初次运行的错误

环境：
Java version: 1.6.0_45, vendor: Sun Microsystems Inc.
Java home: /var/opt/java/jdk1.6/jre
Default locale: zh_CN, platform encoding: UTF-8
OS name: "linux", version: "3.13.0-37-generic", arch: "amd64", family: "unix"
系统：linuxmint 17.1

```
[ERROR] 2015-05-17 11:11:49 method:freemarker.log._Log4JLoggerFactory$Log4JLogger.error(_Log4JLoggerFactory.java:60)
Error executing FreeMarker template
FreeMarker template error:
The following has evaluated to null or missing:
==> blog  [in template "blog/_form.html" at line 13, column 41]

----
Tip: If the failing expression is known to be legally refer to something that's null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----

----
FTL stack trace ("~" means nesting-related):
    - Failed at: ${blog.publishTime}  [in template "blog/_form.html" at line 13, column 39]
    - Reached through: #include "_form.html"  [in template "blog/add.html" at line 3, column 17]
----

Java stack trace (for programmers):
----
freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...]
    at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:108)
    at freemarker.core.UnexpectedTypeException.newDesciptionBuilder(UnexpectedTypeException.java:60)
    at freemarker.core.UnexpectedTypeException.<init>(UnexpectedTypeException.java:40)
    at freemarker.core.NonHashException.<init>(NonHashException.java:46)
    at freemarker.core.Dot._eval(Dot.java:45)
    at freemarker.core.Expression.eval(Expression.java:76)
    at freemarker.core.Expression.evalAndCoerceToString(Expression.java:80)
    at freemarker.core.DollarVariable.accept(DollarVariable.java:40)
    at freemarker.core.Environment.visit(Environment.java:257)
    at freemarker.core.MixedContent.accept(MixedContent.java:57)
    at freemarker.core.Environment.visit(Environment.java:257)
    at freemarker.core.Environment.include(Environment.java:1967)
    at freemarker.core.Include.accept(Include.java:175)
    at freemarker.core.Environment.visit(Environment.java:257)
    at freemarker.core.MixedContent.accept(MixedContent.java:57)
    at freemarker.core.Environment.visit(Environment.java:257)
    at freemarker.core.Environment.process(Environment.java:235)
    at freemarker.template.Template.process(Template.java:262)
    at com.jfinal.render.FreeMarkerRender.render(FreeMarkerRender.java:128)
    at com.jfinal.core.ActionHandler.handle(ActionHandler.java:92)
    at com.jfinal.ext.handler.ContextPathHandler.handle(ContextPathHandler.java:47)
    at com.jfinal.core.JFinalFilter.doFilter(JFinalFilter.java:72)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1476)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:533)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
    at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
    at org.eclipse.jetty.server.Server.handle(Server.java:370)
    at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
    at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971)
    at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)
    at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
    at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
    at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
    at java.lang.Thread.run(Thread.java:662)
[ERROR] 2015-05-17 11:11:49 method:com.jfinal.core.ActionHandler.handle(ActionHandler.java:97)
/blog/add?_=1431832308937
com.jfinal.render.RenderException: freemarker.core.InvalidReferenceException: The following has evaluated to null or missing:
==> blog  [in template "blog/_form.html" at line 13, column 41]

----
Tip: If the failing expression is known to be legally refer to something that's null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----

----
FTL stack trace ("~" means nesting-related):
    - Failed at: ${blog.publishTime}  [in template "blog/_form.html" at line 13, column 39]
    - Reached through: #include "_form.html"  [in template "blog/add.html" at line 3, column 17]
----
    at com.jfinal.render.FreeMarkerRender.render(FreeMarkerRender.java:130)
    at com.jfinal.core.ActionHandler.handle(ActionHandler.java:92)
    at com.jfinal.ext.handler.ContextPathHandler.handle(ContextPathHandler.java:47)
    at com.jfinal.core.JFinalFilter.doFilter(JFinalFilter.java:72)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1476)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:533)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
    at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
    at org.eclipse.jetty.server.Server.handle(Server.java:370)
    at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
    at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971)
    at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)
    at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
    at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
    at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
    at java.lang.Thread.run(Thread.java:662)
Caused by: freemarker.core.InvalidReferenceException: The following has evaluated to null or missing:
==> blog  [in template "blog/_form.html" at line 13, column 41]

----
Tip: If the failing expression is known to be legally refer to something that's null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----

----
FTL stack trace ("~" means nesting-related):
    - Failed at: ${blog.publishTime}  [in template "blog/_form.html" at line 13, column 39]
    - Reached through: #include "_form.html"  [in template "blog/add.html" at line 3, column 17]
----
    at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:108)
    at freemarker.core.UnexpectedTypeException.newDesciptionBuilder(UnexpectedTypeException.java:60)
    at freemarker.core.UnexpectedTypeException.<init>(UnexpectedTypeException.java:40)
    at freemarker.core.NonHashException.<init>(NonHashException.java:46)
    at freemarker.core.Dot._eval(Dot.java:45)
    at freemarker.core.Expression.eval(Expression.java:76)
    at freemarker.core.Expression.evalAndCoerceToString(Expression.java:80)
    at freemarker.core.DollarVariable.accept(DollarVariable.java:40)
    at freemarker.core.Environment.visit(Environment.java:257)
    at freemarker.core.MixedContent.accept(MixedContent.java:57)
    at freemarker.core.Environment.visit(Environment.java:257)
    at freemarker.core.Environment.include(Environment.java:1967)
    at freemarker.core.Include.accept(Include.java:175)
    at freemarker.core.Environment.visit(Environment.java:257)
    at freemarker.core.MixedContent.accept(MixedContent.java:57)
    at freemarker.core.Environment.visit(Environment.java:257)
    at freemarker.core.Environment.process(Environment.java:235)
    at freemarker.template.Template.process(Template.java:262)
    at com.jfinal.render.FreeMarkerRender.render(FreeMarkerRender.java:128)
    ... 28 more
```


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