java.lang.NoClassDefFoundError:org/apache/commons/cli/ParseException

Question

我想在我的应用程序中添加apache cli,但是我有问题.当我尝试运行它时会显示这些错误:

Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/cli/ParseException
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
    at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
    at java.lang.Class.getMethod0(Class.java:3018)
    at java.lang.Class.getMethod(Class.java:1784)
    at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.cli.ParseException
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 7 more

这是我的代码:

CommandLineParser parser = new PosixParser();
Options options = new Options();
options.addOption("a", "abc", true, "First parameter");

try {
    CommandLine commandLine = parser.parse(options, args);
    System.out.println(commandLine.getOptionValue("a"));
} catch (ParseException e1) {
    e1.printStackTrace();
}

我还在pom.xml中添加了这个:

<dependency>
    <groupId>commons-cli</groupId>
    <artifactId>commons-cli</artifactId>
    <version>1.2</version>
</dependency>

但它没有帮助:/我还首先手动添加了commons-cli-1.3.1.jar和后来的commons-cli-1.2.jar,但两者都无济于事.

@编辑

PS.我将它作为"java -jar filename.jar"运行.

Answer 1

经过几分钟的更改，我就能执行以下代码：

    CommandLineParser parser = new PosixParser();
    Options options = new Options();
    options.addOption("a", true, "First parameter"); 
    args=new String[]{"-a abc"};

    try {
        CommandLine commandLine = parser.parse(options, args );    
        System.out.println(commandLine.getOptionValue("a"));
    } catch (ParseException e1) {
        e1.printStackTrace();
    }


Output :-  abc

在我的pom.xml中：-

  <dependency>
    <groupId>commons-cli</groupId>
    <artifactId>commons-cli</artifactId>
    <version>1.2</version>
  </dependency>

commons-cli-1.2.jar对您的代码不可见。

Answer 2

尝试在类路径中列出您正在使用的所有 jar：

java -classpath lib/*.jar:other/location/lib/*jar:. my.package.Program

您必须告诉 java 使用哪些库来运行代码。