java - 在 Maven 程序集中包含共享对象

Question

我目前正在尝试使用 maven 和 sqlite4java 构建我的项目。可以在官方 maven 存储库中找到。google code 上的官方sqlite4java 页面确实有一个示例配置，但它有点过时了，不适合我的需要。我想最后有一个 .jar 文件，我可以在其他地方部署。这里的问题是共享对象依赖。我正在使用他们页面上的官方构建目标将 so 复制到 build.dir/lib 但我的装配目标崩溃：

[INFO] Failed to create assembly: Error adding file-set for 'com.almworks.sqlite4java:libsqlite4java-linux-i386:so:0.282' to archive: Error adding archived file-set. PlexusIoResourceCollection not found for: /home/lhw/.m2/repository/com/almworks/sqlite4java/libsqlite4java-linux-i386/0.282/libsqlite4java-linux-i386-0.282.so
No such archiver: 'so'.

​我做错了什么？这是我当前的 pom.xml 从一些与本主题无关的依赖项中剥离出来的

<?xml version="1.0"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>de.ring0.lhw</groupId>
  <artifactId>system</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <dependencies>
    <dependency>
      <groupId>com.almworks.sqlite4java</groupId>
      <artifactId>sqlite4java</artifactId>
      <version>${sqlite4java.version}</version>
    </dependency>
    <dependency>
      <groupId>com.almworks.sqlite4java</groupId>
      <artifactId>libsqlite4java-linux-i386</artifactId>
      <version>${sqlite4java.version}</version>
      <type>so</type>
    </dependency>
  </dependencies>
  <properties>
    <sqlite4java.version>0.282</sqlite4java.version>
  </properties>
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-dependency-plugin</artifactId>
        <executions>
          <execution>
            <id>copy</id>
            <phase>compile</phase>
            <goals>
              <goal>copy</goal>
            </goals>
            <configuration>
              <artifactItems>
                <artifactItem>
                  <groupId>com.almworks.sqlite4java</groupId>
                  <artifactId>libsqlite4java-linux-i386</artifactId>
                  <version>${sqlite4java.version}</version>
                  <type>so</type>
                  <overWrite>true</overWrite>
                  <outputDirectory>${project.build.directory}/lib</outputDirectory>
                </artifactItem>
              </artifactItems>
            </configuration>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>2.5.1</version>
        <configuration>
          <source>1.6</source>
          <target>1.6</target>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-surefire-plugin</artifactId>
        <version>2.12.2</version>
        <configuration>
          <skipTests>true</skipTests>
          <systemProperties>
            <property>
              <name>sqlite4java.library.path</name>
              <value>${project.build.directory}/lib</value>
            </property>
          </systemProperties>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-assembly-plugin</artifactId>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>single</goal>
            </goals>
            <configuration>
              <archive>
                <manifest>
                  <mainClass>de.ring0.lhw.Init</mainClass>
                </manifest>
              </archive>
              <descriptorRefs>
                <descriptorRef>jar-with-dependencies</descriptorRef>
              </descriptorRefs>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>

Answer 1

编辑 ：

我认为 jar-with-dependencies 程序集描述符试图解包依赖项。

见链接：

http://maven.apache.org/plugins/maven-assembly-plugin/descriptor-refs.html

maven.apache.org/plugins/maven-assembly-plugin/... ...

<unpack>true</unpack>

当然，它无法解压 .so

因此，您可能必须使用自定义程序集来执行您想做的事情

Answer 2

可以使用库存的“jar-with-dependencies”程序集描述符创建可执行 jar，而无需使用任何启动 shell/批处理脚本。但是，它需要不涉及太多 Maven 配置的肮脏变通方法。

1. 我们需要将所有本机库（包含在 sqlite4java zip 下载中）放置到src/main/resources目录。还要从 Maven POM 文件中删除 sqlite4java 本机库依赖项。
2. 因为 sqlite4java 的本地库加载器不查看您的类路径或 JAR 文件内部，所以您必须在启动时提取本地库，并在运行时设置“sqlite4java.library.path”系统属性。请看以下示例代码：

/** List of native libraries you put in src/main/resources */
public static final String[] NATIVE_LIB_FILENAMES = {
    "libsqlite4java-linux-amd64.so",
    "libsqlite4java-linux-i386.so",
    "libsqlite4java-osx.jnilib",
    "libsqlite4java-osx-10.4.jnilib",
    "libsqlite4java-osx-ppc.jnilib",
    "sqlite4java-win32-x64.dll",
    "sqlite4java-win32-x86.dll",
};

/**
 * Extract native libraries to the current directory.
 * This example needs Apache Commons IO (https://commons.apache.org/proper/commons-io/)
 */
public static void extractNativeResources() {
    for(String filename: NATIVE_LIB_FILENAMES) {
        // Change "DemoSQLite2" to your class name
        final InputStream in = DemoSQLite2.class.getResourceAsStream("/"+filename);

        if(in != null) {
            try {
                System.out.println("Extracting " + filename);
                FileUtils.copyInputStreamToFile(in, new File(filename));
            } catch (IOException e) {
                System.err.println("Can't extract " + filename);
                e.printStackTrace();
            }
        }
    }
}

/**
 * Delete native libraries in the current directory
 */
public static void removeNativeResources() {
    for(String filename: NATIVE_LIB_FILENAMES) {
        File file = new File(filename);
        file.delete();
    }
}

public static void main(String[] args) throws Exception {
    boolean deleteNativesOnExit = false;    // Delete natives on exit

    // Extract native libraries if sqlite4java.library.path property is not set
    String sqlitePath = System.getProperty("sqlite4java.library.path");
    if(sqlitePath == null) {
        System.setProperty("sqlite4java.library.path", "."); // Read natives from current directory
        extractNativeResources();
        deleteNativesOnExit = true;
    }

    // Do SQLite jobs here
    final SQLiteConnection db = new SQLiteConnection(new File("test.db"));
    try {
        db.open();
        db.dispose();
        System.out.println("Success");
    } catch (Exception e) {
        e.printStackTrace();
        System.err.println("FAILED");
    }

    // Delete the native libraries we extracted
    if(deleteNativesOnExit) removeNativeResources();
}

现在您的应用程序应该可以使用标准的“jar-with-dependencies”描述符构建，并且您的应用程序可以使用标准的“java -jar your_jar.jar”命令运行。

当然，如果 sqlite4java 以后有更新，你必须手动更新资源目录中的原生库。

如果您有更好、更少脏的解决方案，请告诉我！