登录
当前位置： 首页 > 面试题库 >

休眠“ APAPENT DEADLOCK ！！！为未分配的待处理任务创建紧急线程！”

储毅
2023-03-14
问题内容：

我最近在日志中收到以下消息，随后出现JVM崩溃（由于OOME）。我不确定该怎么做，真的很感谢任何指导。

2015-03-19 21:15:02,457 [Timer-0] WARN  (ThreadPoolAsynchronousRunner.java [run]:608) - com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@6824f21c -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks! 
2015-03-19 21:26:29,543 [Timer-0] WARN  (ThreadPoolAsynchronousRunner.java [run]:624) - com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@6824f21c -- APPARENT DEADLOCK!!! Complete Status: 
    Managed Threads: 3
    Active Threads: 3
    Active Tasks: 
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@15da1b6b (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2)
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@b35b08a (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1)
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@51cfdd17 (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0)
    Pending Tasks: 
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@19397937
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@5c7d3838
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@7aea62dd
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@55622ff2
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@74004a8
Pool thread stack traces:
    Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0,5,main]
        com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:560)
    Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2,5,main]
        java.net.SocketOutputStream.socketWrite0(Native Method)
        java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:109)
        java.net.SocketOutputStream.write(SocketOutputStream.java:153)
        java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
        java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
        com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3227)
        com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1917)
        com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2060)
        com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2536)
        com.mysql.jdbc.ConnectionImpl.configureClientCharacterSet(ConnectionImpl.java:1751)
        com.mysql.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3425)
        com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2196)
        com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:718)
        com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)
        sun.reflect.GeneratedConstructorAccessor306.newInstance(Unknown Source)
        sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        java.lang.reflect.Constructor.newInstance(Constructor.java:408)
        com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
        com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:302)
        com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:282)
        com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:135)
        com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182)
        com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)
        com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137)
        com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014)
        com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810)
        com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
    Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1,5,main]
        com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:560)


2015-03-19 21:56:59,137 [Timer-0] WARN  (ThreadPoolAsynchronousRunner.java [run]:608) - com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@6824f21c -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks! 
2015-03-19 21:56:59,143 [eXistThread-18676] ERROR (XQueryServlet.java [process]:566) - Java heap space 
java.lang.OutOfMemoryError: Java heap space
    at org.exist.storage.btree.BTree$BTreeNode.read(BTree.java:1269)
    at org.exist.storage.btree.BTree$BTreeNode.access$16(BTree.java:1239)
    at org.exist.storage.btree.BTree.getBTreeNode(BTree.java:460)
    at org.exist.storage.btree.BTree.scanSequential(BTree.java:413)
    at org.exist.storage.btree.BTree$BTreeNode.scanNextPage(BTree.java:2039)
    at org.exist.storage.btree.BTree$BTreeNode.query(BTree.java:1835)
    at org.exist.storage.btree.BTree$BTreeNode.query(BTree.java:1759)
    at org.exist.storage.btree.BTree$BTreeNode.query(BTree.java:1759)
    at org.exist.storage.btree.BTree$BTreeNode.query(BTree.java:1759)
    at org.exist.storage.btree.BTree$BTreeNode.access$12(BTree.java:1734)
    at org.exist.storage.btree.BTree.query(BTree.java:379)
    at org.exist.storage.structural.NativeStructuralIndexWorker.scanByType(NativeStructuralIndexWorker.java:259)
    at org.exist.dom.VirtualNodeSet.getNodesFromIndex(VirtualNodeSet.java:457)
    at org.exist.dom.VirtualNodeSet.realize(VirtualNodeSet.java:585)
    at org.exist.dom.VirtualNodeSet.iterator(VirtualNodeSet.java:860)
    at org.exist.dom.AbstractNodeSet.iterator(AbstractNodeSet.java:1)
    at org.exist.storage.structural.NativeStructuralIndexWorker.findDescendantsByTagName(NativeStructuralIndexWorker.java:162)
    at org.exist.xquery.LocationStep.getAttributes(LocationStep.java:645)
    at org.exist.xquery.LocationStep.eval(LocationStep.java:434)
    at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
    at org.exist.xquery.PathExpr.eval(PathExpr.java:264)
    at org.exist.xquery.Predicate.selectByNodeSet(Predicate.java:446)
    at org.exist.xquery.Predicate.evalPredicate(Predicate.java:326)
    at org.exist.xquery.LocationStep.processPredicate(LocationStep.java:251)
    at org.exist.xquery.LocationStep.applyPredicate(LocationStep.java:238)
    at org.exist.xquery.LocationStep.eval(LocationStep.java:462)
    at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)
    at org.exist.xquery.PathExpr.eval(PathExpr.java:264)
    at org.exist.xquery.LetExpr.eval(LetExpr.java:142)
    at org.exist.xquery.LetExpr.eval(LetExpr.java:187)
    at org.exist.xquery.LetExpr.eval(LetExpr.java:187)
    at org.exist.xquery.BindingExpression.eval(BindingExpression.java:164)
2015-03-19 21:56:59,147 [Timer-0] WARN  (ThreadPoolAsynchronousRunner.java [run]:624) - com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@6824f21c -- APPARENT DEADLOCK!!! Complete Status: 
    Managed Threads: 3
    Active Threads: 3
    Active Tasks: 
        com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@79180a12 (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0)
        com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@243c6d0c (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1)
        com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@50191373 (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2)
    Pending Tasks: 
        com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@3a9d08ca
        com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@3ecdd11
        com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@44ff846d
        com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@5ce5850a
        com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@eec1d04
        com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@6b8d4d9d
        com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@53e9706d
        com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@23d472cf
        com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@4dbe4f8c
        com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@4c5e0203
        com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@54ac79fd
        com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask@546e2bad
        com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask@6b13cc83
        com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask@57e185f8
        com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask@60357d68
        com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask@45231180
        com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask@3021aa73
        com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask@6bb437ca
        com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask@2021c9e9
        com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask@7d53637c
        com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask@409c2c97
        com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask@adc5929
        com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask@241ca71a
        com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask@42b26866
        com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask@636b1c33
        com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask@b160466
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@4af34669
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@1b53e609
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@2062ebd4
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@1b6cfe8a
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@4b7c2380
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@4f9be748
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@78108924
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@474b002
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@2ebee32f
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@3e0fe017
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@42aa175b
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@637f5bac
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@3a017b77
        com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@7b4f2b78
Pool thread stack traces:
    Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1,5,main]
        sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        java.lang.reflect.Constructor.newInstance(Constructor.java:408)
        com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
        com.mysql.jdbc.ResultSetImpl.getInstance(ResultSetImpl.java:370)
        com.mysql.jdbc.MysqlIO.buildResultSetWithRows(MysqlIO.java:2532)
        com.mysql.jdbc.MysqlIO.getResultSet(MysqlIO.java:477)
        com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:2510)
        com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:1746)
        com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2135)
        com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2536)
        com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2465)
        com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1383)
        com.mysql.jdbc.DatabaseMetaData$9.forEach(DatabaseMetaData.java:4826)
        com.mysql.jdbc.IterateBlock.doForAll(IterateBlock.java:50)
        com.mysql.jdbc.DatabaseMetaData.getTables(DatabaseMetaData.java:4804)
        com.mchange.v2.c3p0.impl.DefaultConnectionTester.activeCheckConnectionNoQuery(DefaultConnectionTester.java:185)
        com.mchange.v2.c3p0.impl.DefaultConnectionTester.activeCheckConnection(DefaultConnectionTester.java:62)
        com.mchange.v2.c3p0.AbstractConnectionTester.activeCheckConnection(AbstractConnectionTester.java:67)
        com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.testPooledConnection(C3P0PooledConnectionPool.java:368)
        com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.refurbishIdleResource(C3P0PooledConnectionPool.java:310)
        com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask.run(BasicResourcePool.java:1999)
        com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
    Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2,5,main]
        com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2596)
        com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2465)
        com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1383)
        com.mysql.jdbc.DatabaseMetaData$9.forEach(DatabaseMetaData.java:4826)
        com.mysql.jdbc.IterateBlock.doForAll(IterateBlock.java:50)
        com.mysql.jdbc.DatabaseMetaData.getTables(DatabaseMetaData.java:4804)
        com.mchange.v2.c3p0.impl.DefaultConnectionTester.activeCheckConnectionNoQuery(DefaultConnectionTester.java:185)
        com.mchange.v2.c3p0.impl.DefaultConnectionTester.activeCheckConnection(DefaultConnectionTester.java:62)
        com.mchange.v2.c3p0.AbstractConnectionTester.activeCheckConnection(AbstractConnectionTester.java:67)
        com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.testPooledConnection(C3P0PooledConnectionPool.java:368)
        com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.refurbishIdleResource(C3P0PooledConnectionPool.java:310)
        com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask.run(BasicResourcePool.java:1999)
        com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
    Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0,5,main]
        java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1012)
        java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:1006)
        com.newrelic.agent.TransactionService.addTransaction(TransactionService.java:142)
        com.newrelic.agent.Transaction.getTransaction(Transaction.java:1104)
        com.newrelic.agent.Transaction.getTransaction(Transaction.java:1087)
        com.newrelic.agent.TracerService$TracerServiceImpl.getTracer(TracerService.java:136)
        com.newrelic.agent.TracerService.getTracer(TracerService.java:41)
        com.newrelic.agent.instrumentation.InvocationPoint.invoke(InvocationPoint.java:55)
        com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java)
        com.mysql.jdbc.DatabaseMetaData$9.forEach(DatabaseMetaData.java:4826)
        com.mysql.jdbc.IterateBlock.doForAll(IterateBlock.java:50)
        com.mysql.jdbc.DatabaseMetaData.getTables(DatabaseMetaData.java:4804)
        com.mchange.v2.c3p0.impl.DefaultConnectionTester.activeCheckConnectionNoQuery(DefaultConnectionTester.java:185)
        com.mchange.v2.c3p0.impl.DefaultConnectionTester.activeCheckConnection(DefaultConnectionTester.java:62)
        com.mchange.v2.c3p0.AbstractConnectionTester.activeCheckConnection(AbstractConnectionTester.java:67)
        com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.testPooledConnection(C3P0PooledConnectionPool.java:368)
        com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.refurbishIdleResource(C3P0PooledConnectionPool.java:310)
        com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask.run(BasicResourcePool.java:1999)
        com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)

我们在以下c3p0配置中使用hiberanate和c3p0：

我们将以下Maven工件用于hibernate和c3p0：

 <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>4.3.6.Final</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-c3p0</artifactId>
            <version>4.3.6.Final</version>
        </dependency>

具有以下c3p0配置：

  configuration = new Configuration().setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL5InnoDBDialect")
  .setProperty("hibernate.connection.provider_class", "org.hibernate.connection.C3P0ConnectionProvider")
  .setProperty("hibernate.c3p0.idle_test_period", "1000")
  .setProperty("hibernate.c3p0.min_size", "20")
  .setProperty("hibernate.c3p0.max_size", "50")
  .setProperty("hibernate.c3p0.timeout", "1800")
  .setProperty("hibernate.c3p0.max_statements", "50")

服务器处于非常轻的负载下〜每秒查询5次。（Java 8）


问题答案：

因此，直接的问题是连接池试图获取新的连接，但是试图获取这些任务的任务冻结了很长一段时间，以至于c3p0决定必须将任务进行死锁，然后丢弃并替换线程池。后来，线程池被挂在空闲连接测试任务上。

通常，“挂起”任务看起来像第一个“
Pool线程堆栈跟踪：”下方的第二个Thread：执行无法完成的网络IO。您的情况很奇怪，因为三个线程中的两个没有卡在IO中。他们刚刚开始做任何事情，但他们还没有活着。然后，您会遇到OutOfMemoryError，并且在空闲连接测试任务上也得到另一个APPARENT
DEADLOCK，看起来也应该很活跃。

也许您的应用程序与某种资源限制非常接近，导致资源运行缓慢。直接地，您可能会增加此应用程序可用的内存量（或修改它以减少内存占用）。在线程池第二次尝试刷新并重新创建挂起的线程时，您会遇到一个OOME，这不是由它直接引起的，而很可能是由不断增长的线程占用空间引起的。（在您的日志中，以前是否有很多这样的APPARENT
DEADLOCK
？？如果您强制执行JVM线程转储，您是否看到com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread周围有很多实例，仍然挂在旧实例上，未完成任务？

一些一般性的评论：如果您的负载不超过5个并发查询，为什么会有这么大的资源池？为什么不min_size5欧元，最多10欧元？对于池中允许的连接数，您的max_statements设置太小了。我会完全忽略这一点，直到您一切顺利为止。然后，为了获得更好的性能，您可以根据需要设置更直接的原因maxStatementsPerConnection。

通常，您需要通过增加资源，减少其占用空间或解决可能导致其资源占用增加到极限的任何问题，使应用程序的占用空间（内存？线程？）远低于分配给它的资源。首先，使池变小，可用内存变大，然后将池配置成更小。



 类似资料：
  • 处理休眠事务

    问题内容： 目前，我在 每个 Controller方法中 都 重复了以下代码： 这是正确的方法还是有更好的方法，也许在一个我可以引用的单独的类中？如果是这样，怎么办？每当我尝试将其放在单独的类中并从其他类中引用它时，它都会失败。 编辑 ：我正在尝试使用尽可能少的外部库。如果Java在JDK中内置了ORM / JPA实现，我就不会使用Hibernate。 问题答案： 我本人已经遇到了很多次。通常，我

  • Ant休眠任务

    此任务用于在指定时间内进入睡眠过程。时间可以是毫秒，秒或小时。 在部署应用程序时需要在任务之间间隔时非常有用。 它使用下面给出的各种属性。 1. Apache Ant睡眠任务属性 属性 描述 必需 设定睡眠小时数 否 设定睡眠的分钟数 否 设置睡眠秒数 否 设置睡眠时间(以毫秒为单位) 否 标志控制是否打断错误的构建 否 2. Apache Ant睡眠任务示例 指定睡眠的毫秒数： 指定睡眠的秒数：

  • 创建数据处理任务

    接口说明 为上传完成的数据创建该数据的处理任务 API地址 POST /api/upload/1.0.0/createTask 是否需要登录 是 请求字段说明 参数 类型 请求类型 是否必须 说明 title string form 否 标题 position string form 否 位置（例如：'120,30,0'） description string form 否 描述 dataGuid

  • 休眠：未配置CurrentSessionContext

    问题内容： 我不断得到： HibernateException：未配置CurrentSessionContext！ 在我的代码中。其他返回的唯一信息是罪魁祸首是： 在我的hibernate.cfg.xml中。我的hibernate.cfg.xml文件中确实有该文件，并且我正在Tomcat 6中运行它。有人知道其他可能的原因吗？ 问题答案： 我相信您需要将current_session_contex

  • 休眠异常处理

    问题内容： 我有一个“复杂”的问题。 我正在使用Hibernate / JPA与数据库进行事务。 我不是DBA，客户端使用了我的应用程序，即RESTful Web服务。我的问题是数据库已更改（不是很频繁，但仍在更改）。另外，客户端并不总是尊重我的应用程序的输入（长度，类型等）。发生这种情况时，Hibernate会引发异常。异常很难翻译和从日志中读取，因为它具有嵌套的异常并且由很多文本组成：就像我说

  • 未为Stage-Spark创建任务

    我有一个工作，需要一个HiveQL连接2个表(2.5TB，45GB)，重新分区到100，然后做一些其他的转换。这是早些时候执行的罚款。 作业阶段：阶段0：配置单元表1扫描阶段1：配置单元表2扫描阶段2：连接的钨交换阶段3：修复的钨交换 今天这项工作陷入了第二阶段。在200个应该执行的任务中，没有一个任务已经开始，但是290个任务由于执行程序被抢占而失败。 在深入研究阶段时，它说“执行者没有报告度量

相关阅读

为每个请求创建休眠会话为休眠3.6配置pom.xml休眠批处理插入，批处理更新休眠会话线程休眠事务未成功启动

相关文章

线程的具体创建Java 创建线程的方式Eclipse 任务管理Java 线程执行多个任务华为机试：数据分类处理

相关问答

Android-不能在未调用looper.prepare（）的线程内创建处理程序spring批处理：如何动态创建步骤和任务处理分级任务依赖关系创建2个线程，每个线程运行不同的任务什么是紧急逃生舱？

相关工具

仿微信【未完待续】迷你任务高仿新浪微博客户端（未完待续）多线程页面抓取服务器数据库处理框架

相关文档

小米数据处理和分析服务（EMR）使用指南Python 文本处理Python 自然语言处理教程PyTorch 自然语言处理Python 自然语言处理
快捷导航： 新手教程 算法原理 架构设计 Java进阶 数据库进阶 大厂专栏 面试经验 编程笔记 编程问答 所有专题 文档资料 工具软件 电子书籍 小牛导航
在线工具： 房贷计算器 个税计算器 Linux命令查询 Json格式化 正则表达式 颜色转换 AES加解密 SHA1加密 MD5加密 毒鸡汤 字数统计 随机密码生成 进制转换 Base64编解码 励志句子
Copyright © 2019-2024 小牛知识库@xnip.cn. All Rights Reserved.