On Thu, Oct 17, 2013 at 12:46 AM, Niki Dokovski <nick...@gmail.com> wrote:
>
>
>
> On Wed, Oct 16, 2013 at 6:36 PM, Daniel Mikusa <dmik...@gopivotal.com>wrote:
>
>> I have a simple WebSocket endpoint defined, it is just echoing the data
>> sent by the client. Here's the code.
>>
>> @ServerEndpoint(value="/websocket",
>> decoders={ListStringDecoder.class},
>> encoders={ListStringEncoder.class})
>> public static class Server {
>> @OnMessage
>> public List<String> rx(List<String> in) {
>> return in;
>> }
>> }
>>
>> As you can see by the endpoint annotation, I'm defining an encoder and
>> decoder. Here's the code for that.
>>
>> public static class ListStringEncoder implements
>> Encoder.Text<List<String>> {
>>
>> @Override
>> public void init(EndpointConfig endpointConfig) {
>> }
>>
>> @Override
>> public void destroy() {
>> }
>>
>> @Override
>> public String encode(List<String> list) throws EncodeException {
>> return list.toString();
>> }
>> }
>>
>> public static class ListStringDecoder implements
>> Decoder.Text<List<String>> {
>>
>> @Override
>> public void init(EndpointConfig endpointConfig) {
>> }
>>
>> @Override
>> public void destroy() {
>> }
>>
>> @Override
>> public List<String> decode(String data) throws DecodeException {
>> List<String> tmp = new ArrayList<String>();
>> for (String str : data.substring(1, data.length() -
>> 1).split(",")) {
>> tmp.add(str);
>> }
>> return tmp;
>> }
>>
>> @Override
>> public boolean willDecode(String s) {
>> return s.startsWith("[") && s.endsWith("]");
>> }
>> }
>>
>> Now when I run this, I get the following exception as Tomcat starts up.
>>
>> 16-Oct-2013 11:29:40.311 SEVERE [localhost-startStop-1]
>> org.apache.catalina.core.StandardContext.listenerStart Exception sending
>> context initialized event to listener instance of class
>> org.apache.tomcat.websocket.pojo.TesterUtil$ServerConfigListener
>> java.lang.NullPointerException
>> at
>> org.apache.tomcat.websocket.Util$DecoderMatch.<init>(Util.java:428)
>> at
>> org.apache.tomcat.websocket.pojo.PojoMethodMapping$MessageHandlerInfo.<init>(PojoMethodMapping.java:396)
>> at
>> org.apache.tomcat.websocket.pojo.PojoMethodMapping.<init>(PojoMethodMapping.java:114)
>> at
>> org.apache.tomcat.websocket.server.WsServerContainer.addEndpoint(WsServerContainer.java:194)
>> at
>> org.apache.tomcat.websocket.pojo.TesterUtil$ServerConfigListener.contextInitialized(TesterUtil.java:45)
>> at
>> org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4830)
>> at
>> org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5276)
>> at
>> org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
>> at
>> org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1390)
>> at
>> org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1)
>> at
>> java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
>> at java.util.concurrent.FutureTask.run(FutureTask.java:166)
>> at
>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>> at
>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>> at java.lang.Thread.run(Thread.java:724)
>>
>> If I change my encoder & decoder to use "List" rather than "List<String>"
>> everything works fine.
>>
>> Any thoughts on what's going on here?
>>
>
> Hi Dan,
> IMHO current implementation of
> o.a.t.w.Util#getGenericType/getTypeParameter can be improved. More detailed
> inspection of the typed parameter will help. Your sample runs perfectly
> well on WebSocket RI implementation, hence I think this is a bug in Tomcat.
>
Bug report https://issues.apache.org/bugzilla/show_bug.cgi?id=55664
> cheers
> Niki
>
>
>>
>> Thanks
>>
>> Dan
>>
>>
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>>
>
