Elasticsearch7.x plug-in failed to load local so library file。

Question

I developed an analyzer plug-in. The plug-in uses a C language so library file, but when I call the plug-in word segmentation, the local library link fails.

Caused by: 
 java.lang.UnsatisfiedLinkError:   
 com.***.JNIWrapper.seg_segment(Ljava/lang/String;IZZLjava/lang/String;)Ljava/lang/String;

Caused by: 
org.elasticsearch.ElasticsearchException: failed to analyze;

I've tried the following in the plugin's plugin-security.policy file:

grant codeBase 
   "/opt/elasticsearch/elasticsearch-7.1.0/plugins/analysis-plugin/plugin.jar" 
    {
    permission java.security.AllPermission;
    permission java.lang.RuntimePermission "createClassLoader";
    permission java.lang.RuntimePermission "getProtectionDomain";
    permission java.lang.RuntimePermission "getClassLoader";
    permission java.io.FilePermission
    "/opt/elasticsearch/elasticsearch-7.1.0/plugins/analysis-     
     plugin/Linux-amd64-64/lib.so", "read";
   };

But this doesn't work.

Answer 1

I solved my problem by "AccessController.doPrivileged" and thank you guys.