java - 将 Google App Engine 应用程序 (Java) 导入 Eclipse

Question

首先:我不确定它是否适合这样的问题，所以如果您认为有更多合适的空间，请移动它。

我有一些基于 GAE 的项目需要导入到 Eclipse 中。我下载了新版本的 Eclipse EE (Kepler) 并安装了 App Engine 插件。然后我从源代码创建了一个新项目并尝试配置它......这就是问题开始的地方。

当我尝试构建项目时出现 3 个错误:

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

第一个错误说找不到一些 jar 文件，但显示的路径很奇怪。实际上它缺少指向工作区的部分 (D:\workspaces\eclipse GAE\) - 休息，从 incap-ii 开始就可以了。我尝试配置构建路径或更改 SDK 路径:

如您所见，我在配置中有 2 个 SDK。但是，我无法更改此项目中使用的那个:我从列表中选择 appengine-java-1.8.5 - 1.8.5，单击“确定”，对话框窗口关闭但错误仍然存​​在，一旦我再次打开对话框，我就会看到更改未保存(仍然使用错误的)。

是否有某些我应该更改的特定配置？

[编辑]一些更多的解释/屏幕(如下)。正如您在屏幕 1 中所见，我 (preferences\google\appengine) 我已经配置了 2 个 appEgines:一个是我手动下载和提取的(在屏幕上选中)，另一个是通过 Google App Engine 插件下载的。无论如何，当我现在检查项目首选项时，我看到 3 个引擎(屏幕 2)- 另一个(已选择)在项目目录中。正如我所说，我无法更改它，因为在我单击“确定”后，更改不会保存。但是，当我打开“配置 SDK”(屏幕 3)时，我只能看到两个外部引擎。我勒个去？我试图重新安装整个 Eclipse，但它没有帮助......另外，当我使用 Netbeans 构建它并从 shell 运行时，我能够使用手动下载的 AppEngine 运行这个项目，所以引擎可能没问题......

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Answer 1

我遇到的一个问题可能和你的一样。就我而言，Eclipse 说:

The 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' on the project's build path is not valid (SDK location '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' is not a directory)

这意味着 Eclipse 在搜索 App Engine SDK 安装目录之前在本地 Maven 存储库 (~/.m2/repository) 中找到了 App Engine SDK 二进制文件。

(1) 在 Eclipse 中关闭您的项目。

(2) 使用文本编辑器打开项目的 .classpath，如果它包含与 App Engine 相关的类路径，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) 删除所有 classpathentry 的(与 App Engine jar 文件相关)。

(4) 添加 GAE_CONTAINER 在 MAVEN2_CLASSPATH_CONTAINER 之前。

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

(5) 重新打开您的项目。