1、错误描述
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、解决办法
将“？？”修改成符合freemarker语法的“？？？”
${(num.color)???string}
结果：false
4，原因
前连个问号是判断是否存在，后面一个问号是让它以String的类型输出