异常-----Can't convert the date to string, because it is not known which parts of the date variable ar...

1、错误描述

 

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  1 五月 27, 2014 12:07:05 上午 freemarker.log.JDK14LoggerFactory$JDK14Logger error
  2 严重: Template processing error: "Can't convert the date to string, because it is not known which parts of the date variable are in use. Use ?date, ?time or ?datetime built-in, or ?string.\u003Cformat> or ?string(format) built-in with this date."
  3 
  4 Can't convert the date to string, because it is not known which parts of the date variable are in use. Use ?date, ?time or ?datetime built-in, or ?string. or ?string(format) built-in with this date.
  5 The problematic instruction:
  6 ----------
  7 ==> ${student.studentBirthday} [on line 17, column 12 in student.ftl]
  8 ----------
  9 
 10 Java backtrace for programmers:
 11 ----------
 12 freemarker.template.TemplateModelException: Can't convert the date to string, because it is not known which parts of the date variable are in use. Use ?date, ?time or ?datetime built-in, or ?string. or ?string(format) built-in with this date.
 13     at freemarker.core.Environment.formatDate(Environment.java:776)
 14     at freemarker.core.Expression.getStringValue(Expression.java:105)
 15     at freemarker.core.Expression.getStringValue(Expression.java:93)
 16     at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
 17     at freemarker.core.Environment.visit(Environment.java:221)
 18     at freemarker.core.MixedContent.accept(MixedContent.java:92)
 19     at freemarker.core.Environment.visit(Environment.java:221)
 20     at freemarker.core.Environment.process(Environment.java:199)
 21     at freemarker.template.Template.process(Template.java:259)
 22     at com.you.freemarker.FreemarkerTemplate.printFtl(FreemarkerTemplate.java:77)
 23     at com.you.test.freemarker.FreemarkerTest.student(FreemarkerTest.java:125)
 24     at com.you.test.freemarker.FreemarkerTest.testStudent(FreemarkerTest.java:111)
 25     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 26     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 27     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 28     at java.lang.reflect.Method.invoke(Unknown Source)
 29     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
 30     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
 31     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
 32     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
 33     at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
 34     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
 35     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
 36     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
 37     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
 38     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
 39     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
 40     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
 41     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
 42     at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
 43     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
 44     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
 45     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
 46     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
 47     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
 48     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
 49 
 50 
 51 Can't convert the date to string, because it is not known which parts of the date variable are in use. Use ?date, ?time or ?datetime built-in, or ?string. or ?string(format) built-in with this date.
 52 The problematic instruction:
 53 ----------
 54 ==> ${student.studentBirthday} [on line 17, column 12 in student.ftl]
 55 ----------
 56 
 57 Java backtrace for programmers:
 58 ----------
 59 freemarker.template.TemplateModelException: Can't convert the date to string, because it is not known which parts of the date variable are in use. Use ?date, ?time or ?datetime built-in, or ?string. or ?string(format) built-in with this date.
 60     at freemarker.core.Environment.formatDate(Environment.java:776)
 61     at freemarker.core.Expression.getStringValue(Expression.java:105)
 62     at freemarker.core.Expression.getStringValue(Expression.java:93)
 63     at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
 64     at freemarker.core.Environment.visit(Environment.java:221)
 65     at freemarker.core.MixedContent.accept(MixedContent.java:92)
 66     at freemarker.core.Environment.visit(Environment.java:221)
 67     at freemarker.core.Environment.process(Environment.java:199)
 68     at freemarker.template.Template.process(Template.java:259)
 69     at com.you.freemarker.FreemarkerTemplate.printFtl(FreemarkerTemplate.java:77)
 70 
 71 
 72   
 73     
 74     
 75     
 76     
 77     
 78     
 79 
 80   
 81   
 82   
 83         姓名：张三丰
 84          性别：男
 85          年龄：34
 86          生日：
 87 Can't convert the date to string, because it is not known which parts of the date variable are in use. Use ?date, ?time or ?datetime built-in, or ?string. or ?string(format) built-in with this date.
 88 The problematic instruction:
 89 ----------
 90 ==> ${student.studentBirthday} [on line 17, column 12 in student.ftl]
 91 ----------
 92 
 93 Java backtrace for programmers:
 94 ----------
 95 freemarker.template.TemplateModelException: Can't convert the date to string, because it is not known which parts of the date variable are in use. Use ?date, ?time or ?datetime built-in, or ?string. or ?string(format) built-in with this date.
 96     at freemarker.core.Environment.formatDate(Environment.java:776)
 97     at freemarker.core.Expression.getStringValue(Expression.java:105)
 98     at freemarker.core.Expression.getStringValue(Expression.java:93)
 99     at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
100     at freemarker.core.Environment.visit(Environment.java:221)
101     at freemarker.core.MixedContent.accept(MixedContent.java:92)
102     at freemarker.core.Environment.visit(Environment.java:221)
103     at freemarker.core.Environment.process(Environment.java:199)
104     at freemarker.template.Template.process(Template.java:259)
105     at com.you.freemarker.FreemarkerTemplate.printFtl(FreemarkerTemplate.java:77)
106     at com.you.test.freemarker.FreemarkerTest.student(FreemarkerTest.java:125)
107     at com.you.test.freemarker.FreemarkerTest.testStudent(FreemarkerTest.java:111)
108     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
109     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
110     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
111     at java.lang.reflect.Method.invoke(Unknown Source)
112     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
113     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
114     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
115     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
116     at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
117     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
118     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
119     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
120     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
121     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
122     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
123     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
124     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
125     at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
126     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
127     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
128     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
129     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
130     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
131     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
132     at com.you.test.freemarker.FreemarkerTest.student(FreemarkerTest.java:125)
133     at com.you.test.freemarker.FreemarkerTest.testStudent(FreemarkerTest.java:111)
134     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
135     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
136     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
137     at java.lang.reflect.Method.invoke(Unknown Source)
138     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
139     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
140     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
141     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
142     at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
143     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
144     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
145     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
146     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
147     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
148     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
149     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
150     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
151     at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
152     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
153     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
154     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
155     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
156     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
157     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
158 五月 27, 2014 12:07:05 上午 freemarker.log.JDK14LoggerFactory$JDK14Logger error
159 严重: Template processing error: "Can't convert the date to string, because it is not known which parts of the date variable are in use. Use ?date, ?time or ?datetime built-in, or ?string.\u003Cformat> or ?string(format) built-in with this date."
160 
161 Can't convert the date to string, because it is not known which parts of the date variable are in use. Use ?date, ?time or ?datetime built-in, or ?string. or ?string(format) built-in with this date.
162 The problematic instruction:
163 ----------
164 ==> ${student.studentBirthday} [on line 17, column 12 in student.ftl]
165 ----------
166 
167 Java backtrace for programmers:
168 ----------
169 freemarker.template.TemplateModelException: Can't convert the date to string, because it is not known which parts of the date variable are in use. Use ?date, ?time or ?datetime built-in, or ?string. or ?string(format) built-in with this date.
170     at freemarker.core.Environment.formatDate(Environment.java:776)
171     at freemarker.core.Expression.getStringValue(Expression.java:105)
172     at freemarker.core.Expression.getStringValue(Expression.java:93)
173     at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
174     at freemarker.core.Environment.visit(Environment.java:221)
175     at freemarker.core.MixedContent.accept(MixedContent.java:92)
176     at freemarker.core.Environment.visit(Environment.java:221)
177     at freemarker.core.Environment.process(Environment.java:199)
178     at freemarker.template.Template.process(Template.java:259)
179     at com.you.freemarker.FreemarkerTemplate.printFile(FreemarkerTemplate.java:109)
180     at com.you.test.freemarker.FreemarkerTest.studentFile(FreemarkerTest.java:139)
181     at com.you.test.freemarker.FreemarkerTest.testStudent(FreemarkerTest.java:112)
182     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
183     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
184     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
185     at java.lang.reflect.Method.invoke(Unknown Source)
186     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
187     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
188     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
189     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
190     at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
191     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
192     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
193     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
194     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
195     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
196     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
197     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
198     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
199     at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
200     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
201     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
202     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
203     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
204     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
205     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
206 
207 
208 Can't convert the date to string, because it is not known which parts of the date variable are in use. Use ?date, ?time or ?datetime built-in, or ?string. or ?string(format) built-in with this date.
209 The problematic instruction:
210 ----------
211 ==> ${student.studentBirthday} [on line 17, column 12 in student.ftl]
212 ----------
213 
214 Java backtrace for programmers:
215 ----------
216 freemarker.template.TemplateModelException: Can't convert the date to string, because it is not known which parts of the date variable are in use. Use ?date, ?time or ?datetime built-in, or ?string. or ?string(format) built-in with this date.
217     at freemarker.core.Environment.formatDate(Environment.java:776)
218     at freemarker.core.Expression.getStringValue(Expression.java:105)
219     at freemarker.core.Expression.getStringValue(Expression.java:93)
220     at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
221     at freemarker.core.Environment.visit(Environment.java:221)
222     at freemarker.core.MixedContent.accept(MixedContent.java:92)
223     at freemarker.core.Environment.visit(Environment.java:221)
224     at freemarker.core.Environment.process(Environment.java:199)
225     at freemarker.template.Template.process(Template.java:259)
226     at com.you.freemarker.FreemarkerTemplate.printFile(FreemarkerTemplate.java:109)
227     at com.you.test.freemarker.FreemarkerTest.studentFile(FreemarkerTest.java:139)
228     at com.you.test.freemarker.FreemarkerTest.testStudent(FreemarkerTest.java:112)
229     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
230     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
231     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
232     at java.lang.reflect.Method.invoke(Unknown Source)
233     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
234     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
235     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
236     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
237     at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
238     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
239     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
240     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
241     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
242     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
243     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
244     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
245     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
246     at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
247     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
248     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
249     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
250     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
251     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
252     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) 

 

 

 

 2、错误原因

 

     不能将Date类型直接转化为String类型

 

3、解决办法

     将日期类型后面添加如下：

     原来：生日：${student.studentBirthday}

     修改后：生日：${(student.studentBirthday)?string("yyyy-MM-dd")}