精简项目，取消第三方依赖，如 commons-collections4 ;

doc/XXL-JOB官方文档.md

 - 2、任务告警逻辑调整，改为通过扫描失败日志方式触发。一方面精确扫描失败任务，降低扫描范围；另一方面取消内存队列，降低线程内存消耗；
 - 3、记住密码功能优化，选中时永久记住；非选中时关闭浏览器即登出；
 - 4、项目依赖升级至较新稳定版本，如spring、jackson、groovy等等；
+- 5、精简项目，取消第三方依赖，如 commons-collections4 ;
 - [迭代中]注册中心优化，实时性注册发现：心跳注册间隔10s，refresh失败则首次注册并立即更新注册信息，心跳类似；30s过期销毁；
 - [迭代中]脚本任务，支持数据参数，新版本仅支持单参数不支持需要兼容；
 - [迭代中]提供执行器Docker镜像；

pom.xml

 		<junit.version>4.12</junit.version>
 
 		<commons-exec.version>1.3</commons-exec.version>
-		<commons-collections4.version>4.2</commons-collections4.version>
 		<commons-lang3.version>3.8.1</commons-lang3.version>
 
 		<groovy.version>2.5.5</groovy.version>

xxl-job-admin/pom.xml

 			<version>${mysql-connector-java.version}</version>
 		</dependency>
 
-		<!-- commons-collections4 -->
-		<dependency>
-			<groupId>org.apache.commons</groupId>
-			<artifactId>commons-collections4</artifactId>
-			<version>${commons-collections4.version}</version>
-		</dependency>
 		<!-- commons-lang3 -->
 		<dependency>
 			<groupId>org.apache.commons</groupId>
 		</dependency>
 
 
-
-
 		<!-- quartz ：quartz-2.2.3/c3p0-0.9.1.1/slf4j-api-1.6.6 -->
 		<dependency>
 			<groupId>org.quartz-scheduler</groupId>

xxl-job-admin/src/main/java/com/xxl/job/admin/controller/JobGroupController.java

 import com.xxl.job.admin.core.conf.XxlJobAdminConfig;
 import com.xxl.job.admin.core.model.XxlJobGroup;
 import com.xxl.job.admin.core.model.XxlJobRegistry;
-import com.xxl.job.admin.core.schedule.XxlJobDynamicScheduler;
 import com.xxl.job.admin.core.util.I18nUtil;
 import com.xxl.job.admin.dao.XxlJobGroupDao;
 import com.xxl.job.admin.dao.XxlJobInfoDao;
 import com.xxl.job.core.biz.model.ReturnT;
 import com.xxl.job.core.enums.RegistryConfig;
-import org.apache.commons.collections4.CollectionUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
 			// 0=自动注册
 			List<String> registryList = findRegistryByAppName(xxlJobGroup.getAppName());
 			String addressListStr = null;
-			if (CollectionUtils.isNotEmpty(registryList)) {
+			if (registryList!=null && !registryList.isEmpty()) {
 				Collections.sort(registryList);
 				addressListStr = StringUtils.join(registryList, ",");
 			}

xxl-job-admin/src/main/java/com/xxl/job/admin/core/thread/JobFailMonitorHelper.java

 import com.xxl.job.admin.core.trigger.TriggerTypeEnum;
 import com.xxl.job.admin.core.util.I18nUtil;
 import com.xxl.job.core.biz.model.ReturnT;
-import org.apache.commons.collections4.CollectionUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.mail.javamail.MimeMessageHelper;
 
-import javax.mail.MessagingException;
 import javax.mail.internet.MimeMessage;
-import java.io.UnsupportedEncodingException;
 import java.text.MessageFormat;
 import java.util.Arrays;
 import java.util.HashSet;
 					try {
 
 						List<Integer> failLogIds = XxlJobAdminConfig.getAdminConfig().getXxlJobLogDao().findFailJobLogIds(1000);
-						if (CollectionUtils.isNotEmpty(failLogIds)) {
+						if (failLogIds!=null && !failLogIds.isEmpty()) {
 							for (int failLogId: failLogIds) {
 
 								// lock log

xxl-job-admin/src/main/java/com/xxl/job/admin/core/thread/JobRegistryMonitorHelper.java

 import com.xxl.job.admin.core.conf.XxlJobAdminConfig;
 import com.xxl.job.admin.core.model.XxlJobGroup;
 import com.xxl.job.admin.core.model.XxlJobRegistry;
-import com.xxl.job.admin.core.schedule.XxlJobDynamicScheduler;
 import com.xxl.job.core.enums.RegistryConfig;
-import org.apache.commons.collections4.CollectionUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 					try {
 						// auto registry group
 						List<XxlJobGroup> groupList = XxlJobAdminConfig.getAdminConfig().getXxlJobGroupDao().findByAddressType(0);
-						if (CollectionUtils.isNotEmpty(groupList)) {
+						if (groupList!=null && !groupList.isEmpty()) {
 
 							// remove dead address (admin/executor)
 							XxlJobAdminConfig.getAdminConfig().getXxlJobRegistryDao().removeDead(RegistryConfig.DEAD_TIMEOUT);
 							for (XxlJobGroup group: groupList) {
 								List<String> registryList = appAddressMap.get(group.getAppName());
 								String addressListStr = null;
-								if (CollectionUtils.isNotEmpty(registryList)) {
+								if (registryList!=null && !registryList.isEmpty()) {
 									Collections.sort(registryList);
 									addressListStr = StringUtils.join(registryList, ",");
 								}

xxl-job-admin/src/main/java/com/xxl/job/admin/core/trigger/XxlJobTrigger.java

 import com.xxl.job.core.enums.ExecutorBlockStrategyEnum;
 import com.xxl.rpc.util.IpUtil;
 import com.xxl.rpc.util.ThrowableUtil;
-import org.apache.commons.collections4.CollectionUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
             }
         }
         if (ExecutorRouteStrategyEnum.SHARDING_BROADCAST==ExecutorRouteStrategyEnum.match(jobInfo.getExecutorRouteStrategy(), null)
-                && CollectionUtils.isNotEmpty(group.getRegistryList()) && shardingParam==null) {
+                && group.getRegistryList()!=null && !group.getRegistryList().isEmpty()
+                && shardingParam==null) {
             for (int i = 0; i < group.getRegistryList().size(); i++) {
                 processTrigger(group, jobInfo, finalFailRetryCount, triggerType, i, group.getRegistryList().size());
             }
         // 3、init address
         String address = null;
         ReturnT<String> routeAddressResult = null;
-        if (CollectionUtils.isNotEmpty(group.getRegistryList())) {
+        if (group.getRegistryList()!=null && !group.getRegistryList().isEmpty()) {
             if (ExecutorRouteStrategyEnum.SHARDING_BROADCAST == executorRouteStrategyEnum) {
                 if (index < group.getRegistryList().size()) {
                     address = group.getRegistryList().get(index);

xxl-job-admin/src/main/java/com/xxl/job/admin/service/impl/XxlJobServiceImpl.java

 import com.xxl.job.core.biz.model.ReturnT;
 import com.xxl.job.core.enums.ExecutorBlockStrategyEnum;
 import com.xxl.job.core.glue.GlueTypeEnum;
-import org.apache.commons.collections4.CollectionUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.commons.lang3.time.DateUtils;
 import org.apache.commons.lang3.time.FastDateFormat;
 		Set<String> executerAddressSet = new HashSet<String>();
 		List<XxlJobGroup> groupList = xxlJobGroupDao.findAll();
 
-		if (CollectionUtils.isNotEmpty(groupList)) {
+		if (groupList!=null && !groupList.isEmpty()) {
 			for (XxlJobGroup group: groupList) {
-				if (CollectionUtils.isNotEmpty(group.getRegistryList())) {
+				if (group.getRegistryList()!=null && !group.getRegistryList().isEmpty()) {
 					executerAddressSet.addAll(group.getRegistryList());
 				}
 			}
 		int triggerCountFailTotal = 0;
 
 		List<Map<String, Object>> triggerCountMapAll = xxlJobLogDao.triggerCountByDay(startDate, endDate);
-		if (CollectionUtils.isNotEmpty(triggerCountMapAll)) {
+		if (triggerCountMapAll!=null && triggerCountMapAll.size()>0) {
 			for (Map<String, Object> item: triggerCountMapAll) {
 				String day = String.valueOf(item.get("triggerDay"));
 				int triggerDayCount = Integer.valueOf(String.valueOf(item.get("triggerDayCount")));