编译Java运行时库时出现Protobuf错误

Question

我正在尝试为协议缓冲区构建Java运行时库。我在Windows和OS X上都犯了错误，因为我遵循了Protocol Buffers项目（从中克隆而来）中Java目录下的自述指令https://github.com/google/protobuf).

当我在protobuf/java目录下运行mvn测试时，出现了以下错误。

OS X的错误

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-antrun-plugin:1.8:run (generate-sources) on project protobuf-java: An Ant BuildException has occured: The following error occurred while executing this line:
[ERROR] /Users/wangsa/Work/ProtoBuffer/protobuf/java/core/generate-sources-build.xml:4: Execute failed: java.io.IOException: Cannot run program "/Users/wangsa/Work/ProtoBuffer/protobuf/java/core/../../src/protoc" (in directory "/Users/wangsa/Work/ProtoBuffer/protobuf/java/core"): error=2, No such file or directory

来自Windows的错误

[INFO] Scanning for projects...
[WARNING]
[WARNING] Some problems were encountered while building the effective model for com.google.protobuf:protobuf-java:bundle:2.6.1
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-compiler-plugin is missing. @ line 57, column 15
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-surefire-plugin is missing. @ line 64, column 15
[WARNING] 'build.plugins.plugin.version' for org.apache.felix:maven-bundle-plugin is missing. @ line 143, column 15
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING]
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Protocol Buffer Java API 2.6.1
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-antrun-plugin:1.3:run (generate-sources) @ protobuf-java ---
[INFO] Executing tasks
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.030 s
[INFO] Finished at: 2016-06-07T10:03:48+12:00
[INFO] Final Memory: 11M/245M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-antrun-plugin:1.3:run (generate-sources) on project protobuf-java: An Ant BuildException has occured: Execute failed: java.io.IOException: Cannot run program "..\src\protoc": CreateProcess error=2, The system cannot find the file specified -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

更多细节

• Maven安装正确（3.3.9版）

有人能看出哪里出了问题吗？

编辑：做这个构建过程对我来说是相当新的，我假设如果这个过程成功完成，我会得到一个. jar文件，我可以将其包含在我的android程序中，以便使用从我的proto文件生成的Probuf方法来序列化数据并通过TCP发送，这是我的最终目标。




Answer 1

我的项目中也有同样的问题，要解决这个问题，请在PATH环境变量中添加protocbin目录。

有时，即使在重启之后，eclipse也不会选择添加的路径，如果发生这种情况，只需删除。元数据工作区中的目录，它将工作。

现代操作系统可以立即识别环境变量的变化，但eclipse需要意识到这一点，它在大多数情况下都是在首次加载后从缓存中读取。

Answer 2

我也面临同样的问题。进行了以下更改以使其正常工作：

>

从protoc-3.2.0-windows-x86_64重命名可执行文件。从exe到protoc。exe

从…运行mvn测试。。\protocol_buf\protobuf-3.2.0\java文件夹

Answer 3

最终通过以下更改使其工作：

更改1：我更改为使用来自的java源代码https://github.com/google/protobuf/releases/tag/v2.6.1而不是https://github.com/google/protobuf/tree/v2.6.1/java

改变2：对于Windows机器，我需要复制protoc。exe到位于java文件夹父文件夹中的src文件夹。之前我复制了protoc。exe进入java文件夹中的src，该文件夹不起作用。

之后，我在java文件夹中运行了mvn测试，一切正常。我能够生成。jar文件使用mvn安装，然后根据自述文件使用mvn包。

注意：我不明白为什么protobuf/tree/v2中的代码会被删除。6.1不起作用，但因为在github上，构建状态也表示失败（截至6月7日），所以我认为这就是原因。