我正在尝试使用report?is_odd_item查看循环中的索引是否为奇数，这会给我以下错误：
SEVERE: Template processing error: "Error parsing included template sections/reports.ftl\nError on line 4, column 42, in template sections/reports.ftl\nFound is_odd_item, expecting one of: is_directive, parent, js_string, j_string, uncap_first, is_transform, number, is_hash, trim, children, has_content, iso_ms, xml, iso_utc, byte, double, left_pad, json_string, matches, capitalize, number_to_datetime, contains, size, iso_local_h_nz, iso_utc_ms, iso_local_m_nz, is_collection, long, default, iso_utc_h_nz, iso_local_ms, is_boolean, last_index_of, c, iso_utc_m_nz, is_macro, rtf, iso_utc_nz, upper_case, node_name, reverse, cap_first, url, is_hash_ex, iso_nz, is_enumerable, exists, number_to_date, first, iso_local, date, iso, replace, float, right_pad, datetime, node_type, split, iso_ms_nz, number_to_time, is_sequence, iso_utc_m, html, ancestors, iso_utc_h, iso_local_ms_nz, new, last, sort, eval, lower_case, web_safe, is_date, is_string, iso_local_nz, word_list, seq_last_index_of, node_namespace, string, keys, iso_m_nz, values, seq_index_of, chunk, sort_by, iso_m, starts_with, substring, index_of, iso_h, root, floor, iso_h_nz, ceiling, if_exists, chop_linebreak, iso_local_h, length, is_indexable, groups, is_node, iso_local_m, int, iso_utc_ms_nz, xhtml, ends_with, round, interpret, is_method, namespace, short, seq_contains, time, is_number in sections/reports.ftl"
Error parsing included template sections/reports.ftl
Error on line 4, column 42, in template sections/reports.ftl
Found is_odd_item, expecting one of: is_directive, parent, js_string, j_string, uncap_first, is_transform, number, is_hash, trim, children, has_content, iso_ms, xml, iso_utc, byte, double, left_pad, json_string, matches, capitalize, number_to_datetime, contains, size, iso_local_h_nz, iso_utc_ms, iso_local_m_nz, is_collection, long, default, iso_utc_h_nz, iso_local_ms, is_boolean, last_index_of, c, iso_utc_m_nz, is_macro, rtf, iso_utc_nz, upper_case, node_name, reverse, cap_first, url, is_hash_ex, iso_nz, is_enumerable, exists, number_to_date, first, iso_local, date, iso, replace, float, right_pad, datetime, node_type, split, iso_ms_nz, number_to_time, is_sequence, iso_utc_m, html, ancestors, iso_utc_h, iso_local_ms_nz, new, last, sort, eval, lower_case, web_safe, is_date, is_string, iso_local_nz, word_list, seq_last_index_of, node_namespace, string, keys, iso_m_nz, values, seq_index_of, chunk, sort_by, iso_m, starts_with, substring, index_of, iso_h, root, floor, iso_h_nz, ceiling, if_exists, chop_linebreak, iso_local_h, length, is_indexable, groups, is_node, iso_local_m, int, iso_utc_ms_nz, xhtml, ends_with, round, interpret, is_method, namespace, short, seq_contains, time, is_number in sections/reports.ftl
The problematic instruction:
----------
==> include sections[section] [on line 16, column 17 in layout.ftl]
----------
Java backtrace for programmers:
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freemarker.template.TemplateException: Error parsing included template sections/reports.ftl
Error on line 4, column 42, in template sections/reports.ftl
Found is_odd_item, expecting one of: is_directive, parent, js_string, j_string, uncap_first, is_transform, number, is_hash, trim, children, has_content, iso_ms, xml, iso_utc, byte, double, left_pad, json_string, matches, capitalize, number_to_datetime, contains, size, iso_local_h_nz, iso_utc_ms, iso_local_m_nz, is_collection, long, default, iso_utc_h_nz, iso_local_ms, is_boolean, last_index_of, c, iso_utc_m_nz, is_macro, rtf, iso_utc_nz, upper_case, node_name, reverse, cap_first, url, is_hash_ex, iso_nz, is_enumerable, exists, number_to_date, first, iso_local, date, iso, replace, float, right_pad, datetime, node_type, split, iso_ms_nz, number_to_time, is_sequence, iso_utc_m, html, ancestors, iso_utc_h, iso_local_ms_nz, new, last, sort, eval, lower_case, web_safe, is_date, is_string, iso_local_nz, word_list, seq_last_index_of, node_namespace, string, keys, iso_m_nz, values, seq_index_of, chunk, sort_by, iso_m, starts_with, substring, index_of, iso_h, root, floor, iso_h_nz, ceiling, if_exists, chop_linebreak, iso_local_h, length, is_indexable, groups, is_node, iso_local_m, int, iso_utc_ms_nz, xhtml, ends_with, round, interpret, is_method, namespace, short, seq_contains, time, is_number in sections/reports.ftl
at freemarker.core.Include.accept(Include.java:162)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:167)
at freemarker.core.Environment.visit(Environment.java:428)
at freemarker.core.IteratorBlock.accept(IteratorBlock.java:102)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.Environment.process(Environment.java:199)
at freemarker.template.Template.process(Template.java:259)
at spark.template.freemarker.FreeMarkerEngine.render(FreeMarkerEngine.java:70)
at spark.TemplateViewRouteImpl$1.render(TemplateViewRouteImpl.java:61)
at spark.TemplateViewRouteImpl$1.render(TemplateViewRouteImpl.java:58)
at spark.TemplateViewRouteImpl.render(TemplateViewRouteImpl.java:86)
at spark.http.matching.Routes.execute(Routes.java:62)
at spark.http.matching.MatcherFilter.doFilter(MatcherFilter.java:128)
at spark.embeddedserver.jetty.JettyHandler.doHandle(JettyHandler.java:50)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:189)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:119)
at org.eclipse.jetty.server.Server.handle(Server.java:517)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:308)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:242)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:261)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:75)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceAndRun(ExecuteProduceConsume.java:213)
at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:147)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:654)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:572)
at java.lang.Thread.run(Thread.java:745)
Caused by: freemarker.core.ParseException: Error on line 4, column 42, in template sections/reports.ftl
Found is_odd_item, expecting one of: is_directive, parent, js_string, j_string, uncap_first, is_transform, number, is_hash, trim, children, has_content, iso_ms, xml, iso_utc, byte, double, left_pad, json_string, matches, capitalize, number_to_datetime, contains, size, iso_local_h_nz, iso_utc_ms, iso_local_m_nz, is_collection, long, default, iso_utc_h_nz, iso_local_ms, is_boolean, last_index_of, c, iso_utc_m_nz, is_macro, rtf, iso_utc_nz, upper_case, node_name, reverse, cap_first, url, is_hash_ex, iso_nz, is_enumerable, exists, number_to_date, first, iso_local, date, iso, replace, float, right_pad, datetime, node_type, split, iso_ms_nz, number_to_time, is_sequence, iso_utc_m, html, ancestors, iso_utc_h, iso_local_ms_nz, new, last, sort, eval, lower_case, web_safe, is_date, is_string, iso_local_nz, word_list, seq_last_index_of, node_namespace, string, keys, iso_m_nz, values, seq_index_of, chunk, sort_by, iso_m, starts_with, substring, index_of, iso_h, root, floor, iso_h_nz, ceiling, if_exists, chop_linebreak, iso_local_h, length, is_indexable, groups, is_node, iso_local_m, int, iso_utc_ms_nz, xhtml, ends_with, round, interpret, is_method, namespace, short, seq_contains, time, is_number in sections/reports.ftl
at freemarker.core.BuiltIn.newBuiltIn(BuiltIn.java:255)
at freemarker.core.FMParser.BuiltIn(FMParser.java:795)
at freemarker.core.FMParser.AddSubExpression(FMParser.java:731)
at freemarker.core.FMParser.PrimaryExpression(FMParser.java:278)
at freemarker.core.FMParser.UnaryExpression(FMParser.java:324)
at freemarker.core.FMParser.MultiplicativeExpression(FMParser.java:440)
at freemarker.core.FMParser.AdditiveExpression(FMParser.java:390)
at freemarker.core.FMParser.RangeExpression(FMParser.java:561)
at freemarker.core.FMParser.RelationalExpression(FMParser.java:516)
at freemarker.core.FMParser.EqualityExpression(FMParser.java:481)
at freemarker.core.FMParser.AndExpression(FMParser.java:590)
at freemarker.core.FMParser.OrExpression(FMParser.java:613)
at freemarker.core.FMParser.Expression(FMParser.java:226)
at freemarker.core.FMParser.If(FMParser.java:1175)
at freemarker.core.FMParser.FreemarkerDirective(FMParser.java:2377)
at freemarker.core.FMParser.Content(FMParser.java:2623)
at freemarker.core.FMParser.OptionalBlock(FMParser.java:2791)
at freemarker.core.FMParser.List(FMParser.java:1262)
at freemarker.core.FMParser.FreemarkerDirective(FMParser.java:2380)
at freemarker.core.FMParser.Content(FMParser.java:2623)
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.core.Environment.getTemplateForInclusion(Environment.java:1490)
at freemarker.core.Include.accept(Include.java:157)
... 32 more
代码：
<#list reports as report>
<p><#if report?is_odd_item>left<#else>right</#if></p>
</#list>
Line 4: <#if report?is_odd_item>>
^ (column 42)
其他涉及的事情？运算符也给我相同的错误，例如${var}?keep_after(".")。
我正在使用Spark版本2.5.4和FreeMarker template engine for Spark版本2.3
答案 0 :(得分：1)
你正在使用一些相当古老的FreeMarker版本。 {2.3}中添加了?is_odd_item。最后一个稳定版本是2.3.25-incubating（其中＆＃34; -cububating＆＃34;与稳定性无关，它是Apache孵化器政策所要求的）。
答案 1 :(得分：1)
您还可以使用item_cycle指令（自版本2.3.23）
<#list reports as report >
<p>${report?item_cycle('left', 'right')}</p>
</#list>
使代码更具可读性。
文档： http://freemarker.org/docs/ref_builtins_loop_var.html#ref_builtin_item_cycle