why the pageId could be found, but the page couldn't be found?

[juvenilezjp]

private static void DFSCategoryTree(Category category) throws WikiApiException
	{
		// TODO Auto-generated method stub
		if (!vCategories.contains(category.getTitle()))
		{
			System.out.println(category.getTitle());
			System.out.println(category.getNumberOfPages());
			vCategories.add(category);
			for (Integer pageId : category.getArticleIds())
			{
				if (!vPageIds.contains(pageId))
				{
					System.out.println("pageid is :" + pageId);
				}
			}
			for (Page page : category.getArticles())
			{
				if (!vPageIds.contains(page))
				{
					System.out.println("pageid is :" + page);
				}
			}

			for (Category sonCategory : category.getChildren())
			{
				DFSCategoryTree(sonCategory);
			}
		}
		return;
	}

output result:

2
pageid is :68994
pageid is :4569724
Exception in thread "main" de.tudarmstadt.ukp.wikipedia.api.exception.WikiPageNotFoundException: No page with page id 4569724 was found.
	at de.tudarmstadt.ukp.wikipedia.api.Page.fetchByPageId(Page.java:178)
	at de.tudarmstadt.ukp.wikipedia.api.Page.<init>(Page.java:90)
	at de.tudarmstadt.ukp.wikipedia.api.Wikipedia.getPage(Wikipedia.java:146)
	at de.tudarmstadt.ukp.wikipedia.api.Category.getArticles(Category.java:299)
	at iie.ac.cn.zjp.ShowCategoryInfo.DFSCategoryTree(ShowCategoryInfo.java:76)
	at iie.ac.cn.zjp.ShowCategoryInfo.DFSCategoryTree(ShowCategoryInfo.java:86)
	at iie.ac.cn.zjp.ShowCategoryInfo.DFSCategoryTree(ShowCategoryInfo.java:86)
	at iie.ac.cn.zjp.ShowCategoryInfo.showCategoryInfo(ShowCategoryInfo.java:49)
	at iie.ac.cn.zjp.ShowCategoryInfo.main(ShowCategoryInfo.java:104)

[juvenilezjp]

And the log says:

"2016.12.21 15:08:35","1027080192","678263864","processing table text..."
"2016.12.21 15:10:06","1029177344","285370688","Text 10000"
"2016.12.21 15:11:02","1031274496","463701288","Text 20000"
"2016.12.21 15:11:38","1031274496","385796456","Text 30000"
.........
"2016.12.21 15:59:06","638058496","262472576","Text 1810000"
"2016.12.21 15:59:22","639107072","266876696","Text 1820000"
"2016.12.21 15:59:36","640155648","293868264","Text 1830000"
"2016.12.21 15:59:49","640679936","196448648","Text 1840000"
"2016.12.21 16:00:02","641728512","268223384","Text 1850000"
"2016.12.21 16:00:13","642252800","213163176","writing metadata..."
"2016.12.21 16:00:13","642252800","213163176","finished"
"2016.12.21 16:00:13","642252800","213163176","End of the application. Working time = 5763189 ms"

Bug I only get 1242768 in the Page.txt

[daxenberger]

Maybe this page is from a namespace that is not included in your JWPL database? You can check whether it is in the Page table of your local database. If not, you can use e.g. the MediaWiki API to get some more meta data (e.g. namespace) about the respective page.