法兰连接双偏心蝶阀

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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: ${topYzQuestOne.title!""} [in template "b2b.ftl" at line 495, column 35] ---- Java stack trace (for programmers): ---- freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...] at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:131) at freemarker.core.UnexpectedTypeException.newDesciptionBuilder(UnexpectedTypeException.java:77) at freemarker.core.UnexpectedTypeException.(UnexpectedTypeException.java:40) at freemarker.core.NonHashException.(NonHashException.java:46) at freemarker.core.Dot._eval(Dot.java:45) at freemarker.core.Expression.eval(Expression.java:78) at freemarker.core.DefaultToExpression._eval(DefaultToExpression.java:80) at freemarker.core.Expression.eval(Expression.java:78) at freemarker.core.Expression.evalAndCoerceToString(Expression.java:82) at freemarker.core.DollarVariable.accept(DollarVariable.java:41) at freemarker.core.Environment.visit(Environment.java:324) at freemarker.core.MixedContent.accept(MixedContent.java:54) at freemarker.core.Environment.visit(Environment.java:324) at freemarker.core.Environment.process(Environment.java:302) at freemarker.template.Template.process(Template.java:325) at com.concom.staticize.util.FreeMarkertUtil.analysisTemplate(FreeMarkertUtil.java:57) at com.concom.staticize.job.task.yunying.b2b.B2bKeywordTask.b2bCreate(B2bKeywordTask.java:305) at com.concom.staticize.job.task.yunying.b2b.B2bKeywordTask.calc(B2bKeywordTask.java:271) at com.concom.staticize.job.task.yunying.b2b.B2bKeywordTask.lambda$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)