如何为命令 "mvn compile" 打印 class 加载模式？

Question

当我们运行、mvn 编译时，编译器选择 classes 从 classpath 中的各种 jar 加载。我想为这样的 class 加载打印 "class : jar" 组合的列表。

提前致谢。

Answer 1

不知道是否有帮助，但有 mvn dependency:tree 这给你一棵依赖罐树

https://maven.apache.org/plugins/maven-dependency-plugin/examples/resolving-conflicts-using-the-dependency-tree.html

Answer 2

提供 -verbose 作为编译器插件的参数。

你可以交叉检查maven文档here

            <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
                    <configuration>
                        <compilerArgs>
                            <arg>-verbose</arg>

                    </compilerArgs>
             </configuration>
        </plugin>

输出将打印在控制台中。您可以使用 mvn clean install --log-file log.txt 将其重定向到文件编写解析器以从日志中提取所需的信息。示例输出：

loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.8.0_101\lib\ct.sym(META-INF/sym/rt.jar/java/lang/Object.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.8.0_101\lib\ct.sym(META-INF/sym/rt.jar/java/util/logging/Level.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.8.0_101\lib\ct.sym(META-INF/sym/rt.jar/java/util/logging/Logger.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.8.0_101\lib\ct.sym(META-INF/sym/rt.jar/java/lang/String.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.8.0_101\lib\ct.sym(META-INF/sym/rt.jar/java/io/UnsupportedEncodingException.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.8.0_101\lib\ct.sym(META-INF/sym/rt.jar/java/net/URLDecoder.class)]]
[loading ZipFileIndexFileObject[C:\m2_repo\javax\ws\rs\javax.ws.rs-api.0\javax.ws.rs-api-2.0.jar(javax/ws/rs/core/Response.class)]]
[loading ZipFileIndexFileObject[C:\m2_repo\javax\ws\rs\javax.ws.rs-api.0\javax.ws.rs-api-2.0.jar(javax/ws/rs/ext/ExceptionMapper.class)]]
[loading ZipFileIndexFileObject[C:\m2_repo\javax\ws\rs\javax.ws.rs-api.0\javax.ws.rs-api-2.0.jar(javax/ws/rs/ext/Provider.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.8.0_101\lib\ct.sym(META-INF/sym/rt.jar/java/lang/RuntimeException.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.8.0_101\lib\ct.sym(META-INF/sym/rt.jar/java/util/HashSet.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.8.0_101\lib\ct.sym(META-INF/sym/rt.jar/java/util/Set.class)]]
[loading ZipFileIndexFileObject[C:\m2_repo\javax\ws\rs\javax.ws.rs-api.0\javax.ws.rs-api-2.0.jar(javax/ws/rs/ApplicationPath.class)]]
[loading ZipFileIndexFileObject[C:\m2_repo\javax\ws\rs\javax.ws.rs-api.0\javax.ws.rs-api-2.0.jar(javax/ws/rs/core/Application.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.8.0_101\lib\ct.sym(META-INF/sym/rt.jar/java/lang/Class.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.8.0_101\lib\ct.sym(META-INF/sym/rt.jar/java/util/ArrayList.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.8.0_101\lib\ct.sym(META-INF/sym/rt.jar/java/util/Collection.class)]]
[loading ZipFileIndexFileObject[C:\m2_repo\javax\annotation\javax.annotation-api.2\javax.annotation-api-1.2.jar(javax/annotation/security/RolesAllowed.class)]]
[loading ZipFileIndexFileObject[C:\m2_repo\javax\ws\rs\javax.ws.rs-api.0\javax.ws.rs-api-2.0.jar(javax/ws/rs/GET.class)]]
[loading ZipFileIndexFileObject[C:\m2_repo\javax\ws\rs\javax.ws.rs-api.0\javax.ws.rs-api-2.0.jar(javax/ws/rs/Path.class)]]
[loading ZipFileIndexFileObject[C:\m2_repo\javax\ws\rs\javax.ws.rs-api.0\javax.ws.rs-api-2.0.jar(javax/ws/rs/Produces.class)]]
[loading ZipFileIndexFileObject[C:\m2_repo\javax\ws\rs\javax.ws.rs-api.0\javax.ws.rs-api-2.0.jar(javax/ws/rs/QueryParam.class)]]
[loading ZipFileIndexFileObject[C:\m2_repo\javax\ws\rs\javax.ws.rs-api.0\javax.ws.rs-api-2.0.jar(javax/ws/rs/core/Context.class)]]
[loading ZipFileIndexFileObject[C:\m2_repo\javax\ws\rs\javax.ws.rs-api.0\javax.ws.rs-api-2.0.jar(javax/ws/rs/core/MediaType.class)]]
[loading ZipFileIndexFileObject[C:\m2_repo\javax\ws\rs\javax.ws.rs-api.0\javax.ws.rs-api-2.0.jar(javax/ws/rs/core/SecurityContext.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.8.0_101\lib\ct.sym(META-INF/sym/rt.jar/java/lang/Exception.class)]]

Answer 3

如果您想永久配置您的项目以打印 class 加载，那么接受的答案是好的。但是，您也可以使用 MAVEN_OPTS 环境变量添加 -verbose 标志作为一次性解决方案，如下所示：

MAVEN_OPTS="-verbose" mvn compile

在 windows 你可以像下面那样做： set MAVEN_OPTS="-verbose" 然后运行 mvn 命令

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