Question

我目前正在尝试通过Jersey REST服务流式传输视频文件，并在返回响应时遇到一个神秘的异常：

ERROR  WebApplicationImpl    - The RuntimeException could not be mapped to a response, re-throwing to the HTTP container java.lang.NullPointerException
at com.sun.jersey.core.util.KeyComparatorHashMap$Entry.hashCode(KeyComparatorHashMap.java:735)
at java.util.HashMap.getEntry(HashMap.java:344)
at java.util.HashMap.containsKey(HashMap.java:335)
at java.util.HashSet.contains(HashSet.java:184)
at com.sun.jersey.server.linking.impl.RefProcessor.processLinks(RefProcessor.java:85)
at com.sun.jersey.server.linking.impl.RefProcessor.processMember(RefProcessor.java:120)
at com.sun.jersey.server.linking.impl.RefProcessor.processLinks(RefProcessor.java:113)
at com.sun.jersey.server.linking.impl.RefProcessor.processMember(RefProcessor.java:120)
at com.sun.jersey.server.linking.impl.RefProcessor.processLinks(RefProcessor.java:113)
at com.sun.jersey.server.linking.impl.RefProcessor.processMember(RefProcessor.java:120)
....

创建响应的代码如下所示：

return Response.ok( new StreamingOutput( )
    {
        @Override
        public void write( OutputStream output ) throws WebApplicationException
        {
            PrintWriter out = new PrintWriter( output );
            out.println( "Foo" );
            out.close( );
        }
    }, MediaType.MULTIPART_FORM_DATA ).build( );

（我已经删除了其他范围标题和内容）。我在StreamingOutput.write（）方法中有几个断点，但似乎没有达到。我有第二个休息方法将视频作为完整的实体返回。

那么，有没有人意识到这个例外意味着什么，我能改进什么？谢谢！

Answer 1

好的，问题是Jersey LinkFilter获取解析StreamingOutput的异常。我的解决方案是编写自己的LinkFilter，扩展现有的LinkFilter，如下所示：

public class LinkFilter extends com.sun.jersey.server.linking.LinkFilter {

@Override
public ContainerResponse filter( ContainerRequest request, ContainerResponse response ){
    if ( request.getPath( true ).endsWith( "mov" ) )
    {
        return response;
    }
    else
    {
        return super.filter( request, response );
    }
}}

与泽西流媒体视频

1 个答案: