不支持1.7.2版本启动？

[ghost]

我在使用JMCCC的时候遇到了一些问题，希望能得到一些答复

事情是这样的：

本人最近（实际上是今天）写了个针对某服务器的启动器，本人也按照README里的示例去写了启动代码，但是在测试的时候出现了问题：

java.io.IOException: unable to resolve json
    at com.github.to2mbn.jmccc.version.Versions.resolveVersion(Versions.java:39)
    at biz.cirno.jdj.cirnocraft.launcher.form.MainWindow$5.actionPerformed(MainWindow.java:308)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
    at java.awt.Component.processMouseEvent(Component.java:6516)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
    at java.awt.Component.processEvent(Component.java:6281)
    at java.awt.Container.processEvent(Container.java:2229)
    at java.awt.Component.dispatchEventImpl(Component.java:4872)
    at java.awt.Container.dispatchEventImpl(Container.java:2287)
    at java.awt.Component.dispatchEvent(Component.java:4698)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
    at java.awt.Container.dispatchEventImpl(Container.java:2273)
    at java.awt.Window.dispatchEventImpl(Window.java:2719)
    at java.awt.Component.dispatchEvent(Component.java:4698)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:740)
    at java.awt.EventQueue.access$300(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:699)
    at java.awt.EventQueue$3.run(EventQueue.java:697)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
    at java.awt.EventQueue$4.run(EventQueue.java:713)
    at java.awt.EventQueue$4.run(EventQueue.java:711)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:710)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
Caused by: org.json.JSONException: JSONObject["assets"] not found.
    at org.json.JSONObject.get(JSONObject.java:473)
    at org.json.JSONObject.getString(JSONObject.java:654)
    at com.github.to2mbn.jmccc.version.VersionParser.parse(VersionParser.java:26)
    at com.github.to2mbn.jmccc.version.Versions.resolveVersion(Versions.java:37)
    ... 37 more

根据错误消息可以判断出错误是因为版本json文件里缺少“assets”这个值发生的

但是问题来了：本人所在的服务器的客户端版本为1.7.2，版本文件里并不存在assets这个值，本人也翻阅了部分相关源代码也没能发现有关于这方面的解决方案。

请问这样的问题能否修复，或者给出个解决方案？

（JMCCC版本为最新的2.3.1）

[darkyzhou]

@yushijinhun 这是他的锅
出现这个错误是因为1.7.10以前的版本用的assets的index都是legacy.json 所以version的json不会包含assets 正在修复

[darkyzhou]

已解决

[ghost]

刚才看了下修复后的源代码，虽然确实解决了1.7.2不能启动的问题，但是...1.7.10和以上版本的兼容性怎么办？

PS：我个人认为的解决方法是加个判断，检查是否有assets值，若不存在的时候就加载legacy.json，若存在时加载对应的assets文件

[darkyzhou]

optString已经把这事干了

[yushijinhun]

我的锅咯