
 
     private ClassLoadingStrategy<ClassLoader> classLoadingStrategy() {

test-integration/src/test/java/org/itests/PowermockTest.java

@@ -22,8 +22,11 @@
 import org.powermock.core.classloader.annotations.PrepareForTest;
 import org.powermock.modules.junit4.PowerMockRunner;
 
+import java.net.URL;
+
 import static org.easymock.EasyMock.expect;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
 import static org.junit.Assert.fail;
 import static org.powermock.api.easymock.PowerMock.*;
 
@@ -72,5 +75,10 @@ public void mockType() {
         assertEquals(getClass(), EasyMockSupport.getMockedClass(mock));
     }
 
+    @Test
+    public void mockJDK() {
+        Object mock = PowerMock.createMock(URL.class);
+        assertNull(mock.getClass().getPackage()); // the mock will have no package and we expect EasyMock to not crash
+    }
 }