我正在关注Ant tutorial并为log4j.But编写了一个简单的程序，当我尝试通过命令行运行JAR时，我无法这样做。
现在我甚至猜不出是什么问题。
关于JAR （LoggingTestApp.jar）
META-INF - ＆gt; MANIFEST.MF
pack - ＆gt; Mainn.class
log4j.properties
MANIFEST.MF
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.7.1
Created-By: 19.1-b02 (Sun Microsystems Inc.)
Main-Class: pack.Mainn
pack.Mainn class
package pack;
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Logger;
public class Mainn {
public Mainn() {
super();
}
String className = this.getClass().getName();
void logTest() {
Logger log = Logger.getLogger(className);
System.out.println("Logging started");
log.debug(this.className + "Hello this is an debug message");
log.info(this.className + "Hello this is an info message");
}
public static void main(String[] args) {
System.out.println("Main started");
Mainn a = new Mainn();
a.logTest();
}
}
Ant构建脚本
<?xml version="1.0" encoding="UTF-8" ?>
<project name="LoggingTestApp" basedir="." default="main">
<property name="src.dir" value="src"/>
<property name="lib.dir" value="lib"/>
<property name="build.dir" value="build"/>
<property name="classes.dir" value="${build.dir}/classes"/>
<property name="jar.dir" value="${build.dir}/jar"/>
<property name="main-class" value="pack.Mainn"/>
<path id="classpath">
<fileset dir="${lib.dir}" includes="**/*.jar"/>
</path>
<target name="clean">
<delete dir="${build.dir}"/>
</target>
<target name="compile">
<mkdir dir="${classes.dir}"/>
<javac srcdir="${src.dir}" destdir="${classes.dir}" classpathref="classpath"/>
<copy todir="${classes.dir}">
<fileset dir="${src.dir}" excludes="**/*.java"/>
</copy>
</target>
<target name="jar" depends="compile">
<mkdir dir="${jar.dir}"/>
<jar destfile="${jar.dir}/${ant.project.name}.jar" basedir="${classes.dir}">
<manifest>
<attribute name="Main-Class" value="${main-class}"/>
</manifest>
</jar>
</target>
<target name="run" depends="jar">
<java fork="true" classname="${main-class}">
<classpath>
<path refid="classpath"/>
<path location="${jar.dir}/${ant.project.name}.jar"/>
</classpath>
</java>
</target>
<target name="clean-build" depends="clean,jar"/>
<target name="main" depends="clean,run"/>
</project>
最初未找到Mainn类的一些错误，但我可以通过查找来处理它。
现在有一件事我无法做到。我尝试了以下命令来运行它，但由于类路径存在一些问题。
直接投放
java -jar ./LoggingTestApp.jar
Main started
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/Logger
at pack.Mainn.logTest(Unknown Source)
at pack.Mainn.main(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Logger
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 2 more
我抬起头，发现用jar作为classpath的一部分运行解决了每个人的问题。当我运行以下命令时，没有出现错误，但日志没有更新。
java -cp I:\Study\Codes\_JDeveloper\LoggingTestApp\Client\lib\log4j1.2.13.jar;.\LoggingTestApp.jar pack.Mainn
没有错误，只是
Usage: java [-options] class [args...]
(to execute a class)
or java [-options] -jar jarfile [args...]
(to execute a jar file)
where options include:
-d32 use a 32-bit data model if available
-d64 use a 64-bit data model if available
-server to select the "server" VM
-hotspot is a synonym for the "server" VM [deprecated]
The default VM is server.
-cp <class search path of directories and zip/jar files>
-classpath <class search path of directories and zip/jar files>
A ; separated list of directories, JAR archives,
and ZIP archives to search for class files.
-D<name>=<value>
set a system property
-verbose:[class|gc|jni]
enable verbose output
-version print product version and exit
-version:<value>
require the specified version to run
-showversion print product version and continue
-jre-restrict-search | -no-jre-restrict-search
include/exclude user private JREs in the version search
-? -help print this help message
-X print help on non-standard options
-ea[:<packagename>...|:<classname>]
-enableassertions[:<packagename>...|:<classname>]
enable assertions with specified granularity
-da[:<packagename>...|:<classname>]
-disableassertions[:<packagename>...|:<classname>]
disable assertions with specified granularity
-esa | -enablesystemassertions
enable system assertions
-dsa | -disablesystemassertions
disable system assertions
-agentlib:<libname>[=<options>]
load native agent library <libname>, e.g. -agentlib:hprof
see also, -agentlib:jdwp=help and -agentlib:hprof=help
-agentpath:<pathname>[=<options>]
load native agent library by full pathname
-javaagent:<jarpath>[=<options>]
load Java programming language agent, see java.lang.instrument
-splash:<imagepath>
show splash screen with specified image
See http://www.oracle.com/technetwork/java/javase/documentation/index.html for more details.
现在我不知道该找什么。没有错误，但使用命令行来运行JAR根本不起作用。
答案 0 :(得分：1)
尝试将log4j库与JAR文件一起打包
<target name="jar" depends="compile">
<mkdir dir="${jar.dir}"/>
<jar destfile="${jar.dir}/${ant.project.name}.jar" basedir="${classes.dir}" filesetmanifest="mergewithoutmain">
<manifest>
<attribute name="Main-Class" value="${main-class}"/>
<attribute name="Class-Path" value="."/>
</manifest>
<zipfileset excludes="META-INF/*.SF" src="I:/Study/Codes/_JDeveloper/LoggingTestApp/Client/lib/log4j1.2.13.jar"/>
</jar>
</target>