[NUTCH-2641] ClassCastException in webui

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.4, 1.15
• Fix Version/s: 2.4, 1.16
• Component/s: web gui
• Assignee: Unassigned
• Reporter: Rustam Abdullaev
• Created: 04/Sep/18 14:21
• Updated: 28/Jan/21 13:56
• Resolved: 07/Oct/18 18:42

Description

webui 2.x constantly logs this exception whenever the status of a crawl changes:

java.lang.ClassCastException: org.apache.nutch.webui.client.model.JobInfo$State cannot be cast to [Ljava.lang.Object;
at java.text.MessageFormat.format(MessageFormat.java:865)
at java.text.Format.format(Format.java:157)
at org.apache.nutch.webui.client.impl.RemoteCommand.toString(RemoteCommand.java:72)
at org.slf4j.helpers.MessageFormatter.safeObjectAppend(MessageFormatter.java:305)
at org.slf4j.helpers.MessageFormatter.deeplyAppendParameter(MessageFormatter.java:277)
at org.slf4j.helpers.MessageFormatter.arrayFormat(MessageFormatter.java:231)
at org.slf4j.helpers.MessageFormatter.format(MessageFormatter.java:124)
at org.slf4j.impl.Log4jLoggerAdapter.info(Log4jLoggerAdapter.java:322)
at org.apache.nutch.webui.client.impl.CrawlingCycle.executeCrawlCycle(CrawlingCycle.java:63)
at org.apache.nutch.webui.service.impl.CrawlServiceImpl.startCrawl(CrawlServiceImpl.java:71)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.aop.interceptor.AsyncExecutionInterceptor$1.call(AsyncExecutionInterceptor.java:97)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

The issue is in RemoteCommand, line 72. The arguments to MessageFormat.format() should be in an array, even when there is only one.

statusInfo = new MessageFormat("{0}", Locale.ROOT).format(new Object[] {jobInfo.getState()});

Issue Links

• links to: GitHub Pull Request #380