生成Google App Engine后端（JDK 1.8，安装了新的ADT），只有在Java 1.5及以上版本中才能使用注释。

Question

我安装了最新的ADT: http://developer.android.com/sdk/index.html?hl=sk

然后我安装了以下组件:

当我进入Eclipse自述文件目录时，发现有：

Eclipse项目发布说明

版本4.3.0，上次修订于2013年5月29日

我创建了一个新的Android应用程序，然后右键单击->Google->生成Google App Engine后端，结果如下：

Description Resource    Path    Location    Type
The import android.os.Build is never used   MainActivity.java   /A/src/com/uniquebullshit/a line 12 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  MessageData.java    /A-AppEngine/src/com/uniquebullshit/a   line 22 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 21 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  MessageData.java    /A-AppEngine/src/com/uniquebullshit/a   line 28 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 21 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  MessageData.java    /A-AppEngine/src/com/uniquebullshit/a   line 29 Java Problem
The import android.support.v7.app.ActionBar is never used   MainActivity.java   /A/src/com/uniquebullshit/a line 4  Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  DeviceInfo.java /A-AppEngine/src/com/uniquebullshit/a   line 25 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  DeviceInfo.java /A-AppEngine/src/com/uniquebullshit/a   line 33 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 46 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 46 Java Problem
Syntax error, parameterized types are only available if source level is 1.5 or greater  MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 98 Java Problem
The method setMaxResults(int) in the type Query is not applicable for the arguments (Integer)   MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 95 Java Problem
Syntax error, parameterized types are only available if source level is 1.5 or greater  MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 112    Java Problem
Syntax error, 'for each' statements are only available if source level is 1.5 or greater    MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 105    Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 127    Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 126    Java Problem
The method listDeviceInfo(String, Integer) in the type DeviceInfoEndpoint is not applicable for the arguments (null, int)   MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 142    Java Problem
Syntax error, parameterized types are only available if source level is 1.5 or greater  MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 142    Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 74 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 73 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 76 Java Problem
Syntax error, parameterized types are only available if source level is 1.5 or greater  MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 75 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 77 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 76 Java Problem
Syntax error, parameterized types are only available if source level is 1.5 or greater  MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 81 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 77 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 140    Java Problem
Type mismatch: cannot convert from Object to DeviceInfo DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 143    Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 119    Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 139    Java Problem
Type mismatch: cannot convert from Object to DeviceInfo DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 154    Java Problem
There was a problem generating the API metadata for your Cloud Endpoints classes: com.google.api.server.spi.config.ApiConfigException: class com.uniquebullshit.a.MessageEndpoint has no @Api annotation.   A-AppEngine     Unknown Google App Engine Cloud Endpoints Problem Marker
Type mismatch: cannot convert from element type Object to DeviceInfo    MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 144    Java Problem
Syntax error, 'for each' statements are only available if source level is 1.5 or greater    MessageEndpoint.java    /A-AppEngine/src/com/uniquebullshit/a   line 144    Java Problem
Syntax error, parameterized types are only available if source level is 1.5 or greater  DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 33 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 34 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 31 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 32 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 35 Java Problem
Syntax error, parameterized types are only available if source level is 1.5 or greater  DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 39 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 34 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 35 Java Problem
Syntax error, 'for each' statements are only available if source level is 1.5 or greater    DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 60 Java Problem
Syntax error, parameterized types are only available if source level is 1.5 or greater  DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 65 Java Problem
The method setMaxResults(int) in the type Query is not applicable for the arguments (Integer)   DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 51 Java Problem
Syntax error, parameterized types are only available if source level is 1.5 or greater  DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 54 Java Problem
Type mismatch: cannot convert from Object to DeviceInfo DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 82 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 97 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 77 Java Problem
Syntax error, annotations are only available if source level is 1.5 or greater  DeviceInfoEndpoint.java /A-AppEngine/src/com/uniquebullshit/a   line 78 Java Problem

如何处理这个问题？

编辑：

- Yoda

Answer 1

我试过以下方法，它有所帮助。

1. 勾选下图中标记为蓝色高亮区域的复选框 Use default compliance settings。
2. 如果这样还不行，请尝试更改 Compiler compliance level 到不同的级别，然后按应用再返回。

- kiranpradeep

Answer 2

对我来说，启用项目特定设置复选框未被选中。我选择了它，并通过项目菜单清除了该项目。

- Shrivatsa

Answer 3

Stultuske在[eclipse magic: ... Syntax error, varargs are only available if source level is 1.5 or greater]提到的解决方法。

在Mac OS X下：

• 安装Java 6 JDK
• 进入Eclipse > Preferences
• 从Java > Installed JREs中选择添加...
• 选择Standard VM并将'/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home'目录作为JRE主目录，然后完成、确定

- yann-h

Answer 4

我遇到了类似的问题。

我在“Java Build Path”下检查了Java JDK版本。

我在“Java Compiler”下检查了兼容性级别。

我查看了项目属性，并发现Java没有被勾选。勾选后，问题得到了解决（一旦项目重新构建）。

- dutoitns

Answer 5

请确保源代码级别为1.5或更高版本。看起来您正在使用较旧的JDK版本。

- Stultuske

---

我有最新的JDK 1.8。 - Yoda

应该可以在这个线程中工作： https://dev59.com/rXI-5IYBdhLWcg3wqqXh 看起来有时候，你需要使用JDK 6来构建（至少很奇怪）以避免高版本的问题。 我自己还没有遇到过这个问题，所以这里不是基于个人经验在说话。 - Stultuske

什么也没做，改了; / - Yoda

将项目设置中的“编译器兼容性级别”设置为1.5或更高版本。链接：https://dev59.com/rXI-5IYBdhLWcg3wqqXh#1736779 - ToolmakerSteve