'Java returns cannont invoke ScriptEngine error

I am running Java's ScriptEngine class to run to some code. I use IntelliJ with maven dependencies when I run the code it says

Cannot invoke "javax.script.ScriptEngine.eval(String)" because "this.engine" is null
    at Run.Evaluater.<init>(Evaluater.java:19)

the code at line being the following

engine.put("event", event);
engine.put("content", message);

This is how I initiated the ScriptEngone

    public ScriptEngineManager man = new ScriptEngineManager();
    public ScriptEngine engine = man.getEngineByName("nashorn");
javascriptjavascriptengine


Solution 1:[1]

This error was encountered when a project was cloned from the code cloud when it was running. This part of the content is about the loading of the verification code. I did not understand the reason but it was a version problem. Change the JDK version from The problem is solved when 13 is reduced to 8.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Gayan Chinthaka

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