"Hook previously registered" Problem

[Ran]

Hi, all

I called ldspider from another class, when it finished and run second time I got the following exception. Seems some file/ thread didn't close preperly, but I can't find it. Have anyone run into that? 

java.lang.IllegalArgumentException: Hook previously registered

        at java.lang.ApplicationShutdownHooks.add(ApplicationShutdownHooks.java:72)

        at java.lang.Runtime.addShutdownHook(Runtime.java:211)

        at com.ontologycentral.ldspider.ldspiderMain.run(ldspiderMain.java:681)

        at com.ontologycentral.ldspider.ldspiderMain.ldspiderMain(ldspiderMain.java:373)

        at main.java.focusedCrawler.focusedCrawlerMain.runPlainBFCrawl(focusedCrawlerMain.java:93)

        at main.java.focusedCrawler.focusedCrawlerMain.focusedCrawlerMain(focusedCrawlerMain.java:60)

        at crawl_api.RestAnnotate.crawl_data(RestAnnotate.java:56)

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

        at java.lang.reflect.Method.invoke(Method.java:606)

        at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)

        at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:185)

        at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)

        at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302)

        at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)

        at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)

        at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)

        at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)

        at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542)

        at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473)

        at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)

        at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)

        at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409)

[Andreas Harth]

Hi Ran,

do you try to re-use the objects? Could you do "new" when you use the
objects a second time? Or do you need to keep state (e.g., the set of
visited URIs) between the two runs?

Cheers,
Andreas.

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