將Google App Engine應用程序（Java）導入到Eclipse中

Question

首先：我不確定它是否適合這樣的問題，所以如果您認爲它有更適合的空間，請將其移動。

我有一些基於GAE的項目需要導入到Eclipse中。我下載了Eclipse EE的新版本（Kepler）並安裝了App Engine Plugin。然後，我從源創建了一個新項目並嘗試對其進行配置......這是問題開始的地方。

當我嘗試建立的項目，我得到3個錯誤：

The App Engine SDK '\incap-ii\build\web\WEB-INF\lib\appengine-api-1.0-sdk-1.8.0.jar' on the project's build path is not valid (SDK directory 'D:\incap-ii\build\web\WEB-INF\lib\appengine-api-1.0-sdk-1.8.0.jar' does not exist) incap-ii  Unknown Google App Engine Problem 
Project 'incap-ii' is missing required library: 'war/WEB-INF/lib/jsr107cache-1.1.jar' incap-ii  Build path Build Path Problem 
The project cannot be built until build path errors are resolved incap-ii  Unknown Java Problem 

第一個錯誤說，一些jar文件無法找到，但顯示的路徑很奇怪。實際上它缺少一個指向工作區的部分（D:\workspaces\eclipse GAE\） - 從incap-ii開始休息很好。我試圖配置構建路徑或更改SDK路徑：

正如你可以看到我在配置2 SDK。然而，我無法改變這個項目中使用的一個：我從列表中選擇appengine-java-1.8.5-1.8.5，點擊確定，對話框窗口關閉，但錯誤仍然存​​在，一旦我再次打開對話框，我看到更改未保存（仍然使用錯誤的）。

是否有某些特定配置需要更改？ （編輯] 更多解釋/ screes（下）正如你可以在1號屏幕（preferences \ google \ appengine）中看到的那樣，我配置了2個appEgines：我手動下載並提取的一個（在屏幕上檢查），另一個是由Google App Engine Plugin下載的。無論如何，當我檢查項目首選項時，我會看到3個引擎（屏幕2） - 另外一個（選定）位於項目目錄中。正如我所說，我不能改變這一點，因爲我點擊「確定」後，更改不會保存。但是，當我打開「配置SDK」（屏幕3）時，我只能看到兩個外部引擎。我勒個去？我試圖重新安裝整個Eclipse，但它沒有幫助...另外，我能夠運行此項目與AppEngine手動下載時，我用Netbeans構建它，並從外殼運行，所以引擎可能是罰款...

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Answer 1

它看起來像有一個與你的SDK的配置有問題。

您的屏幕截圖顯示了您的項目配置，但我認爲您需要查看首選項 - > google - >應用引擎，並檢查SDK的配置。我認爲你可能無法爲自己的項目選擇一個會顯示錯誤，但無論哪種方式，你可能想要刪除並重新添加它，並確保它的路徑是有效的。

Answer 2

我遇到的問題可能與您的問題相同。在我的情況是，Eclipse說：

App Engine的SDK 「C：\用戶\ Takahiko.m2 \庫\ COM \谷歌\ AppEngine上\ AppEngine上-API 1.0 SDK \ 1.8.8 \ appengine- （SDK位置 'C：\ Users \ Takahiko.m2 \ repository \ com \ google \ appengine \ appengine-api-1.0-sdk'）。 \ 1.8.8 \應用服務引擎的API-1.0-SDK-1.8.8。罈子 不是目錄）

這意味着Eclipse中發現的App Engine SDK的二進制文件之前搜索的App Engine SDK的安裝目錄下的本地的倉庫（〜/ .m2目錄/庫）。

（1）在Eclipse中關閉您的項目。

用文本編輯器項目的（2）打開的.classpath，如果它包含classpathentry的相關到App Engine類似如下：

<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/shared/appengine-local-runtime-shared.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/shared/el-api.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/shared/jsp/repackaged-appengine-ant-1.7.1.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/shared/jsp/repackaged-appengine-ant-launcher-1.7.1.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/shared/jsp/repackaged-appengine-jasper-6.0.29.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/shared/jsp/repackaged-appengine-jasper-el-6.0.29.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/shared/jsp/repackaged-appengine-tomcat-juli-6.0.29.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/shared/jsp-api.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/shared/servlet-api.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/appengine-tools-api.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/opt/user/appengine-api-labs/v1/appengine-api-labs.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/opt/user/appengine-endpoints/v1/appengine-endpoints-deps.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/opt/user/appengine-endpoints/v1/appengine-endpoints.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/opt/user/datanucleus/v2/asm-4.0.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/opt/user/datanucleus/v2/datanucleus-api-jdo-3.1.3.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/opt/user/datanucleus/v2/datanucleus-api-jpa-3.1.3.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/opt/user/datanucleus/v2/datanucleus-appengine-2.1.2.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/opt/user/datanucleus/v2/datanucleus-core-3.1.3.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/opt/user/datanucleus/v2/geronimo-jpa_2.0_spec-1.0.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/opt/user/datanucleus/v2/jdo-api-3.0.1.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/opt/user/datanucleus/v2/jta-1.1.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/opt/user/jsr107/v1/appengine-jsr107cache-1.8.8.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/opt/user/jsr107/v1/jsr107cache-1.1.jar"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 
<classpathentry kind="lib" path="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/lib/user/appengine-api-1.0-sdk-1.8.8.jar" sourcepath="C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/src/user/appengine-api-1.0-sdk-1.8.8-src.zip"> 
    <attributes> 
     <attribute name="javadoc_location" value="file:/C:/Eclipse/eclipse-juno/plugins/com.google.appengine.eclipse.sdkbundle_1.8.8/appengine-java-sdk-1.8.8/docs/javadoc/"/> 
    </attributes> 
</classpathentry> 

（3）刪除所有classpathentry的（相關到App Engine jar文件）。

（4）前 MAVEN2_CLASSPATH_CONTAINER添加GAE_CONTAINER。

<classpathentry kind="con" path="com.google.appengine.eclipse.core.GAE_CONTAINER"/> 

（5）重新打開你的項目。