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我是 Bazel 的新手，正在学习它的构建工作，目前我正在尝试从 Maven 项目构建 bazel，请告诉我如何使它工作，谢谢。

这是我要定义的WORKSPACE文件：

maven_jar(
  name = "junit",
  artifact = "junit:junit:3.8.1",
)

maven_jar(
  name = "log4j1",
  artifact = "org.apache.logging.log4j:log4j-core:2.6.2",
)

maven_jar(
  name = "log4j2",
  artifact = "org.apache.logging.log4j:log4j-api:2.6.2",
)
.....

这是我要定义 的BUILD文件：

package(default_visibility = ["//visibility:public"])

java_binary(
    name = "everything",
    srcs = glob(["src/main/java/**/*.java"]),
    resources = glob(["src/main/resources/**"]),
     main_class = "src/main/java/com/test/test/test/App",
    deps = [
    "@junit//jar",
    "@log4j1//jar",
    "@log4j2//jar",
    "@jackson//jar",
    "@jsonsimple//jar",
    "@commonsdbutils//jar",
    "@commons//jar",
    "@guava//jar",
    "@poi//jar"],

)

这是我得到的 Bazel 构建结果：

mbp:bazel_test me$ bazel build //:everything
INFO: Analysed target //:everything (1 packages loaded).
INFO: Found 1 target...
    ERROR: /Users/me/git/test/test/BUILD:4:1: Building everything-class.jar (104 source files) failed (Exit 1)
    src/main/java/com/test/test/test/Testapp.java:13: error: cannot find symbol
    import org.apache.poi.ss.usermodel.Cell;
                                      ^
      symbol:   class Cell
      location: program package org.apache.poi.ss.usermodel
      .....
      Target //:everything failed to build
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1 回答 1

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我在这里看到两个问题：

  • 该main_class属性应使用点而不是斜线：

 java_binary(
    name = "everything",
    srcs = glob(["src/main/java/**/*.java"]),
    main_class = "src.main.java.com.test.test.test.App",
    ...
  • poi jar 中没有org.apache.poi.ss.usermodel.Cell类。

找到罐子的名称：

$ bazel query --output=build @poi//jar
...
java_import(
  name = "jar",
  visibility = ["//visibility:public"],
  jars = ["@poi//jar:poi-ooxml-3.9.jar"],
  srcjar = "@poi//jar:poi-ooxml-3.9-sources.jar",
)

包的位置是$(bazel info output_base)/external/poi，现在我们知道（从上面输出srcs中的属性bazel query）该文件被调用poi-ooxml-3.9.jar：

$ unzip -l $(bazel info output_base)/external/poi/jar/poi-ooxml-3.9.jar | grep "org.apache.poi.ss.usermodel"
        0  2012-11-26 17:14   org/apache/poi/ss/usermodel/
     2970  2012-11-26 17:14   org/apache/poi/ss/usermodel/WorkbookFactory.class
于 2018-02-05T09:25:56.883 回答