elasticsearch 热更新-mysql远程实现异常处理_access denied ("java.lang.runtimepermission" "setc

一.报错异常：

Caused by: java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "setContextClassLoader")

二.开发环境：

elasticsearch 7.15.2 

java 1.8.0.291

mysql 8.0.26

具体异常如下：

fatal error in thread [elasticsearch[ZBMac-C02ZQ3T41.local][clusterApplierService#updateTask][T#1]], exiting
java.lang.ExceptionInInitializerError
	at java.base/java.lang.Class.forName0(Native Method)
	at java.base/java.lang.Class.forName(Class.java:375)
	at com.mysql.cj.jdbc.NonRegisteringDriver.<clinit>(NonRegisteringDriver.java:98)
	at java.base/java.lang.Class.forName0(Native Method)
	at java.base/java.lang.Class.forName(Class.java:375)
	at org.wltea.analyzer.dic.Dictionary.<clinit>(Dictionary.java:106)
	at org.wltea.analyzer.cfg.Configuration.<init>(Configuration.java:40)
	at org.elasticsearch.index.analysis.IkTokenizerFactory.<init>(IkTokenizerFactory.java:15)
	at org.elasticsearch.index.analysis.IkTokenizerFactory.getIkSmartTokenizerFactory(IkTokenizerFactory.java:23)
	at org.elasticsearch.index.analysis.AnalysisRegistry.buildMapping(AnalysisRegistry.java:433)
	at org.elasticsearch.index.analysis.AnalysisRegistry.buildTokenizerFactories(AnalysisRegistry.java:275)
	at org.elasticsearch.index.analysis.AnalysisRegistry.build(AnalysisRegistry.java:203)
	at org.elasticsearch.index.IndexModule.newIndexService(IndexModule.java:429)
	at org.elasticsearch.indices.IndicesService.createIndexService(IndicesService.java:671)
	at org.elasticsearch.indices.IndicesService.createIndex(IndicesService.java:574)
	at org.elasticsearch.indices.IndicesService.createIndex(IndicesService.java:175)
	at org.elasticsearch.indices.cluster.IndicesClusterStateService.createIndices(IndicesClusterStateService.java:468)
	at org.elasticsearch.indices.cluster.IndicesClusterStateService.applyClusterState(IndicesClusterStateService.java:227)
	at org.elasticsearch.cluster.service.ClusterApplierService.callClusterStateAppliers(ClusterApplierService.java:500)
	at org.elasticsearch.cluster.service.ClusterApplierService.callClusterStateAppliers(ClusterApplierService.java:490)
	at org.elasticsearch.cluster.service.ClusterApplierService.applyChanges(ClusterApplierService.java:461)
	at org.elasticsearch.cluster.service.ClusterApplierService.runTask(ClusterApplierService.java:408)
	at org.elasticsearch.cluster.service.ClusterApplierService.access$000(ClusterApplierService.java:57)
	at org.elasticsearch.cluster.service.ClusterApplierService$UpdateTask.run(ClusterApplierService.java:152)
	at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:678)
	at org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.runAndClean(PrioritizedEsThreadPoolExecutor.java:259)
	at org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.run(PrioritizedEsThreadPoolExecutor.java:222)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "setContextClassLoader")
	at java.base/java.security.AccessControlContext.checkPermission(AccessControlContext.java:485)
	at java.base/java.security.AccessController.checkPermission(AccessController.java:1068)
	at java.base/java.lang.SecurityManager.checkPermission(SecurityManager.java:416)
	at java.base/java.lang.Thread.setContextClassLoader(Thread.java:1525)
	at com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.lambda$static$0(AbandonedConnectionCleanupThread.java:77)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.<init>(ThreadPoolExecutor.java:630)
	at java.base/java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:920)
	at java.base/java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1353)
	at java.base/java.util.concurrent.Executors$DelegatedExecutorService.execute(Executors.java:721)
	at com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.<clinit>(AbandonedConnectionCleanupThread.java:80)
	... 30 more

三.解决方案：

方案一：修改jdk 安全策略，即修改 java.policy文件。部分版本不支持,会修改无效，因此建议第二种。 

方案二：修改es下的安全策略,进入es目录 config下新建 policy.policy文件

方案一明细：

        1.进入jdk安装目录（mac 环境）

/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home/jre/lib/security

不知道自己mac 的jdk安装在哪的，使用下面命令

/usr/libexec/java_home -V

 2.找到java.policy文件,在最下面增加

permission java.net.SocketPermission "*:*","connect,resolve";
permission java.lang.RuntimePermission "getClassLoader"; 
permission java.lang.RuntimePermission "setContextClassLoader";

如果没有权限修改java.policy文件的话，需要赋权(右键文件-显示简介-给当前用户增加权限)

3. 重启es即可。 

方案二明细：

1. es安装目录 config 下新建 policy.policy文件，添加如下内容

grant {
	permission java.net.SocketPermission "*:*","connect,resolve";
	permission java.lang.RuntimePermission "getClassLoader"; 
    permission java.lang.RuntimePermission "setContextClassLoader"; 
};

2.修改jvm.option文件增加

-Djava.security.policy=你的es安装目录/config/policy.policy

3.重启es即可。

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