无法解析类型 java.lang.object - Eclipse 构建路径不起作用
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/25337182/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
The type java.lang.object cannot be resolved - Eclipse buildpath not working
提问by user2260199
I'm having a problem with Eclipse on by Mac OSX Mountain Lion. I have recently installed Android SDK and in my java projects I get the following message:
我在 Mac OSX Mountain Lion 上运行 Eclipse 时遇到问题。我最近安装了 Android SDK，在我的 Java 项目中，我收到以下消息：
The type java.lang.Object cannot be resolved. It is indirectly referenced from required .class files
无法解析 java.lang.Object 类型。它是从所需的 .class 文件间接引用的
Reading about this issue, it would seem that I do not have a valid JRE defined in the build path of my project. Checking the project's build path with Properties > Java Build Path > Libraries I see that The JRE System Library has a red cross next to it. However when I click Add Library... > JRE System Library I get the message:
阅读有关此问题的信息，似乎我的项目的构建路径中没有定义有效的 JRE。使用 Properties > Java Build Path > Libraries 检查项目的构建路径，我看到 JRE 系统库旁边有一个红叉。但是，当我单击添加库... > JRE 系统库时，我收到消息：
An error has occured. See error log for more details. java.lang.NullPointerException
出现错误。有关更多详细信息，请参阅错误日志。java.lang.NullPointerException
I then try clicking Eclipse > Preferences > Java > Installed JREs and see an empty list. I try to Add... a Standard VM but I cannot find the location of my JRE. /Library/Java/JavaVirtualMachines/ is empty and /System/Library/Frameworks/JavaVM.framework does not exist.
然后我尝试单击 Eclipse > Preferences > Java > Installed JREs 并看到一个空列表。我尝试添加...一个标准 VM，但找不到 JRE 的位置。/Library/Java/JavaVirtualMachines/ 为空且 /System/Library/Frameworks/JavaVM.framework 不存在。
Does anyone know how I might fix this problem?
有谁知道我如何解决这个问题？
回答by VonC
You can follow instruction to install a JDL (which includes a JRE) for Mac here.
您可以在此处按照说明为 Mac 安装 JDL（包括 JRE）。
Depending on your processor, the downloaded file has one of the following names:
jdk-8uversion-macosx-amd64.dmgjdk-8uversion-macosx-x64.dmgWhere version is 6 or later.
- Download the file.
- Before the file can be downloaded, you must accept the license agreement.
- From either the Downloads window of the browser, or from the file browser, double click the .dmg file to launch it.
A Finder window appears containing an icon of an open box and the name of the .pkg file.
根据您的处理器，下载的文件具有以下名称之一：
jdk-8uversion-macosx-amd64.dmgjdk-8uversion-macosx-x64.dmg版本为 6 或更高版本。
- 下载文件。
- 在下载文件之前，您必须接受许可协议。
- 从浏览器的“下载”窗口或文件浏览器，双击 .dmg 文件以启动它。
出现一个 Finder 窗口，其中包含一个打开框的图标和 .pkg 文件的名称。
- Double click the package icon to launch the Install app.
- 双击包图标以启动安装应用程序。
回答by jyothiv
This worked for me :
这对我有用：
- Right click on your project -> Build Path -> Configure Build Path
- Go to 'Libraries' tab
- Click on 'Add Library' -> JRE System Library -> Next -> Workspace default JRE (or you can add Alternate JRE) -> Finish
- 右键单击您的项目 -> 构建路径 -> 配置构建路径
- 转到“库”选项卡
- 单击“添加库”-> JRE 系统库-> 下一步-> 工作区默认 JRE（或者您可以添加备用 JRE）-> 完成
回答by JamesB
Right Button in the Project:Build Path >> Configure Build Path >> Click JRE System Library >> Remove
项目中右键：构建路径>>配置构建路径>>点击JRE系统库>>删除
Then click:Add Library >> JRE System Library >> Next >> Installed JREs >> Select JRE >> Ok >> Finish >> Apply
然后点击：添加库>>JRE系统库>>下一步>>安装的JREs>>选择JRE>>确定>>完成>>应用
