將Google App Engine應用程序（Java）導入Eclipse

Question

首先：我不確定這個問題是不是一個合適的地方所以如果您認為有更多的適合空間，請移動它。

我有一些基於GAE的項目，我需要導入到Eclipse。 我下載了Eclipse EE（Kepler）的新版本並安裝了App Engine插件。 然后我從源代碼創建了一個新項目，並嘗試對其進行配置......這就是問題開始的地方。

當我嘗試構建項目時，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

第一個錯誤說找不到某些jar文件，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\\ ） - 休息，從incap-ii開始很好。 我嘗試配置Build Path或更改SDK路徑：

如您所見，我在配置中有2個SDK。 但是，我無法更改此項目中使用的那個：我從列表中選擇appengine-java-1.8.5 - 1.8.5，單擊確定，對話框窗口關閉但錯誤仍然存​​在，一旦我再次打開對話框，我看到了更改未保存（仍使用錯誤的更改）。

某些特定的配置是否應該改變？

[編輯]一些更多的解釋/ screes（下面）。 正如你在第1號屏幕上看到的我（preferences \\ google \\ appengine）我已經配置了2個appEgines：我手動下載和提取的（在屏幕上檢查）和第二個由Google App Engine插件下載的appEgines。 無論如何，當我檢查項目首選項時，我看到3個引擎（屏幕2） - 額外的一個（選中）在項目目錄中。 正如我所說，我不能改變它，因為在我點擊“確定”后，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...而且，當我使用Netbeans構建它並從shell運行時，我能夠手動下載AppEngine來運行這個項目，所以引擎可能很好......

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Answer 1

我遇到的問題可能和你的一樣。 就我而言，Eclipse說：

App Engine SDK'C：\\ Users \\ Takahiko.m2 \\ repository \\ com \\ google \\ appengine \\ appengine-api-1.0-sdk \\ 1.8.8 \\ appengine-api-1.0-sdk-1.8.8.jar'項目的構建路徑無效（SDK位置'C：\\ Users \\ Takahiko.m2 \\ repository \\ com \\ google \\ appengine \\ appengine-api-1.0-sdk \\ 1.8.8 \\ appengine-api-1.0-sdk-1.8.8 .jar'不是目錄）

這意味着Eclipse 在搜索App Engine SDK的安裝目錄之前 ，在本地maven存儲庫（〜/ .m2 / repository）中找到了App Engine SDK二進制文件。

（1）在Eclipse中關閉項目 。

（2）使用文本編輯器打開項目的.classpath ，如果它包含與App Engine相關的classpathentry，如下所示：

<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 （與App Engine jar文件相關）。

（4）在MAVEN2_CLASSPATH_CONTAINER 之前 添加 GAE_CONTAINER。

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

（5）重新打開你的項目 。

Answer 2

看起來SDK的配置存在問題。

您的屏幕截圖顯示了項目的配置，但我認為您需要查看首選項 - > google - > app engine，並檢查SDK的配置。 我認為您項目無法選擇的項目可能會在那里顯示錯誤，但無論哪種方式，您都可能希望刪除並重新添加它並確保其路徑有效。