!148 删除不必要的代码

Merge pull request !148 from 蛇妖/dev

liteflow-script-plugin/liteflow-script-graaljs/src/main/java/com/yomahub/liteflow/script/graaljs/GraalJavaScriptExecutor.java

@@ -14,9 +14,6 @@ import org.graalvm.polyglot.Context;
 import org.graalvm.polyglot.Engine;
 import org.graalvm.polyglot.Source;
 import org.graalvm.polyglot.Value;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 import java.util.Map;
 
 /**
@@ -26,8 +23,6 @@ import java.util.Map;
  */
 public class GraalJavaScriptExecutor implements ScriptExecutor {
 
-    private final Logger log = LoggerFactory.getLogger(this.getClass());
-
     private final Map<String, Source> scriptMap = new CopyOnWriteHashMap<>();
 
     private Engine engine;