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    FreeMarker template error (DEBUG mode; use RETHROW in production!): The following has evaluated to null or missing: ==> data [in template "b2b.ftl" at line 320, column 22] ---- Tip: If the failing expression is known to be legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)?? ---- ---- FTL stack trace ("~" means nesting-related): - Failed at: #if data.result?? [in template "b2b.ftl" at line 320, column 17] ---- Java stack trace (for programmers): ---- freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...] at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:131) at freemarker.core.UnexpectedTypeException.newDesciptionBuilder(UnexpectedTypeException.java:77) at freemarker.core.UnexpectedTypeException.(UnexpectedTypeException.java:40) at freemarker.core.NonHashException.(NonHashException.java:46) at freemarker.core.Dot._eval(Dot.java:45) at freemarker.core.Expression.eval(Expression.java:78) at freemarker.core.ExistsExpression._eval(ExistsExpression.java:45) at freemarker.core.Expression.eval(Expression.java:78) at freemarker.core.Expression.evalToBoolean(Expression.java:124) at freemarker.core.Expression.evalToBoolean(Expression.java:110) at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:46) at freemarker.core.Environment.visit(Environment.java:324) at freemarker.core.MixedContent.accept(MixedContent.java:54) at freemarker.core.Environment.visit(Environment.java:324) at freemarker.core.Environment.process(Environment.java:302) at freemarker.template.Template.process(Template.java:325) at com.concom.staticize.util.FreeMarkertUtil.analysisTemplate(FreeMarkertUtil.java:57) at com.concom.staticize.job.task.yunying.b2b.B2bKeywordTask.b2bCreate(B2bKeywordTask.java:305) at com.concom.staticize.job.task.yunying.b2b.B2bKeywordTask.calc(B2bKeywordTask.java:271) at com.concom.staticize.job.task.yunying.b2b.B2bKeywordTask.lambda$null$0(B2bKeywordTask.java:246) at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1604) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:750)