我设法找到了问题并加以解决。我去了：
帮助->关于Eclipse IDE->单击安装详细信息->选项卡配置->单击查看错误日志

默认浏览器打开，我注意到以下堆栈跟踪：

 ！ENTRY org.eclipse.ui 4 0 2018- 06-28 10：38：21.036 
！MESSAGE未处理的事件循环异常
！STACK 0 
 org.eclipse.e4.core.di.InjectionException：java.lang.IllegalArgumentException：非法字符索引16的路径：file：/ C：/ Eclipse Photon / eclipse / configuration / 
 at org.eclipse.e4.core.internal.di.MethodRequestor.execute（MethodRequestor.java:65）
 

这是我命名的文件夹中的空格字符： Eclipse Photon。我将其重命名为 EclipsePhoton，并且市场成功打开。

简短的回答：请确保Eclipse安装文件路径中没有空格。 / strong>

I just installed Eclipse Photon. I migraded one project from Oxygen to it - everything is working fine.

The problem I noticed is that I cannot open the Eclipse Marketplace. Whenever I click on it, I get the loading circle for 1-2 seconds then nothing happens.

I also tried this on a completely new empty workspace (so no old .metadata) - same behavior. I also restarted PC - didn't help.

Any ideas? Is it me only that has this problem or is it a bug due to the new version?

Thanks.

I managed to find the problem and fix it. I went to: Help -> About Eclipse IDE -> clicked on "Installation Details" -> tab "Configuration" -> Clicked on "View Error Log"

The default browser opened and there I noticed the following stack trace:

!ENTRY org.eclipse.ui 4 0 2018-06-28 10:38:21.036
!MESSAGE Unhandled event loop exception
!STACK 0
org.eclipse.e4.core.di.InjectionException: java.lang.IllegalArgumentException: Illegal character in path at index 16: file:/C:/Eclipse Photon/eclipse/configuration/
    at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:65)

It was the space character in the folder named by me: "Eclipse Photon". I renamed it to "EclipsePhoton" and the marketplace opened successfully.

Short answer: Make sure you do not have any spaces in the Eclipse installation file path.