freemarker自定义标签报错（七）

1、错误描述

六月 09, 2014 11:11:09 下午 freemarker.log.JDK14LoggerFactory$JDK14Logger error严重: Template processing error: "Expression a is undefined on line 27, column 23 in tag.ftl."Expression a is undefined on line 27, column 23 in tag.ftl.The problematic instruction:----------==> ${a} [on line 27, column 21 in tag.ftl] in user-directive tag [on line 25, column 6 in tag.ftl]----------Java backtrace for programmers:----------freemarker.core.InvalidReferenceException: Expression a is undefined on line 27, column 23 in tag.ftl.at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:125)at freemarker.core.Expression.getStringValue(Expression.java:118)at freemarker.core.Expression.getStringValue(Expression.java:93)at freemarker.core.DollarVariable.accept(DollarVariable.java:76)at freemarker.core.Environment.visit(Environment.java:221)at freemarker.core.MixedContent.accept(MixedContent.java:92)at freemarker.core.Environment.visit(Environment.java:221)at freemarker.core.Environment.visit(Environment.java:406)at freemarker.core.BodyInstruction.accept(BodyInstruction.java:93)at freemarker.core.Environment.visit(Environment.java:221)at freemarker.core.MixedContent.accept(MixedContent.java:92)at freemarker.core.Environment.visit(Environment.java:221)at freemarker.core.Macro$Context.runMacro(Macro.java:172)at freemarker.core.Environment.visit(Environment.java:614)at freemarker.core.UnifiedCall.accept(UnifiedCall.java:106)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 com.you.freemarker.FreemarkerTemplate.printFtl(FreemarkerTemplate.java:77)at com.you.test.freemarker.FreemarkerTest.studentPrint(FreemarkerTest.java:224)at com.you.test.freemarker.FreemarkerTest.testTag(FreemarkerTest.java:211)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)Expression a is undefined on line 27, column 23 in tag.ftl.The problematic instruction:----------==> ${a} [on line 27, column 21 in tag.ftl] in user-directive tag [on line 25, column 6 in tag.ftl]----------Java backtrace for programmers:----------freemarker.core.InvalidReferenceException: Expression a is undefined on line 27, column 23 in tag.ftl.at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:125)at freemarker.core.Expression.getStringValue(Expression.java:118)at freemarker.core.Expression.getStringValue(Expression.java:93)at freemarker.core.DollarVariable.accept(DollarVariable.java:76)at freemarker.core.Environment.visit(Environment.java:221)at freemarker.core.MixedContent.accept(MixedContent.java:92)at freemarker.core.Environment.visit(Environment.java:221)at freemarker.core.Environment.visit(Environment.java:406)at freemarker.core.BodyInstruction.accept(BodyInstruction.java:93)at freemarker.core.Environment.visit(Environment.java:221)at freemarker.core.MixedContent.accept(MixedContent.java:92)at freemarker.core.Environment.visit(Environment.java:221)at freemarker.core.Macro$Context.runMacro(Macro.java:172)at freemarker.core.Environment.visit(Environment.java:614)at freemarker.core.UnifiedCall.accept(UnifiedCall.java:106)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 com.you.freemarker.FreemarkerTemplate.printFtl(FreemarkerTemplate.java:77)at com.you.test.freemarker.FreemarkerTest.studentPrint(FreemarkerTest.java:224)at com.you.test.freemarker.FreemarkerTest.testTag(FreemarkerTest.java:211)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)<html>  <head>    <meta http-equiv="content-type" content="text/html; charset=UTF-8">    <title>freemarker自定义标签</title>  </head>    <body>                     <h1>张三，你好1</h1>           <h1>张三，你好2</h1>           <h1>张三，你好3</h1>           <h1>张三，你好4</h1>           <h1>张三，你好5</h1>           <h1>张三，你好6</h1>           <h1>张三，你好7</h1>           <h1>张三，你好8</h1>           <h1>张三，你好9</h1>           <h1>张三，你好10</h1>           <h1>张三，你好11</h1>           <h1>张三，你好12</h1>           <h1>张三，你好13</h1>           <h1>张三，你好14</h1>           <h1>张三，你好15</h1>           <h1>张三，你好16</h1>           <h1>张三，你好17</h1>           <h1>张三，你好18</h1>           <h1>张三，你好19</h1>           <h1>张三，你好20</h1>           <h1>张三，你好21</h1>           <h1>张三，你好22</h1>           <h1>张三，你好23</h1>           <h1>张三，你好24</h1>           <h1>张三，你好25</h1>           <h1>张三，你好26</h1>           <h1>张三，你好27</h1>           <h1>张三，你好28</h1>           <h1>张三，你好29</h1>           <h1>张三，你好30</h1>           <h1>张三，你好31</h1>           <h1>张三，你好32</h1>           <h1>张三，你好33</h1>           <h1>张三，你好34</h1>           <h1>张三，你好35</h1>           <h1>张三，你好36</h1>           <h1>张三，你好37</h1>           <h1>张三，你好38</h1>           <h1>张三，你好39</h1>           <h1>张三，你好40</h1>                   <ul>           <li>1----45----78</li>         </ul>         <ul>           <li>1----Expression a is undefined on line 27, column 23 in tag.ftl.The problematic instruction:----------==> ${a} [on line 27, column 21 in tag.ftl] in user-directive tag [on line 25, column 6 in tag.ftl]----------Java backtrace for programmers:----------freemarker.core.InvalidReferenceException: Expression a is undefined on line 27, column 23 in tag.ftl.at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:125)at freemarker.core.Expression.getStringValue(Expression.java:118)at freemarker.core.Expression.getStringValue(Expression.java:93)at freemarker.core.DollarVariable.accept(DollarVariable.java:76)at freemarker.core.Environment.visit(Environment.java:221)at freemarker.core.MixedContent.accept(MixedContent.java:92)at freemarker.core.Environment.visit(Environment.java:221)at freemarker.core.Environment.visit(Environment.java:406)at freemarker.core.BodyInstruction.accept(BodyInstruction.java:93)at freemarker.core.Environment.visit(Environment.java:221)at freemarker.core.MixedContent.accept(MixedContent.java:92)at freemarker.core.Environment.visit(Environment.java:221)at freemarker.core.Macro$Context.runMacro(Macro.java:172)at freemarker.core.Environment.visit(Environment.java:614)at freemarker.core.UnifiedCall.accept(UnifiedCall.java:106)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 com.you.freemarker.FreemarkerTemplate.printFtl(FreemarkerTemplate.java:77)at com.you.test.freemarker.FreemarkerTest.studentPrint(FreemarkerTest.java:224)at com.you.test.freemarker.FreemarkerTest.testTag(FreemarkerTest.java:211)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

<#macro tag>          <#nested 45 78/>          <#nested/>          <#nested/>          <#nested/>     </#macro>          <@tag;a,b>         <ul>           <li>1----${a}----${b}</li>         </ul>     </@tag>

   nested没有全部赋值

3、解决办法

<#macro tag>          <#nested 45 78/>          <#nested 56 12/>          <#nested 23 69/>          <#nested 44 98/>     </#macro>          <@tag;a,b>         <ul>           <li>1----${a}----${b}</li>         </ul>     </@tag>

结果：

<ul>           <li>1----45----78</li>         </ul>         <ul>           <li>1----56----12</li>         </ul>         <ul>           <li>1----23----69</li>         </ul>         <ul>           <li>1----44----98</li>         </ul>

通过这种参数可以获取自定义指令中的变量