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From "Christine Koppelt (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (ABDERA-259) NullPointerException happens when trying to decode HEAD response
Date Sun, 30 Jan 2011 11:34:44 GMT

     [ https://issues.apache.org/jira/browse/ABDERA-259?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Christine Koppelt reassigned ABDERA-259:
----------------------------------------

    Assignee: Christine Koppelt

> 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: 0.4.0, 1.0
>            Reporter: Tong Xiang Fan
>            Assignee: Christine Koppelt
>
> 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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