gwt-2.7.0升级-gwt生成错误'；com.google.gwt.user.cellview.client.CellBasedWidgetImpl'；不能是抽象的

。 . . . .

java.util.Set
[java]验证可实例化性
[java]java.util.LinkedHashSet
[java][WARN]正在检查符合序列化条件的对象的所有子类型
“com/google/gwt/user/cellview/client/cellbasedwidgetempl.java”中的[java][ERROR]错误
[java][ERROR]第46行：重新绑定结果'com.google.gwt.user.cellview.client.cellbasedwidgetempl'不能是抽象的

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使用ant（gwt-2.7.0）构建gwt项目war时出错。项目在超级开发模式下运行正常。War使用gwt-2.5.0构建时没有任何错误

从gwt.xml中删除opera置换

   java.util.Set
 [java]                                                                                                                                                                                                    Verifying instantiability
 [java]                                                                                                                                                                                                       java.util.LinkedHashSet<?>
 [java]                                                                                                                                                                                                          [WARN] Checking all subtypes of Object which qualify for serialization
 [java]    [ERROR] Errors in 'com/google/gwt/user/cellview/client/CellBasedWidgetImpl.java'
 [java]       [ERROR] Line 46: Rebind result 'com.google.gwt.user.cellview.client.CellBasedWidgetImpl' cannot be abstract

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gwt-2.7.0不支持opera排列

依赖项jar可能存在问题。。请共享完整的错误日志

   java.util.Set
 [java]                                                                                                                                                                                                    Verifying instantiability
 [java]                                                                                                                                                                                                       java.util.LinkedHashSet<?>
 [java]                                                                                                                                                                                                          [WARN] Checking all subtypes of Object which qualify for serialization
 [java]    [ERROR] Errors in 'com/google/gwt/user/cellview/client/CellBasedWidgetImpl.java'
 [java]       [ERROR] Line 46: Rebind result 'com.google.gwt.user.cellview.client.CellBasedWidgetImpl' cannot be abstract

    <extend-property name="user.agent" values="opera" />