我写学校的在Java项目(离散仿真库),当我运行示例应用程序我仍然得到这个错误:错误的类路径?为什么我仍然得到NoClassDefFoundError?
[java] Exception in thread "main" java.lang.NoClassDefFoundError: /home/lut/Plocha/IMS/examples/Random/random/RandomTest
[java] Caused by: java.lang.ClassNotFoundException: .home.lut.Plocha.IMS.examples.Random.random.RandomTest
[java] at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
...
[java] at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
[java] Could not find the main class: /home/lut/Plocha/IMS/examples/Random/random.RandomTest. Program will exit.
[java] Java Result: 1
(/家/ LUT/Plocha/IMS是根目录在这里的文件树中,它被标记为 - 点)
我在根目录中有库。还有目录examples
,其中是使用此库的小型示例应用程序,每个应用程序都有它自己的构建ant脚本。
的目录结构:
.
├── build.xml <-- library build-file, examples are not included in this build
├── doc
├── examples
│ ├── Random
│ │ ├── build.xml <-- example app buil-file
│ │ └── src
│ │ └── random
│ │ └── RandomTest.java <-- main class of the example
│ └── Calendar
│ ├── build.xml, src, etc. inside
│ ...
├── dest <-- after library build, dsim.jar is here
├── build
└── src <-- source files of the library
└── ims
├── Distribution
│ └── RandomGenerator.java
├── Exception
│ ├── RandomException.java
│ └── SimulationException.java
└── SimObjects
├── Entity.java
├── Event.java
├── Facility.java
...
我可以建立两个主库(输出dsim.jar
在./dest
文件夹),例如应用程序(在./examples/Random
)没有问题,但是当我再尝试运行的例子应用程序(ant run
),我仍然收到NoClassDefFoundError
。
该示例应用的build.xml
(在./examples/Random
)看起来是这样的:
<?xml version="1.0" encoding="UTF-8"?>
<project name="Example - Random generator" default="compile" basedir=".">
<property name="src" location="src"/>
<property name="build" location="build"/>
<property name="dest" location="dest"/>
<property name="dsim.dir" location="../../dest"/>
<property name="dest.jar" location="${dest}/random.jar"/>
<property name="main-class" location="random.RandomTest"/>
<path id="dsim-classpath">
<fileset dir="${dsim.dir}">
<include name="*.jar"/>
</fileset>
</path>
<target name="prepare" description="Create necesery directories">
<mkdir dir="${build}"/>
<mkdir dir="${dest}"/>
</target>
<target name="compile" depends="prepare">
<javac srcdir="${src}" destdir="${build}" encoding="utf8">
<classpath refid="dsim-classpath"/>
</javac>
<jar destfile="${dest.jar}" basedir="${build}">
<manifest>
<attribute name="Main-Class" value="${main-class}"/>
</manifest>
</jar>
</target>
<target name="run" depends="compile">
<java jar="${dest.jar}" fork="true" classpathref="dsim-classpath"/>
</target>
</project>
RandomTest.java文件,行开头:关于类路径
package random;
import ims.Distribution.RandomGenerator;
import ims.Exception.SimulationException;
import ims.SimObjects.Histogram;
public class RandomTest {
public static void main(String[] args) throws SimulationException {
我试着在谷歌搜索,有几个职位和它的问题,但即使我无法确定哪里可能是问题。我究竟做错了什么?我想念什么?
非常感谢。
提示:用`jar xf jarfile`提取你的jar并检查META-INF/manifest.mf。它在主流中说什么? – extraneon 2010-12-04 22:24:49
Main-Class:/home/lut/Plocha/IMS/examples/Random/random.RandomTest -/home/lut/Plocha/IMS是根目录(在文件树中标记为。 - dot) – Martin 2010-12-04 22:37:55