#fixed code
                                @Test
    public void testKnownDecodings() {
        assertEquals("The quick brown fox jumped over the lazy dogs.", new String(Base64
                .decodeBase64("VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wZWQgb3ZlciB0aGUgbGF6eSBkb2dzLg==".getBytes(CHARSET_UTF8))));
        assertEquals("It was the best of times, it was the worst of times.", new String(Base64
                .decodeBase64("SXQgd2FzIHRoZSBiZXN0IG9mIHRpbWVzLCBpdCB3YXMgdGhlIHdvcnN0IG9mIHRpbWVzLg==".getBytes(CHARSET_UTF8))));
        assertEquals("http://jakarta.apache.org/commmons", new String(Base64
                .decodeBase64("aHR0cDovL2pha2FydGEuYXBhY2hlLm9yZy9jb21tbW9ucw==".getBytes(CHARSET_UTF8))));
        assertEquals("AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz", new String(Base64
                .decodeBase64("QWFCYkNjRGRFZUZmR2dIaElpSmpLa0xsTW1Obk9vUHBRcVJyU3NUdFV1VnZXd1h4WXlaeg==".getBytes(CHARSET_UTF8))));
        assertEquals("{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }", new String(Base64.decodeBase64("eyAwLCAxLCAyLCAzLCA0LCA1LCA2LCA3LCA4LCA5IH0="
                .getBytes(CHARSET_UTF8))));
        assertEquals("xyzzy!", new String(Base64.decodeBase64("eHl6enkh".getBytes(CHARSET_UTF8))));
    }
#vulnerable code 
                                @Test
    public void testKnownDecodings() {
        assertEquals("The quick brown fox jumped over the lazy dogs.", new String(Base64
                .decodeBase64("VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wZWQgb3ZlciB0aGUgbGF6eSBkb2dzLg==".getBytes(Charsets.UTF_8))));
        assertEquals("It was the best of times, it was the worst of times.", new String(Base64
                .decodeBase64("SXQgd2FzIHRoZSBiZXN0IG9mIHRpbWVzLCBpdCB3YXMgdGhlIHdvcnN0IG9mIHRpbWVzLg==".getBytes(Charsets.UTF_8))));
        assertEquals("http://jakarta.apache.org/commmons", new String(Base64
                .decodeBase64("aHR0cDovL2pha2FydGEuYXBhY2hlLm9yZy9jb21tbW9ucw==".getBytes(Charsets.UTF_8))));
        assertEquals("AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz", new String(Base64
                .decodeBase64("QWFCYkNjRGRFZUZmR2dIaElpSmpLa0xsTW1Obk9vUHBRcVJyU3NUdFV1VnZXd1h4WXlaeg==".getBytes(Charsets.UTF_8))));
        assertEquals("{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }", new String(Base64.decodeBase64("eyAwLCAxLCAyLCAzLCA0LCA1LCA2LCA3LCA4LCA5IH0="
                .getBytes(Charsets.UTF_8))));
        assertEquals("xyzzy!", new String(Base64.decodeBase64("eHl6enkh".getBytes(Charsets.UTF_8))));
    } 
                            #location 4 
                            #vulnerability type NULL_DEREFERENCE