级联示例无法编译？

java gradle hadoop cascading scalding

2022-09-01 02:12:30

在 shell 中，我在 Impatient/part1 目录中键入了 gradle。输出如下。错误是“找不到 org.apache.hadoop.mapred.JobConf 的类文件”。为什么它无法编译？cleanJar

:clean UP-TO-DATE
:compileJava
Download http://conjars.org/repo/cascading/cascading-core/2.0.1/cascading-core-2.0.1.pom
Download http://conjars.org/repo/cascading/cascading-hadoop/2.0.1/cascading-hadoop-2.0.1.pom
Download http://conjars.org/repo/riffle/riffle/0.1-dev/riffle-0.1-dev.pom
Download http://repo1.maven.org/maven2/org/slf4j/slf4j-api/1.6.1/slf4j-api-1.6.1.pom
Download http://repo1.maven.org/maven2/org/slf4j/slf4j-parent/1.6.1/slf4j-parent-1.6.1.pom
Download http://repo1.maven.org/maven2/org/slf4j/slf4j-log4j12/1.6.1/slf4j-log4j12-1.6.1.pom
Download http://conjars.org/repo/thirdparty/jgrapht-jdk1.6/0.8.1/jgrapht-jdk1.6-0.8.1.pom
Download http://repo1.maven.org/maven2/org/codehaus/janino/janino/2.5.16/janino-2.5.16.pom
Download http://conjars.org/repo/cascading/cascading-core/2.0.1/cascading-core-2.0.1.jar
Download http://conjars.org/repo/cascading/cascading-hadoop/2.0.1/cascading-hadoop-2.0.1.jar
Download http://conjars.org/repo/riffle/riffle/0.1-dev/riffle-0.1-dev.jar
Download http://repo1.maven.org/maven2/org/slf4j/slf4j-api/1.6.1/slf4j-api-1.6.1.jar
Download http://repo1.maven.org/maven2/org/slf4j/slf4j-log4j12/1.6.1/slf4j-log4j12-1.6.1.jar
Download http://conjars.org/repo/thirdparty/jgrapht-jdk1.6/0.8.1/jgrapht-jdk1.6-0.8.1.jar
Download http://repo1.maven.org/maven2/org/codehaus/janino/janino/2.5.16/janino-2.5.16.jar
/home/is_admin/lab/cascading/Impatient/part1/src/main/java/impatient/Main.java:50: error: cannot access JobConf
    Tap inTap = new Hfs( new TextDelimited( true, "\t" ), inPath );
                ^
  class file for org.apache.hadoop.mapred.JobConf not found
1 error
:compileJava FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileJava'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 22.599 secs

答案 1

尝试使用Java 6，gradle在Java 7上有一些已知问题

答案 2

将 hadoop-core-1.x.y.jar 从 hadoop 发行版添加到 path。

这在CoPA的例子中对我有用。我添加了 eclipse 构建路径。

将其添加到 gradle 依赖项{} 部分

compile（ group： 'org.apache.hadoop'， name： 'hadoop-core'， version： '1.2.0' ）