在Maven清理/构建和部署后，Java App Engine调用GcsService.createOrReplace导致Stopwatch.createUnstarted noSuchMethodError [英] Java App Engine call to GcsService.createOrReplace results in Stopwatch.createUnstarted noSuchMethodError after Maven clean/build and deploy

问题描述

我为我的GAE Java项目使用了Intellij和Maven。我从 createOrReplace 时遇到一些奇怪的问题/ appengine / tools / cloudstorage / GcsServicerel =nofollow noreferrer> Google Cloud Storage中的GcsService ，这取决于我在我的项目中编辑单个文件。这里发生了什么：

我在Github上有一个稳定的版本。我签出该修订并使用intellij配置来部署应用程序。我的部署看起来像这样： /Library/Java/JavaVirtualMachines/jdk1.7.0_25.jdk/Contents/Home/bin/java -Dfile.encoding = UTF-8 -classpath /Users/me/.m2/repository/com/ google / appengine / appengine-java-sdk / 1.9.15 / appengine-java-sdk / appengine-java-sdk-1.9.15 / lib / appengine-tools-api.jar com.google.appengine.tools.admin.AppCfg --email=[e-mail] --passin --no_cookies更新/Users/me/git/blunka/harry-gcp/module-ear/target/module-ear-1.0//code>

然后给特定的源文件添加评论。我重新部署了，并且我注意到 / target 下的一些输出文件已经改变。我的应用程序现在因此错误而中断：

  java.lang.NoSuchMethodError：com.google.common.base.Stopwatch.createUnstarted （）LCOM /谷歌/普通/碱/秒表; 
 at com.google.appengine.tools.cloudstorage.RetryHelper.runWithRetries（RetryHelper.java:156）
 at com.google.appengine.tools.cloudstorage.GcsServiceImpl.createOrReplace（GcsServiceImpl.java:70） 
  

我现在删除该评论并再次部署。我做了一个 git status ，注意 / target 下的一些已更改的文件不再存在。我的应用程序再次正常工作。

当我查看已修改类的已反编译的.class文件时，它们是相同的。

  [信息] +  -  com.google.api-client ：google-api-client-appengine：jar：1.19.0：编译
 [INFO] | \- com.google.api-client：google-api-client：jar：1.19.0：compile 
 [INFO] | \- com.google.guava：guava-jdk5：jar：13.0：编译
 [INFO] +  -  com.google.appengine.tools:appengine-gcs-client:jar:RELEASE:compile 
 [INFO] | \-（com.google.guava：guava：jar：18.0：编译 - 省略重复）
 [INFO] +  -  com.google.guava：guava：jar：18.0：compile 
 [INFO ] \- com.googlecode.objectify：objectify：jar：5.1.1：编译
 [INFO] \-（com.google.guava：guava：jar：17.0：compile  - 在与18.0冲突时省略） 
  

我有几个问题：

1. 为什么评论会导致我的输出文件发生变化？


2. 为什么从注释中更改输出文件会导致应用程序行为发生变化，即使反编译如果guava（google.common.base）发生冲突，我该如何解决它们？


3. 如何防止某些东西这样的情况发生在未来？
@ ben-manes在他的评论中是正确的。我有同样的问题，他最后的消息帮助了我。我只是想将它作为答案，因为不是每个人都会看到评论。




google-api-client取决于guava-jdk5，它与guava- 18+，由appengine-gcs-client使用
$ b

 < dependency> 
< groupId> com.google.api-client< / groupId> 
< artifactId> google-api-client-appengine< / artifactId> 
< version> 1.20.0< / version> 
<排除项> 
 <！ - 与appengine-gcs-client中的另一个番石榴版本产生冲突 - > 
<排除> 
< groupId> com.google.guava< / groupId> 
< artifactId> guava-jdk5< / artifactId> 
< /排除> 
< /排除> 
< /依赖关系> 
  




I am using Intellij and Maven for my GAE Java project. I have some strange issues with calling createOrReplace from GcsService in Google Cloud Storage, that is dependent on me editing a single file in my project. Here is what happens:

I have a stable revision on Github. I checkout that revision and use an intellij configuration to deploy the app. My deployment looks like this: After the clean install and build, this is the command that gets executed: /Library/Java/JavaVirtualMachines/jdk1.7.0_25.jdk/Contents/Home/bin/java -Dfile.encoding=UTF-8 -classpath /Users/me/.m2/repository/com/google/appengine/appengine-java-sdk/1.9.15/appengine-java-sdk/appengine-java-sdk-1.9.15/lib/appengine-tools-api.jar com.google.appengine.tools.admin.AppCfg --email=[e-mail] --passin --no_cookies update /Users/me/git/blunka/harry-gcp/module-ear/target/module-ear-1.0

I then add a comment to a specific source file. I redeploy and I notice a bunch of output files under /target have changed. My app is now broken with this error:

java.lang.NoSuchMethodError: com.google.common.base.Stopwatch.createUnstarted()Lcom/google/common/base/Stopwatch;
    at com.google.appengine.tools.cloudstorage.RetryHelper.runWithRetries(RetryHelper.java:156)
    at com.google.appengine.tools.cloudstorage.GcsServiceImpl.createOrReplace(GcsServiceImpl.java:70)

I now delete that comment and deploy again. I do a git status and notice that some of the changed files under /target are no longer there. My app works fine again.

When I look at the decompiled .class files of the modified class, they are identical. Here is my dep tree for the module that is throwing the error:

[INFO] +- com.google.api-client:google-api-client-appengine:jar:1.19.0:compile
[INFO] |  \- com.google.api-client:google-api-client:jar:1.19.0:compile
[INFO] |     \- com.google.guava:guava-jdk5:jar:13.0:compile
[INFO] +- com.google.appengine.tools:appengine-gcs-client:jar:RELEASE:compile
[INFO] |  \- (com.google.guava:guava:jar:18.0:compile - omitted for duplicate)
[INFO] +- com.google.guava:guava:jar:18.0:compile
[INFO] \- com.googlecode.objectify:objectify:jar:5.1.1:compile
[INFO]    \- (com.google.guava:guava:jar:17.0:compile - omitted for conflict with 18.0)

I have a few questions:

1. Why does a comment cause my output files to change?
2. Why do changed output files from a comment cause a change in behavior of the app, even though the decompiled source is the same?
3. If guava (google.common.base) has collisions, how can I fix them?
4. How can I prevent something like this from happening in the future?

解决方案

Sorry for "stealing" the answer, but @ben-manes is right in his comment. I had the same problem and his last message helped me. I just want to make this as an answer, because not everybody looks through comments.

google-api-client depends on guava-jdk5, which creates a conflict with guava-18+, used by appengine-gcs-client

<dependency>
    <groupId>com.google.api-client</groupId>
    <artifactId>google-api-client-appengine</artifactId>
    <version>1.20.0</version>
    <exclusions>
        <!-- creates conflicts with another guava version in appengine-gcs-client -->
        <exclusion>
            <groupId>com.google.guava</groupId>
            <artifactId>guava-jdk5</artifactId>
        </exclusion>
    </exclusions>
</dependency>

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