Solo 是一款一个命令就能搭建好的 Java 开源博客系统，如果你想开个独立博客，请一定不要错过！
2.7.0 版本新增了一个文章配图功能，美图来自 Bing 壁纸。
java -cp WEB-INF/lib/*;WEB-INF/classes org.b3log.solo.Starter从 2.6.0 升级只需将已有的配置拷贝覆盖即可，启动后会自动升级。
历史版本变更请浏览这里。
[ERROR]-[2018-03-28 00:55:25]-[org.b3log.latke.servlet.renderer.freemarker.AbstractFreeMarkerRenderer:138]: FreeMarker renders error
FreeMarker template error:
The following has evaluated to null or missing:
==> useTumbnailLabel [in template "admin-article.ftl" at line 9, column 49]
----
Tip: If the failing expression is known to be legally refer to something that's sometimes 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: ${useTumbnailLabel} [in template "admin-article.ftl" at line 9, column 47]
----
Java stack trace (for programmers):
----
freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...]
at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:131)
at freemarker.core.EvalUtil.coerceModelToString(EvalUtil.java:355)
at freemarker.core.Expression.evalAndCoerceToString(Expression.java:82)
at freemarker.core.DollarVariable.accept(DollarVariable.java:41)
at freemarker.core.Environment.visit(Environment.java:324)
at freemarker.core.MixedContent.accept(MixedContent.java:54)
at freemarker.core.Environment.visit(Environment.java:324)
at freemarker.core.Environment.process(Environment.java:302)
at freemarker.template.Template.process(Template.java:325)
...
2.6 升级 2.7 报错。。说实际版本是 2.5
Attempt to skip more than one version to upgrade. Expected: 2.6.0, Actually: 2.5.0
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