1、错误描写叙述

freemarker.core.ParseException: Encountered "string" at line 21, column 21 in type.ftl.

Was expecting one of:

    "}" ...

    "." ...

    "[" ...

    "(" ...

    "?" ...

    "!" ...

    <TERMINATING_EXCLAM> ...

    "??" ...

    "+" ...

    "-" ...

    "*" ...

    "/" ...

    "%" ...

    "!=" ...

    "=" ...

    "==" ...

    ">=" ...

    <ESCAPED_GTE> ...

    ">" ...

    <ESCAPED_GT> ...

    <LESS_THAN_EQUALS> ...

    <LESS_THAN> ...

    ".." ...

    <AND> ...

    <OR> ...

	at freemarker.core.FMParser.generateParseException(FMParser.java:4702)

	at freemarker.core.FMParser.jj_consume_token(FMParser.java:4573)

	at freemarker.core.FMParser.StringOutput(FMParser.java:1070)

	at freemarker.core.FMParser.Content(FMParser.java:2580)

	at freemarker.core.FMParser.OptionalBlock(FMParser.java:2791)

	at freemarker.core.FMParser.Root(FMParser.java:2963)

	at freemarker.template.Template.<init>(Template.java:171)

	at freemarker.cache.TemplateCache.loadTemplate(TemplateCache.java:447)

	at freemarker.cache.TemplateCache.getTemplate(TemplateCache.java:360)

	at freemarker.cache.TemplateCache.getTemplate(TemplateCache.java:235)

	at freemarker.template.Configuration.getTemplate(Configuration.java:578)

	at freemarker.template.Configuration.getTemplate(Configuration.java:543)

	at com.you.freemarker.FreemarkerTemplate.getTemplate(FreemarkerTemplate.java:52)

	at com.you.freemarker.FreemarkerTemplate.printFtl(FreemarkerTemplate.java:76)

	at com.you.test.freemarker.FreemarkerTest.studentPrint(FreemarkerTest.java:172)

	at com.you.test.freemarker.FreemarkerTest.testDataType(FreemarkerTest.java:159)

	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

	at java.lang.reflect.Method.invoke(Unknown Source)

	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)

	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)

	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)

	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)

	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)

	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)

	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)

	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)

	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)

	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)

	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)

	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)

	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)

	at org.junit.runners.ParentRunner.run(ParentRunner.java:300)

	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)

	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)

	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)

	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)

	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

2、错误原因

 ${(num.color)??string}

“？？”出现错误，不符合freemarker中的语法规定

3、解决的方法

将“？？”改动成符合freemarker语法的“？？？”

${(num.color)???string}

结果：false