我通过以下操作将appengine-gcs-client添加到我的Google AppEngine Standard项目中:
*<dependency>
<groupId>com.google.appengine.tools</groupId>
<artifactId>appengine-gcs-client</artifactId>
<version>0.7</version>
</dependency>*
(遵循此页面上的指示:https://cloud.google.com/appengine/docs/standard/java/googlecloudstorageclient/setting-up-cloud-storage)
编译项目会引发以下错误(几天前没有问题):
[错误]无法在项目myproject2上执行目标:无法解析项目com.myproject2:myproject2:war:1.0-SNAPSHOT的依赖项:无法在com.google.appengine.tools:appengine-上收集依赖项gcs-client:jar:0.7-> com.google.api-client:google-api-client-appengine:jar:1.24.1-> com.google.oauth-client:google-oauth-client-appengine:jar: 1.24.1-> com.google.http-client:google-http-client-appengine:jar:1.24.1:无法读取com.google.http-client:google-http-client-appengine:jar的工件描述符:1.24.1:在本地https://repo.maven.apache.org/maven2中找不到com.google.http-client:google-http-client-parent:pom:1.24.1的内容已缓存在本地存储库中,直到更新后才会重新尝试解析中心间隔已过去或强制进行了更新-> [帮助1]
似乎Google刚刚在依赖树中创建了一些错误。
有什么办法可以解决它,甚至只是临时解决方法?
使用完整的pom更新我的问题,该错误会重现错误:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<packaging>war</packaging>
<version>0.1.0-SNAPSHOT</version>
<groupId>com.myproject2</groupId>
<artifactId>myproject2</artifactId>
<properties>
<appengine.maven.plugin.version>1.3.1</appengine.maven.plugin.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.showDeprecation>true</maven.compiler.showDeprecation>
</properties>
<prerequisites>
<maven>3.3.9</maven>
</prerequisites>
<dependencies>
<!-- Compile/runtime dependencies -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>javax.servlet.jsp-api</artifactId>
<version>2.3.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-api-1.0-sdk</artifactId>
<version>1.9.59</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- For cloud storage https://cloud.google.com/appengine/docs/standard/java/googlecloudstorageclient/setting-up-cloud-storage -->
<dependency>
<groupId>com.google.appengine.tools</groupId>
<artifactId>appengine-gcs-client</artifactId>
<version>0.7</version>
</dependency>
<!-- Test Dependencies -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.endpoints</groupId>
<artifactId>endpoints-framework</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>com.googlecode.objectify</groupId>
<artifactId>objectify</artifactId>
<version>6.0</version>
</dependency>
</dependencies>
<build>
<!-- for hot reload of the web application -->
<outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>versions-maven-plugin</artifactId>
<version>2.3</version>
<executions>
<execution>
<phase>compile</phase>
<goals>
<goal>display-dependency-updates</goal>
<goal>display-plugin-updates</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>com.google.cloud.tools</groupId>
<artifactId>appengine-maven-plugin</artifactId>
<version>${appengine.maven.plugin.version}</version>
</plugin>
</plugins>
</build>
</project>
答案 0 :(得分:4)
似乎Google进行了一些重命名(它们删除了artifactIds的“ -appengine”部分),这在1.24.1版本中不起作用。尝试将gcs依赖项替换为以下内容:
<dependency>
<groupId>com.google.appengine.tools</groupId>
<artifactId>appengine-gcs-client</artifactId>
<version>0.7</version>
<exclusions>
<exclusion>
<groupId>com.google.http-client</groupId>
<artifactId>*</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.google.http-client</groupId>
<artifactId>google-http-client-appengine</artifactId>
<version>1.23.0</version>
</dependency>
它将排除所有与1.24.1版本无关的依赖项,而是使用以前的1.23.0。您可能最终需要强制Maven使用“ -U”标志来更新远程依赖关系,例如,
mvn -U package
答案 1 :(得分:3)
我面临着appengine-mapreduce依赖关系的错误。 通过排除引发错误的依赖项来解决此问题。
原始地图可减少依赖性
<dependency>
<groupId>com.google.appengine.tools</groupId>
<artifactId>appengine-mapreduce</artifactId>
<version>0.9</version>
</dependency>
显示的错误
无法解决项目的依赖关系 PerpuleSmartShoppee:PerpuleSmartShoppee:war:0.0.1-SNAPSHOT:失败 在以下位置收集依赖项 com.google.appengine.tools:appengine-mapreduce:jar:0.9-> com.google.appengine.tools:appengine-gcs-client:jar:0.4.3-> com.google.api-client:google-api-client-appengine:jar:1.24.1-> com.google.oauth-client:google-oauth-client-appengine:jar:1.24.1-> com.google.http-client:google-http-client-appengine:jar:1.24.1:失败 读取工件描述符 com.google.http-client:google-http-client-appengine:jar:1.24.1: 找不到 com.google.http-client:google-http-client-parent:pom:1.24.1中 https://repo.maven.apache.org/maven2已缓存在本地 存储库,直到更新后才会重新尝试解析 中心间隔已过去或强制更新->
将其更改为以下内容以使构建正常工作
<dependency>
<groupId>com.google.api-client</groupId>
<artifactId>google-api-client</artifactId>
<version>1.22.0</version>
<exclusions>
<exclusion>
<artifactId>guava-jdk5</artifactId>
<groupId>com.google.guava</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.google.api-client</groupId>
<artifactId>google-api-client-appengine</artifactId>
<version>1.22.0</version>
<exclusions>
<exclusion>
<artifactId>guava</artifactId>
<groupId>com.google.guava</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.google.appengine.tools</groupId>
<artifactId>appengine-gcs-client</artifactId>
<version>0.3</version>
<exclusions>
<exclusion>
<artifactId>guava</artifactId>
<groupId>com.google.guava</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.google.appengine.tools</groupId>
<artifactId>appengine-mapreduce</artifactId>
<version>0.9</version>
<exclusions>
<exclusion>
<artifactId>guava</artifactId>
<groupId>com.google.guava</groupId>
</exclusion>
<exclusion>
<artifactId>appengine-gcs-client</artifactId>
<groupId>com.google.appengine.tools</groupId>
</exclusion>
<exclusion>
<groupId>com.google.api-client</groupId>
<artifactId>google-api-client</artifactId>
</exclusion>
<exclusion>
<groupId>com.google.api-client</groupId>
<artifactId>google-api-client-appengine</artifactId>
</exclusion>
</exclusions>
</dependency>
答案 2 :(得分:3)
尝试再次运行它。昨天Google更新了Maven版本时,并未将完整更新推送到库中。从那以后,他们推了丢失的那一块,现在它应该可以正常工作,无需任何修改。
答案 3 :(得分:2)
昨天,Google显然未能为其com.google.http-client库的父级部署1.24.0版本。
他们还采用了不受欢迎的做法,即在appengine-gcs-client pom中声明其http客户端依赖项的范围:
<dependency>
<groupId>com.google.http-client</groupId>
<artifactId>google-http-client</artifactId>
<version>[1.19.0,2.0)</version>
</dependency>
<dependency>
<groupId>com.google.http-client</groupId>
<artifactId>google-http-client-jackson2</artifactId>
<version>[1.19,2.0)</version>
</dependency>
因此,当他们昨天部署新版本1.24.0时,传递依赖项会自动升级,但是该版本是无效部署,导致失败。
这为我解决了问题
<dependency>
<groupId>com.google.appengine.tools</groupId>
<artifactId>appengine-gcs-client</artifactId>
<version>0.6</version>
<exclusions>
<exclusion>
<groupId>com.google.http-client</groupId>
<artifactId>google-http-client-jackson2</artifactId>
</exclusion>
<exclusion>
<groupId>com.google.http-client</groupId>
<artifactId>google-http-client</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.google.http-client</groupId>
<artifactId>google-http-client-jackson2</artifactId>
<version>1.23.0</version>
</dependency>
<dependency>
<groupId>com.google.http-client</groupId>
<artifactId>google-http-client</artifactId>
<version>1.23.0</version>
</dependency>
答案 4 :(得分:0)
尝试MavenUpdate-
强制更新 勾选---复选框ReleasesForceUpdate快照/发布