Jersey Json映射为java.lang.NullPointerException，无法生成Json

我有一个带有@XMLRootElement注释的域类，它将从服务返回

我的服务是：

@GET
@Produces(MediaType.APPLICATION_JSON)
@Path("/GetProductList")
public Response getProductList(@QueryParam("Username") String username,
                             @QueryParam("Password") String password) {

        CategoryResponse result = new CategoryResponse(returnDummyCategories());

        return Response.ok().entity(result).build();
    } catch (Exception e) {
        log.error("Error fetching products.", e);
        throw new WebApplicationException(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    }
}

我还将init参数放在web.xml文件中：

<init-param>
        <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
        <param-value>true</param-value>
     </init-param>

com.sun.jersey.api.json.POJOMappingFeature
真的

我也把密码放进去了

<dependency>
        <groupId>com.sun.jersey</groupId>
        <artifactId>jersey-server</artifactId>
        <version>1.17</version>
    </dependency>
    <dependency>
        <groupId>com.sun.jersey</groupId>
        <artifactId>jersey-servlet</artifactId>
        <version>1.17</version>
    </dependency>
<dependency>
  <groupId>com.owlike</groupId>
  <artifactId>genson</artifactId>
  <version>0.97</version>
</dependency>

泽西岛
泽西服务器
1.17
泽西岛
泽西servlet
1.17
com.owlike
根森
0.97

在pom.xml文件中

但我仍然得到以下例外：

java.lang.NullPointerException
com.sun.jersey.spi.container.ContainerRequest.<init>(ContainerRequest.java:188)
com.sun.jersey.spi.container.servlet.WebComponent.createRequest(WebComponent.java:446)
com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:380)
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:538)
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:716)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
info.magnolia.cms.filters.ServletDispatchingFilter.doFilter(ServletDispatchingFilter.java:123)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:67)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
info.magnolia.cms.filters.VirtualUriFilter.doFilter(VirtualUriFilter.java:70)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
info.magnolia.module.cache.executor.Bypass.processCacheRequest(Bypass.java:58)
info.magnolia.module.cache.executor.CompositeExecutor.processCacheRequest(CompositeExecutor.java:66)
info.magnolia.module.cache.filter.CacheFilter.doFilter(CacheFilter.java:153)
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
info.magnolia.cms.i18n.I18nContentSupportFilter.doFilter(I18nContentSupportFilter.java:76)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
info.magnolia.cms.filters.RangeSupportFilter.doFilter(RangeSupportFilter.java:84)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:60)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
info.magnolia.cms.security.SecurityCallbackFilter.doFilter(SecurityCallbackFilter.java:86)
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
info.magnolia.cms.security.LogoutFilter.doFilter(LogoutFilter.java:93)
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
info.magnolia.module.templatingkit.filters.SiteMergeFilter.doFilter(SiteMergeFilter.java:97)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
info.magnolia.cms.filters.MultiChannelFilter.doFilter(MultiChannelFilter.java:83)
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
info.magnolia.module.cache.filter.GZipFilter.doFilter(GZipFilter.java:75)
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:85)
info.magnolia.cms.security.auth.login.LoginFilter.doFilter(LoginFilter.java:93)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
info.magnolia.enterprise.registration.RegistrationFilter.doFilter(RegistrationFilter.java:52)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
info.magnolia.cms.filters.UnicodeNormalizationFilter.doFilter(UnicodeNormalizationFilter.java:90)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
info.magnolia.cms.filters.CosMultipartRequestFilter.doFilter(CosMultipartRequestFilter.java:91)
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
info.magnolia.module.devicedetection.filter.DeviceDetectionFilter.doFilter(DeviceDetectionFilter.java:73)
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:61)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
info.magnolia.cms.filters.ContentTypeFilter.doFilter(ContentTypeFilter.java:102)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
info.magnolia.cms.filters.ContextFilter.doFilter(ContextFilter.java:131)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:83)
info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:67)
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:91)
info.magnolia.cms.filters.SafeDestroyMgnlFilterWrapper.doFilter(SafeDestroyMgnlFilterWrapper.java:108)
info.magnolia.cms.filters.MgnlFilterDispatcher.doDispatch(MgnlFilterDispatcher.java:67)
info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:108)
info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:94)

java.lang.NullPointerException
com.sun.jersey.spi.container.ContainerRequest.（ContainerRequest.java:188）
com.sun.jersey.spi.container.servlet.WebComponent.createRequest（WebComponent.java:446）
com.sun.jersey.spi.container.servlet.WebComponent.service（WebComponent.java:380）
com.sun.jersey.spi.container.servlet.ServletContainer.service（ServletContainer.java:538）
com.sun.jersey.spi.container.servlet.ServletContainer.service（ServletContainer.java:716）
javaservlet.http.HttpServlet.service（HttpServlet.java:717）
info.magnolia.cms.filters.ServletDispatchingFilter.doFilter（ServletDispatchingFilter.java:123）
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter（AbstractMgnlFilter.java:91）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:83）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:85）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:85）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:85）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:85）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:85）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:85）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:85）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:85）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:85）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:85）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:85）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:85）
info.magnolia.cms.filters.CompositeFilter.doFilter（CompositeFilter.java:67）
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter（AbstractMgnlFilter.java:91）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:83）
info.magnolia.cms.filters.virtualuifilter.doFilter（virtualuifilter.java:70）
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter（AbstractMgnlFilter.java:91）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:83）
info.magnolia.module.cache.executor.Bypass.processCacheRequest（Bypass.java:58）
info.magnolia.module.cache.executor.CompositeExecutor.processCacheRequest（CompositeExecutor.java:66）
info.magnolia.module.cache.filter.CacheFilter.doFilter（CacheFilter.java:153）
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter（OncePerRequestAbstractMgnlFilter.java:61）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:83）
info.magnolia.cms.i18n.I18nContentSupportFilter.doFilter（I18nContentSupportFilter.java:76）
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter（AbstractMgnlFilter.java:91）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:83）
info.magnolia.cms.filters.RangeSupportFilter.doFilter（RangeSupportFilter.java:84）
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter（AbstractMgnlFilter.java:91）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:83）
info.magnolia.cms.security.BaseSecurityFilter.doFilter（BaseSecurityFilter.java:60）
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter（AbstractMgnlFilter.java:91）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:83）
info.magnolia.cms.security.SecurityCallbackFilter.doFilter（SecurityCallbackFilter.java:86）
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter（OncePerRequestAbstractMgnlFilter.java:61）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:83）
info.magnolia.cms.security.LogoutFilter.doFilter（LogoutFilter.java:93）
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter（OncePerRequestAbstractMgnlFilter.java:61）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:83）
info.magnolia.module.templatingkit.filters.SiteMergeFilter.doFilter（SiteMergeFilter.java:97）
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter（AbstractMgnlFilter.java:91）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:83）
info.magnolia.cms.filters.MultiChannelFilter.doFilter（MultiChannelFilter.java:83）
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter（OncePerRequestAbstractMgnlFilter.java:61）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:83）
info.magnolia.module.cache.filter.GZipFilter.doFilter（GZipFilter.java:75）
info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter（OncePerRequestAbstractMgnlFilter.java:61）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:83）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:85）
info.magnolia.cms.security.auth.login.LoginFilter.doFilter（LoginFilter.java:93）
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter（AbstractMgnlFilter.java:91）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:83）
info.magnolia.enterprise.registration.RegistrationFilter.doFilter（RegistrationFilter.java:52）
info.magnolia.cms.filters.AbstractMgnlFilter.doFilter（AbstractMgnlFilter.java:91）
info.magnolia.cms.filters.MgnlFilterChain.doFilter（MgnlFilterChain.java:83）
info.magnolia.cms.filters.UnicodeNormalizationFilter.doFilter（UnicodeNormalizationFilter.java:90）
info.magnolia.cms.filters.AbstractMgnlFilter.doFil