How to call the java method in when in drools rule file

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To declare the variable $op: OP ()

Dialect "java"

Import com.topnet.ruleengine.bean.OP

Import com.topnet.ruleengine.op.Executor

Rule "test"

When

$op: OP ()

Eval (Executor.abc ($op) > 0)

Then

System.out.println ("test")

End

Official documents:

Https://docs.jboss.org/drools/release/6.2.0.CR3/drools-docs/html/DroolsLanguageReferenceChapter.html#d0e7455

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