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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