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POException in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/Layout
 

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    <p>I'm trying to build an application using ant. Everything appears to be fine when I build but I continually get the above error for what I've tried so far.</p> <ul> <li><code>java -jar dist/pmml_export.jar</code></li> <li><code>java -cp ".:log4j-1.2.16.jar" -jar dist/pmml_export.jar</code></li> <li><code>java -cp log4j-1.2.16.jar -jar dist/pmml_export.jar</code></li> </ul> <p>I doubled checked to see if Layout was in the jar I'm referencing and it is there. I'm fairly new to both ant and log4j so I could be making an obvious mistake but I'm just not seeing it. Here is my <code>build.xml</code>.</p> <pre><code>&lt;?xml version="1.0"?&gt; &lt;project name="pmml_export" default="archive"&gt; &lt;target name="init"&gt; &lt;mkdir dir="build/classes" /&gt; &lt;mkdir dir="dist" /&gt; &lt;/target&gt; &lt;path id="compile.classpath"&gt; &lt;fileset dir="build/classes" includes="*.class" /&gt; &lt;/path&gt; &lt;property name="ant.dir" value="apache-log4j-1.2.16"/&gt; &lt;path id="classpath"&gt; &lt;fileset dir="${ant.dir}" includes="**/*.jar"/&gt; &lt;/path&gt; &lt;target name="exceptions" depends="init"&gt; &lt;javac srcdir="src/exceptions" destdir="build/classes" classpathref="compile.classpath"/&gt; &lt;echo&gt; Exceptions compiled! &lt;/echo&gt; &lt;/target&gt; &lt;target name="symbol-table" depends="exceptions" &gt; &lt;javac srcdir="src/translator/symbol_table" destdir="build/classes" classpathref="compile.classpath"/&gt; &lt;echo&gt; Symbol table compiled! &lt;/echo&gt; &lt;/target&gt; &lt;target name="parser" depends="symbol-table" &gt; &lt;javac srcdir="src/translator/parser" destdir="build/classes" classpathref="compile.classpath"/&gt; &lt;echo&gt; Parser compiled! &lt;/echo&gt; &lt;/target&gt; &lt;target name="lexer" depends="parser" &gt; &lt;javac srcdir="src/translator/lexer" destdir="build/classes" classpathref="compile.classpath"/&gt; &lt;echo&gt; Lexer compiled! &lt;/echo&gt; &lt;/target&gt; &lt;target name="translator" depends="lexer" &gt; &lt;javac srcdir="src/translator" destdir="build/classes" classpathref="compile.classpath"/&gt; &lt;echo&gt; Translator compiled! &lt;/echo&gt; &lt;/target&gt; &lt;target name="exporter" depends="translator" &gt; &lt;javac srcdir="src/pmml_export" destdir="build/classes" classpathref="compile.classpath" /&gt; &lt;echo&gt; Exporter compiled! &lt;/echo&gt; &lt;/target&gt; &lt;target name="archive" depends="exporter" &gt; &lt;property name="manifest.mf" location="dist/manifest.txt" /&gt; &lt;manifest file="${manifest.mf}" &gt; &lt;attribute name="Main-Class" value="pmml_export.PMML_Export"/&gt; &lt;/manifest&gt; &lt;jar destfile="dist/pmml_export.jar" manifest="${manifest.mf}" basedir="build/classes" /&gt; &lt;/target&gt; &lt;target name="run" depends="archive"&gt; &lt;java jar="dist/pmml_exporter.jar" fork="true"&gt; &lt;classpath&gt; &lt;path refid="classpath"/&gt; &lt;path location="dist/pmml_exporter.jar"/&gt; &lt;/classpath&gt; &lt;/java&gt; &lt;/target&gt; &lt;/project&gt; </code></pre>
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    1. COThe `-cp` argument is **ignored** when using the `-jar` argument. You need to tell Ant to specify the classpath as `Class-Path` entry of JAR's `/META-INF/MANIFEST.MF` file.
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    2. COWhat OS? On Windows -cp a.jar;b.jar
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    3. CO@Op De Cirkel: The OS is Ubuntu 10.04 and I'm running it on a VM Player. The host OS is Windows Vista.
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