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From "Tong Xiang Fan (JIRA)" <j...@apache.org>
Subject [jira] Created: (ABDERA-259) NullPointerException happens when trying to decode HEAD response
Date Tue, 20 Jul 2010 08:37:49 GMT
NullPointerException happens when trying to decode HEAD response
----------------------------------------------------------------

                 Key: ABDERA-259
                 URL: https://issues.apache.org/jira/browse/ABDERA-259
             Project: Abdera
          Issue Type: Bug
    Affects Versions: 1.0, 0.4.0
            Reporter: Tong Xiang Fan


The client code sends HEAD request to HTTP server. The Content-Encoding header is not null
so it tries to decode the response. However httpclient HeadMethod returns null as response
body stream. Hence NullPointerException happens.

java.lang.NullPointerException
	at java.util.zip.InflaterInputStream.<init>(InflaterInputStream.java:91)
	at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:81)
	at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:93)
	at org.apache.abdera.util.CompressionUtil.getDecodingInputStream(CompressionUtil.java:71)
	at org.apache.abdera.protocol.util.EncodingUtil.getDecodingInputStream(EncodingUtil.java:160)
	at org.apache.abdera.protocol.client.CommonsResponse.getInputStream(CommonsResponse.java:156)
	at org.apache.abdera.protocol.client.cache.InMemoryCachedResponse.<init>(InMemoryCachedResponse.java:55)
	at org.apache.abdera.protocol.client.cache.InMemoryCache.createCachedResponse(InMemoryCache.java:44)
	at org.apache.abdera.protocol.client.cache.AbstractCache.update(AbstractCache.java:142)
	at org.apache.abdera.protocol.client.cache.AbstractCache.update(AbstractCache.java:130)
	at org.apache.abdera.protocol.client.AbderaClient.execute(AbderaClient.java:698)
	at org.apache.abdera.protocol.client.AbderaClient.head(AbderaClient.java:167)
	at org.apache.abdera.protocol.client.AbderaClient.head(AbderaClient.java:344)

Sample response:

Date: Tue, 20 Jul 2010 07:53:08 GMT
Server: IBM_HTTP_Server/6.1 Apache/2.0.47 (Win32)
Expires: Thu, 1 Jan 1970 00:00:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Vary: Accept-Encoding
Content-Encoding: gzip
Keep-Alive: timeout=10, max=100
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: text/html; charset=UTF-8
Content-Language: en-US

org.apache.abdera.protocol.client.CommonsResponse:

  public InputStream getInputStream() throws IOException {
    if (in == null) {
      String ce = getHeader("Content-Encoding");
      in = method.getResponseBodyAsStream(); // returns null if method is HEAD
      if (ce != null)
        in = EncodingUtil.getDecodingInputStream(in, ce);
      in = new AutoReleasingInputStream(method,in);
    }
    return in;
  }


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