title: How to fix "Unable to acquire lock after 15 seconds" errors in Wildfly
body: <p>I have a web application that is <code>&lt;distributable/&gt;</code>, but also deployed to stand alone instances of Wildfly for local development work. Sometimes we have calls to the backend that can stall for a few seconds, which often leads to exceptions like the one shown below.</p>
  
  <p>How can I fix this given that I have no control over long running backend requests?</p>
  
  <pre><code>14:55:04,808 ERROR [org.infinispan.interceptors.InvocationContextInterceptor] (default task-6) ISPN000136: Error executing command LockControlCommand, writing keys []: org.infinispan.util.concurrent.TimeoutException: ISPN000299: Unable to acquire lock after 15 seconds for key LA6Q5r9L1q-VF2tyKE9Pc_bO9yYtzXu8dYt8l-BQ and requestor GlobalTransaction:&lt;null&gt;:37:local. Lock is held by GlobalTransaction:&lt;null&gt;:36:local
      at org.infinispan.util.concurrent.locks.impl.DefaultLockManager$KeyAwareExtendedLockPromise.lock(DefaultLockManager.java:236)
      at org.infinispan.interceptors.locking.AbstractLockingInterceptor.lockAllAndRecord(AbstractLockingInterceptor.java:199)
      at org.infinispan.interceptors.locking.AbstractTxLockingInterceptor.checkPendingAndLockAllKeys(AbstractTxLockingInterceptor.java:199)
      at org.infinispan.interceptors.locking.AbstractTxLockingInterceptor.lockAllOrRegisterBackupLock(AbstractTxLockingInterceptor.java:165)
      at org.infinispan.interceptors.locking.PessimisticLockingInterceptor.visitLockControlCommand(PessimisticLockingInterceptor.java:184)
      at org.infinispan.commands.control.LockControlCommand.acceptVisitor(LockControlCommand.java:110)
      at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:99)
      at org.infinispan.interceptors.TxInterceptor.invokeNextInterceptorAndVerifyTransaction(TxInterceptor.java:157)
      at org.infinispan.interceptors.TxInterceptor.visitLockControlCommand(TxInterceptor.java:215)
      at org.infinispan.commands.control.LockControlCommand.acceptVisitor(LockControlCommand.java:110)
      at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:99)
      at org.infinispan.interceptors.InvocationContextInterceptor.handleAll(InvocationContextInterceptor.java:107)
      at org.infinispan.interceptors.InvocationContextInterceptor.visitLockControlCommand(InvocationContextInterceptor.java:81)
      at org.infinispan.commands.control.LockControlCommand.acceptVisitor(LockControlCommand.java:110)
      at org.infinispan.interceptors.InterceptorChain.invoke(InterceptorChain.java:336)
      at org.infinispan.cache.impl.CacheImpl.lock(CacheImpl.java:828)
      at org.infinispan.cache.impl.CacheImpl.lock(CacheImpl.java:810)
      at org.infinispan.cache.impl.AbstractDelegatingAdvancedCache.lock(AbstractDelegatingAdvancedCache.java:177)
      at org.wildfly.clustering.web.infinispan.session.InfinispanSessionMetaDataFactory.getValue(InfinispanSessionMetaDataFactory.java:84)
      at org.wildfly.clustering.web.infinispan.session.InfinispanSessionMetaDataFactory.findValue(InfinispanSessionMetaDataFactory.java:69)
      at org.wildfly.clustering.web.infinispan.session.InfinispanSessionMetaDataFactory.findValue(InfinispanSessionMetaDataFactory.java:39)
      at org.wildfly.clustering.web.infinispan.session.InfinispanSessionFactory.findValue(InfinispanSessionFactory.java:61)
      at org.wildfly.clustering.web.infinispan.session.InfinispanSessionFactory.findValue(InfinispanSessionFactory.java:40)
      at org.wildfly.clustering.web.infinispan.session.InfinispanSessionManager.findSession(InfinispanSessionManager.java:234)
      at org.wildfly.clustering.web.undertow.session.DistributableSessionManager.getSession(DistributableSessionManager.java:140)
      at io.undertow.servlet.spec.ServletContextImpl.getSession(ServletContextImpl.java:726)
      at io.undertow.servlet.spec.HttpServletRequestImpl.getSession(HttpServletRequestImpl.java:370)
      at au.com.agic.settings.listener.SessionInvalidatorListener.clearSession(SessionInvalidatorListener.java:57)
      at au.com.agic.settings.listener.SessionInvalidatorListener.requestInitialized(SessionInvalidatorListener.java:52)
      at io.undertow.servlet.core.ApplicationListeners.requestInitialized(ApplicationListeners.java:245)
      at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:283)
      at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:263)
      at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
      at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:174)
      at io.undertow.server.Connectors.executeRootHandler(Connectors.java:202)
      at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:793)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
      at java.lang.Thread.run(Thread.java:745)
  </code></pre>