我正在使用带有IBM jdk 1.6.0_26的Restlet Version 2.2.0，并尝试实现REST服务。在执行测试项目时，我收到以下错误：

Starting the internal [HTTP/1.1] server on port 8080
Server started ...
An exception occured writing the response entity

java.lang.NoSuchMethodError: javax/xml/stream/XMLInputFactory.newFactory()Ljavax/xml/stream/XMLInputFactory;
    at org.restlet.ext.jackson.JacksonRepresentation.createObjectMapper(JacksonRepresentation.java:215)
    at org.restlet.ext.jackson.JacksonRepresentation.getObjectMapper(JacksonRepresentation.java:333)
    at org.restlet.ext.jackson.JacksonRepresentation.createObjectWriter(JacksonRepresentation.java:277)
    at org.restlet.ext.jackson.JacksonRepresentation.getObjectWriter(JacksonRepresentation.java:361)
    at org.restlet.ext.jackson.JacksonRepresentation.write(JacksonRepresentation.java:474)
    at org.restlet.engine.adapter.ServerCall.writeResponseBody(ServerCall.java:519)
    at org.restlet.engine.adapter.ServerCall.sendResponse(ServerCall.java:463)
    at org.restlet.engine.adapter.ServerAdapter.commit(ServerAdapter.java:196)
    at org.restlet.engine.adapter.HttpServerHelper.handle(HttpServerHelper.java:153)
    at org.restlet.engine.connector.HttpServerHelper$1.handle(HttpServerHelper.java:73)
    at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:77)
    at sun.net.httpserver.AuthFilter.doFilter(AuthFilter.java:77)
    at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:80)
    at sun.net.httpserver.ServerImpl$Exchange$LinkHandler.handle(ServerImpl.java:567)
    at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:77)
    at sun.net.httpserver.ServerImpl$Exchange.run(ServerImpl.java:539)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:897)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:919)
    at java.lang.Thread.run(Thread.java:737)
Unable to send error response

java.io.IOException: headers already sent
    at sun.net.httpserver.ExchangeImpl.sendResponseHeaders(ExchangeImpl.java:180)
    at sun.net.httpserver.HttpExchangeImpl.sendResponseHeaders(HttpExchangeImpl.java:80)
    at org.restlet.engine.connector.HttpExchangeCall.writeResponseHead(HttpExchangeCall.java:157)
    at org.restlet.engine.adapter.ServerCall.sendResponse(ServerCall.java:459)
    at org.restlet.engine.adapter.ServerAdapter.commit(ServerAdapter.java:214)
    at org.restlet.engine.adapter.HttpServerHelper.handle(HttpServerHelper.java:153)
    at org.restlet.engine.connector.HttpServerHelper$1.handle(HttpServerHelper.java:73)
    at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:77)
    at sun.net.httpserver.AuthFilter.doFilter(AuthFilter.java:77)
    at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:80)
    at sun.net.httpserver.ServerImpl$Exchange$LinkHandler.handle(ServerImpl.java:567)
    at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:77)
    at sun.net.httpserver.ServerImpl$Exchange.run(ServerImpl.java:539)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:897)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:919)
    at java.lang.Thread.run(Thread.java:737)

在使用Sun/Oracle 1.6 JDK时，这个问题不存在，但我需要继续使用IBM jdk 1.6.0_26。
任何帮助都将不胜感激。
谢谢你，EHa