Unexpected warnning message in the log file when display a Confluence comment with speical characters ("&", "<", ">") by using the Confluence Activity Stream gadget in JIRA

Reproduction procedure:

1. Add the Confluence Activity Stream gadget in the JIRA dashboard by using the Activity Stream gadget URL provided in Confluence.
2. Add a comment to a page with the following text:

   &test
   
   <test
   
   test>
   

3. Refresh the Activity Stream gadget for Confluence on JIRA dashboard, until the new comment comes up.
4. Check the atlassian-confluence.log and we've got systematically the following error message:

   2011-10-10 13:36:09,832 WARN [StreamsCompletionService::thread-20] [streams.confluence.renderer.ContentEntityRendererFactory] stripGadgetMacros Unable to parse xml: <p>&amp;test</p><p>&nbsp;</p><p>&lt;test</p><p>&nbsp;</p><p>test&gt;</p>
    -- url: /rest/activity-stream/1.0/config | userName: admin
   org.xml.sax.SAXParseException: The entity "nbsp" was referenced, but not declared.
   	at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
   	at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)
   	at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:124)
   	at com.atlassian.streams.confluence.renderer.ContentEntityRendererFactory$ContentEntityRenderer.stripGadgetMacros(ContentEntityRendererFactory.java:249)
   	at com.atlassian.streams.confluence.renderer.ContentEntityRendererFactory$ContentEntityRenderer.content(ContentEntityRendererFactory.java:222)
   	at com.atlassian.streams.confluence.renderer.ContentEntityRendererFactory$ContentEntityRenderer.access$400(ContentEntityRendererFactory.java:95)
   	at com.atlassian.streams.confluence.renderer.ContentEntityRendererFactory$ContentEntityRenderer$3.get(ContentEntityRendererFactory.java:196)
   	at com.atlassian.streams.confluence.renderer.ContentEntityRendererFactory$ContentEntityRenderer$3.get(ContentEntityRendererFactory.java:192)
   	at com.atlassian.streams.confluence.renderer.ContentEntityRendererFactory$ContentEntityRenderer$2.apply(ContentEntityRendererFactory.java:162)
   	at com.atlassian.streams.confluence.renderer.ContentEntityRendererFactory$ContentEntityRenderer$2.apply(ContentEntityRendererFactory.java:159)
   	at com.atlassian.streams.confluence.renderer.ContentEntityRendererFactory$ContentEntityRenderer.renderContentAsHtml(ContentEntityRendererFactory.java:108)
   	at com.atlassian.streams.api.StreamsEntry$3.get(StreamsEntry.java:264)
   	at com.atlassian.streams.api.StreamsEntry$3.get(StreamsEntry.java:260)
   	at com.google.common.base.Suppliers$MemoizingSupplier.get(Suppliers.java:96)
   	at com.atlassian.streams.api.StreamsEntry.renderContentAsHtml(StreamsEntry.java:252)
   	at com.atlassian.streams.internal.atom.abdera.AbderaEntryBuilderImpl.build(AbderaEntryBuilderImpl.java:81)
   	at com.atlassian.streams.internal.LocalActivityProvider$FeedFetcher.doInTransaction(LocalActivityProvider.java:180)
   	at com.atlassian.sal.core.transaction.HostContextTransactionTemplate$1.doInTransaction(HostContextTransactionTemplate.java:25)
   	at com.atlassian.sal.spring.component.SpringHostContextAccessor$1.doInTransaction(SpringHostContextAccessor.java:88)
   	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:128)
   	at com.atlassian.sal.spring.component.SpringHostContextAccessor.doInTransaction(SpringHostContextAccessor.java:82)
   	at sun.reflect.GeneratedMethodAccessor98.invoke(Unknown Source)
   	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   	at java.lang.reflect.Method.invoke(Method.java:597)
   	at com.atlassian.plugin.osgi.hostcomponents.impl.DefaultComponentRegistrar$ContextClassLoaderSettingInvocationHandler.invoke(DefaultComponentRegistrar.java:129)
   	at $Proxy232.doInTransaction(Unknown Source)
   	at sun.reflect.GeneratedMethodAccessor98.invoke(Unknown Source)
   	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   	at java.lang.reflect.Method.invoke(Method.java:597)
   	at com.atlassian.plugin.osgi.bridge.external.HostComponentFactoryBean$DynamicServiceInvocationHandler.invoke(HostComponentFactoryBean.java:154)
   	at $Proxy232.doInTransaction(Unknown Source)
   	at com.atlassian.sal.core.transaction.HostContextTransactionTemplate.execute(HostContextTransactionTemplate.java:21)
   	at sun.reflect.GeneratedMethodAccessor578.invoke(Unknown Source)
   	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   	at java.lang.reflect.Method.invoke(Method.java:597)
   	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
   	at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:58)
   	at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.invoke(ServiceInvoker.java:62)
   	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
   	at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
   	at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
   	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
   	at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invokeUnprivileged(ServiceTCCLInterceptor.java:56)
   	at org.springframework.osgi.service.util.internal.aop.ServiceTCCLInterceptor.invoke(ServiceTCCLInterceptor.java:39)
   	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
   	at org.springframework.osgi.service.importer.support.LocalBundleContextAdvice.invoke(LocalBundleContextAdvice.java:59)
   	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
   	at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
   	at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
   	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
   	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
   	at $Proxy584.execute(Unknown Source)
   	at com.atlassian.streams.internal.LocalActivityProvider$1.get(LocalActivityProvider.java:98)
   	at com.atlassian.streams.internal.LocalActivityProvider$1.get(LocalActivityProvider.java:94)
   	at com.atlassian.streams.internal.PassThruSessionManager.withSession(PassThruSessionManager.java:11)
   	at com.atlassian.streams.internal.SwitchingSessionManager.withSession(SwitchingSessionManager.java:22)
   	at com.atlassian.streams.internal.LocalActivityProvider.getActivityFeed(LocalActivityProvider.java:93)
   	at com.atlassian.streams.internal.FeedBuilder$ToFeedCallable$1.call(FeedBuilder.java:100)
   	at com.atlassian.streams.internal.FeedBuilder$ToFeedCallable$1.call(FeedBuilder.java:86)
   	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
   	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
   	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
   	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
   	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
   	at com.atlassian.util.concurrent.LimitedExecutor$Runner.run(LimitedExecutor.java:96)
   	at com.atlassian.sal.core.executor.ThreadLocalDelegateRunnable.run(ThreadLocalDelegateRunnable.java:34)
   	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
   	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
   	at java.lang.Thread.run(Thread.java:680)