Solo 开发指南

搭建 solo 开发环境要事先安装 jdk,maven,tomcat 和 mysql(solo 默认使用)。下面是在 centos7 上安装 mysql8 的命令步骤：

1. wget https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm
2. yum -y mysql80-community-release-el7-3.noarch.rpm
3. yum -y install mysql-community-server (从 oracle 官网下载 mysql 速度较慢)
4. systemctl start mysqld.service （启动 mysql）

按照上述步骤，git clone 后用 mvn jetty:run 运行报错，错误信息应该是说连接 mysql 失败，难道要先装 mysql 吗？不是说集成了 mysql 在项目发布的文件里吗？第一次尝试 solo，谁能帮忙解答一下？谢谢。打印信息如下：

[INFO ]-[2019-06-23 10:38:10]-[com.zaxxer.hikari.HikariDataSource:110]: HikariPool-1 - Starting...

[ERROR]-[2019-06-23 10:38:11]-[com.zaxxer.hikari.pool.HikariPool:574]: HikariPool-1 - Exception during pool initialization.
com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
        at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174)
        ...
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:347)
Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        ... 72 more
Caused by: java.net.ConnectException: Connection refused (Connection refused)
        at java.base/java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399)
        at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:242)
        at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:224)
        at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:403)
        at java.base/java.net.Socket.connect(Socket.java:591)
        at com.mysql.cj.protocol.StandardSocketFactory.connect(StandardSocketFactory.java:155)
        at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:65)
        ... 75 more
[ERROR]-[2019-06-23 10:38:11]-[org.b3log.solo.service.InitService:186]: Check tables failed, please make sure database existed and database configuration [jdbc.*] in local.props is correct [msg=Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.]

请教一下，使用 injigen 主题的时候，点击首页的动态会报一个错误。我没有找到解决办法。、
[ERROR]-[2018-09-03 10:49:11]-[org.b3log.latke.servlet.renderer.freemarker.AbstractFreeMarkerRenderer:138]: FreeMarker renders error
FreeMarker template error:
An error has occurred when reading existing sub-variable "isReply"; see cause exception! The type of the containing value was: extended_hash+string (org.json.JSONObject wrapped into f.e.b.StringModel)

FTL stack trace ("~" means nesting-related):
- Failed at: #if comment.isReply != "" && comment... [in template "common-comment.ftl" at line 28, column 13]
- Reached through: #include "common-comment.ftl" [in template "dynamic.ftl" at line 44, column 17]

org.b3log.latke.service.ServiceException: Initailize Solo error: A json object to persist to repository[name=vseu__option] does not contain a key[optionValue]
mysql 数据库初始化报了这个错误，这是什么问题？