Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/Layout
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.
java -jar dist/pmml_export.jar
java -cp ".:log4j-1.2.16.jar" -jar dist/pmml_export.jar
java -cp log4j-1.2.16.jar -jar dist/pmml_export.jar
I doubled checked to see if Layout was in the jar I'm referencing and it is there. I'm 开发者_JAVA百科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 build.xml
.
<?xml version="1.0"?>
<project name="pmml_export" default="archive">
<target name="init">
<mkdir dir="build/classes" />
<mkdir dir="dist" />
</target>
<path id="compile.classpath">
<fileset dir="build/classes" includes="*.class" />
</path>
<property name="ant.dir" value="apache-log4j-1.2.16"/>
<path id="classpath">
<fileset dir="${ant.dir}" includes="**/*.jar"/>
</path>
<target name="exceptions" depends="init">
<javac srcdir="src/exceptions" destdir="build/classes" classpathref="compile.classpath"/>
<echo> Exceptions compiled! </echo>
</target>
<target name="symbol-table" depends="exceptions" >
<javac srcdir="src/translator/symbol_table" destdir="build/classes" classpathref="compile.classpath"/>
<echo> Symbol table compiled! </echo>
</target>
<target name="parser" depends="symbol-table" >
<javac srcdir="src/translator/parser" destdir="build/classes" classpathref="compile.classpath"/>
<echo> Parser compiled! </echo>
</target>
<target name="lexer" depends="parser" >
<javac srcdir="src/translator/lexer" destdir="build/classes" classpathref="compile.classpath"/>
<echo> Lexer compiled! </echo>
</target>
<target name="translator" depends="lexer" >
<javac srcdir="src/translator" destdir="build/classes" classpathref="compile.classpath"/>
<echo> Translator compiled! </echo>
</target>
<target name="exporter" depends="translator" >
<javac srcdir="src/pmml_export" destdir="build/classes" classpathref="compile.classpath" />
<echo> Exporter compiled! </echo>
</target>
<target name="archive" depends="exporter" >
<property name="manifest.mf" location="dist/manifest.txt" />
<manifest file="${manifest.mf}" >
<attribute name="Main-Class" value="pmml_export.PMML_Export"/>
</manifest>
<jar destfile="dist/pmml_export.jar" manifest="${manifest.mf}"
basedir="build/classes" />
</target>
<target name="run" depends="archive">
<java jar="dist/pmml_exporter.jar" fork="true">
<classpath>
<path refid="classpath"/>
<path location="dist/pmml_exporter.jar"/>
</classpath>
</java>
</target>
</project>
When you use the -jar
option, the -cp
and -classpath
options are ignored. The proper way to embed the classpath with the -jar
option is to set a Class-Path directive in the jar's MANIFEST.MF
file.
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