Apache Beam 執行

Question

我正在關注這個例子，但在步驟中：運行 WordCount ，通過直接命令

$ mvn compile exec:java -Dexec.mainClass=org.apache.beam.examples.WordCount \
 -Dexec.args="--inputFile=pom.xml --output=counts" -Pdirect-runner

最后我有這個錯誤：

[INFO] -----------------------------------------------------------------------

[INFO] BUILD FAILURE

[INFO] ------------------------------------------------------------------------

[INFO] Total time: 12.065 s

[INFO] Finished at: 2018-10-02T17:36:05+02:00

[INFO] ------------------------------------------------------------------------

[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.6.0:java (default-cli) on project word-count-beam: An exception occured while executing the Java class. java.lang.UnsupportedOperationException: Cannot define class using reflection: Could not find sun.misc.Unsafe -> [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] 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

Answer 1

您需要使用Java 開發工具包 (JDK) 版本 8 。 驗證 JAVA_HOME 環境變量是否已設置並指向您的 JDK 安裝。

要更好地理解這一變化，請閱讀：

• 官方功能請求JEP 260: Encapsulate Most Internal APIs 。
• 了解 sun.misc.Unsafe