问题描述
我觉得我和这个人一起进行交流。我遵循Google App Engine入门指南（），一切顺利，直到我上传到App Engine。我收到500个错误，所以我检查了日志，发现：guestbook / SignGuestbookServlet：不支持的major.minor版本51.0]
然后我搜索这个问题（当然stackoverflow），并找到这个解决方案：
所以我将合规级别设置为1.6，然后在对话框的底部我得到警告当选择1.6合规性时，确保已安装并激活兼容的JRE（目前为1.7）。
我快乐点击确定，并提示重建。重建后，我会得到这个新错误：Java编译器级别与安装的Java项目方面的版本不匹配。
没有明知地使用项目我搜索一些帮助（再次在stackoverflow），并找到：
不幸的是，由于我没有使用Maven，而且当我提出项目的属性时，没有任何帮助项目属性 - > Project Facets面板让我改变一个版本。
所以似乎我被卡住了一些无法在Eclipse中编译或者无法部署的东西到App Engine。我知道我可能在这里遗漏了一些明显的东西，但是我不能把我的手指放在上面。
更新：我已经卸载了所有JRE和JDK，只重新安装jdk1.6.0_32。问题继续完全一样。
我也有同样的问题。我可以通过使用导航器视图和编辑.settings / org.eclipse.wst.common.project.facet.core.xml来解决问题，改为：
<？xml version =1.0encoding =UTF-8？>
< faceted-project>
< installed facet =javaversion =1.6/>
< / faceted-project>
此更改后，错误消失，我可以使用jre1成功运行DevMode中的GWT项目。 7但是java 1.6合规级别。
真的好像应该有一种方法可以通过项目配置编辑这个java facet，但是我在Juno找不到它。 / p>
I feel like I keep going in circles with this one. I followed the Getting Started guide for Google App Engine (https://developers.google.com/appengine/docs/java/gettingstarted/) in Eclipse and everything went relatively well until I uploaded it to the App Engine.
I was getting 500 errors so I checked the logs and found this: "guestbook/SignGuestbookServlet : Unsupported major.minor version 51.0]"
I then search for this problem (on stackoverflow, of course) and found this solution: Google App Engine and Java Version?
So I set the compliance level to 1.6 and then at the bottom of the dialog I get the warning that "When selecting 1.6 compliance, make sure to have a compatible JRE installed and activated (currently 1.7)".
I happy click OK, and it prompts for a rebuild. After the rebuild I then get this new error: "Java compiler level does not match the version of the installed Java project facet."
Not having knowingly used any facets in the project I do a search for some help (again on stackoverflow) and find this: "Faceted Project Prblem (Java Version Mismatch)" error message
Unfortunately it is not even close to being helpful because I am not used Maven, and when I bring up the properties of the project there is no Project Properties -> Project Facets panel for me to change a version on.
So it seems that I am stuck with something that either cannot be compiled in Eclipse or cannot be deployed to App Engine. I know that I am probably missing something obvious here but I can't quite put my finger on it.
UPDATE: I have uninstalled all JREs and JDKs, and reinstalled only jdk1.6.0_32. The problem continues exactly the same.
I had the same problem. I was able to resolve by using the Navigator view and editing the .settings/org.eclipse.wst.common.project.facet.core.xml, changing to:
<?xml version="1.0" encoding="UTF-8"?>
<faceted-project>
<installed facet="java" version="1.6"/>
</faceted-project>
After this change, the error went away and I could successfully run the GWT project in DevMode using jre1.7 but java 1.6 compliance level.
It really seems there should be a way to edit this java facet via project configuration, but I couldn't find it in Juno.
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