Question

我在使用Twig（见下文）尝试加载时在本地开发模式中看到异常，我们在Live GAE中看不到。

我的同事也没有看到它，但我们有相同的开发设置（虽然他在Mac上运行）

它失败的项目是ArrayList<ContactStatus> ContactStatus是一个简单的枚举（见下文），这是模型声明

List<ContactStatus> contactStatuses = new ArrayList<ContactStatus>();

据我所知，这应该只是开箱即用？

不需要@Child注释等吗？（确实添加@Embedded似乎因为问题35：http://code.google.com/p/twig-persist/issues/detail?id=35）

当我运行调试会话时，这似乎失败了因为ArrayList 没有实现Comparable（因为Enum总是这样做）

我们做错了什么？！

版本

Java 7
Twig 2.0-beta3
AppEngine 1.6.2.1
GWT 2.4.0

枚举

public enum ContactStatus implements IsSerializable, Serializable {
   Public, Secret, Blocked, Ignored;
}

我们在开发模式中看到的异常

java.lang.IllegalArgumentException: Cannot compare [SimpleProperty value=[Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Blocked, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Blocked, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Blocked, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Blocked, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Blocked, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Blocked, Ignored, Ignored, Ignored, Ignored, Ignored, Blocked, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Blocked, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored] path=contactStatuses indexed=false] with [SimpleProperty value=[Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Blocked, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Blocked, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Blocked, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Blocked, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Blocked, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Blocked, Ignored, Ignored, Ignored, Ignored, Ignored, Blocked, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Blocked, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored, Ignored] path=contactStatuses indexed=false]
at com.google.code.twig.util.PropertyComparator.compare(PropertyComparator.java:23)
at com.google.code.twig.util.PropertyComparator.compare(PropertyComparator.java:7)
at java.util.TreeMap.compare(TreeMap.java:1188)
at java.util.TreeMap.put(TreeMap.java:531)
at java.util.TreeSet.add(TreeSet.java:255)
at java.util.AbstractCollection.addAll(AbstractCollection.java:334)
at java.util.TreeSet.addAll(TreeSet.java:312)
at com.google.code.twig.standard.StandardDecodeCommand.entityToInstance(StandardDecodeCommand.java:60)
at com.google.code.twig.standard.StandardDecodeCommand.keyToInstance(StandardDecodeCommand.java:127)
at com.google.code.twig.standard.StandardSingleTypedLoadCommand.keyToInstance(StandardSingleTypedLoadCommand.java:9)
at com.google.code.twig.standard.StandardSingleTypedLoadCommand.now(StandardSingleTypedLoadCommand.java:34)
at com.google.code.twig.standard.TranslatorObjectDatastore.load(TranslatorObjectDatastore.java:202)
at com.recruitmentlink.server.persistence.twig.TwigProfileImpl.getExistingCandidate(TwigProfileImpl.java:92)

Answer 1

这是John Patterson关于该问题的一个（超级快速）回复以及相关代码“修复”，它可以抑制这种不必要的“异常”

http://groups.google.com/group/twig-persist/browse_frm/thread/81b7d913a2ad37cc#

该问题仅影响使用Java 7的人。

由于GAE部署正在运行Java 6，因此我们没有看到实时问题。

在DevMode中看到的Twig Load错误，但在GAE中没有

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