Question

我正在使用Apache Jackrabbit。

我发现了一个例外，我尝试了很多，但没有得到这个例外背后的原因。

请帮我解决这个问题。

例外： -

javax.jcr.RepositoryException: This session has been closed.
    at org.apache.jackrabbit.jcr2spi.SessionImpl.checkIsAlive(SessionImpl.java:922)
    at org.apache.jackrabbit.jcr2spi.ItemImpl.checkStatus(ItemImpl.java:436)
    at org.apache.jackrabbit.jcr2spi.NodeImpl.getProperties(NodeImpl.java:489)
    at edu.uci.ics.crawler4j.frontier.DocIDServer.getDocId(DocIDServer.java:112)
    at edu.uci.ics.crawler4j.crawler.WebCrawler.processPage(WebCrawler.java:286)
    at edu.uci.ics.crawler4j.crawler.WebCrawler.run(WebCrawler.java:189)
    at java.lang.Thread.run(Thread.java:722)

编辑第1号

代码如下，

Repository repository = JcrUtils.getRepository("http://localhost:4502/crx/server");
Session session = repository.login(new SimpleCredentials("admin", "admin".toCharArray()));

// Obtain the query manager for the session via the workspace ...
QueryManager queryManager = session.getWorkspace().getQueryManager();

// Create a query object ...
String expression = "SELECT * FROM [sling:OrderedFolder] AS s WHERE ISDESCENDANTNODE([/docIDsDB])";
Query query = queryManager.createQuery(expression, javax.jcr.query.Query.JCR_SQL2);

// Execute the query and get the results ...
QueryResult result = query.execute();

// Iterate over the nodes in the results ...
NodeIterator nodeIter = result.getNodes();

session.logout();

while(nodeIter.hasNext()){
    Node node = nodeIter.nextNode();
    System.out.println(node.getProperty("url").getString());
    System.out.println(node.getProperty("docid").getString());

}

异常

javax.jcr.RepositoryException: This session has been closed.
    at org.apache.jackrabbit.jcr2spi.SessionImpl.checkIsAlive(SessionImpl.java:922)
    at org.apache.jackrabbit.jcr2spi.ItemImpl.checkStatus(ItemImpl.java:436)
    at org.apache.jackrabbit.jcr2spi.NodeImpl.getProperty(NodeImpl.java:471)
    at jackrabbit.JackRabbit.main(JackRabbit.java:111)

第111行

System.out.println(node.getProperty("url").getString());

在Jackrabbit中，节点和子节点都是吊索：orderedFolder类型。

Answer 1

只要您访问它提供的节点，就可以保持JCR会话处于打开状态。

您应该将Session.logout（）调用移动到finally子句，该子句位于使用Session提供的所有代码之后。

Answer 2

您应该在重用已存储的session.isLive()之前测试Session，并在此方法返回false时重新获取它。

Apache Jackrabbit：RepositoryException：此会话已关闭

2 个答案: