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Question

我想将picocli与jline3一起使用。因此，我使用以下pom.xml创建一个项目：

<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>com.flaxel</groupId>
<artifactId>picocli_test</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>picocli</name>
<url>http://maven.apache.org</url>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

    <maven.compiler.source>11</maven.compiler.source>
    <maven.compiler.target>11</maven.compiler.target>

    <picocli.version>3.9.3</picocli.version>
    <jline.version>3.9.0</jline.version>
</properties>

<dependencies>
    <dependency>
        <groupId>info.picocli</groupId>
        <artifactId>picocli</artifactId>
        <version>${picocli.version}</version>
    </dependency>
    <dependency>
        <groupId>info.picocli</groupId>
        <artifactId>picocli-shell-jline3</artifactId>
        <version>${picocli.version}</version>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <version>3.0.2</version>
            <configuration>
                <archive>
                    <manifest>
                        <mainClass>com.flaxel.picocli.App</mainClass>
                    </manifest>
                </archive>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compile-plugin</artifactId>
            <version>3.7.0</version>
        </plugin>
    </plugins>
</build>

现在，我从picocli github page复制了一个课程：

package com.flaxel.picocli;

import java.io.IOException;
import java.io.PrintWriter;
import java.nio.charset.Charset;
import java.util.concurrent.Callable;
import java.util.concurrent.TimeUnit;

import org.jline.reader.EndOfFileException;
import org.jline.reader.LineReader;
import org.jline.reader.LineReaderBuilder;
import org.jline.reader.MaskingCallback;
import org.jline.reader.ParsedLine;
import org.jline.reader.UserInterruptException;
import org.jline.reader.impl.DefaultParser;
import org.jline.reader.impl.LineReaderImpl;
import org.jline.terminal.Terminal;
import org.jline.terminal.TerminalBuilder;

import picocli.CommandLine;
import picocli.CommandLine.Command;
import picocli.CommandLine.Option;
import picocli.CommandLine.ParentCommand;
import picocli.shell.jline3.PicocliJLineCompleter;

/**
 * Example that demonstrates how to build an interactive shell with JLine3 and
 * picocli.
 * 
 * @since 3.9
 */
public class App {

    /**
     * Top-level command that just prints help.
     */
    @Command(name = "", description = "Example interactive shell with completion", footer = { "",
        "Press Ctl-D to exit." }, subcommands = { MyCommand.class, ClearScreen.class })
    static class CliCommands implements Runnable {
        LineReaderImpl reader;
        PrintWriter out;

        CliCommands() {
        }

        public void setReader(LineReader reader) {
            this.reader = (LineReaderImpl) reader;
            out = reader.getTerminal().writer();
        }

        @Override
        public void run() {
            out.println(new CommandLine(this).getUsageMessage());
        }
    }

    /**
     * A command with some options to demonstrate completion.
     */
    @Command(name = "cmd", mixinStandardHelpOptions = true, version = "1.0", description = "Command with some options to demonstrate TAB-completion"
            + " (note that enum values also get completed)")
    static class MyCommand implements Runnable {
        @Option(names = { "-v", "--verbose" })
        private boolean[] verbosity = {};

        @Option(names = { "-d", "--duration" })
        private int amount;

        @Option(names = { "-u", "--timeUnit" })
        private TimeUnit unit;

        @ParentCommand
        CliCommands parent;

        @Override
        public void run() {
            if (verbosity.length > 0) {
                parent.out.printf("Hi there. You asked for %d %s.%n", amount, unit);
            } else {
                parent.out.println("hi!");
            }
        }
    }

    /**
     * Command that clears the screen.
     */
    @Command(name = "cls", aliases = "clear", mixinStandardHelpOptions = true, description = "Clears the screen", version = "1.0")
    static class ClearScreen implements Callable<Void> {

        @ParentCommand
        CliCommands parent;

        @Override
        public Void call() throws IOException {
            parent.reader.clearScreen();
            return null;
        }
    }

    public static void main(String[] args) {
        try {
            // set up the completion
            CliCommands commands = new CliCommands();
            CommandLine cmd = new CommandLine(commands);
            Terminal terminal = TerminalBuilder.builder().build();
            LineReader reader = LineReaderBuilder.builder()
                    .terminal(terminal)
                    .completer(new PicocliJLineCompleter(cmd.getCommandSpec()))
                    .parser(new DefaultParser())
                    .build();
            commands.setReader(reader);
            String prompt = "prompt> ";
            String rightPrompt = null;

            // start the shell and process input until the user quits with Ctrl-D
            String line;
            while (true) {
                try {
                    line = reader.readLine(prompt, rightPrompt, (MaskingCallback) null, null);
                    ParsedLine pl = reader.getParser().parse(line, 0);
                    String[] arguments = pl.words().toArray(new String[0]);
                    CommandLine.run(commands, arguments);
                } catch (UserInterruptException e) {
                    // Ignore
                } catch (EndOfFileException e) {
                    return;
                }
            }
        } catch (Throwable t) {
            t.printStackTrace();
        }
    }
}

如果我在Eclipse IDE中运行代码，则可以在控制台中编写命令，然后得到答案。但是，如果我使用Maven创建一个jar文件，它将无法正常工作。我收到以下错误：

错误：无法初始化主类com.flaxel.picocli.App 由以下原因引起：java.lang.NoClassDefFoundError：org / jline / reader / UserInterruptException

我使用Eclipse 2018-09和Java11。

Answer 1

对我有用的完美。我使用了Maven Shade插件并添加了一些属性，因此得到了以下pom.xml：

<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>com.flaxel</groupId>
    <artifactId>picocli_test</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>picocli</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>

        <picocli.version>3.9.3</picocli.version>
        <jline.version>3.9.0</jline.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>info.picocli</groupId>
            <artifactId>picocli</artifactId>
            <version>${picocli.version}</version>
        </dependency>
        <dependency>
            <groupId>info.picocli</groupId>
            <artifactId>picocli-shell-jline3</artifactId>
            <version>${picocli.version}</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <configuration>
                    <archive>
                        <manifest>
                            <mainClass>com.flaxel.picocli.App</mainClass>
                            <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compile-plugin</artifactId>
                <version>3.7.0</version>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>2.3</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <createDependencyReducedPom>false</createDependencyReducedPom>
                            <shadedArtifactAttached>true</shadedArtifactAttached>
                            <shadedClassifierName>jar-with-dependencies</shadedClassifierName>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

编辑

我至少有一个问题。如果我启动该应用程序并想使用制表符补全，则无法使用。所以我没有完成，只设置了四个空格：

二月。 2019年7月7日50:29 NACHM。 org.jline.utils.Log记录器   警告：无法创建系统终端，创建哑终端（启用调试日志以获取更多信息）

提示> cmd

还是我有什么问题？

Answer 2

发生NoClassDefFoundError是因为在运行jar时缺少JLine类。尝试使用shade Maven插件创建一个包含所有依赖项的Uber罐。

在Windows上的JLine 3中，您可能希望除了添加org.jline:jline-terminal-jansi:3.9.0之外还添加info.picoli:picocli-shell-jline3:3.9.3依赖项。没有这个（或jline-terminal-jna依赖），您将获得一个“哑”终端，没有ANSI颜色或自动补全。

（{info.picoli:picocli-shell-jline3:3.9.3将引入info.picocli:picocli和org.jline:jline作为传递依赖，因此无需显式包括这些。）

picocli无法与cmd.exe中的jline3一起使用

2 个答案:

编辑