<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Sometimes (I am not sure what the actual reason is yet ) I get following NPE when I try to deserialize my ksessions:<div><br></div><div><div style="margin: 0px; font-size: 12px; font-family: Monaco; color: rgb(1, 25, 147); "><span style="text-decoration: underline">java.lang.NullPointerException</span></div><div style="margin: 0px; font-size: 12px; font-family: Monaco; color: rgb(255, 38, 0); "><span class="Apple-tab-span" style="white-space:pre"> </span>at org.drools.common.ConcurrentNodeMemories.getNodeMemory(<span style="text-decoration: underline ; color: #011993">ConcurrentNodeMemories.java:63</span>)</div><div style="margin: 0px; font-size: 12px; font-family: Monaco; color: rgb(255, 38, 0); "><span class="Apple-tab-span" style="white-space:pre"> </span>at org.drools.common.AbstractWorkingMemory.getNodeMemory(<span style="text-decoration: underline ; color: #011993">AbstractWorkingMemory.java:1034</span>)</div><div style="margin: 0px; font-size: 12px; font-family: Monaco; color: rgb(255, 38, 0); "><span class="Apple-tab-span" style="white-space:pre"> </span>at org.drools.rule.SlidingTimeWindow$BehaviorExpireWMAction.<init>(<span style="text-decoration: underline ; color: #011993">SlidingTimeWindow.java:460</span>)</div></div><div style="margin: 0px; font-size: 12px; font-family: Monaco; color: rgb(255, 38, 0); "><br></div><div style="margin: 0px; ">This is not a new problem, I found an old post on the mailing list, that describes the same here: (but unfortunately without any answers)</div><div style="margin: 0px; font-size: 12px; font-family: Monaco; color: rgb(255, 38, 0); "><a href="http://drools.46999.n3.nabble.com/rules-users-5-5-0-Final-persistence-to-MySQL-td4023628.html">http://drools.46999.n3.nabble.com/rules-users-5-5-0-Final-persistence-to-MySQL-td4023628.html</a></div><div style="margin: 0px; font-size: 12px; font-family: Monaco; color: rgb(255, 38, 0); "><br></div><div style="margin: 0px; font-size: 12px; font-family: Monaco; color: rgb(255, 38, 0); "><span style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; ">Apparently it's got something to do with slidingTime in one rule, but as it does not always occur - am I quite puzzled.</span></div><div style="margin: 0px; font-size: 12px; font-family: Monaco; color: rgb(255, 38, 0); "><span style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; "><br></span></div><div style="margin: 0px; ">Any Ideas or Workarounds?</div><div style="margin: 0px; "><br></div><div style="margin: 0px; ">- Alex</div><div style="margin: 0px; font-size: 12px; font-family: Monaco; color: rgb(255, 38, 0); "><span style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; "><br></span></div><div style="margin: 0px; font-size: 12px; font-family: Monaco; color: rgb(255, 38, 0); "><span style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; "><br></span></div></body></html>