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
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