Thanks for the reply Davide . drool and Guvnor version is 5.2.0.FINAL . Please find below the FACT model package com.etrade.jws.actimize.ki; import java.io.Serializable; import java.util.Date; import java.util.HashMap; import java.util.HashSet; import java.util.Map; import java.util.Set; public class LoginChallengeKI implements Serializable { /** * */ private static final long serialVersionUID = 1L; private Integer userEquityBalance; private String foreignUserFlag; private String csgUserFlag; private Short avgRiskScore; private Integer numLogin; private String userLang1; private String userLang2; private String httpLang1; private String httpLang2; private String geoCity1; private String geoCity2; private String geoCountry1; private String geoCountry2; private String ipAddr1; private String ipAddr2; private String cookie1; private String cookie2; private String flashCookie1; private String flashCookie2; private Short lastChgEmailDays; private Short lastChgAddrDays; private Short lastChgPasswdDays; private Short lastFailedLoginDays; private Integer numAfterHrTrades; private Integer numPreOpenTrades; private Set<String> validCookies = new HashSet<String>(); private boolean hadPreviousChallenge; private String WS_EventType; private String WS_UserID; private String WS_LoginName; private String WS_SessionID; private String WS_ChannelInd; private String WS_Cookie; private Integer WS_CookieAge; private String WS_FlashCookie; private String WS_IPAddr; private String WS_UserAgent; private String WS_DevicePrint; private String WS_HttpLang; private String WS_UserLang; private String WS_AuthenMeth; private String WS_AuthenLevel; private String WS_AuthenStatus; private String WS_GeoCountry; private String WS_GeoRegion; private String WS_GeoCity; private String WS_GeoPostlCd; private String WS_GeoConnSpeed; // private String WS_MetroCd; // private String WS_Latitude; // private String WS_Longitude; private Short WS_RiskScore; private String WS_ActionCode; private Date WS_EventTimeStamp; private String WS_RiskScoreEvalFlag; private boolean generateAlert; private boolean challenge; private Map<String, String> ruleIDMap = new HashMap<String, String>(); private String txID; public void setRuleIDMapValue(String ruleID, String ruleName) { this.ruleIDMap.put(ruleID, ruleName); } public LoginChallengeKI() { } public Integer getUserEquityBalance() { return userEquityBalance; } public void setUserEquityBalance(Integer userEquityBalance) { this.userEquityBalance = userEquityBalance; } public String getForeignUserFlag() { return foreignUserFlag; } public void setForeignUserFlag(String foreignUserFlag) { this.foreignUserFlag = foreignUserFlag; } public String getCsgUserFlag() { return csgUserFlag; } public void setCsgUserFlag(String csgUserFlag) { this.csgUserFlag = csgUserFlag; } public Short getAvgRiskScore() { return avgRiskScore; } public void setAvgRiskScore(Short avgRiskScore) { this.avgRiskScore = avgRiskScore; } public Integer getNumLogin() { return numLogin; } public void setNumLogin(Integer numLogin) { this.numLogin = numLogin; } public String getUserLang1() { return userLang1; } public void setUserLang1(String userLang1) { this.userLang1 = userLang1; } public String getUserLang2() { return userLang2; } public void setUserLang2(String userLang2) { this.userLang2 = userLang2; } public String getHttpLang1() { return httpLang1; } public void setHttpLang1(String httpLang1) { this.httpLang1 = httpLang1; } public String getHttpLang2() { return httpLang2; } public void setHttpLang2(String httpLang2) { this.httpLang2 = httpLang2; } public String getGeoCity1() { return geoCity1; } public void setGeoCity1(String geoCity1) { this.geoCity1 = geoCity1; } public String getGeoCity2() { return geoCity2; } public void setGeoCity2(String geoCity2) { this.geoCity2 = geoCity2; } public String getGeoCountry1() { return geoCountry1; } public void setGeoCountry1(String geoCountry1) { this.geoCountry1 = geoCountry1; } public String getGeoCountry2() { return geoCountry2; } public void setGeoCountry2(String geoCountry2) { this.geoCountry2 = geoCountry2; } public String getIpAddr1() { return ipAddr1; } public void setIpAddr1(String ipAddr1) { this.ipAddr1 = ipAddr1; } public String getIpAddr2() { return ipAddr2; } public void setIpAddr2(String ipAddr2) { this.ipAddr2 = ipAddr2; } public String getCookie1() { return cookie1; } public void setCookie1(String cookie1) { this.cookie1 = cookie1; } public String getCookie2() { return cookie2; } public void setCookie2(String cookie2) { this.cookie2 = cookie2; } public String getFlashCookie1() { return flashCookie1; } public void setFlashCookie1(String flashCookie1) { this.flashCookie1 = flashCookie1; } public String getFlashCookie2() { return flashCookie2; } public void setFlashCookie2(String flashCookie2) { this.flashCookie2 = flashCookie2; } public Short getLastChgEmailDays() { return lastChgEmailDays; } public void setLastChgEmailDays(Short lastChgEmailDays) { this.lastChgEmailDays = lastChgEmailDays; } public Short getLastChgAddrDays() { return lastChgAddrDays; } public void setLastChgAddrDays(Short lastChgAddrDays) { this.lastChgAddrDays = lastChgAddrDays; } public Short getLastChgPasswdDays() { return lastChgPasswdDays; } public void setLastChgPasswdDays(Short lastChgPasswdDays) { this.lastChgPasswdDays = lastChgPasswdDays; } public Short getLastFailedLoginDays() { return lastFailedLoginDays; } public void setLastFailedLoginDays(Short lastFailedLoginDays) { this.lastFailedLoginDays = lastFailedLoginDays; } public Integer getNumAfterHrTrades() { return numAfterHrTrades; } public void setNumAfterHrTrades(Integer numAfterHrTrades) { this.numAfterHrTrades = numAfterHrTrades; } public Integer getNumPreOpenTrades() { return numPreOpenTrades; } public void setNumPreOpenTrades(Integer numPreOpenTrades) { this.numPreOpenTrades = numPreOpenTrades; } public String getWS_UserID() { return WS_UserID; } public void setWS_UserID(String wS_UserID) { WS_UserID = wS_UserID; } public String getWS_LoginName() { return WS_LoginName; } public void setWS_LoginName(String wS_LoginName) { WS_LoginName = wS_LoginName; } public String getWS_ChannelInd() { return WS_ChannelInd; } public void setWS_ChannelInd(String wS_ChannelInd) { WS_ChannelInd = wS_ChannelInd; } public String getWS_Cookie() { return WS_Cookie; } public void setWS_Cookie(String wS_Cookie) { WS_Cookie = wS_Cookie; } public String getWS_FlashCookie() { return WS_FlashCookie; } public void setWS_FlashCookie(String wS_FlashCookie) { WS_FlashCookie = wS_FlashCookie; } public String getWS_IPAddr() { return WS_IPAddr; } public void setWS_IPAddr(String wS_IPAddr) { WS_IPAddr = wS_IPAddr; } public String getWS_HttpLang() { return WS_HttpLang; } public void setWS_HttpLang(String wS_HttpLang) { WS_HttpLang = wS_HttpLang; } public String getWS_UserLang() { return WS_UserLang; } public void setWS_UserLang(String wS_UserLang) { WS_UserLang = wS_UserLang; } public String getWS_GeoCountry() { return WS_GeoCountry; } public void setWS_GeoCountry(String wS_GeoCountry) { WS_GeoCountry = wS_GeoCountry; } public String getWS_GeoRegion() { return WS_GeoRegion; } public void setWS_GeoRegion(String wS_GeoRegion) { WS_GeoRegion = wS_GeoRegion; } public String getWS_GeoCity() { return WS_GeoCity; } public void setWS_GeoCity(String wS_GeoCity) { WS_GeoCity = wS_GeoCity; } public String getWS_GeoPostlCd() { return WS_GeoPostlCd; } public void setWS_GeoPostlCd(String wS_GeoPostlCd) { WS_GeoPostlCd = wS_GeoPostlCd; } public Short getWS_RiskScore() { return WS_RiskScore; } public void setWS_RiskScore(Short wS_RiskScore) { WS_RiskScore = wS_RiskScore; } public Date getWS_EventTimeStamp() { return WS_EventTimeStamp; } public void setWS_EventTimeStamp(Date wS_EventTimeStamp) { WS_EventTimeStamp = wS_EventTimeStamp; } public String getWS_RiskScoreEvalFlag() { return WS_RiskScoreEvalFlag; } public void setWS_RiskScoreEvalFlag(String wS_RiskScoreEvalFlag) { WS_RiskScoreEvalFlag = wS_RiskScoreEvalFlag; } public boolean isChallenge() { return challenge; } public void setChallenge(boolean challenge) { this.challenge = challenge; } public Map<String, String> getRuleIDMap() { return ruleIDMap; } public void setRuleIDMap(Map<String, String> ruleIDMap) { this.ruleIDMap = ruleIDMap; } public String getWS_EventType() { return WS_EventType; } public void setWS_EventType(String wS_EventType) { WS_EventType = wS_EventType; } public String getWS_UserAgent() { return WS_UserAgent; } public void setWS_UserAgent(String wS_UserAgent) { WS_UserAgent = wS_UserAgent; } public String getWS_DevicePrint() { return WS_DevicePrint; } public void setWS_DevicePrint(String wS_DevicePrint) { WS_DevicePrint = wS_DevicePrint; } public String getWS_AuthenMeth() { return WS_AuthenMeth; } public void setWS_AuthenMeth(String wS_AuthenMeth) { WS_AuthenMeth = wS_AuthenMeth; } public String getWS_AuthenLevel() { return WS_AuthenLevel; } public void setWS_AuthenLevel(String wS_AuthenLevel) { WS_AuthenLevel = wS_AuthenLevel; } public String getWS_AuthenStatus() { return WS_AuthenStatus; } public void setWS_AuthenStatus(String wS_AuthenStatus) { WS_AuthenStatus = wS_AuthenStatus; } public String getWS_GeoConnSpeed() { return WS_GeoConnSpeed; } public void setWS_GeoConnSpeed(String wS_GeoConnSpeed) { WS_GeoConnSpeed = wS_GeoConnSpeed; } public String getWS_ActionCode() { return WS_ActionCode; } public void setWS_ActionCode(String wS_ActionCode) { WS_ActionCode = wS_ActionCode; } public Set<String> getValidCookies() { return validCookies; } public void setValidCookies(Set<String> validCookies) { this.validCookies = validCookies; } public String getTxID() { return txID; } public void setTxID(String txID) { this.txID = txID; } public String getWS_SessionID() { return WS_SessionID; } public void setWS_SessionID(String wS_SessionID) { WS_SessionID = wS_SessionID; } public Integer getWS_CookieAge() { return WS_CookieAge; } public void setWS_CookieAge(Integer wS_CookieAge) { WS_CookieAge = wS_CookieAge; } public boolean isHadPreviousChallenge() { return hadPreviousChallenge; } public void setHadPreviousChallenge(boolean hadPreviousChallenge) { this.hadPreviousChallenge = hadPreviousChallenge; } public boolean isGenerateAlert() { return generateAlert; } public void setGenerateAlert(boolean generateAlert) { this.generateAlert = generateAlert; } @Override public String toString() { return "LoginChallengeKI [userEquityBalance=" + userEquityBalance + ", foreignUserFlag=" + foreignUserFlag + ", csgUserFlag=" + csgUserFlag + ", avgRiskScore=" + avgRiskScore + ", numLogin=" + numLogin + ", userLang1=" + userLang1 + ", userLang2=" + userLang2 + ", httpLang1=" + httpLang1 + ", httpLang2=" + httpLang2 + ", geoCity1=" + geoCity1 + ", geoCity2=" + geoCity2 + ", geoCountry1=" + geoCountry1 + ", geoCountry2=" + geoCountry2 + ", ipAddr1=" + ipAddr1 + ", ipAddr2=" + ipAddr2 + ", cookie1=" + cookie1 + ", cookie2=" + cookie2 + ", flashCookie1=" + flashCookie1 + ", flashCookie2=" + flashCookie2 + ", lastChgEmailDays=" + lastChgEmailDays + ", lastChgAddrDays=" + lastChgAddrDays + ", lastChgPasswdDays=" + lastChgPasswdDays + ", lastFailedLoginDays=" + lastFailedLoginDays + ", numAfterHrTrades=" + numAfterHrTrades + ", numPreOpenTrades=" + numPreOpenTrades + ", validCookies=" + validCookies + ", hadPreviousChallenge=" + hadPreviousChallenge + ", WS_EventType=" + WS_EventType + ", WS_UserID=" + WS_UserID + ", WS_LoginName=" + WS_LoginName + ", WS_SessionID=" + WS_SessionID + ", WS_ChannelInd=" + WS_ChannelInd + ", WS_Cookie=" + WS_Cookie + ", WS_CookieAge=" + WS_CookieAge + ", WS_FlashCookie=" + WS_FlashCookie + ", WS_IPAddr=" + WS_IPAddr + ", WS_UserAgent=" + WS_UserAgent + ", WS_DevicePrint=" + WS_DevicePrint + ", WS_HttpLang=" + WS_HttpLang + ", WS_UserLang=" + WS_UserLang + ", WS_AuthenMeth=" + WS_AuthenMeth + ", WS_AuthenLevel=" + WS_AuthenLevel + ", WS_AuthenStatus=" + WS_AuthenStatus + ", WS_GeoCountry=" + WS_GeoCountry + ", WS_GeoRegion=" + WS_GeoRegion + ", WS_GeoCity=" + WS_GeoCity + ", WS_GeoPostlCd=" + WS_GeoPostlCd + ", WS_GeoConnSpeed=" + WS_GeoConnSpeed + ", WS_RiskScore=" + WS_RiskScore + ", WS_ActionCode=" + WS_ActionCode + ", WS_EventTimeStamp=" + WS_EventTimeStamp + ", WS_RiskScoreEvalFlag=" + WS_RiskScoreEvalFlag + ", generateAlert=" + generateAlert + ", challenge=" + challenge + ", ruleIDMap=" + ruleIDMap + ", txID=" + txID + "]"; } } -- View this message in context: http://drools.46999.n3.nabble.com/java-lang-NullPointerException-at-org-d... 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Thanks Vincent .I did tried the rule after replacing the getter on the fact object . Still the same issue . Rule works fine when other application starts up and continue to work unless rule is modified in the guvnor . I am using drool spring integration for automatic reloading of the rules from guvnor . As soon i made any change in the guvnor rule and rule is refreshed in the other application it starts throwing npe when rule is evaluated . below is the my drool spirng config . <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:drools="http://drools.org/schema/drools-spring" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://drools.org/schema/drools-spring http://drools.org/schema/drools-spring-1.3.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd" default-autowire="byName"> <drools:kbase id="kbase1" /> <drools:kagent id="kagent1" kbase="kbase1" new-instance="false"> <drools:resources> <drools:resource type="PKG" source="http://sit135w86m7.etrade.com/org.drools.guvnor.Guvnor/packa... basic-authentication="enabled" username="admin" password="admin" /> </drools:resources> </drools:kagent> <bean class="org.springframework.beans.factory.config.MethodInvokingFactoryBean"> <property name="targetObject"> <bean class="org.springframework.beans.factory.config.MethodInvokingFactoryBean"> <property name="targetClass" value="java.lang.System" /> <property name="targetMethod" value="getProperties" /> </bean> </property> <property name="targetMethod" value="putAll" /> <property name="arguments"> <util:properties> <prop key="drools.resource.urlcache">#{systemEnvironment['CATALINA_BASE']}/conf</prop> </util:properties> </property> </bean> <drools:ksession id="ksession1" type="stateful" kbase="kbase1" /> <bean id="ruleServiceImpl" class="com.etrade.jws.actimize.rule.RuleServiceImpl"> <property name="ksession" ref="ksession1" /> <property name="kbase" ref="kbase1" /> </bean> <drools:resource-change-scanner id="scanner" interval="60" /> <bean class="com.etrade.jws.actimize.rule.ResourceChangeScannerStarter" depends-on="scanner" /> </beans> -- View this message in context: http://drools.46999.n3.nabble.com/java-lang-NullPointerException-at-org-d... Sent from the Drools: User forum mailing list archive at Nabble.com.